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Contents
- The climate of Porto Alegre
- The best time to visit Porto Alegre
- The worst time to visit Porto Alegre
- Spring weather in Porto Alegre
- Summer weather in Porto Alegre
- Autumn weather in Porto Alegre
- Winter weather in Porto Alegre
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Porto Alegre
Located in the tropical nation of São Tomé and Príncipe, Porto Alegre experiences a Tropical Wet and Dry climate, classified as 'As' under the Köppen climate system. Geographically, nestled on the island's southwestern coast, it enjoys a maritime influence, contributing to the climatic characteristics.
Through the twelve months, the temperatures maintain a tropical range, with average highs oscillating from 24.5°C (76.1°F) to 28.8°C (83.8°F) and average lows remaining steady from 23°C (73.4°F) to 27.5°C (81.5°F). The fluctuation is moderate, demonstrating a typical tropical climate pattern. Relative humidity levels are notable as they stay above 76%, with a peak at 83%, reflecting the tropical nature of the climate zone.
An interesting feature of Porto Alegre's is its rainfall patterns. There's a visible shift from high levels of rainfall, peaking at 224mm (8.82") in November, to a discernible dry spell with the least amount of rainfall, 9mm (0.35"), observed in July. The number of rainfall days shows a similar contrast, peaking at 28.6 days in December and reaching a low of 7.3 days in June. This distinct dry season corresponds with the 'As' climate classification.
Unsurprisingly, considering its tropical location, sunlight availability remains nearly constant throughout the year at an average of 12.1 hours per day. However, actual sunshine hours vary from 5 hours in August to 8.6 hours in February, revealing a period of increased cloud cover during the latter half of the year, as confirmed by cloud percentage data. Wind speeds show a slight increase towards the middle of the year, with a maximum average of 17.7km/h (11mph) in July.
Through the twelve months, the temperatures maintain a tropical range, with average highs oscillating from 24.5°C (76.1°F) to 28.8°C (83.8°F) and average lows remaining steady from 23°C (73.4°F) to 27.5°C (81.5°F). The fluctuation is moderate, demonstrating a typical tropical climate pattern. Relative humidity levels are notable as they stay above 76%, with a peak at 83%, reflecting the tropical nature of the climate zone.
An interesting feature of Porto Alegre's is its rainfall patterns. There's a visible shift from high levels of rainfall, peaking at 224mm (8.82") in November, to a discernible dry spell with the least amount of rainfall, 9mm (0.35"), observed in July. The number of rainfall days shows a similar contrast, peaking at 28.6 days in December and reaching a low of 7.3 days in June. This distinct dry season corresponds with the 'As' climate classification.
Unsurprisingly, considering its tropical location, sunlight availability remains nearly constant throughout the year at an average of 12.1 hours per day. However, actual sunshine hours vary from 5 hours in August to 8.6 hours in February, revealing a period of increased cloud cover during the latter half of the year, as confirmed by cloud percentage data. Wind speeds show a slight increase towards the middle of the year, with a maximum average of 17.7km/h (11mph) in July.
The best time to visit Porto Alegre
Taking into consideration the climatological data, the best time to visit Porto Alegre is arguably from April to June. During this period, the area experiences lower rainfall, ranging from 100mm (3.94") to 22mm (0.87"), fewer rainy days, and lower humidity levels of 77% to 81%. While temperatures remain warm, with average highs ranging from 28.6°C (83.5°F) to 25.6°C (78.1°F). This period offers relatively drier and comfortable weather conditions ideal for outdoor activities and exploration.
The worst time to visit Porto Alegre
The least favorable time to visit Porto Alegre is from October to December. These months coincides with the city's rainiest period, when rainfall levels peak between 220mm (8.66") and 224mm (8.82"), and the number of rainy days ranges from 24.7 to a maximum of 28.6. Temperatures remain high, and humidity levels rise up to 83%. These conditions not only increase discomfort but also may disrupt outdoor activities.
Spring weather in Porto Alegre
In Porto Alegre, the spring months from September to November experience a significant rise in rainfall, with levels increasing from 35mm (1.38") to 224mm (8.82"). The number of rainy days begins to increase from 15.8 to 26.7 and humidity increases up to 83%. Although the temperatures remain consistent, ranging from the high 25.5°C (77.9°F) to 27.1°C (80.8°F) and lows from 24.6°C (76.3°F) to 26.2°C (79.2°F), the increased rainfall and cloud cover during this time may detract from an otherwise pleasant season.
Summer weather in Porto Alegre
The summer months from December to February in Porto Alegre are wet, with high rainfall amounts from 130mm (5.12") to 159mm (6.26"). Despite the rainfall, average high temperatures remain at a tropical range from 28°C (82.4°F) to 28.4°C (83.1°F), with lows from 27°C (80.6°F) to 27.3°C (81.1°F). The number of daylight hours stays consistent at 12.1 hours. However, increased cloud cover reduces the amount of actual sunshine hours.
Autumn weather in Porto Alegre
During the autumn months from March to May, Porto Alegre experiences a steady decrease in rainfall from 126mm (4.96") to 22mm (0.87"), and the number of rainy days decreases from 22 to 7.3. This period also sees a gradual decrease in temperatures, with average highs descending from 28.8°C (83.8°F) to 25.6°C (78.1°F), and lows decreasing from 27.5°C (81.5°F) to 24.3°C (75.7°F).
Winter weather in Porto Alegre
Winter in Porto Alegre, encompassing June to August, is the driest period of the year. Rainfall amounts plummet to lows of 9mm (0.35") in July and climb slightly to 21mm (0.83") in August. Temperatures are the year's lowest with highs floating from 24.5°C (76.1°F) to 24.8°C (76.6°F) and lows from 23°C (73.4°F) to 23.2°C (73.8°F). These conditions, combined with the significantly lower number of rainfall days, make this perhaps the driest season, typical of the 'As' Tropical Savanna classification.
Weather in January
In Porto Alegre, the weather in January begins with a blend of warmth and humidity. Daily temperatures typically reach up to 28°C (82.4°F). The city experiences an average of 77% relative humidity. Intermittent rainfall is frequent this month, contributing to the overall damp conditions. Weather in January »
Weather in February
Moving into February, the weather retains much of January's characteristics though with slight changes. The warmth still prevails, but the city witnesses a slight increase in both maximum and minimum temperatures. Notable is the slight reduction in rainfall, from 130mm (5.12") in January to 100mm (3.94"). Weather in February »
Weather in March
As Porto Alegre transitions further into the year, March brings minor changes in the weather pattern. Interests focus on the increase in rainfall which rises to 119mm (4.69"). Humid conditions persist even though the maximum and minimum temperatures remain steady. Weather in March »
Weather in April
In April, the city witnesses a subtle shift towards cooler weather. This is evident as the maximum temperature drops slightly to 28.6°C (83.5°F). However, the relative humidity persists at 77%, and the rainfall increases slightly to 126mm (4.96"). Weather in April »
Weather in May
The weather in May in Porto Alegre sees the commencement of the city's gentle slide towards winter. A notable change is the discernible fall in temperature, which drops to a maximum of 27.8°C (82°F). Cloud coverage increases in correlation with humidity, resulting in lesser periods of sunshine and increasingly cooler days. Weather in May »
Weather in June
June is distinct for a marked decrease in rainfall as the precipitation comes down to 22mm (0.87"). The temperature drops further, signifying the onset of winter in Porto Alegre. The drop in temperature and reduced rainfall attract fewer tourists, rendering the city tranquil. Weather in June »
Weather in July
By July, Porto Alegre has settled into winter. The maximum temperature hovers around 24.5°C (76.1°F). This is the city's driest month, with rainfall measuring only 9mm (0.35"). The city waits in quiet slumber, its usual vibrancy muted under the winter chill. Weather in July »
Weather in August
The weather in August in Porto Alegre is quite consistent with that of July, showing a slight increase in average temperatures and rainfall. The city remains in the grip of winter, though hints of spring are starting to emerge. The overall climate remains comfortably cool, making this an opportune time for visitors seeking a tranquil vacation. Weather in August »
Weather in September
By September, spring begins to make its presence felt in Porto Alegre. Though the rainfall increases to 35mm (1.38"), the temperature experiences a mild increase, suggesting the onset of spring. The weather creates a delightful blend of sunshine and showers, soothing the remnants of winter's chill. Weather in September »
Weather in October
In October, Porto Alegre is quickly moving towards summer. The city faces a notable upsurge in rainfall, leaping from 35mm (1.38") in September to a whopping 220mm (8.66"). Flowering trees bloom in response to the showers and increased sunshine. Weather in October »
Weather in November
The pace of life in Porto Alegre picks up in November as the city readies for summer. Despite a slight decline in temperature, rainfall continues to be heavy, averaging around 224mm (8.82"). A fresh sense of vibrancy pervades the city, reflecting the excitement of the upcoming holiday season. Weather in November »
Weather in December
December signifies the full swing of summer in Porto Alegre with maximum temperatures around 27.5°C (81.5°F). However, rainfall reduces to 159mm (6.26") after the heavy showers of the previous two months. There is an air of joy and anticipation as the city prepares for Christmas and New Year celebrations. Weather in December »
Updated: Feb 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How much does it rain in Porto Alegre?
Throughout the year, in Porto Alegre, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.
When is the highest UV index in Porto Alegre?
The months with the highest UV index in Porto Alegre, São Tomé and Príncipe, are January through May, October through December, with an average maximum UV index of 7.
What month has the most sunshine in Porto Alegre?
February has the most sunshine of the year in Porto Alegre, with an average of 8.6h of sunshine.
What is the hottest time of year in Porto Alegre?
The month of March, characterized by an average high of 28.8°C (83.8°F) and a low of 27.5°C (81.5°F), is recognized as the warmest in Porto Alegre.
What is the least humid month in Porto Alegre?
March is the least humid month in Porto Alegre, with an average relative humidity of 76%.
What is the month with the shortest days in Porto Alegre?
March and September, with an average of 12h and 6min of daylight, are months with the shortest days.
When are the longest days in Porto Alegre?
June has the longest days of the year, with an average of 12h and 6min of daylight.
What are the coldest months in Porto Alegre?
July, known for its average high temperature of 24.5°C (76.1°F) and an average low temperature of 23°C (73.4°F), is the coldest month in Porto Alegre.
What is the driest month in Porto Alegre?
July is the month with the least rainfall in Porto Alegre, São Tomé and Príncipe. Rain falls for 8.4 days and accumulates 9mm (0.35") of precipitation.
What is the month with the lowest UV index in Porto Alegre?
With an average maximum UV index of 5, July is the month with the lowest UV index.
What is the most humid month in Porto Alegre?
August through October, with an average relative humidity of 83%, are most humid months in Porto Alegre, São Tomé and Príncipe.
What is the month with the least sunshine in Porto Alegre?
August has the least sunshine of the year, with an average of 5h of sunshine.
What is the wettest month in Porto Alegre?
The month with the most rainfall in Porto Alegre is November, when the rain falls for 26.7 days and typically aggregates up to 224mm (8.82") of precipitation.
Is there Daylight Saving Time (DST) in Porto Alegre?
Porto Alegre does not observe Daylight Saving Time (DST). GMT timezone is used throughout the entire year.
Average temperature
Porto Alegre, São Tomé and Príncipe
The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).
The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).
Average pressure
Porto Alegre, São Tomé and Príncipe
- Average pressure in January:
1010.7mbar - Average pressure in February:
1009.8mbar - Average pressure in March:
1009.9mbar - Average pressure in April:
1010.1mbar - Average pressure in May:
1011.3mbar - Average pressure in June:
1013.5mbar
- Average pressure in July:
1014.3mbar - Average pressure in August:
1014.1mbar - Average pressure in September:
1013.1mbar - Average pressure in October:
1011.4mbar - Average pressure in November:
1010.4mbar - Average pressure in December:
1010.6mbar
The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).
Average wind speed
Porto Alegre, São Tomé and Príncipe
- Average wind speed in January:
11.1km/h - Average wind speed in February:
11.6km/h - Average wind speed in March:
11.7km/h - Average wind speed in April:
10.9km/h - Average wind speed in May:
13km/h - Average wind speed in June:
17.6km/h
- Average wind speed in July:
17.7km/h - Average wind speed in August:
17.1km/h - Average wind speed in September:
16.8km/h - Average wind speed in October:
14.2km/h - Average wind speed in November:
12.3km/h - Average wind speed in December:
10.8km/h
The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).
Average humidity
Porto Alegre, São Tomé and Príncipe
The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).
Average rainfall
Porto Alegre, São Tomé and Príncipe
- Average rainfall in January:
130mm - Average rainfall in February:
100mm - Average rainfall in March:
119mm - Average rainfall in April:
126mm - Average rainfall in May:
122mm - Average rainfall in June:
22mm
The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).
Average rainfall days
Porto Alegre, São Tomé and Príncipe
- Average rainfall days in January:
27.1 days - Average rainfall days in February:
23.4 days - Average rainfall days in March:
24.4 days - Average rainfall days in April:
22 days - Average rainfall days in May:
20.5 days - Average rainfall days in June:
7.3 days
- Average rainfall days in July:
8.4 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
15.8 days - Average rainfall days in October:
24.7 days - Average rainfall days in November:
26.7 days - Average rainfall days in December:
28.6 days
The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).
Average daylight / Average sunshine
Porto Alegre, São Tomé and Príncipe
- Average daylight in January:
12h and 1min - Average daylight in February:
12h and 1min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 1min - Average daylight in May:
12h and 1min - Average daylight in June:
12h and 1min
- Average daylight in July:
12h and 1min - Average daylight in August:
12h and 1min - Average daylight in September:
12h and 1min - Average daylight in October:
12h and 1min - Average daylight in November:
12h and 1min - Average daylight in December:
12h and 1min
The month with the longest days is June (Average daylight: 12h and 6min).
The months with the shortest days are March and September (Average daylight: 12h and 6min).
- Average sunshine in January:
8h and 2min - Average sunshine in February:
8h and 4min - Average sunshine in March:
8h and 2min - Average sunshine in April:
8h and 1min - Average sunshine in May:
7h and 4min - Average sunshine in June:
6h and 2min
- Average sunshine in July:
6h and 0min - Average sunshine in August:
5h and 0min - Average sunshine in September:
5h and 2min - Average sunshine in October:
6h and 4min - Average sunshine in November:
7h and 0min - Average sunshine in December:
8h and 1min
The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).
Average sunshine days
Porto Alegre, São Tomé and Príncipe
- Average sunshine days in January:
3.1 days - Average sunshine days in February:
3.8 days - Average sunshine days in March:
5.3 days - Average sunshine days in April:
6.2 days - Average sunshine days in May:
9.2 days - Average sunshine days in June:
16.4 days
- Average sunshine days in July:
14.8 days - Average sunshine days in August:
8 days - Average sunshine days in September:
5.3 days - Average sunshine days in October:
2.7 days - Average sunshine days in November:
2 days - Average sunshine days in December:
1.5 days
The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).
Average UV index
Porto Alegre, São Tomé and Príncipe
The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).
Average cloud cover
Porto Alegre, São Tomé and Príncipe
The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).
Average visibility
Porto Alegre, São Tomé and Príncipe
The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).
Porto Alegre, São Tomé and Príncipe
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