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Contents
- The climate of San Marcos
- The best time to visit San Marcos
- The worst time to visit San Marcos
- Spring weather in San Marcos
- Summer weather in San Marcos
- Autumn weather in San Marcos
- Winter weather in San Marcos
- 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 San Marcos
San Marcos in El Salvador is governed by a Tropical wet and dry or savanna climate, identified by the Köppen climate classification as "Aw". Being positioned in the tropics results in year-round warm temperatures, with minimal variation across seasons. Variability, however, manifests more significantly in the distribution of rainfall throughout the year.
The region maintains average high temperatures above 29°C (84.2°F) every month, peaking at 33.4°C (92.1°F) in both March and April. The year-round warmth is balanced by the lower night-time temperatures, which dip to 19°C (66.2°F) in January, gradually rise to 22.6°C (72.7°F) by May, and subsequently hover around 21°C (69.8°F) for the remainder of the year. Rainfall patterns show a stark contrast between the dry and wet seasons. The driest months are January and February, receiving only 2mm (0.08") and 7mm (0.28") of rainfall correspondingly, followed by a steady rise in rainfall from March to October, the rainiest month being May with 267mm (10.51"). Relative humidity also follows this trend, increasing from 64% in January to a peak of 82% in September and October.
Although the region enjoys ample daylight throughout the year, with a minimum of 11.3 hours in December and a peak of 12.9 hours in June, the amount of sunshine varies. The highest sunshine hours are observed in April, recording 11.3 hours per day, while the minimum is in October with 8.3 hours. Wind speeds remain fairly low throughout the year. The annual average pressure remains steady, ranging from 1011.3mb to 1013.6mb.
The region maintains average high temperatures above 29°C (84.2°F) every month, peaking at 33.4°C (92.1°F) in both March and April. The year-round warmth is balanced by the lower night-time temperatures, which dip to 19°C (66.2°F) in January, gradually rise to 22.6°C (72.7°F) by May, and subsequently hover around 21°C (69.8°F) for the remainder of the year. Rainfall patterns show a stark contrast between the dry and wet seasons. The driest months are January and February, receiving only 2mm (0.08") and 7mm (0.28") of rainfall correspondingly, followed by a steady rise in rainfall from March to October, the rainiest month being May with 267mm (10.51"). Relative humidity also follows this trend, increasing from 64% in January to a peak of 82% in September and October.
Although the region enjoys ample daylight throughout the year, with a minimum of 11.3 hours in December and a peak of 12.9 hours in June, the amount of sunshine varies. The highest sunshine hours are observed in April, recording 11.3 hours per day, while the minimum is in October with 8.3 hours. Wind speeds remain fairly low throughout the year. The annual average pressure remains steady, ranging from 1011.3mb to 1013.6mb.
The best time to visit San Marcos
The best time to visit San Marcos largely depends on personal preferences. For those who prefer warm and dry conditions, January and February offer the lowest amount of rainfall, with readings only up to 7mm (0.28"), along with the lowest relative humidity of 64%. However, the likelihood of maximum sunshine hours, higher daylight hours, and slightly cooler temperatures might make March and April a more attractive choice for some.
The worst time to visit San Marcos
Preferably, the period between May and October should be avoided due to the high volume of rainfall, peaking at 267mm (10.51") in May. This period also experiences the year's highest levels of humidity, between 76% to 82%. Furthermore, the diminished sunshine hours, particularly in September and October, make these months less favorable for outdoor activities.
Spring weather in San Marcos
Spring months bring a surge in temperatures in San Marcos. From February to April, the average high temperature rises from 32.4°C (90.3°F) to 33.4°C (92.1°F). However, nighttime temperatures remain comfortable, increasing from 20°C (68°F) in February to 22.5°C (72.5°F) in April. Although March witnesses an increase in rainfall compared to February, the volume remains relatively low at 6mm (0.24"). Sunshine hours increase during this period, with April recording 11.3 hours of sunshine per day, the highest throughout the year.
Summer weather in San Marcos
Summers in San Marcos, extending from May to July, mark the onset of the wet season. Rainfall climbs significantly, reaching a high of 267mm (10.51") in May and decreases slightly thereafter. Amid these conditions, temperatures maintain their warmth, with highs from 31.8°C (89.2°F) to 31.9°C (89.4°F) and lows from 22.6°C (72.7°F) to 21.3°C (70.3°F). Despite the high level of rainfall, the area still enjoys a considerable amount of sunshine, with an average of 10.7 hours in May and 10.4 hours in June.
Autumn weather in San Marcos
The autumn months of August to October in San Marcos continue with excessive rainfall, although the volume slightly decreases from the summer months, with October recording 223mm (8.78"). The period is characterized by a high relative humidity level, reaching 82% in September and October. Simultaneously, the average high temperature reduces from 31.6°C (88.9°F) in August to 29.7°C (85.5°F) in October, while the average minimum temperature remains steady around 21°C (69.8°F).
Winter weather in San Marcos
The winter months from November to January present a respite from the wet conditions, with rainfall dropping to 42mm (1.65") in November and further to 6mm (0.24") in January. The reduction in rainfall corresponds with a decrease in relative humidity to 75% in November and 69% in December. Notwithstanding the term 'winter', temperatures remain warm with average highs from 30.3°C (86.5°F) to 30.8°C (87.4°F) and lows from 19.5°C (67.1°F) to 19°C (66.2°F).
Weather in January
Beginning the year, San Marcos, El Salvador sees a shift in weather conditions from the chilly season of December. January exhibits clear skies with only 13% cloud cover, offering brilliant sunshine for an approximate seven hours. Weather in January »
Weather in February
Moving into February, San Marcos experiences a slight rise in temperature compared to January. February brings a pleasant mix of sun and clouds, presenting an excellent opportunity for outdoor activities. The city faces an increased downpour with an average of 7mm (0.28") of rainfall spread across almost four days. Weather in February »
Weather in March
March carries similar weather patterns to February, while showing a slight increase in temperature and rainfall. The warm days of March coupled with an average UV index of 7 may require wearing sunblock for those spending extended periods outdoors. Weather in March »
Weather in April
April tags along with increased rainfall and warmer temperatures compared to its preceding month, March. It is during this month that the wet season sets in, indicated by a considerable jump in rain from 6mm (0.24") in March to 53mm (2.09"). Weather in April »
Weather in May
May presents a dramatic increase in rainfall to 267mm (10.51"); a significant upsurge from 53mm (2.09") experienced in April. This heavy rain, covering over 26 days, coupled with decreased sunshine hours, is a clear sign of the peak wet season. Weather in May »
Weather in June
Weather dynamics in June exhibit a slight moderation compared to May. While the month maintains the momentum of the wet season with 179mm (7.05") rainfall across 26 days, this is less than the previous record of 267mm (10.51"). Even so, this rainfall is substantial, and cloud cover of 39% persists. Weather in June »
Weather in July
Intensifying a notch lower, July emulates June, yet with a slightly lower rainfall of 120mm (4.72") spread over about 24 days. It's worth noting that the consistency of rain in July implies the enduring wet season. Subsequently, the humidity decreases marginally and the temperature sustains a similar range as June. Weather in July »
Weather in August
August follows the consistent rainfall trend seen in July with a slight increase in the rainfall to 161mm (6.34") over nearly 25 days. The weather remains quite warm, similar to what July has to offer. Despite the consistent rain, average daylight hours of approximately 12.6 hours provide considerable time for daily activities. Weather in August »
Weather in September
September marks a peak in cloud cover with 41%, somewhat reducing the sunlight hours during the day. Meanwhile, the month holds on to the wet season pattern, with 150mm (5.91") of rainfall across approximately 26 days. Equal energy balancing through wind is less operational as wind speed drops to an average value of 4.5 KPH. Weather in September »
Weather in October
In October, San Marcos experiences the peak of the wet season with the highest level of rainfall at 223mm (8.78") over roughly 24 days. Comparatively, temperature ranges remain consistent with the previous month but a notable drop begins. Weather in October »
Weather in November
November introduces a noticeable shift in weather conditions as rainfall significantly drops to 42mm (1.65") over approximately 13 days. The city witnesses a reduction in cloud cover, signifying the end of the wet season and the beginning of the drier months. Weather in November »
Weather in December
Arriving at the final month of the year, December embraces the cooler and drier season with an average low temperature of 19.1°C (66.4°F). December records the lowest rainfall of the year at 6mm (0.24") over nearly three days, indicating the complete shift to the dry season. Weather in December »
Updated: Jan 30, 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
What is the driest month in San Marcos?
The month with the least rainfall is January, when the rain falls for 2.3 days and typically collects 2mm (0.08") of precipitation.
How many days does it rain in San Marcos?
In San Marcos, El Salvador, during the entire year, the rain falls for 196.7 days and collects up to 1216mm (47.87") of precipitation.
What is the month with the least sunshine in San Marcos?
The months with the least sunshine in San Marcos are January and December, with an average of 7.7h of sunshine.
What are the months with the highest UV index in San Marcos?
The months with the highest UV index in San Marcos, El Salvador, are January through April, with an average maximum UV index of 7.
What time of the year is the hottest in San Marcos?
The warmest period is usually observed in March and April, with the average high-temperature peaking at 33.4°C (92.1°F).
What is the least humid month in San Marcos?
With an average relative humidity of 61%, March is the least humid month in San Marcos, El Salvador.
What month has the most sunshine in San Marcos?
April has the most sunshine of the year, with an average of 11.3h of sunshine.
What is the rainiest month in San Marcos?
May is the month with the most rainfall in San Marcos. Rain falls for 26.9 days and accumulates 267mm (10.51") of precipitation.
When is the lowest UV index in San Marcos?
The months with the lowest UV index in San Marcos are May through December, with an average maximum UV index of 6.
When are the longest days in San Marcos?
With an average of 12h and 54min of daylight, June has the longest days of the year in San Marcos.
What is the most humid month in San Marcos?
September and October, with an average relative humidity of 82%, are most humid months in San Marcos, El Salvador.
What month is the coldest in San Marcos?
In San Marcos, October is the month with the lowest recorded average temperatures, measuring a high of 29.7°C (85.5°F) and a low of 20.5°C (68.9°F).
What is the month with the shortest days in San Marcos?
With an average of 11h and 18min of daylight, December has the shortest days of the year.
Is there Daylight Saving Time (DST) in San Marcos?
San Marcos does not observe Daylight Saving Time (DST). CST timezone is used throughout the entire year.
Average temperature
San Marcos, El Salvador
The warmest months (with the highest average high temperature) are March and April (33.4°C).
The month with the lowest average high temperature is October (29.7°C).
The month with the highest average low temperature is May (22.6°C).
The coldest month (with the lowest average low temperature) is January (19°C).
Average pressure
San Marcos, El Salvador
- Average pressure in January:
1013.6mbar - Average pressure in February:
1012.9mbar - Average pressure in March:
1012.6mbar - Average pressure in April:
1011.6mbar - Average pressure in May:
1011.3mbar - Average pressure in June:
1011.6mbar
- Average pressure in July:
1012.3mbar - Average pressure in August:
1011.9mbar - Average pressure in September:
1011.5mbar - Average pressure in October:
1011.3mbar - Average pressure in November:
1012.3mbar - Average pressure in December:
1013mbar
The month with the highest atmospheric pressure is January (1013.6mbar).
The months with the lowest atmospheric pressure are May and October (1011.3mbar).
Average wind speed
San Marcos, El Salvador
- Average wind speed in January:
8km/h - Average wind speed in February:
6.9km/h - Average wind speed in March:
6.6km/h - Average wind speed in April:
5.4km/h - Average wind speed in May:
4.7km/h - Average wind speed in June:
4.4km/h
- Average wind speed in July:
5km/h - Average wind speed in August:
4.7km/h - Average wind speed in September:
4.5km/h - Average wind speed in October:
5km/h - Average wind speed in November:
6.7km/h - Average wind speed in December:
7.3km/h
The windiest month (with the highest average wind speed) is January (8km/h).
The calmest month (with the lowest average wind speed) is June (4.4km/h).
Average humidity
San Marcos, El Salvador
The months with the highest relative humidity are September and October (82%).
The month with the lowest relative humidity is March (61%).
Average rainfall
San Marcos, El Salvador
The wettest month (with the highest rainfall) is May (267mm).
The driest month (with the least rainfall) is January (2mm).
Average rainfall days
San Marcos, El Salvador
- Average rainfall days in January:
2.3 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
26.9 days - Average rainfall days in June:
26.2 days
- Average rainfall days in July:
23.8 days - Average rainfall days in August:
24.6 days - Average rainfall days in September:
26.5 days - Average rainfall days in October:
23.9 days - Average rainfall days in November:
12.8 days - Average rainfall days in December:
2.8 days
The month with the highest number of rainy days is May (26.9 days).
The month with the least rainy days is January (2.3 days).
Average daylight / Average sunshine
San Marcos, El Salvador
- Average daylight in January:
11h and 2min - Average daylight in February:
11h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 5min - Average daylight in June:
12h and 5min
- Average daylight in July:
12h and 5min - Average daylight in August:
12h and 4min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 5min - Average daylight in November:
11h and 3min - Average daylight in December:
11h and 2min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).
- Average sunshine in January:
7h and 4min - Average sunshine in February:
9h and 0min - Average sunshine in March:
10h and 3min - Average sunshine in April:
11h and 2min - Average sunshine in May:
10h and 4min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
11h and 1min - Average sunshine in August:
10h and 5min - Average sunshine in September:
9h and 0min - Average sunshine in October:
8h and 2min - Average sunshine in November:
8h and 5min - Average sunshine in December:
7h and 4min
The month with the most sunshine is April (Average sunshine: 11h and 18min).
The months with the least sunshine are January and December (Average sunshine: 7h and 42min).
Average sunshine days
San Marcos, El Salvador
- Average sunshine days in January:
27.7 days - Average sunshine days in February:
23 days - Average sunshine days in March:
22.3 days - Average sunshine days in April:
11.1 days - Average sunshine days in May:
2.7 days - Average sunshine days in June:
2.8 days
- Average sunshine days in July:
5.3 days - Average sunshine days in August:
5.4 days - Average sunshine days in September:
2.5 days - Average sunshine days in October:
5.5 days - Average sunshine days in November:
15.9 days - Average sunshine days in December:
27.1 days
The month with the most sunshine days is January (27.7 days).
The month with the least sunshine days is September (2.5 days).
Average UV index
San Marcos, El Salvador
The months with the highest UV index are January, February, March and April (UV index 7).
The months with the lowest UV index are May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover
San Marcos, El Salvador
The month with the most cloud cover is September (Cloud cover 41).
The month with the least cloud cover is January (Cloud cover 13).
Average visibility
San Marcos, El Salvador
The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are June, August, September and October (8km).
San Marcos, El Salvador
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