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Contents
- The climate of Alajuela
- The best time to visit Alajuela
- The worst time to visit Alajuela
- Spring weather in Alajuela
- Summer weather in Alajuela
- Autumn weather in Alajuela
- Winter weather in Alajuela
- 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
Climate and monthly weather forecast
The climate of Alajuela
Alajuela belongs to the Köppen climate classification category of Am, which describes a Tropical monsoon climate. This city, located in Costa Rica, enjoys warm temperature averages from 15.2°C (59.4°F) to 28°C (82.4°F) throughout the year. However, noticeable fluctuations in certain weather parameters occur as the seasons transition.
The gateway to an expansive understanding of the weather conditions in Alajuela is the relative humidity. It ranges from 71% to 90%, giving an indication of consistent high moisture levels in the air. An additional factor, playing a significant role in the city’s weather, is rainfall which varies from 25mm (0.98") to a significant 421mm (16.57"). This considerable range of values offers an indicator of varying precipitation levels throughout the twelve-month cycle.
Sunshine hours play an intriguing role in Alajuela’s climate. They remain fairly constant, ranging from 6.2 hours to 9.1 hours per day. However, the number of sunshine days sees a wider gap, from fewer than one day in the mid-year months to over eleven days from the onset of the year. On the contrary, daylight hours throughout the year remain somewhat consistent, varying from 11.5 hours to 12.7 hours.
A swift transition from moderate to heavy rainfall outlines Alajuela’s unique weather patterns. Between February to April, rainfall is comparatively moderate with a maximum quantity of 96mm (3.78"). Dramatically, May sees a sudden surge in rainfall, marking the onset of downpours for almost half the year, with downpours intensely going up to 352mm (13.86").
The gateway to an expansive understanding of the weather conditions in Alajuela is the relative humidity. It ranges from 71% to 90%, giving an indication of consistent high moisture levels in the air. An additional factor, playing a significant role in the city’s weather, is rainfall which varies from 25mm (0.98") to a significant 421mm (16.57"). This considerable range of values offers an indicator of varying precipitation levels throughout the twelve-month cycle.
Sunshine hours play an intriguing role in Alajuela’s climate. They remain fairly constant, ranging from 6.2 hours to 9.1 hours per day. However, the number of sunshine days sees a wider gap, from fewer than one day in the mid-year months to over eleven days from the onset of the year. On the contrary, daylight hours throughout the year remain somewhat consistent, varying from 11.5 hours to 12.7 hours.
A swift transition from moderate to heavy rainfall outlines Alajuela’s unique weather patterns. Between February to April, rainfall is comparatively moderate with a maximum quantity of 96mm (3.78"). Dramatically, May sees a sudden surge in rainfall, marking the onset of downpours for almost half the year, with downpours intensely going up to 352mm (13.86").
The best time to visit Alajuela
Costa Rica takes pride in the "Goldilocks" season - not too hot, not too cold - just right. In Alajuela, this period extends from December to April. With average temperatures remaining a warm 24.5°C (76.1°F) to 28°C (82.4°F), visitors can indulge in numerous outdoor activities. Alongside the hospitable climate, this period also sees limited rainfall, ranging from 25mm (0.98") to 96mm (3.78"). The months of January and February feature the most sunshine days, paired with modest humidity percentages.
The worst time to visit Alajuela
The consideration of a less favourable period to visit Alajuela settles around the months of May to November. Otherwise known as the "Green Season", the city takes on heavy rainfall, reaching up to 421mm (16.57") in October. The heavy downpours and a spike in humidity to almost 90%, might pose a hindrance for certain sightseeing plans. The sunshine days are also at their lowest, making outdoor plans less alluring.
Spring weather in Alajuela
In Alajuela, spring extends from March to May. During this period, temperatures remain warm, averaging between 24.8°C (76.6°F) and 28°C (82.4°F). However, an intriguing note in Alajuela's weather pattern is the significant rise in rainfall in May, reaching 352mm (13.86") compared to a modest 30mm (1.18") in March. This phenomenon marks the shift from Alajuela's dry to the wet phase.
Summer weather in Alajuela
Looking at the Alajuela's summer weather from June to August, warm temperatures are a constant companion ranging between 24.8°C (76.6°F) and 24.9°C (76.8°F). Unlike most regions, this period in Alajulea is characterised by increased cloud coverage and heavy rainfall, reaching a high of 371mm (14.61") in June. Although peak summer, the city receives the least sunshine days, making it an unusual summer experience.
Autumn weather in Alajuela
Autumn in Alajuela, from September to November follows the pattern set by summer. It witnesses maintained warm temperatures from 23.8°C (74.8°F) to 24.5°C (76.1°F). Despite the change in season, heavy rainfall is a continuity with quantities escalating to 421mm (16.57") in October. Sunshine days remain limited, however, a gradual increase is noted towards November.
Winter weather in Alajuela
Winter months from December to February in Alajuela are quite pleasant with temperatures staying between 15.2°C (59.4°F) to 17.5°C (63.5°F). Contrary to the standard winter characteristics, Alajuela enjoys an increase in sunshine days and hours during this season. Rainfall tends to be the least, making it an inviting season for travellers. Despite being winter, the climate leans towards warmth, setting a new tone for winter experience.
Weather in January
Transitioning from the slightly cooler climate of December, January in Alajuela, Costa Rica boasts promising dry and warm weather conditions. A slight upturn in temperature markers signifies the onset of more pleasant climatic conditions. Weather in January »
Weather in February
February in Alajuela, Costa Rica, experiences a relatively similar climate pattern as January, apart from a few minor shifts in parameter averages. A negligible hike in temperature differentiates it from the preceding month, yet these conditions enrich the overall appeal of the city's tropical climate. Weather in February »
Weather in March
The climatic parameters of March in Alajuela, Costa Rica, align with those of February, although a few subtle changes do occur. An increase in low temperatures points towards slightly warmer nights. March signifies consistency in Alajuela's tropical weather, with longer daylight hours setting the stage for more sunshine duration. Weather in March »
Weather in April
Alajuela, Costa Rica, sees a significant transformation in weather as April rolls around. The climb in maximum and minimum temperatures hand in hand with the increased rainfall, signals the curtain drop on the dry season. Despite the rainfall, which totals 96mm (3.78") in around 21.7 days, the city sees longer daylight and higher UV indexes. Weather in April »
Weather in May
May, in Alajuela, Costa Rica, stands out with its highest rainfall levels of the year - hefty precipitation totals of 352mm (13.86") spread over nearly an entire month. This meteorological change has the effect of a drop in the UV index and a decrease in visibility. Weather in May »
Weather in June
The weather of June in Alajuela, Costa Rica, remains consistent with the established pattern, carrying forward most of the meteorological markers from May. Slight variations in maximum and minimum temperatures hint at a cooler month. Weather in June »
Weather in July
July in Alajuela, Costa Rica, continues the trend of rain-soaked months. A reduction in both temperature extremes paints a cooler picture for this month. However, the frequency of rainfall takes a slight rise to 29.3 days, with a cumulative rainfall amount reducing to around 291mm (11.46"). Weather in July »
Weather in August
The climate of Alajuela, Costa Rica, stays on a relatively steady course in August. The statistics for maximum and minimum temperatures do not exhibit much of a swing from July's figures. A slight dip in daylight hours and a constant UV Index point to a persistence of the rainy season. Weather in August »
Weather in September
September, in Alajuela, Costa Rica, experiences daily high and low temperatures similar to the earlier months, while embracing other changes in weather parameters. Daylight hours are on a gradual decline while the cloud cover is denser resulting in fewer sunshine hours. Weather in September »
Weather in October
October in Alajuela, Costa Rica, faces a continuation of the weather patterns witnessed in September, albeit with some noteworthy deviations. A further decline in temperatures, as well as in daylight hours, coincide with the progression of the year. Weather in October »
Weather in November
An easing up from the saturated conditions of October is evident in November's weather landscape in Alajuela, Costa Rica. A subtle rise in temperatures parallels the transition into drier seasons. Although rainfall recedes considerably to approximately 169mm (6.65") over nearly 28.2 days, cloud cover keeps the sky relatively shrouded. Weather in November »
Weather in December
December in Alajuela, Costa Rica, marks a significant shift towards the drier and cooler season. The average maximum temperature increases slightly, while the minimum temperature drops, mirroring the onset of winter in tropical Alajuela. Weather in December »
Updated: Aug 2, 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 many days does it rain?
In Alajuela, during the entire year, the rain falls for 289.5 days and collects up to 2506mm (98.66") of precipitation.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, May through December, with an average maximum UV index of 5.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 12.3 days and typically collects 25mm (0.98") of precipitation.
What month has the most sunshine?
February has the most sunshine of the year, with an average of 9.4h of sunshine.
What is the least humid month?
March is the least humid month, with an average relative humidity of 71%.
What is the month with the highest UV index?
The months with the highest UV index are March and April, with an average maximum UV index of 6.
What time of the year is the hottest?
In Alajuela, Costa Rica, the average temperatures in April are the highest, with a peak at 28°C (82.4°F) and a low of 17.5°C (63.5°F).
When are the longest days?
June has the longest days of the year, with an average of 12h and 42min of daylight.
What is the coldest time of year?
October, known for its average high temperature of 23.8°C (74.8°F) and an average low temperature of 17.5°C (63.5°F), is the coldest month in Alajuela.
What is the most humid month?
October is the most humid month, with an average relative humidity of 90%.
What is the wettest month?
October is the month with the most rainfall. Rain falls for 30.5 days and accumulates 421mm (16.57") of precipitation.
What is the month with the least sunshine?
With an average of 6.2h of sunshine, October has the least sunshine of the year.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 11h and 30min of daylight.
Is there Daylight Saving Time (DST)?
Alajuela does not observe Daylight Saving Time (DST). CST timezone is used throughout the entire year.
Average temperature
Alajuela, Costa Rica
The warmest month (with the highest average high temperature) is April (28°C).
The month with the lowest average high temperature is October (23.8°C).
The month with the highest average low temperature is May (18.3°C).
The coldest month (with the lowest average low temperature) is January (15.2°C).
Average pressure
Alajuela, Costa Rica
- Average pressure in January:
1012.2mbar - Average pressure in February:
1011.9mbar - Average pressure in March:
1012mbar - Average pressure in April:
1011.4mbar - Average pressure in May:
1011.1mbar - Average pressure in June:
1011.1mbar
- Average pressure in July:
1011.4mbar - Average pressure in August:
1011.3mbar - Average pressure in September:
1011mbar - Average pressure in October:
1010.8mbar - Average pressure in November:
1011mbar - Average pressure in December:
1011.6mbar
The month with the highest atmospheric pressure is January (1012.2mbar).
The month with the lowest atmospheric pressure is October (1010.8mbar).
Average wind speed
Alajuela, Costa Rica
- Average wind speed in January:
10.7km/h - Average wind speed in February:
10.9km/h - Average wind speed in March:
9.7km/h - Average wind speed in April:
6.9km/h - Average wind speed in May:
4.9km/h - Average wind speed in June:
4.7km/h
- Average wind speed in July:
6.4km/h - Average wind speed in August:
5km/h - Average wind speed in September:
3.9km/h - Average wind speed in October:
4.2km/h - Average wind speed in November:
6.4km/h - Average wind speed in December:
9km/h
The windiest month (with the highest average wind speed) is February (10.9km/h).
The calmest month (with the lowest average wind speed) is September (3.9km/h).
Average humidity
Alajuela, Costa Rica
The month with the highest relative humidity is October (90%).
The month with the lowest relative humidity is March (71%).
Average rainfall
Alajuela, Costa Rica
- Average rainfall in January:
32mm - Average rainfall in February:
25mm - Average rainfall in March:
30mm - Average rainfall in April:
96mm - Average rainfall in May:
352mm - Average rainfall in June:
371mm
- Average rainfall in July:
291mm - Average rainfall in August:
336mm - Average rainfall in September:
321mm - Average rainfall in October:
421mm - Average rainfall in November:
169mm - Average rainfall in December:
62mm
The wettest month (with the highest rainfall) is October (421mm).
The driest month (with the least rainfall) is February (25mm).
Average rainfall days
Alajuela, Costa Rica
- Average rainfall days in January:
14.8 days - Average rainfall days in February:
12.3 days - Average rainfall days in March:
16.5 days - Average rainfall days in April:
21.7 days - Average rainfall days in May:
28.3 days - Average rainfall days in June:
28.8 days
- Average rainfall days in July:
29.3 days - Average rainfall days in August:
28.8 days - Average rainfall days in September:
29.3 days - Average rainfall days in October:
30.5 days - Average rainfall days in November:
28.2 days - Average rainfall days in December:
21 days
The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (12.3 days).
Average daylight / Average sunshine
Alajuela, Costa Rica
- Average daylight in January:
11h and 4min - Average daylight in February:
11h and 5min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 4min - Average daylight in June:
12h and 4min
- Average daylight in July:
12h and 4min - Average daylight in August:
12h and 3min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 5min - Average daylight in November:
11h and 4min - Average daylight in December:
11h and 3min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).
- Average sunshine in January:
8h and 5min - Average sunshine in February:
9h and 2min - Average sunshine in March:
9h and 1min - Average sunshine in April:
8h and 5min - Average sunshine in May:
7h and 2min - Average sunshine in June:
6h and 5min
- Average sunshine in July:
7h and 5min - Average sunshine in August:
7h and 1min - Average sunshine in September:
7h and 0min - Average sunshine in October:
6h and 1min - Average sunshine in November:
6h and 5min - Average sunshine in December:
8h and 2min
The month with the most sunshine is February (Average sunshine: 9h and 24min).
The month with the least sunshine is October (Average sunshine: 6h and 12min).
Average sunshine days
Alajuela, Costa Rica
- Average sunshine days in January:
11.4 days - Average sunshine days in February:
11.9 days - Average sunshine days in March:
10.2 days - Average sunshine days in April:
5.9 days - Average sunshine days in May:
1.9 days - Average sunshine days in June:
0.6 days
- Average sunshine days in July:
0.8 days - Average sunshine days in August:
0.9 days - Average sunshine days in September:
0.4 days - Average sunshine days in October:
0.5 days - Average sunshine days in November:
1.4 days - Average sunshine days in December:
6.5 days
The month with the most sunshine days is February (11.9 days).
The month with the least sunshine days is September (0.4 days).
Average UV index
Alajuela, Costa Rica
The months with the highest UV index are March and April (UV index 6).
The months with the lowest UV index are January, February, May, June, July, August, September, October, November and December (UV index 5).
Average cloud cover
Alajuela, Costa Rica
The month with the most cloud cover is October (Cloud cover 62).
The month with the least cloud cover is February (Cloud cover 23).
Average visibility
Alajuela, Costa Rica
The months with the highest visibility are January, February, March and April (9km).
The months with the lowest visibility are September and October (6km).
