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Contents
- The climate of Poás
- The best time to visit Poás
- The worst time to visit Poás
- Spring weather in Poás
- Summer weather in Poás
- Autumn weather in Poás
- Winter weather in Poás
- 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 Poás
Perched in the mountains of Costa Rica at a considerable altitude, Poás has a predominantly Tropical Monsoon climate according to the Köppen climate classification. Throughout the year, the climate sees variations in distinct parameters, such as temperature, humidity, rainfall, and daylight.
A consistent temperature range can be observed from month to month, with highs shifting between 25.4°C (77.7°F) and 29.7°C (85.5°F), and lows changing between 16.8°C (62.2°F) and 19.8°C (67.6°F). The hottest temperatures usually occur in March and April, whilst the coldest are in January and December. Relative humidity values range from 70% to 89%, with the drier months being February and March, and the most humid being September and October.
Poás enters its rainiest phase from May to October, with a staggering 249mm (9.8") to 396mm (15.59") of monthly average rainfall, contrasting sharply with drier periods from January to April, where rainfall averages between 17mm (0.67") and 86mm (3.39"). The region witnesses the maximum number of rainy days in October, peaking at 30.2 days. The presence of clouds varies, reaching their maximum coverage in October at 54% and their minimum in February at 19%.
A consistent temperature range can be observed from month to month, with highs shifting between 25.4°C (77.7°F) and 29.7°C (85.5°F), and lows changing between 16.8°C (62.2°F) and 19.8°C (67.6°F). The hottest temperatures usually occur in March and April, whilst the coldest are in January and December. Relative humidity values range from 70% to 89%, with the drier months being February and March, and the most humid being September and October.
Poás enters its rainiest phase from May to October, with a staggering 249mm (9.8") to 396mm (15.59") of monthly average rainfall, contrasting sharply with drier periods from January to April, where rainfall averages between 17mm (0.67") and 86mm (3.39"). The region witnesses the maximum number of rainy days in October, peaking at 30.2 days. The presence of clouds varies, reaching their maximum coverage in October at 54% and their minimum in February at 19%.
The best time to visit Poás
The optimal period to visit Poás falls between January and April. The region experiences milder temperatures, generous sunshine hours from 9.1 hours to 9.4 hours, relatively lower humidity and minimal rain during these periods. With fewer rainy days and maximum sunshine, February proves to be especially enjoyable. Furthermore, visibility peaks at 10km (6.2mi), enabling unhindered views of the stunning mountainous landscape.
The worst time to visit Poás
Travel to Poás might prove challenging between May and October, when dramatic weather changes usher in the monsoon season. Increasing humidity, coupled with frequent and abundant rainfall, may hamper outdoor activities. Especially in September and October, visitors will face up to 30 rainy days and monthly average rainfall reaching 396mm (15.59"), with cloud cover obscuring the view and dampening the brightness of the surroundings.
Spring weather in Poás
In Poás, the spring months of March, April, and May introduce minor weather fluctuations. Temperatures peak in March and April at 29.7°C (85.5°F), and decrease to 27.7°C (81.9°F) in May. Spring sees a rise in rainfall from 21mm (0.83") in March to a heavy 339mm (13.35") in May, a period where humidity begins to climb, reaching 82% by the month's end.
Summer weather in Poás
June marks the commencement of summer. The temperature declines slightly, hovering between 26.3°C (79.3°F) and 27.7°C (81.9°F) over the summer which lasts till August. The humidity peaks during this period at 87%. Rainfall is copious at this time, exceeding 323mm (12.72"), and the number of rainy days piles up to a maximum of 28.3 days in July.
Autumn weather in Poás
Autumn, which extends from September to November, is characterized by further drop in temperature to 25.4°C (77.7°F) in October, while humidity nudges higher. The rainfall volume soars, reaching its peak at 396mm (15.59") in October, and the number of rainy days increases to a high of 30.2 days. This season sees minimal sunshine with a low of 0.5 sunshine days in September.
Winter weather in Poás
Winter, from December to February, sees a reversal of the harsh conditions experienced earlier. Pleasant weather, with temperatures ranging from 16.8°C (62.2°F) to 28.3°C (82.9°F), accompanies a significant drop in rainfall, reducing to as low as 17mm (0.67") in February. The number of rainy days decreases to an annual low of 10.3 in February, with a reviving sunshine duration of 8.7 hours. The conditions make the winter weather in Poás a welcome reprieve from the intense monsoon season.
Weather in January
In January, the weather in Poás, Costa Rica begins to show signs of the dry season. Warm daytime temperatures are complemented by cooler evenings, but rainfall is comparatively low. The notable factor in January is the relatively low humidity of 75% coupled with a moderate wind speed of 10.5km/h (6.5mph). Weather in January »
Weather in February
February in Poás, Costa Rica is marked by a consistent continuation of the dry season. The weather pattern is rightly proportioned between a balance of sunlight, wind, and rainfall. The most notable observance during this period is the longest daylight hours of 11.8h, which makes February the month with one of the most daylight hours. Weather in February »
Weather in March
March weather in Poás, Costa Rica presents as the transition phase from the dry to the wet season. The increase in temperature is then accompanied by heightened rainfall and relative humidity. Among the climatic parameters of March, the high temperature of 29.7°C (85.5°F) distinctly stands out as a noticeable characteristic. Weather in March »
Weather in April
April in Poás, Costa Rica is characterized by a fully-fledged wet season. Marked by higher night temperatures and rainfall, the month experiences a dip in wind speed. The highly distinguishing feature of April is the maximum precipitation of 86mm (3.39"), indicating the month as the beginning of the peak rainy season. Weather in April »
Weather in May
Weather in Poás, Costa Rica during May inherits the characteristics of the wet season from April but with more intensity. The month experiences the first instance of extreme rainfall amounts reaching 339mm (13.35"). Overall, the combination of humidity, precipitation and cloud cover form a notable feature of May's climatic conditions. Weather in May »
Weather in June
June is not much different in terms of the general weather pattern in Poás, Costa Rica. Notwithstanding the persistent rain, outdoor activities remain possible, largely due to stable temperatures. Only a slight reduction in temperatures makes the weather of June stand out as compared to May. Weather in June »
Weather in July
July, much like June, continues the trend of the wet season in Poás, Costa Rica. The rainfall is sustained, relative humidity is high, and temperatures relatively stable. The defining feature of July's weather is the minimal daylight hours of 12.7h. Weather in July »
Weather in August
Bearing the brunt of the wet season, August in Poás, Costa Rica presents the continued trend of high rainfall alongside reduced temperatures. The humidity and wind speeds remain constant from July, further strengthening the consistency of the wet season. Weather in August »
Weather in September
As the final third of the year begins, September in Poás, Costa Rica holds the record for the highest rainfall of 288mm (11.34"), marking the peak of the rainy season. The humidity, temperature, and wind speed sustain the same values as those in August. Weather in September »
Weather in October
October holds the title for the wettest month in Poás, Costa Rica, as the rainfall reaches its absolute peak. The consistent temperatures and high humidity from September continue through this month. The longest living testament to Costa Rica's wet season is the 396mm (15.59") of rainfall during October. Weather in October »
Weather in November
November, the last month of the autumn in Poás, is also a moderately hot month, with temperature in the range of an average high of 25.9°C (78.6°F) and an average low of 18.2°C (64.8°F). November's average high-temperature is a still moderately hot 25.9°C (78.6°F), maintaining a close comparison with October's 25.4°C (77.7°F). Weather in November »
Weather in December
As the year draws to a close, December in Poás, Costa Rica marks the transition from the wet season back to the dry season. The decrease in rainfall, the drop in humidity, and moderate temperatures indicate this change. The remarkable shift in December's conditions is clearly evident in the drastic reduction in rainfall to 46mm (1.81"). Weather in December »
[Resources]Frequently asked questions
How much does it rain in Poás?
In Poás, Costa Rica, during the entire year, the rain falls for 272 days and collects up to 2217mm (87.28") of precipitation.
What are the months with the highest UV index in Poás?
January through April, June, July, September, October and December, with an average maximum UV index of 6, are months with the highest UV index in Poás, Costa Rica.
What is the driest month in Poás?
The month with the least rainfall in Poás, Costa Rica, is February, when the rain falls for 10.3 days and typically collects 17mm (0.67") of precipitation.
What time of the year is the hottest in Poás?
Poás sees its peak of temperatures during March and April, with an average high-temperature of 29.7°C (85.5°F).
What is the least humid month in Poás?
With an average relative humidity of 70%, March is the least humid month in Poás.
What month has the most sunshine in Poás?
The month with the most sunshine is March, with an average of 9.4h of sunshine.
What are the months with the lowest UV index in Poás?
The months with the lowest UV index in Poás, Costa Rica, are May, August and November, with an average maximum UV index of 5.
When are the longest days in Poás?
June has the longest days of the year in Poás, with an average of 12h and 42min of daylight.
What are the coldest months in Poás?
Poás, Costa Rica, experiences its average lowest temperatures in October, reaching a peak of 25.4°C (77.7°F) and a minimum of 18.9°C (66°F).
What is the most humid month in Poás?
The most humid month in Poás is October, with an average relative humidity of 89%.
What is the wettest month in Poás?
The month with the most rainfall in Poás, Costa Rica, is October, when the rain falls for 30.2 days and typically aggregates up to 396mm (15.59") of precipitation.
What is the month with the least sunshine in Poás?
October has the least sunshine of the year in Poás, with an average of 7h of sunshine.
What is the month with the shortest days in Poás?
With an average of 11h and 30min of daylight, December has the shortest days of the year in Poás, Costa Rica.
Is there Daylight Saving Time (DST) in Poás?
Poás does not observe Daylight Saving Time (DST). CST timezone is used throughout the entire year.
Average temperature
Poás, Costa Rica
The warmest months (with the highest average high temperature) are March and April (29.7°C).
The month with the lowest average high temperature is October (25.4°C).
The month with the highest average low temperature is May (19.8°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).
Average pressure
Poás, Costa Rica
- Average pressure in January:
1012.1mbar - Average pressure in February:
1011.8mbar - Average pressure in March:
1011.9mbar - Average pressure in April:
1011.3mbar - Average pressure in May:
1011mbar - Average pressure in June:
1011mbar
- Average pressure in July:
1011.3mbar - Average pressure in August:
1011.2mbar - Average pressure in September:
1011mbar - Average pressure in October:
1010.7mbar - Average pressure in November:
1010.9mbar - Average pressure in December:
1011.5mbar
The month with the highest atmospheric pressure is January (1012.1mbar).
The month with the lowest atmospheric pressure is October (1010.7mbar).
Average wind speed
Poás, Costa Rica
- Average wind speed in January:
10.5km/h - Average wind speed in February:
10.6km/h - Average wind speed in March:
9.5km/h - Average wind speed in April:
6.6km/h - Average wind speed in May:
4.8km/h - Average wind speed in June:
4.5km/h
- Average wind speed in July:
6km/h - Average wind speed in August:
4.6km/h - Average wind speed in September:
3.8km/h - Average wind speed in October:
4.1km/h - Average wind speed in November:
6.2km/h - Average wind speed in December:
8.7km/h
The windiest month (with the highest average wind speed) is February (10.6km/h).
The calmest month (with the lowest average wind speed) is September (3.8km/h).
Average humidity
Poás, Costa Rica
The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).
Average rainfall
Poás, Costa Rica
- Average rainfall in January:
21mm - Average rainfall in February:
17mm - Average rainfall in March:
21mm - Average rainfall in April:
86mm - Average rainfall in May:
339mm - Average rainfall in June:
323mm
- Average rainfall in July:
249mm - Average rainfall in August:
287mm - Average rainfall in September:
288mm - Average rainfall in October:
396mm - Average rainfall in November:
144mm - Average rainfall in December:
46mm
The wettest month (with the highest rainfall) is October (396mm).
The driest month (with the least rainfall) is February (17mm).
Average rainfall days
Poás, Costa Rica
- Average rainfall days in January:
11.3 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
14.5 days - Average rainfall days in April:
20 days - Average rainfall days in May:
27.2 days - Average rainfall days in June:
28 days
- Average rainfall days in July:
28.3 days - Average rainfall days in August:
27.6 days - Average rainfall days in September:
29.4 days - Average rainfall days in October:
30.2 days - Average rainfall days in November:
26.9 days - Average rainfall days in December:
18.3 days
The month with the highest number of rainy days is October (30.2 days).
The month with the least rainy days is February (10.3 days).
Average daylight / Average sunshine
Poás, 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 2min - 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 2min - Average sunshine in February:
9h and 1min - Average sunshine in March:
9h and 2min - Average sunshine in April:
9h and 1min - Average sunshine in May:
7h and 5min - Average sunshine in June:
7h and 5min
- Average sunshine in July:
8h and 4min - Average sunshine in August:
7h and 5min - Average sunshine in September:
7h and 4min - Average sunshine in October:
7h and 0min - Average sunshine in November:
7h and 3min - Average sunshine in December:
8h and 4min
The month with the most sunshine is March (Average sunshine: 9h and 24min).
The month with the least sunshine is October (Average sunshine: 7h and 0min).
Average sunshine days
Poás, Costa Rica
- Average sunshine days in January:
16.7 days - Average sunshine days in February:
15 days - Average sunshine days in March:
14.6 days - Average sunshine days in April:
8.2 days - Average sunshine days in May:
2.8 days - Average sunshine days in June:
1.7 days
- Average sunshine days in July:
2.2 days - Average sunshine days in August:
2.8 days - Average sunshine days in September:
0.5 days - Average sunshine days in October:
0.6 days - Average sunshine days in November:
2.4 days - Average sunshine days in December:
10.1 days
The month with the most sunshine days is January (16.7 days).
The month with the least sunshine days is September (0.5 days).
Average UV index
Poás, Costa Rica
The months with the highest UV index are January, February, March, April, June, July, September, October and December (UV index 6).
The months with the lowest UV index are May, August and November (UV index 5).
Average cloud cover
Poás, Costa Rica
The month with the most cloud cover is October (Cloud cover 54).
The month with the least cloud cover is February (Cloud cover 19).
Average visibility
Poás, Costa Rica
The months with the highest visibility are February and March (10km).
The months with the lowest visibility are August, September, October and November (7km).
Poás, Costa Rica
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