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Contents
- The climate of Atenas
- The best time to visit Atenas
- The worst time to visit Atenas
- Spring weather in Atenas
- Summer weather in Atenas
- Autumn weather in Atenas
- Winter weather in Atenas
- 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 Atenas
Atenas, Costa Rica, falls under the Am classification of tropics according to the Köppen climate classification. This term signifies a monsoon climate which is seen across much of the region. It has a climate characterized by warmth, with varying degrees of rain through the year. The pressure remains consistent, with only minor fluctuations that range from 1010.7mb to 1012.1mb. The temperature sees highs from 25.4°C (77.7°F) to 29.7°C (85.5°F) and lows vary from a mild 16.8°C (62.2°F) up to 19.8°C (67.6°F), making it consistently temperate throughout.
There is high relative humidity throughout the year that ranges from 70% to 89%, providing a balmy environment. Sunlight varies from 7h to 9.4h per day, the most sunlight being in the first three months, declining gradually afterward. Rainfall parameters showcase distinct patterns, precipitation starts increasing from April, reaching its peak in October with 396mm (15.59"), and then declining. Months with lowest rainfall are the first quarter of the year. Wind speed is generally moderate, seeing highs up to 10.8km/h (6.7mph) and lows to 3.8km/h (2.4mph), with the highest speeds observed in the first quarter.
There is high relative humidity throughout the year that ranges from 70% to 89%, providing a balmy environment. Sunlight varies from 7h to 9.4h per day, the most sunlight being in the first three months, declining gradually afterward. Rainfall parameters showcase distinct patterns, precipitation starts increasing from April, reaching its peak in October with 396mm (15.59"), and then declining. Months with lowest rainfall are the first quarter of the year. Wind speed is generally moderate, seeing highs up to 10.8km/h (6.7mph) and lows to 3.8km/h (2.4mph), with the highest speeds observed in the first quarter.
The best time to visit Atenas
Considering climate conditions, the best period to visit Atenas would be the initial three months (January, February, and March) when there is the least rainfall recorded, with values between 17mm (0.67") and 21mm (0.83"). These months also offer the most daily sunshine, from 8.3h to 9.4h, and relatively less cloud coverage, making them well suited for outdoor activities. Furthermore, temperatures are comfortable, highs range from 27.3°C (81.1°F) to 29.7°C (85.5°F), and lows maintain between 16.8°C (62.2°F) to 17.9°C (64.2°F).
The worst time to visit Atenas
Considering the weather conditions, the least desirable period to visit would be during the rainy season, from May to November. September and October receive the highest rainfall, with 288mm (11.34") and 396mm (15.59") respectively. These months also have the least hours of sunshine, just about 7h, and increased cloud cover contributing to a less favorable setting for tourists. The temperature does remain stable, highs ranging from 25.4°C (77.7°F) to 27.7°C (81.9°F), and lows from 18.9°C (66°F) to 19.8°C (67.6°F).
Spring weather in Atenas
The spring months in Atenas, from March to May, bring a significant increase in rainfall, starting from 21mm (0.83") and soaring to a substantial 339mm (13.35"). This period marks the beginning of the wetter half of the year. At the same time, temperatures maintain their soaking warmth, with highs ranging from 27.7°C (81.9°F) to 29.7°C (85.5°F), and lows from 17.9°C (64.2°F) to 19.8°C (67.6°F). Sunshine hours decrease from 9.4h to 7.8h, and cloud cover increases slowly.
Summer weather in Atenas
Summer in Atenas, from June through August, is known for its substantial rainfall, from 323mm (12.72") to 287mm (11.3"). Despite the rain, temperatures continue to remain warm. Highs within these months range from 26.3°C (79.3°F) to 26.7°C (80.1°F) and lows from 18.9°C (66°F) to 19.5°C (67.1°F). The number of sunshine hours remains around 7.8h to 8.6h. The increase in relative humidity to 86% to 87% and increased cloud coverage signifies summer in Atenas is a wet season.
Autumn weather in Atenas
Autumn, from September to November, brings the most substantial rain to Atenas, starting at 288mm (11.34") and peaking at 396mm (15.59") in October, before reducing to 144mm (5.67"). Temperatures remain stable with highs from 25.4°C (77.7°F) to 26.3°C (79.3°F), and lows between 18.2°C (64.8°F) to 19.2°C (66.6°F). This period also has the least hours of sunlight, from 7h to 7.6h.
Winter weather in Atenas
Winter months, from December to February, usher in a relatively drier and comfortable season in Atenas. Rainfall drops significantly, between 21mm (0.83") and 46mm (1.81"). The temperature range remains consistent, with highs from 26.5°C (79.7°F) to 28.3°C (82.9°F), and lows from 16.8°C (62.2°F) to 17.2°C (63°F). Sunshine hours see an increase, starting from 7.5h and peaking at 9.1h in February, hinting at better weather for outdoor activities.
Weather in January
In Atenas, Costa Rica, the start of the new calendar year heralds a period of high temperatures and moderate rainfall. There's a marked presence of solar radiation during this period, and it's a season of considerably dry weather patterns. Weather in January »
Weather in February
During February, the weather in Atenas, Costa Rica becomes slightly warmer. Sunshine hours are longer, giving residents substantial daylight for outdoor activities. Although temperatures increase compared to January, the increase is minimal, ensuring the comfort of the inhabitants. Weather in February »
Weather in March
In March, Atenas, Costa Rica witnesses higher temperature averages, reaching 29.7°C (85.5°F). The city starts gearing up for the higher rainfall and humidity levels impending in the next few months. Relative to February, the city experiences increased daylight and sunshine hours. Weather in March »
Weather in April
In Atenas, Costa Rica, April is distinctly characterized by a substantial increase in rainfall, measured at 86mm (3.39"). This shift signals the start of the rainy season. The higher rainfall brings about increased levels of relative humidity, intensifying the hazy appearance of the city. Weather in April »
Weather in May
May in Atenas, Costa Rica, is notably wet, with the city registering maximum rainfall values of up to 339mm (13.35"). This is mainly due to the onset of the rainy season. During this period, the city experiences a distinct drop in sunshine hours and a rise in relative humidity. Weather in May »
Weather in June
In June, Atenas, Costa Rica experiences an almost steady weather pattern as compared to May. The majority of the city is cloud-covered, resulting in lesser sunshine and daylight hours. Even though the city still receives a high level of rainfall, measured at 323mm (12.72"), the decrease in comparison to May marks the beginning of a downward trend for the rest of the year. Weather in June »
Weather in July
During July, the weather in Atenas, Costa Rica undergoes slight fluctuations in comparison to the previous month. While the rainfall decreases to 249mm (9.8"), the number of rainfall days shows a marginal increase, indicating more frequent showers. Weather in July »
Weather in August
August in Atenas, Costa Rica, is characterized by a climb in rainfall amount to 287mm (11.3") and a drop in visibility to 7km (4.3mi), indicative of the humid and cloudy weather patterns. Though rainfall increases from July, it's considerably scattered as indicated by the number of rainfall days. Weather in August »
Weather in September
September in Atenas, Costa Rica observes the highest annual rainfall total, peaking at 396mm (15.59"). The city experiences increased cloud coverage, further reducing daylight and sunshine hours. Despite the ongoing rainy season, the temperatures remain fairly constant, ensuring warm conditions. Weather in September »
Weather in October
In October, Atenas, Costa Rica experiences a drop in rainfall quantity. However, the city remains considerably damp, as signified by high relative humidity levels. The weather trends from the previous month extend with continuous decline in sunshine hours and wind speeds. Weather in October »
Weather in November
As November rolls in, Atenas, Costa Rica welcomes a significant reduction in rainfall, recording 144mm (5.67"). This marks the beginning of the end of the city's rainy season, leading to a decrease in relative humidity and cloud coverage. Weather in November »
Weather in December
In December, Atenas, Costa Rica witnesses a notable drop in rainfall, measuring to a mere 46mm (1.81"). This signals the end of the rainy season and the arrival of the dry period. Simultaneously, the city showcases a surge in wind speeds reaching up to 8.7km/h (5.4mph). Weather in December »
[Resources]Frequently asked questions
How much does it rain in Atenas?
Throughout the year, in Atenas, Costa Rica, there are 272 rainfall days, and 2217mm (87.28") of precipitation is accumulated.
What are the months with the highest UV index in Atenas?
January through April, June, July, September, October and December, with an average maximum UV index of 6, are months with the highest UV index.
What is the driest month in Atenas?
The month with the least rainfall in Atenas, Costa Rica, is February, when the rain falls for 10.3 days and typically collects 17mm (0.67") of precipitation.
What is the warmest month in Atenas?
Atenas witnesses its highest temperatures in March and April, reaching an average of 29.7°C (85.5°F).
What is the least humid month in Atenas?
With an average relative humidity of 70%, March is the least humid month.
What month has the most sunshine in Atenas?
March has the most sunshine of the year, with an average of 9.4h of sunshine.
What are the months with the lowest UV index in Atenas?
The months with the lowest UV index are May, August and November, with an average maximum UV index of 5.
When are the longest days in Atenas?
June has the longest days of the year, with an average of 12h and 42min of daylight.
What is the coldest time of year in Atenas?
October, with its high-temperature average of 25.4°C (77.7°F) and a low-temperature average of 18.9°C (66°F), is the coldest month.
What is the most humid month in Atenas?
With an average relative humidity of 89%, October is the most humid month.
What is the wettest month in Atenas?
October is the month with the most rainfall. Rain falls for 30.2 days and accumulates 396mm (15.59") of precipitation.
What is the month with the least sunshine in Atenas?
October has the least sunshine of the year, with an average of 7h of sunshine.
What is the month with the shortest days in Atenas?
The month with the shortest days in Atenas is December, with an average of 11h and 36min of daylight.
Is there Daylight Saving Time (DST) in Atenas?
Atenas, Costa Rica, does not observe Daylight Saving Time (DST). CST timezone is used throughout the entire year.
Average temperature
Atenas, 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
Atenas, 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
Atenas, 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
Atenas, Costa Rica
The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).
Average rainfall
Atenas, 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
Atenas, 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
Atenas, 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 4min
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 36min).
- 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
Atenas, 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
Atenas, 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
Atenas, 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
Atenas, 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).
Atenas, Costa Rica
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