Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The average high-temperature during September is a still moderately hot 26.3°C (79.3°F), almost matching the conditions of the preceding month. Atenas witnesses an average low-temperature of 19.2°C (66.6°F) throughout the month of September.Humidity
In September, the average relative humidity is 87%.Rainfall
In Atenas, Costa Rica, in September, during 29.4 rainfall days, 288mm (11.34") of precipitation is typically accumulated. Throughout the year, in Atenas, Costa Rica, there are 272 rainfall days, and 2217mm (87.28") of precipitation is accumulated.Daylight
In September, the average length of the day in Atenas, Costa Rica, is 12h and 11min.On the first day of the month, sunrise is at 05:28 and sunset at 17:46. On the last day of September, in Atenas, sunrise is at 05:26 and sunset at 17:28 CST.
Sunshine
In Atenas, the average sunshine in September is 7.6h.UV index
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 Atenas. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the average person.Note: In September, a daily UV index of 6 turns into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Frequently asked questions
What are the temperatures in Atenas in September?
What is the average humidity in September in Atenas?
How much does it rain in Atenas in September?
What is the average length of the day in September in Atenas?
When is the sunrise / sunset in September in Atenas?
How many hours of sunshine does Atenas have in September?
What are the months with the highest UV index in Atenas?
What is the UV index reading in September in Atenas?
Average temperature in September
Atenas, Costa Rica
- Average high temperature in September: 26.3°C
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).
- Average low temperature in September: 19.2°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 in September
Atenas, Costa Rica
- Average pressure in September: 1011mbar
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 in September
Atenas, Costa Rica
- Average wind speed in September: 3.8km/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 in September
Atenas, Costa Rica
- Average humidity in September: 87%
The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Atenas, Costa Rica
- Average rainfall in September: 288mm
The wettest month (with the highest rainfall) is October (396mm).
The driest month (with the least rainfall) is February (17mm).
Average rainfall days in September
Atenas, Costa Rica
- Average rainfall days in September: 29.4 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 in September /
Average sunshine in September
Atenas, Costa Rica
- Average daylight in September: 12h and 1min
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 September: 7h 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 in September
Atenas, Costa Rica
- Average sunshine days in September: 0.5 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 in September
Atenas, Costa Rica
- Average UV index in September: 6
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 in September
Atenas, Costa Rica
- Average cloud cover in September: 50
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 in September
Atenas, Costa Rica
- Average visibility in September: 7km
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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