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 shift into September in San Diego uncovers an average high-temperature of a pleasant 22.9°C (73.2°F), subtly different from the previous month. In San Diego, September is marked by an average low-temperature of 16.5°C (61.7°F).Humidity
In September, the average relative humidity in San Diego is 89%.Rainfall
In San Diego, in September, during 29.7 rainfall days, 320mm (12.6") of precipitation is typically accumulated. Throughout the year, in San Diego, there are 305 rainfall days, and 2534mm (99.76") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 11min.On the first day of the month, sunrise is at 05:26 and sunset at 17:44. On the last day of September, sunrise is at 05:24 and sunset at 17:26 CST.
Sunshine
In September, the average sunshine is 7.3h.UV index
The months with the highest UV index are January through December, with an average maximum UV index of 5. The months with the lowest UV index in San Diego are January through December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Undertake protective steps - Recommendations to avoid sunburn are issued. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What are the temperatures in San Diego in September?
What is the average humidity in September in San Diego?
How much does it rain in San Diego in September?
How many hours of daylight does San Diego have in September?
When are sunrise and sunset in September in San Diego?
How long on average sun shines in September in San Diego?
What is the month with the highest UV index in San Diego?
What are the months with the lowest UV index in San Diego?
How high is the UV index in September in San Diego?
Average temperature in September
San Diego, Costa Rica
- Average high temperature in September: 22.9°C
The warmest month (with the highest average high temperature) is April (25.3°C).
The month with the lowest average high temperature is October (22.2°C).
- Average low temperature in September: 16.5°C
The month with the highest average low temperature is May (16.9°C).
The coldest month (with the lowest average low temperature) is January (13.7°C).
Average pressure in September
San Diego, Costa Rica
- Average pressure in September: 1011.2mbar
The month with the highest atmospheric pressure is January (1012.4mbar).
The month with the lowest atmospheric pressure is October (1010.9mbar).
Average wind speed in September
San Diego, Costa Rica
- Average wind speed in September: 3.7km/h
The windiest month (with the highest average wind speed) is February (8.6km/h).
The calmest month (with the lowest average wind speed) is September (3.7km/h).
Average humidity in September
San Diego, Costa Rica
- Average humidity in September: 89%
The month with the highest relative humidity is October (90%).
The month with the lowest relative humidity is February (76%).
Average rainfall in September
San Diego, Costa Rica
- Average rainfall in September: 320mm
The wettest month (with the highest rainfall) is October (444mm).
The driest month (with the least rainfall) is February (33mm).
Average rainfall days in September
San Diego, Costa Rica
- Average rainfall days in September: 29.7 days
The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (14.9 days).
Average daylight in September /
Average sunshine in September
San Diego, 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 2min
The month with the most sunshine is February (Average sunshine: 9h and 6min).
The month with the least sunshine is October (Average sunshine: 6h and 30min).
Average sunshine days in September
San Diego, Costa Rica
- Average sunshine days in September: 0.3 days
The month with the most sunshine days is February (10.4 days).
The month with the least sunshine days is October (0.1 days).
Average UV index in September
San Diego, Costa Rica
- Average UV index in September: 5
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
Average cloud cover in September
San Diego, Costa Rica
- Average cloud cover in September: 56
The month with the most cloud cover is October (Cloud cover 61).
The month with the least cloud cover is February (Cloud cover 31).
Average visibility in September
San Diego, Costa Rica
- Average visibility in September: 6km
The months with the highest visibility are January, February and March (9km).
The months with the lowest visibility are September and October (6km).
San Diego, Costa Rica
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