The climate in San Bartolomé during September can be summarized as warm and dry.
September is in the fall / autumn in San Bartolomé and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 17°C (63°F) is normal.
| Daytime temperature | 24.6°C 76.3°F |
|---|---|
| Nightly temperature | 17.4°C 63.3°F |
| Average temperature | 21°C 69.8°F |
| Daily sunshine | 8.3 hrs |
| Avg rainfall | 13 mm 0.5 ins |
| Rainy days | 2 days |
| Sea temperature | 23.3°C 73.9°F |
| Humidity | 68% |
| Windspeed | 15.5kph 10 mph |
On average September is the 5th driest month of the year in San Bartolomé with around 13mm 0.5 inches of rain making it a dry time to visit. This rainfall is typically spread over 2 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.3 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Bartolomé in September 2025.
Best places to visit in September
| Hottest month: | August | 25.2°C 77.4°F |
|---|---|---|
| Driest month: | July | 1mm 0ins |
| Sunniest month: | August | 9.8hrs |
| Coldest month: | January | 16.9°C 62.4°F |
| Wettest month: | December | 52mm 2ins |