The climate in La Unión during September can be summarized as hot and dry.
September is in the fall / autumn in La Unión and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 19°C (66°F) is normal.
| Daytime temperature | 27.6°C 81.7°F |
|---|---|
| Nightly temperature | 18.6°C 65.5°F |
| Average temperature | 23.1°C 73.6°F |
| Daily sunshine | 7.7 hrs |
| Avg rainfall | 26 mm 1 ins |
| Rainy days | 5 days |
| Sea temperature | 24.4°C 75.9°F |
| Humidity | 70% |
| Windspeed | 9.7kph 6 mph |
On average September is the 5th driest month of the year in La Unión with around 26mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.7 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 La Unión in September 2025.
Best places to visit in September
| Hottest month: | August | 28.9°C 84°F |
|---|---|---|
| Driest month: | July | 5mm 0.2ins |
| Sunniest month: | July | 10.5hrs |
| Coldest month: | January | 15.4°C 59.7°F |
| Wettest month: | October | 52mm 2ins |