The climate in Tía Juana during September can be summarized as very hot, humid and damp.
September is in the fall / autumn in Tía Juana and is typically the warmest month of the year. Daytime maximum temperatures average around a steamy 33°C (92°F), whilst at night 24°C (76°F) is normal.
| Daytime temperature | 33.3°C 91.9°F |
|---|---|
| Nightly temperature | 24.2°C 75.5°F |
| Average temperature | 28.7°C 83.7°F |
| Daily sunshine | 7.1 hrs |
| Avg rainfall | 118 mm 4.6 ins |
| Rainy days | 9 days |
| Sea temperature | 28.6°C 83.4°F |
| Humidity | 78% |
| Windspeed | 10.4kph 7 mph |
On average September is the 2nd wettest month of the year in Tía Juana with around 118mm 4.6 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.1 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 Tía Juana in September 2025.
Best places to visit in September
| Hottest month: | September | 33°C 91.4°F |
|---|---|---|
| Driest month: | January | 6mm 0.2ins |
| Sunniest month: | January | 8.9hrs |
| Coldest month: | January | 31.2°C 88.2°F |
| Wettest month: | October | 143mm 5.6ins |