San Blas Weather in September
What's the weather like in San Blas (Sinaloa) in September 2025?
The climate in San Blas during September can be summarized as very hot and damp.
September is in the fall / autumn in San Blas and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 36°C (96°F), whilst at night 23°C (73°F) is normal.
| Daytime temperature | 35.6°C 96.1°F |
|---|---|
| Nightly temperature | 22.6°C 72.7°F |
| Average temperature | 29.1°C 84.4°F |
| Daily sunshine | 7.8 hrs |
| Avg rainfall | 101 mm 4 ins |
| Rainy days | 8 days |
| Sea temperature | 30.9°C 87.7°F |
| Humidity | 69% |
| Windspeed | 7.9kph 5 mph |
On average September is the 3rd wettest month of the year in San Blas with around 101mm 4 inches of rain making it a damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.8 hours of sunshine per day.
September temperatures in San Blas
September rainfall
September hourly sunshine
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 Blas in September 2025.
Other monthly averages
Best places to visit in September
San Blas weather stats
| Hottest month: | July | 36.5°C 97.7°F |
|---|---|---|
| Driest month: | April | 1mm 0ins |
| Sunniest month: | November | 8.1hrs |
| Coldest month: | January | 26°C 78.8°F |
| Wettest month: | August | 145mm 5.7ins |
© Google
Top Mexico locations
- Acapulco
- Cabo San Lucas
- Cancún
- Cozumel
- Guadalajara
- Guanajuato
- Mazatlán
- Mexico City
- Oaxaca de Juárez
- Playa del Carmen
- Puebla
- Puerto Vallarta
- San Miguel de Allende
- Todos Santos
- Zihuatanejo