San Luis Weather in September

What's the weather like in San Luis (Baja California) in September 2025?

The climate in San Luis during September can be summarized as hot and dry.

September is in the fall / autumn in San Luis and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 34°C (92°F), whilst at night 16°C (61°F) is normal.

San Luis weather averages (imperial / metric)
Daytime temperature	33.5°C 92.2°F
Nightly temperature	16.4°C 61.4°F
Average temperature	24.9°C 76.8°F
Daily sunshine	8.9 hrs
Avg rainfall	21 mm 0.8 ins
Rainy days	2 days
Sea temperature	27°C 80.6°F
Humidity	67%
Windspeed	10.4kph 7 mph

On average September is the 3rd wettest month of the year in San Luis with around 21mm 0.8 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 8.9 hours of sunshine per day.

September temperatures in San Luis

San Luis average temperature in September

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 Luis in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Luis weather stats

San Luis weather statistics
Hottest month:	August	33.7°C 92.7°F
Driest month:	June	3mm 0.1ins
Sunniest month:	February	9hrs
Coldest month:	January	21.1°C 70°F
Wettest month:	December	35mm 1.4ins

Map showing location of San Luis (28.43333, -113.75)