Pomona Weather in September

What's the weather like in Pomona (California) in September 2025?

The climate in Pomona during September can be summarized as warm and dry.

September is in the fall / autumn in Pomona and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (87°F), whilst at night 14°C (58°F) is normal.

Pomona weather averages (imperial / metric)
Daytime temperature 30.4°C 86.7°F
Nightly temperature 14.4°C 57.9°F
Average temperature 22.4°C 72.3°F
Daily sunshine 10.2 hrs
Avg rainfall 10 mm 0.4 ins
Rainy days 2 days
Sea temperature 19.6°C 67.3°F
Humidity 63%
Windspeed 12.6kph 8 mph

On average September is the 6th driest month of the year in Pomona with around 10mm 0.4 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 10.2 hours of sunshine per day.

September temperatures in Pomona

Pomona average temperature in September

September rainfall

Pomona average rain in September

September hourly sunshine

Pomona average rain in September

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 Pomona 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

Pomona weather stats

Pomona weather statistics
Hottest month: August 32.4°C 90.3°F
Driest month: July 1mm 0ins
Sunniest month: August 11.7hrs
Coldest month: December 18.1°C 64.6°F
Wettest month: February 90mm 3.5ins
Map showing location of Pomona (34.05529, -117.75228) Pomona map pin © Google

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