Poway Weather in September

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

The climate in Poway during September can be summarized as warm, humid and very dry.

September is in the fall / autumn in Poway and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 17°C (62°F) is normal.

Poway weather averages (imperial / metric)
Daytime temperature 26.8°C 80.2°F
Nightly temperature 16.5°C 61.6°F
Average temperature 21.6°C 70.9°F
Daily sunshine 9.4 hrs
Avg rainfall 5 mm 0.2 ins
Rainy days 1 days
Sea temperature 20.5°C 68.9°F
Humidity 71%
Windspeed 13.3kph 8 mph

On average September is the 4th driest month of the year in Poway with around 5mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 9.4 hours of sunshine per day.

September temperatures in Poway

Poway average temperature in September

September rainfall

Poway average rain in September

September hourly sunshine

Poway 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 Poway 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

Poway weather stats

Poway weather statistics
Hottest month: August 27.7°C 81.9°F
Driest month: July 1mm 0ins
Sunniest month: January 8.4hrs
Coldest month: January 17.8°C 64°F
Wettest month: January 64mm 2.5ins
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