Mountain View Weather in September

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

The climate in Mountain View during September can be summarized as warm and very dry.

September is in the fall / autumn in Mountain View and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 12°C (54°F) is normal.

Mountain View weather averages (imperial / metric)
Daytime temperature 27.2°C 81°F
Nightly temperature 12.4°C 54.3°F
Average temperature 19.8°C 67.6°F
Daily sunshine 10.9 hrs
Avg rainfall 7 mm 0.3 ins
Rainy days 2 days
Sea temperature 14.4°C 57.9°F
Humidity 64%
Windspeed 15.1kph 9 mph

On average September is the 4th driest month of the year in Mountain View with around 7mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.9 hours of sunshine per day.

September temperatures in Mountain View

Mountain View average temperature in September

September rainfall

Mountain View average rain in September

September hourly sunshine

Mountain View 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 Mountain View 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

Mountain View weather stats

Mountain View weather statistics
Hottest month: July 28°C 82.4°F
Driest month: July 1mm 0ins
Sunniest month: July 12.7hrs
Coldest month: January 12.7°C 54.9°F
Wettest month: January 117mm 4.6ins
Map showing location of Mountain View (38.00881, -122.11746) Mountain View map pin © Google

Locations nearby

Top United States locations