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Temperatures in September

It's warm in September in Walnut Creek with an average temperature of 29°C. Temperatures this month range from a low of 25°C to a high of 32°C. At night, you can expect temperatures between 14°C and 17°C.

Max and Min Temperatures per Day

Daily Temperature in September in Walnut Creek

This chart shows the daily maximum and minimum temperatures in degrees Celsius for Walnut Creek in September. The red line indicates the max temperatures, and the blue line shows the minimums.

Start of September

The month of September starts in Walnut Creek with hot temperatures, averaging around 31°C during the day and nights close to 17°C. You won’t see any precipitation in the first days of the month, it’s all sunny skies.

Since temperatures can differ between day and night, it’s a good idea to dress in layers.

Mid-September

By mid-September, the average daytime temperature drops to around 28°C, with nights close to 16°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.

Temperatures vary between day and night, so it’s smart to wear layers.

End of September

By the end of September, the average daytime temperature in Walnut Creek will be around 28°C, with nights close to 15°C. No precipitation expected, with plenty of sunshine on the horizon.

As it gets cooler in the evening, it’s best to wear layers.

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Precipitation in September

According to weather history, there is only 3,9 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the West.

The average chance of precipitation is only 2% in September.

Precipitation Chance

Daily precipitation chance in percentages for Walnut Creek in September

This chart shows the daily precipitation chance (in percentages) in September for Walnut Creek. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.

Walnut Creek in September

London
Temperature Average Temperature
29°C 20°C
Sun High Temp
32°C 22°C
Sun Low Temp
25°C 17°C
Rain Total Precipitation
3,9 mm 44 mm
Rain Rainy Days
1 day 8 days

UV index

The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

Is September a good time to visit Walnut Creek?

Want nice weather? Then September is a great time to be in Walnut Creek. You’ll have pleasant temperatures and not too much rain this month.

Temperature records for Walnut Creek in September

With 43°C, Walnut Creek hit the highest temperature in the last 10 years in September 2022. The lowest daytime temperature in this month was 19°C in 2015. The extreme night temperatures ranged from a low of 9°C to a high of 24°C.

Check out the climate of Walnut Creek for all months and discover the best travel time

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Daily Temperature in September in Walnut Creek

This chart shows the average daily temperatures, both day and night, for each day in September in Walnut Creek, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.

Daily Temperature in September in Walnut Creek

Daily Precipitation in September in Walnut Creek

The chart below shows the average daily precipitation in September for Walnut Creek, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.

A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect about 1 day of rain in Walnut Creek.

Daily Precipitation in September in Walnut Creek

Daily UV Index in September in Walnut Creek

This chart shows the average daily UV index in September in Walnut Creek, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

Daily UV Index in September in Walnut Creek

Temperature in September in Walnut Creek Over the Years

This chart shows the average temperature in September in Walnut Creek, measured in degrees Celsius, over the past years.

Temperature in September in Walnut Creek Over the Years

Total Precipitation in September in Walnut Creek Over the Years

This chart shows the average precipitation in September in Walnut Creek, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.

Precipitation in September in Walnut Creek Over the Years

Daily climate in September for Walnut Creek

Click on a specific day in September for detailed info on the typical weather on that day in Walnut Creek. Check out the historical temperatures and precipitation over the past 10 years on this day.

Weather experiences in September in Walnut Creek

Have you been to Walnut Creek in September?

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Average Weather in Walnut Creek by Month

Click on a month below to see detailed weather info for Walnut Creek. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.


Or check out the climate of Walnut Creek for all months at once

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