United StatesThe weather in September in California
It's hot in September in California with an average temperature of 33°C. Temperatures this month range from a low of 29°C to a high of 38°C. At night, you can expect temperatures between 15°C and 20°C.
September is an awesome month to be in California for sunny weather. You’ll have high temperatures and not much chance of rain this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for California, United States. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 46°C in 2022, California reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 21°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 9°C to a highest value of 28°C.
Rainfall amount
According to weather history, there is only 1 mm of precipitation in September. The wind speed is around 3 Bft, mostly coming from the West.
Daily weather in September for California
Click on any day in September to get detailed info about the usual weather on that day in California. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| California | New York | |
|---|---|---|
| Average temperature | 33°C | 27°C |
| Max. temperature | 38°C | 31°C |
| Min. temperature | 15°C | -5°C |
| Total precipitation | 1 mm | 57 mm |
| Rainy days | 1 day | 9 days |
Start of September
The month of September starts in California with hot temps, averaging around 37°C during the day and nights around 20°C.
Mid September
By mid-September, daytime temps drop to around 33°C, with nights around 18°C. No precipitation expected during this period, so you can enjoy plenty of sunshine.
End of September
By the end of September, the average daytime temperature in California is around 32°C, while nighttime temps are about 17°C. No precipitation expected at the end of the month; it’ll be mostly sunny.
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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.
Check out the climate of California for all months and discover the best travel time
The climate in California is based on weather data from . Other places, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in California to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in California, United States. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in California
Temperature in September in California over the years
Precipitation charts
These charts show the average amount of precipitation in September in California, United States. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in California
Total precipitation in September in California over the years
Daily UV index in September in California
This chart shows the average daily UV index in September in California, 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.
Weather experiences in September in California
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Average weather in California by month
Click on a month below to see detailed weather info for California. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.