Weathermondo.com
United StatesThe weather in September in Santa Rosa
It's warm in September in Santa Rosa with an average temperature of 29°C. Temperatures this month range from a low of 25°C to a high of 35°C. At night, you can expect temperatures between 10°C and 14°C.
Looking for great weather? September is a good time to be in Santa Rosa. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Santa Rosa, California. 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 45°C in 2022, Santa Rosa reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 16°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of 3°C to a highest value of 19°C.
Rainfall amount
According to weather history, there is only 8,1 mm of precipitation in September. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for Santa Rosa
Click on any day in September to get detailed info about the usual weather on that day in Santa Rosa. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Santa Rosa | New York | |
|---|---|---|
| Average temperature | 29°C | 27°C |
| Max. temperature | 35°C | 31°C |
| Min. temperature | 10°C | -5°C |
| Total precipitation | 8,1 mm | 57 mm |
| Rainy days | 2 days | 9 days |
Start of September
The month of September starts in Santa Rosa with hot temps, averaging around 31°C during the day and nights around 13°C.
Mid September
By mid-September, daytime temps drop to around 28°C, with nights around 12°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Santa Rosa is around 29°C, while nighttime temps are about 12°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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UV index
The UV index is a maximum of 9 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 Santa Rosa for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Santa Rosa, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Santa Rosa
Temperature in September in Santa Rosa over the years
Precipitation charts
These charts show the average amount of precipitation in September in Santa Rosa, California. 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 Santa Rosa
Total precipitation in September in Santa Rosa over the years
Daily UV index in September in Santa Rosa
This chart shows the average daily UV index in September in Santa Rosa, 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 Santa Rosa
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Average weather in Santa Rosa by month
Click on a month below to see detailed weather info for Santa Rosa. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.