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United StatesThe weather in September in San Jose
It's warm in September in San Jose with an average temperature of 28°C. Temperatures this month range from a low of 24°C to a high of 31°C. At night, you can expect temperatures between 14°C and 18°C.
Looking for great weather? September is a good time to be in San Jose. The temperatures are nice, and there’s little 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 San Jose, 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 43°C in 2022, San Jose reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 17°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 9°C to a highest value of 27°C.
Rainfall amount
According to weather history, there is only 2,8 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the Northwest.
Daily weather in September for San Jose
Click on any day in September to get detailed info about the usual weather on that day in San Jose. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| San Jose | New York | |
|---|---|---|
| Average temperature | 28°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 14°C | -5°C |
| Total precipitation | 2,8 mm | 57 mm |
| Rainy days | 1 day | 9 days |
Start of September
The month of September starts in San Jose with hot temps, averaging around 29°C during the day and nights around 17°C.
Mid September
By mid-September, daytime temps drop to around 27°C, with nights around 16°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 San Jose is around 28°C, while nighttime temps are about 16°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 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of San Jose for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in San Jose, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in San Jose
Temperature in September in San Jose over the years
Precipitation charts
These charts show the average amount of precipitation in September in San Jose, 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 San Jose
Total precipitation in September in San Jose over the years
Daily UV index in September in San Jose
This chart shows the average daily UV index in September in San Jose, 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 San Jose
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Average weather in San Jose by month
Click on a month below to see detailed weather info for San Jose. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.