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United StatesThe weather in September in Cupertino
It's warm in September in Cupertino with an average temperature of 27°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 Cupertino. 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 Cupertino, 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 42°C in 2017, Cupertino reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 18°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 9°C to a highest value of 26°C.
Rainfall amount
According to weather history, there is only 4,9 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the Northwest.
Daily weather in September for Cupertino
Click on any day in September to get detailed info about the usual weather on that day in Cupertino. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Cupertino | New York | |
|---|---|---|
| Average temperature | 27°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 14°C | -5°C |
| Total precipitation | 4,9 mm | 57 mm |
| Rainy days | 1 day | 9 days |
Start of September
The month of September starts in Cupertino 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 Cupertino is around 27°C, while nighttime temps are about 16°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 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 Cupertino for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Cupertino, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Cupertino
Temperature in September in Cupertino over the years
Precipitation charts
These charts show the average amount of precipitation in September in Cupertino, 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 Cupertino
Total precipitation in September in Cupertino over the years
Daily UV index in September in Cupertino
This chart shows the average daily UV index in September in Cupertino, 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 Cupertino
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Average weather in Cupertino by month
Click on a month below to see detailed weather info for Cupertino. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.