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September Weather in Santa Clara, United States

Last updated: June 24, 2025

In September, the average temperature in {Santa Clara}, {United States} is a pleasant 20°C (69°F). Expect a minimum drop to 8°C (47°F), while the mercury can soar to a maximum of 33°C (92°F). With 43 mm (1.7 in) of precipitation spread over 6 days, you might want to pack an umbrella, especially with an average humidity level of 66%. Enjoy your stay!

September Temperature in Santa Clara

In September, in Santa Clara, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dipping as low as 8°C (47°F). This weather makes Santa Clara an ideal destination for travelers seeking a pleasant climate.

September Weather in Santa Clara: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santa Clara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Clara, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec394250596776767469595041
Data source: Temperature data for Santa Clara generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Santa Clara

In Santa Clara in September, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

September Precipitation Trends in Santa Clara

The chart displays monthly precipitation patterns in Santa Clara, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Santa Clara, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec3341285614824743243130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Clara

In Santa Clara in September humidity is 66%. With an average temperature of 20°C (69°F), this humidity feels like a gentle enveloping warmth, making it comfortable for traveling but with a slight stickiness that may encourage you to seek shade or refreshments frequently.

September Average Humidity in Santa Clara

This chart illustrates the average monthly humidity levels in Santa Clara, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Santa Clara is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%82%68%55%45%37%43%53%66%72%81%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santa Clara

In Santa Clara in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Santa Clara.

Maximum UV Index Levels in Santa Clara for September

The chart shows the monthly maximum UV Index (UVI) for Santa Clara in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Santa Clara typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5810121213131211965
Data source: Santa Clara September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Santa Clara Compares to Other Months

Weather in Santa Clara varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Santa Clara, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Santa Clara, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)33 mm (1.3 inches)81%moderate
February Weather6°C (42°F)41 mm (1.6 inches)82%very high
March Weather10°C (50°F)28 mm (1.1 inches)68%very high
April Weather15°C (59°F)5 mm (0.2 inches)55%extreme
May Weather19°C (67°F)6 mm (0.2 inches)45%extreme
June Weather25°C (76°F)14 mm (0.5 inches)37%extreme
July Weather24°C (76°F)82 mm (3.2 inches)43%extreme
August Weather23°C (74°F)47 mm (1.9 inches)53%extreme
September Weather20°C (69°F)43 mm (1.7 inches)66%extreme
October Weather15°C (60°F)24 mm (1.0 inches)72%very high
November Weather10°C (50°F)31 mm (1.2 inches)81%high
December Weather5°C (41°F)30 mm (1.2 inches)84%moderate

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