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September Weather in Santa Clara, United States

Last updated: June 24, 2025

The average temperature in Santa Clara, United States during September is a pleasant 25°C (76°F). However, temperatures can vary widely, with minimums dipping to 5°C (41°F) and maximums soaring up to 41°C (106°F). Expect a gentle precipitation of about 5 mm (0.2 in) over just 1 day. With an average humidity of 47%, the climate remains comfortable for outdoor activities.

September Temperature in Santa Clara

In September in Santa Clara, the average temperature is 25°C (76°F). Maximums can reach 41°C (106°F) and minimums can be as low as 5°C (41°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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 25°C (76°F), with highs reaching up to 41°C (106°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec394350606881868576605040
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 5 mm (0.2 in) over a duration of 1 day.

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 5 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec45384411141895132734
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 47%. With an average temperature of 25°C (76°F), this humidity feels like a pleasantly warm embrace, making it ideal for traveling as you can enjoy the outdoors without feeling overwhelmed by muggy conditions.

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 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%82%72%62%45%34%30%31%47%62%77%80%
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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110754
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)45 mm (1.8 inches)80%moderate
February Weather6°C (43°F)38 mm (1.5 inches)82%high
March Weather10°C (51°F)44 mm (1.7 inches)72%very high
April Weather16°C (61°F)11 mm (0.4 inches)62%very high
May Weather20°C (68°F)14 mm (0.5 inches)45%extreme
June Weather27°C (82°F)1 mm (0.0 inches)34%extreme
July Weather30°C (86°F)8 mm (0.3 inches)30%extreme
August Weather29°C (85°F)9 mm (0.4 inches)31%extreme
September Weather25°C (76°F)5 mm (0.2 inches)47%very high
October Weather16°C (60°F)13 mm (0.5 inches)62%high
November Weather10°C (50°F)27 mm (1.1 inches)77%moderate
December Weather5°C (40°F)34 mm (1.3 inches)80%moderate

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