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September Weather in Campbell, United States

Last updated: June 24, 2025

In September, the average temperature in Campbell, United States is a pleasant 26°C (79°F). Expect some variation, with minimums dipping to 11°C (52°F) and highs soaring to 37°C (99°F). During this month, you can anticipate around 83 mm (3.3 in) of precipitation over approximately 8 days, contributing to an average humidity of 65%. Stay prepared for both warm days and occasional rain!

September Temperature in Campbell

In September in Campbell, the average temperature is 26°C (79°F). Maximums can reach 37°C (99°F), while minimums can drop as low as 11°C (52°F). Overall, this makes Campbell an ideal destination for travelers seeking warm weather with the possibility of cooler evenings.

September Weather in Campbell: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Campbell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Campbell, September typically has an average temperature of 26°C (79°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec464859647380848378675551
Data source: Temperature data for Campbell 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 Campbell

In Campbell in September, the precipitation amount reaches 83 mm (3.3 in) over the course of 8 days.

September Precipitation Trends in Campbell

The chart displays monthly precipitation patterns in Campbell, 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 Campbell, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec811221301891811045894831436086
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Campbell

In Campbell in September, humidity is 65%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making travel quite sticky and uncomfortable.

September Average Humidity in Campbell

This chart illustrates the average monthly humidity levels in Campbell, 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 Campbell is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Campbell

In Campbell 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 Campbell.

Maximum UV Index Levels in Campbell for September

The chart shows the monthly maximum UV Index (UVI) for Campbell 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 Campbell typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Campbell 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 Campbell Compares to Other Months

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

This table compares monthly weather conditions in Campbell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)81 mm (3.2 inches)80%moderate
February Weather9°C (48°F)122 mm (4.8 inches)79%high
March Weather15°C (59°F)130 mm (5.1 inches)78%very high
April Weather18°C (64°F)189 mm (7.4 inches)78%very high
May Weather23°C (73°F)181 mm (7.1 inches)81%extreme
June Weather27°C (81°F)104 mm (4.1 inches)78%extreme
July Weather29°C (84°F)58 mm (2.3 inches)73%extreme
August Weather29°C (84°F)94 mm (3.7 inches)66%extreme
September Weather26°C (79°F)83 mm (3.3 inches)65%very high
October Weather19°C (67°F)143 mm (5.6 inches)72%very high
November Weather13°C (56°F)60 mm (2.3 inches)82%high
December Weather10°C (51°F)85 mm (3.4 inches)87%moderate

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