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September Weather in Red Bluff, United States

Last updated: June 24, 2025

In Red Bluff, United States, the average temperature in September hovers around 24°C (76°F). However, be prepared for temperature fluctuations, with minima dropping to 7°C (45°F) and maxima soaring up to 43°C (109°F). During this month, expect a modest precipitation amount of 8 mm (0.3 in) over the course of 1 day, paired with an average humidity of 46%.

September Temperature in Red Bluff

In September in Red Bluff, the average temperature is 24°C (76°F), with maximums reaching 43°C (109°F) and minimums dropping as low as 7°C (45°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both hot and cool conditions.

September Weather in Red Bluff: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Red Bluff, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Red Bluff, September typically has an average temperature of 24°C (76°F), with highs reaching up to 43°C (109°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec485054616980868476655548
Data source: Temperature data for Red Bluff 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 Red Bluff

In Red Bluff in September, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

September Precipitation Trends in Red Bluff

The chart displays monthly precipitation patterns in Red Bluff, 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 Red Bluff, September typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec137127126593770183969101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Red Bluff

In Red Bluff in September humidity is 46%. With an average temperature of 24°C (76°F), this humidity feels like a warm embrace, making it quite pleasant for exploring the surroundings and enjoying outdoor activities without feeling overly sticky or uncomfortable.

September Average Humidity in Red Bluff

This chart illustrates the average monthly humidity levels in Red Bluff, 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 Red Bluff is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Red Bluff

In Red Bluff in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Red Bluff.

Maximum UV Index Levels in Red Bluff for September

The chart shows the monthly maximum UV Index (UVI) for Red Bluff 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 Red Bluff typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110109642
Data source: Red Bluff 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 Red Bluff Compares to Other Months

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

This table compares monthly weather conditions in Red Bluff, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)137 mm (5.4 inches)86%moderate
February Weather10°C (51°F)127 mm (5.0 inches)87%moderate
March Weather12°C (54°F)126 mm (5.0 inches)86%high
April Weather16°C (61°F)59 mm (2.3 inches)83%very high
May Weather21°C (70°F)37 mm (1.5 inches)72%very high
June Weather26°C (80°F)7 mm (0.3 inches)67%extreme
July Weather30°C (86°F)0 mm (0.0 inches)56%very high
August Weather29°C (84°F)1 mm (0.0 inches)42%very high
September Weather24°C (76°F)8 mm (0.3 inches)46%very high
October Weather18°C (65°F)39 mm (1.5 inches)67%high
November Weather13°C (55°F)69 mm (2.7 inches)86%moderate
December Weather9°C (48°F)101 mm (4.0 inches)86%low

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