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September Weather in Redwood, United States

Last updated: June 24, 2025

In September, the average temperature in Redwood, United States hovers around 17°C (62°F), with potential extremes ranging from a chilly 0°C (33°F) to a warm 32°C (89°F). Expect about 75 mm (3.0 in) of rainfall spread over 9 days, and do prepare for a moderately humid atmosphere with an average humidity of 72%.

September Temperature in Redwood

In September in Redwood, the average temperature is 17°C (62°F). Maximums can reach 32°C (89°F), while minimums can drop as low as 0°C (33°F). This diverse range of temperatures makes Redwood an exciting destination for travelers looking to experience varied weather conditions.

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

The chart illustrates September temperature patterns in Redwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Redwood, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (89°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec222432445765716962523728
Data source: Temperature data for Redwood 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 Redwood

In Redwood in September, the precipitation amount is 75 mm (3.0 in) distributed over 9 days.

September Precipitation Trends in Redwood

The chart displays monthly precipitation patterns in Redwood, 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 Redwood, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8684881301041041371067516111998
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Redwood

In Redwood in September humidity is 72%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially heavy on the skin, prompting travelers to seek shade during midday excursions.

September Average Humidity in Redwood

This chart illustrates the average monthly humidity levels in Redwood, 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 Redwood is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%86%82%75%68%69%67%72%83%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Redwood

In Redwood in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Redwood.

Maximum UV Index Levels in Redwood for September

The chart shows the monthly maximum UV Index (UVI) for Redwood 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 Redwood typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899997532
Data source: Redwood 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 Redwood Compares to Other Months

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

This table compares monthly weather conditions in Redwood, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)86 mm (3.4 inches)93%low
February Weather-4°C (25°F)84 mm (3.3 inches)93%moderate
March Weather0°C (32°F)88 mm (3.5 inches)86%moderate
April Weather7°C (44°F)130 mm (5.1 inches)82%very high
May Weather14°C (57°F)104 mm (4.1 inches)75%very high
June Weather19°C (66°F)104 mm (4.1 inches)68%very high
July Weather22°C (72°F)137 mm (5.4 inches)69%very high
August Weather21°C (70°F)106 mm (4.2 inches)67%very high
September Weather17°C (62°F)75 mm (3.0 inches)72%high
October Weather11°C (52°F)160 mm (6.3 inches)83%moderate
November Weather3°C (37°F)119 mm (4.7 inches)88%moderate
December Weather-2°C (28°F)98 mm (3.8 inches)89%low

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