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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 (63°F), with a range that can dip to a chilly 1°C (33°F) and soar to a blistering 39°C (102°F). Expect a light precipitation of about 37 mm (1.5 in) spread over approximately 5 days, while the average humidity lingers at 66%. Prepare accordingly for a month full of weather variety!

September Temperature in Redwood

In September in Redwood, the average temperature is 17°C (63°F). The maximum can reach 39°C (102°F) and the minimum can be as low as 1°C (33°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

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 (63°F), with highs reaching up to 39°C (102°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec393943495663707063524437
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 37 mm (1.5 in) spread over a period of 5 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 37 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec1731851241025120153749111146
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 66%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel refreshing yet slightly muggy, perfect for leisurely strolls or picturesque outdoor explorations, but travelers should be prepared for occasional discomfort as they navigate the vibrant sights.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468111110108642
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 Weather4°C (39°F)173 mm (6.8 inches)84%moderate
February Weather4°C (39°F)185 mm (7.3 inches)85%moderate
March Weather6°C (43°F)124 mm (4.9 inches)86%high
April Weather9°C (49°F)102 mm (4.0 inches)83%very high
May Weather13°C (56°F)51 mm (2.0 inches)83%extreme
June Weather17°C (64°F)20 mm (0.8 inches)83%extreme
July Weather21°C (71°F)1 mm (0.0 inches)78%very high
August Weather21°C (71°F)5 mm (0.2 inches)67%very high
September Weather17°C (63°F)37 mm (1.5 inches)66%very high
October Weather11°C (53°F)49 mm (1.9 inches)77%high
November Weather7°C (44°F)111 mm (4.4 inches)87%moderate
December Weather3°C (38°F)146 mm (5.7 inches)87%low

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