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September Weather in Sedro-Woolley, United States

Last updated: June 24, 2025

In Sedro-Woolley, United States, the average temperature in September hovers around 15°C (59°F), with a comfortable minimum of 6°C (43°F) and an inviting maximum of 29°C (84°F). Expect 146 mm (5.8 in) of precipitation spread over 12 days, contributing to an average humidity of 76%. Perfect for those who enjoy a refreshing climate!

September Temperature in Sedro-Woolley

In September in Sedro-Woolley, the average temperature is 15°C (59°F). The maximum can reach 29°C (84°F), while the minimum can drop to as low as 6°C (43°F). This range makes Sedro-Woolley a comfortable destination for travelers looking to enjoy mild weather and outdoor activities.

September Weather in Sedro-Woolley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sedro-Woolley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sedro-Woolley, September typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (84°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec383641475459636459494338
Data source: Temperature data for Sedro-Woolley 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 Sedro-Woolley

In Sedro-Woolley in September, the precipitation amount is 146 mm (5.8 in) spread over 12 days.

September Precipitation Trends in Sedro-Woolley

The chart displays monthly precipitation patterns in Sedro-Woolley, 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 Sedro-Woolley, September typically receives around 146 mm (5.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec23624419114683753126146229313271
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sedro-Woolley

In Sedro-Woolley in September humidity is 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

September Average Humidity in Sedro-Woolley

This chart illustrates the average monthly humidity levels in Sedro-Woolley, 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 Sedro-Woolley is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sedro-Woolley

In Sedro-Woolley 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 Sedro-Woolley.

Maximum UV Index Levels in Sedro-Woolley for September

The chart shows the monthly maximum UV Index (UVI) for Sedro-Woolley 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 Sedro-Woolley typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: Sedro-Woolley 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 Sedro-Woolley Compares to Other Months

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

This table compares monthly weather conditions in Sedro-Woolley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)236 mm (9.3 inches)87%low
February Weather2°C (36°F)244 mm (9.6 inches)86%moderate
March Weather5°C (42°F)191 mm (7.5 inches)88%moderate
April Weather8°C (47°F)146 mm (5.8 inches)86%high
May Weather12°C (54°F)82 mm (3.2 inches)82%very high
June Weather15°C (59°F)75 mm (3.0 inches)82%very high
July Weather17°C (63°F)31 mm (1.2 inches)85%very high
August Weather18°C (64°F)26 mm (1.0 inches)77%very high
September Weather15°C (59°F)146 mm (5.8 inches)76%high
October Weather9°C (49°F)229 mm (9.0 inches)88%moderate
November Weather6°C (43°F)312 mm (12.3 inches)88%low
December Weather3°C (38°F)271 mm (10.7 inches)89%low

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