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September Weather in Suquamish, United States

Last updated: June 24, 2025

In September, the average temperature in Suquamish, United States hovers around 16°C (62°F), with a comfortable range between 9°C (48°F) and 28°C (83°F). Expect a touch of rain, as precipitation averages 84 mm (3.3 in) over about 13 days. With an average humidity of 74%, it's a great time to embrace the charm of this locale!

September Temperature in Suquamish

In September in Suquamish, the average temperature is 16°C (62°F). Maximums can reach 28°C (83°F), and minimums can drop to as low as 9°C (48°F). Travelers should pack a mix of clothing options to comfortably enjoy the pleasant yet variable weather conditions.

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

The chart illustrates September temperature patterns in Suquamish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Suquamish, September typically has an average temperature of 16°C (62°F), with highs reaching up to 28°C (83°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec434146505661666661534843
Data source: Temperature data for Suquamish 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 Suquamish

In Suquamish in September, the precipitation amount is 84 mm (3.3 in) during 13 days, indicating a relatively wet period for that time of year.

September Precipitation Trends in Suquamish

The chart displays monthly precipitation patterns in Suquamish, 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 Suquamish, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec163142111966965262584136168179
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Suquamish

In Suquamish in September, humidity is 74%. With an average temperature of 16°C (62°F), this humidity feels like a warm, heavy blanket enveloping you, making it slightly uncomfortable for traveling as it can lead to a sticky sensation that may sap your energy during outdoor activities.

September Average Humidity in Suquamish

This chart illustrates the average monthly humidity levels in Suquamish, 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 Suquamish is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Suquamish

In Suquamish 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 Suquamish.

Maximum UV Index Levels in Suquamish for September

The chart shows the monthly maximum UV Index (UVI) for Suquamish 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 Suquamish typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987521
Data source: Suquamish 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 Suquamish Compares to Other Months

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

This table compares monthly weather conditions in Suquamish, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)163 mm (6.4 inches)86%low
February Weather5°C (42°F)142 mm (5.6 inches)84%moderate
March Weather8°C (46°F)111 mm (4.4 inches)85%moderate
April Weather10°C (50°F)96 mm (3.8 inches)83%high
May Weather13°C (56°F)69 mm (2.7 inches)84%very high
June Weather16°C (61°F)65 mm (2.6 inches)84%very high
July Weather19°C (66°F)26 mm (1.0 inches)82%very high
August Weather19°C (67°F)25 mm (1.0 inches)73%very high
September Weather16°C (62°F)84 mm (3.3 inches)74%high
October Weather12°C (53°F)136 mm (5.4 inches)83%moderate
November Weather9°C (48°F)168 mm (6.6 inches)86%low
December Weather6°C (43°F)179 mm (7.1 inches)87%low

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