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September Weather in Everett, United States

Last updated: June 24, 2025

In Everett, United States, the average temperature in September hovers around 20°C (68°F). Expect a minimum chill of 3°C (37°F) and a warm maximum of 34°C (93°F). During this month, precipitation averages 124 mm (4.9 in) over 10 days, contributing to an average humidity level of 68%. Prepare for a mix of temperatures and occasional rain!

September Temperature in Everett

In September, in Everett, the average temperature is 20°C (68°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (37°F). This makes Everett a great destination for travelers looking to enjoy mild weather with the possibility of warm afternoons and cool evenings.

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

The chart illustrates September temperature patterns in Everett, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Everett, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec313541516270767468574236
Data source: Temperature data for Everett 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 Everett

In Everett in September, the precipitation amount is 124 mm (4.9 in) spread over a duration of 10 days.

September Precipitation Trends in Everett

The chart displays monthly precipitation patterns in Everett, 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 Everett, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6110188105124101107931241097092
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Everett

In Everett in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Everett

This chart illustrates the average monthly humidity levels in Everett, 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 Everett is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Everett

In Everett 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 Everett.

Maximum UV Index Levels in Everett for September

The chart shows the monthly maximum UV Index (UVI) for Everett 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 Everett typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108743
Data source: Everett 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 Everett Compares to Other Months

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

This table compares monthly weather conditions in Everett, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)61 mm (2.4 inches)86%moderate
February Weather2°C (35°F)101 mm (4.0 inches)86%moderate
March Weather5°C (41°F)88 mm (3.5 inches)86%high
April Weather11°C (52°F)105 mm (4.1 inches)84%very high
May Weather17°C (62°F)124 mm (4.9 inches)78%very high
June Weather21°C (70°F)101 mm (4.0 inches)79%very high
July Weather25°C (76°F)107 mm (4.2 inches)70%very high
August Weather23°C (74°F)93 mm (3.6 inches)59%very high
September Weather20°C (68°F)124 mm (4.9 inches)68%very high
October Weather14°C (57°F)109 mm (4.3 inches)80%high
November Weather5°C (42°F)70 mm (2.8 inches)86%moderate
December Weather2°C (36°F)92 mm (3.6 inches)85%moderate

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