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September Weather in Tulalip Bay, United States

Last updated: June 24, 2025

In September, the average temperature in Tulalip Bay, United States hovers around 15°C (60°F). Expect a minimum of 8°C (47°F) and a maximum soaring to 30°C (86°F). Visitors should be prepared for 114 mm (4.5 in) of precipitation over 12 days, accompanied by an average humidity of 62%. Enjoy the diverse weather on your journey!

September Temperature in Tulalip Bay

In September in Tulalip Bay, the average temperature is 15°C (60°F). Maximums can reach 30°C (86°F), and minimums can be as low as 8°C (47°F). This range makes Tulalip Bay a comfortable destination for travelers seeking mild weather and a pleasant outdoor experience.

September Weather in Tulalip Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Tulalip Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tulalip Bay, September typically has an average temperature of 15°C (60°F), with highs reaching up to 30°C (86°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec424044495559636460514641
Data source: Temperature data for Tulalip Bay 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 Tulalip Bay

In Tulalip Bay in September, the precipitation amount is 114 mm (4.5 in) spread over 12 days.

September Precipitation Trends in Tulalip Bay

The chart displays monthly precipitation patterns in Tulalip Bay, 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 Tulalip Bay, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec21920916513887823133114196254247
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tulalip Bay

In Tulalip Bay in September, humidity is 62%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, making it a bit muggy for traveling, yet pleasantly refreshing for leisurely strolls and outdoor exploration.

September Average Humidity in Tulalip Bay

This chart illustrates the average monthly humidity levels in Tulalip Bay, 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 Tulalip Bay is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tulalip Bay

In Tulalip Bay 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 Tulalip Bay.

Maximum UV Index Levels in Tulalip Bay for September

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

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

This table compares monthly weather conditions in Tulalip Bay, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)219 mm (8.6 inches)86%low
February Weather4°C (40°F)209 mm (8.2 inches)86%moderate
March Weather7°C (44°F)165 mm (6.5 inches)87%moderate
April Weather9°C (49°F)138 mm (5.4 inches)84%high
May Weather13°C (55°F)87 mm (3.4 inches)81%very high
June Weather15°C (60°F)81 mm (3.2 inches)82%very high
July Weather17°C (64°F)31 mm (1.2 inches)79%very high
August Weather18°C (65°F)33 mm (1.3 inches)63%very high
September Weather15°C (60°F)114 mm (4.5 inches)62%high
October Weather11°C (51°F)196 mm (7.7 inches)83%moderate
November Weather8°C (46°F)254 mm (10.0 inches)89%low
December Weather5°C (42°F)247 mm (9.7 inches)88%low

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