nomadseason

September Weather in Stanwood, United States

Last updated: June 24, 2025

In September, the average temperature in Stanwood, United States is a pleasant 19°C (67°F). Visitors can expect a temperature range from a cool 2°C (36°F) to a warm 33°C (92°F). During this month, precipitation averages around 130 mm (5.1 in) over 10 days, contributing to an average humidity of 78%, making it a wonderfully refreshing time to experience the locale!

September Temperature in Stanwood

In September in Stanwood, the average temperature is 19°C (67°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 2°C (36°F). This range makes it a great time to visit for those who enjoy mild weather but should be prepared for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Stanwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stanwood, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec212338486173767267523730
Data source: Temperature data for Stanwood generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Stanwood

In Stanwood in September, the precipitation amount is 130 mm (5.1 in) over a period of 10 days.

September Precipitation Trends in Stanwood

The chart displays monthly precipitation patterns in Stanwood, 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 Stanwood, September typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4859738414312079881301304946
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Stanwood

In Stanwood in September humidity is 78%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel both sticky and sluggish as you navigate through the day.

September Average Humidity in Stanwood

This chart illustrates the average monthly humidity levels in Stanwood, 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 Stanwood is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%81%82%78%81%79%77%78%79%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stanwood

In Stanwood 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 Stanwood.

Maximum UV Index Levels in Stanwood for September

The chart shows the monthly maximum UV Index (UVI) for Stanwood 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 Stanwood typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Stanwood 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 Stanwood Compares to Other Months

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

This table compares monthly weather conditions in Stanwood, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)48 mm (1.9 inches)81%moderate
February Weather-5°C (23°F)59 mm (2.3 inches)81%moderate
March Weather3°C (38°F)73 mm (2.9 inches)81%high
April Weather9°C (48°F)84 mm (3.3 inches)82%very high
May Weather16°C (62°F)143 mm (5.6 inches)78%very high
June Weather23°C (73°F)120 mm (4.7 inches)81%extreme
July Weather24°C (76°F)79 mm (3.1 inches)79%very high
August Weather22°C (72°F)88 mm (3.5 inches)77%very high
September Weather19°C (67°F)130 mm (5.1 inches)78%very high
October Weather11°C (53°F)130 mm (5.1 inches)78%high
November Weather3°C (38°F)49 mm (1.9 inches)87%moderate
December Weather-1°C (30°F)46 mm (1.8 inches)84%moderate

Compare Stanwood's Climate with Cities Worldwide