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September Weather in McChord Air Force Base, United States

Last updated: June 24, 2025

In September, the average temperature in McChord Air Force Base, United States hovers around 17°C (63°F), with a range that can dip to a chilly 8°C (46°F) and soar up to a warm 30°C (86°F). Expect a total precipitation of 83 mm (3.3 in) over 10 days, coupled with an average humidity of 74%.

September Temperature in McChord Air Force Base

In September in McChord Air Force Base, the average temperature is 17°C (63°F). Maximums can reach 30°C (86°F), and minimums can be as low as 8°C (46°F). This climate makes McChord Air Force Base an ideal destination for travelers seeking mild weather with the possibility of warm sunny days.

September Weather in McChord Air Force Base: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in McChord Air Force Base, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McChord Air Force Base, September typically has an average temperature of 17°C (63°F), with highs reaching up to 30°C (86°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec434246505762676762534743
Data source: Temperature data for McChord Air Force Base 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 McChord Air Force Base

In McChord Air Force Base in September, the total precipitation amount is 83 mm (3.3 in) over a span of 10 days.

September Precipitation Trends in McChord Air Force Base

The chart displays monthly precipitation patterns in McChord Air Force Base, 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 McChord Air Force Base, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec169151116102534681283123167184
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in McChord Air Force Base

In McChord Air Force Base in September, humidity is 74%. With an average temperature of 17°C (63°F), this humidity feels like a gentle embrace, making outdoor exploration comfortable yet slightly enveloped in warmth, perfect for leisurely strolls but requiring ample hydration for prolonged activities.

September Average Humidity in McChord Air Force Base

This chart illustrates the average monthly humidity levels in McChord Air Force Base, 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 McChord Air Force Base 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 McChord Air Force Base

In McChord Air Force Base 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 McChord Air Force Base.

Maximum UV Index Levels in McChord Air Force Base for September

The chart shows the monthly maximum UV Index (UVI) for McChord Air Force Base 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 McChord Air Force Base typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: McChord Air Force Base 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 McChord Air Force Base Compares to Other Months

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

This table compares monthly weather conditions in McChord Air Force Base, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)168 mm (6.6 inches)86%low
February Weather5°C (42°F)151 mm (6.0 inches)84%moderate
March Weather8°C (46°F)116 mm (4.6 inches)85%moderate
April Weather10°C (50°F)102 mm (4.0 inches)83%high
May Weather14°C (57°F)53 mm (2.1 inches)84%very high
June Weather17°C (62°F)46 mm (1.8 inches)84%very high
July Weather19°C (67°F)8 mm (0.3 inches)82%very high
August Weather20°C (68°F)11 mm (0.5 inches)73%very high
September Weather17°C (63°F)83 mm (3.3 inches)74%high
October Weather12°C (53°F)123 mm (4.9 inches)83%moderate
November Weather9°C (48°F)167 mm (6.6 inches)86%moderate
December Weather6°C (43°F)184 mm (7.2 inches)87%low

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