Spokane
Washington, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Spokane, WA

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  • The average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (83°F).
The month with the lowest average high temperature is December (32.2°F).

  • The average low temperature in September: 47.4°F

The month with the highest average low temperature is July (56.3°F).
The coldest month (with the lowest average low temperature) is December (22.5°F).

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  • The average humidity in September: 53.9%

The month with the highest relative humidity is December (85.5%).
The month with the lowest relative humidity is July (44%).

  • The average rainfall in September: 0.7"

Wettest months (with the highest rainfall) are November and December (2.3").
Driest months (with the lowest rainfall) are July and August (0.6").

  • The average rainfall days in September: 5.1 days

The month with the highest number of rainy days is November (13.7 days).
The month with the lowest number of rainy days is August (3.8 days).

  • The average snowfall in September: 0"

The month with the highest snowfall is December (14.6").
Months with the lowest snowfall are June, July, August and September (0").

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (9.8 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

  • The average daylight in September: 13h

Months with the longest days are June and July (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8h).

  • The average sunshine in September: 9h

The month with most sunshine is July (Average sunshine: 12.3h).
The month with least sunshine is December (Average sunshine: 1.9h).

  • The average UV index in September: 5

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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