Olympia
Washington, USA
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Olympia, WA

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The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington
The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington
  • The average high temperature in May: 65.3°F

The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (44.2°F).

  • The average low temperature in May: 43.1°F

The month with the highest average low temperature is July (50.8°F).
The coldest month (with the lowest average low temperature) is December (32.6°F).

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  • The average humidity in May: 72.9%

The month with the highest relative humidity is December (89.1%).
The month with the lowest relative humidity is July (70.8%).

  • The average rainfall in May: 2.3"

The wettest month (with the highest rainfall) is November (8.6").
The driest month (with the lowest rainfall) is July (0.6").

  • The average rainfall days in May: 12.5 days

The month with the highest number of rainy days is November (20.1 days).
The month with the lowest number of rainy days is July (4.6 days).

  • The average snowfall in May: 0"

The month with the highest snowfall is February (4.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

  • The average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (2.2 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • The average daylight in May: 15h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in May: 8h

The month with most sunshine is July (Average sunshine: 10h).
Months with least sunshine are January and December (Average sunshine: 2).

  • The average UV index in May: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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