May weather forecast and climate
Olympia, WA

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

Weather in May

The last month of the spring, May, is an enjoyable month in Olympia, Washington, with average temperature ranging between max 65.7°F (18.7°C) and min 41.9°F (5.5°C).

Temperature

In May, the average high-temperature marginally rises, from a mild 57°F (13.9°C) in April, to an enjoyable 65.7°F (18.7°C). In Olympia, in May, the average low-temperature is 41.9°F (5.5°C).

Humidity

The average relative humidity in May is 77%.

Rainfall

In Olympia, during May, the rain falls for 13.5 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 177.4 rainfall days, and 37.05" (941mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In May, the average length of the day in Olympia is 15.1h.

Sunshine

In Olympia, the average sunshine is 8.1h.

UV index

In Olympia, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
[Resources]

FAQ

What is the temperature in May in Olympia?

In May, in Olympia, the average high-temperature is 65.7°F (18.7°C), and the average low-temperature is 41.9°F (5.5°C).

What is the average humidity in May in Olympia?

In Olympia, the average relative humidity in May is 77%.

How much does it rain in Olympia in May?

In May, the rain falls for 13.5 days. Throughout May, 1.77" (45mm) of precipitation is accumulated.

When it does not snow in Olympia?

April through October are months without snowfall in Olympia.

How many hours of daylight does Olympia have in May?

In Olympia, the average length of the day in May is 15.1h.

How long on average sun shines in May in Olympia?

In May, the average sunshine is 8.1h.

What is the UV index reading in May in Olympia?

In Olympia, Washington, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in May
Olympia, WA

Average temperature in May - Olympia, WA
  • Average high temperature in May: 65.7°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (43°F).

  • Average low temperature in May: 41.9°F

The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).

[Resources]

Average pressure in May
Olympia, WA

Average pressure in May - Olympia, WA
  • Average pressure in May: 30.04"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is March (30.01").

[Resources]

Average wind speed in May
Olympia, WA

Average wind speed in May - Olympia, WA
  • Average wind speed in May: 4.3mph

The windiest months (with the highest average wind speed) are March and November (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).

[Resources]

Average humidity in May
Olympia, WA

Average humidity in May - Olympia, WA
  • Average humidity in May: 77%

Months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is July (71%).

[Resources]

Average rainfall in May
Olympia, WA

Average rainfall in May - Olympia, WA
  • Average rainfall in May: 1.77"

The wettest month (with the highest rainfall) is December (5.79").
The driest month (with the least rainfall) is July (0.39").

[Resources]

Average rainfall days in May
Olympia, WA

Average rainfall days in May - Olympia, WA
  • Average rainfall days in May: 13.5 days

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (5.5 days).

[Resources]

Average snowfall in May
Olympia, WA

Average snowfall in May - Olympia, WA
  • Average snowfall in May: 0"

The month with the highest snowfall is February (2.32").
Months with the least snowfall are April, May, June, July, August, September and October (0").

[Resources]

Average snowfall days in May
Olympia, WA

Average snowfall days in May - Olympia, WA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (3.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average daylight in May /
Average sunshine in May
Olympia, WA

Average daylight in May / Average sunshine in May - Olympia, WA
  • Average daylight in May: 15.1h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in May: 8.1h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is December (Average sunshine: 3.4h).

[Resources]

Average sunshine days in May
Olympia, WA

Average sunshine days in May - Olympia, WA
  • Average sunshine days in May: 15.8 days

The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.4 days).

[Resources]

Average UV index in May
Olympia, WA

Average UV index in May - Olympia, WA
  • Average UV index in May: 4

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

[Resources]

Average cloud cover in May
Olympia, WA

Average cloud cover in May - Olympia, WA
  • Average cloud cover in May: 53

Months with the most cloud cover are January and December (Cloud cover 65).
Months with the least cloud cover are July and August (Cloud cover 35).

[Resources]

Average visibility in May
Olympia, WA

Average visibility in May - Olympia, WA
  • Average visibility in May: 4mi

Months with the highest visibility are June, July and August (5mi).
Months with the lowest visibility are January, February, March, April, May, September, October, November and December (4mi).

[Resources]