May weather forecast and climate
Sunnyside, WA

Weather in May

The last month of the spring, May, is a pleasant month in Sunnyside, Washington, with average temperature varying between 70.3°F (21.3°C) and 48.7°F (9.3°C).

Temperature

In May, the average high-temperature rises, from a mild 60.4°F (15.8°C) in April, to an agreeable 70.3°F (21.3°C). In May, in Sunnyside, the average low-temperature is 48.7°F (9.3°C).

Humidity

The average relative humidity in Sunnyside is 50%.

Rainfall

The month with the most rainfall in Sunnyside is May when the rain falls for 10.3 days and typically aggregates up to 1.1" (28mm) of precipitation.

Snowfall

April through August and October are months without snowfall.

Daylight

In Sunnyside, the average length of the day is 15h.

Sunshine

The average sunshine in Sunnyside is 10.7h.

UV index

In May, the average daily maximum UV index in Sunnyside is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.
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FAQ

What is the average humidity in May in Sunnyside?

The average relative humidity in May in Sunnyside is 50%.

What is the wettest month in Sunnyside?

The month with the most rainfall is May when the rain falls for 10.3 days and typically aggregates up to 1.1" (28mm) of precipitation.

How much does it rain in Sunnyside in May?

In Sunnyside, Washington, during May, the rain falls for 10.3 days and regularly aggregates up to 1.1" (28mm) of precipitation.

When it does not snow in Sunnyside?

In Sunnyside snow does not fall in April through August and October.

What is the average length of the day in May in Sunnyside?

In May, the average length of the day is 15h.

How many hours of sunshine does Sunnyside have in May?

In Sunnyside, the average sunshine in May is 10.7h.

What is the UV index intensity in May in Sunnyside?

In Sunnyside, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in May
Sunnyside, WA

Average temperature in May - Sunnyside, WA
  • Average high temperature in May: 70.3°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (36.1°F).

  • Average low temperature in May: 48.7°F

The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (25.3°F).

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Average pressure in May
Sunnyside, WA

Average pressure in May - Sunnyside, WA
  • Average pressure in May: 29.96"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is August (29.92").

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Average wind speed in May
Sunnyside, WA

Average wind speed in May - Sunnyside, WA
  • Average wind speed in May: 7.5mph

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5mph).

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Average humidity in May
Sunnyside, WA

Average humidity in May - Sunnyside, WA
  • Average humidity in May: 50%

The month with the highest relative humidity is January (83%).
Months with the lowest relative humidity are July and August (38%).

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Average rainfall in May
Sunnyside, WA

Average rainfall in May - Sunnyside, WA
  • Average rainfall in May: 1.1"

The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in May
Sunnyside, WA

Average rainfall days in May - Sunnyside, WA
  • Average rainfall days in May: 10.3 days

The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (4.1 days).

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Average snowfall in May
Sunnyside, WA

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

The month with the highest snowfall is December (2.24").
Months with the least snowfall are April, May, June, July, August and October (0").

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Average snowfall days in May
Sunnyside, WA

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

The month with the highest number of snowfall days is December (5 days).
Months with the least snowfall days are April, May, June, July, August and October (0 days).

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

Average daylight in May / Average sunshine in May - Sunnyside, WA
  • Average daylight in May: 15h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in May: 10.7h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 4.9h).

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Average sunshine days in May
Sunnyside, WA

Average sunshine days in May - Sunnyside, WA
  • Average sunshine days in May: 18.7 days

The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is March (15.4 days).

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Average UV index in May
Sunnyside, WA

Average UV index in May - Sunnyside, WA
  • Average UV index in May: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Sunnyside, WA

Average cloud cover in May - Sunnyside, WA
  • Average cloud cover in May: 28

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in May
Sunnyside, WA

Average visibility in May - Sunnyside, WA
  • Average visibility in May: 6mi

Months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January and December (5mi).

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