May weather forecast
Kelso, WA

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Weather in May

The last month of the spring, May, is a refreshing month in Kelso, Washington, with temperature in the range of an average high of 64.8°F (18.2°C) and an average low of 40.8°F (4.9°C).

Temperature

In Kelso, the average high-temperature in May slightly rises, from a refreshing 55.9°F (13.3°C) in April, to a comfortable 64.8°F (18.2°C). Kelso demonstrates a significant disparity from daytime highs throughout the month of May, with an average nighttime temperature of 40.8°F (4.9°C).

Humidity

In May, the average relative humidity in Kelso is 78%.

Rainfall

In May, the rain falls for 13.9 days. Throughout May, 1.61" (41mm) of precipitation is accumulated. Throughout the year, in Kelso, there are 175.5 rainfall days, and 25.83" (656mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In Kelso, the average length of the day in May is 15h and 0min.
On the first day of the month, sunrise is at 5:56 am and sunset at 8:20 pm. On the last day of May, sunrise is at 5:23 am and sunset at 8:55 pm PDT.

Sunshine

In Kelso, the average sunshine in May is 7.9h.

UV index

In Kelso, Washington, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 4 in May, converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

What are May temperatures in Kelso?

The high-temperature in Kelso, Washington, during May is 64.8°F (18.2°C) and the low-temperature is 40.8°F (4.9°C).

What is the average humidity in May in Kelso?

The average relative humidity in May in Kelso is 78%.

How many days does it rain in May in Kelso?

In Kelso, in May, during 13.9 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.

When it does not snow in Kelso?

In Kelso, snow does not fall in April through October.

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

The average day length in May in Kelso, Washington, is 15h and 0min.

When is the sunrise / sunset in May in Kelso?

On the first day of May in Kelso, Washington, sunrise is at 5:56 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:55 pm PDT.

How long on average sun shines in May in Kelso?

In Kelso, Washington, the average sunshine duration in May is 7.9h.

How high is the UV index in May in Kelso?

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Kelso, WA

Average temperature in May - Kelso, WA
  • Average high temperature in May: 64.8°F

The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (42.3°F).

  • Average low temperature in May: 40.8°F

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).

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Average pressure in May
Kelso, WA

Average pressure in May - Kelso, WA
  • Average pressure in May: 30.04"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed in May
Kelso, WA

Average wind speed in May - Kelso, WA
  • Average wind speed in May: 4.2mph

The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).

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Average humidity in May
Kelso, WA

Average humidity in May - Kelso, WA
  • Average humidity in May: 78%

The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is July (72%).

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Average rainfall in May
Kelso, WA

Average rainfall in May - Kelso, WA
  • Average rainfall in May: 1.61"

The wettest month (with the highest rainfall) is January (3.9").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days in May
Kelso, WA

Average rainfall days in May - Kelso, WA
  • Average rainfall days in May: 13.9 days

The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.1 days).

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Average snowfall in May
Kelso, WA

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

The month with the highest snowfall is January (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Kelso, WA

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

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

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

Average daylight in May / Average sunshine in May - Kelso, WA
  • Average daylight in May: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in May: 7h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 30min).

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Average sunshine days in May
Kelso, WA

Average sunshine days in May - Kelso, WA
  • Average sunshine days in May: 15.3 days

The month with the most sunshine days is July (22 days).
The month with the least sunshine days is March (8.9 days).

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Average UV index in May
Kelso, WA

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

The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).

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Average cloud cover in May
Kelso, WA

Average cloud cover in May - Kelso, WA
  • Average cloud cover in May: 55

The months with the most cloud cover are February and March (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 36).

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Average visibility in May
Kelso, WA

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

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

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Kelso, Washington, USA

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