West Richland
Washington, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
West Richland, WA

The last month of the spring, May, is a pleasant month in West Richland, Washington, with average temperature fluctuating between 50.7°F (10.4°C) and 73°F (22.8°C).

Temperature

In May, the average high-temperature increases, from a comfortable 63.3°F (17.4°C) in April, to an agreeable 73°F (22.8°C). The average low-temperature, in West Richland, is 50.7°F (10.4°C).

Humidity

In West Richland, the average relative humidity is 48%.

Rainfall

In West Richland, Washington, during May, the rain falls for 8.8 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 100.2 rainfall days, and 7.05" (179mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in West Richland.

Daylight

The average length of the day is 15h.

Sunshine

The average sunshine in West Richland is 11.1h.

UV index

In May, the average daily maximum UV index in West Richland, Washington, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.

What is the temperature in May in West Richland?

The average high-temperature, in May, in West Richland, is 73°F (22.8°C), while the average low-temperature is 50.7°F (10.4°C).

What is the average humidity in May in West Richland?

The average relative humidity in May in West Richland, Washington, is 48%.

How many days does it rain in May in West Richland?

In May, in West Richland, the rain falls for 8.8 days. Throughout May, 0.67" (17mm) of precipitation is accumulated.

When it does not snow in West Richland?

April through October are months without snowfall in West Richland.

What is the average length of the day in May in West Richland?

The average length of the day in May in West Richland is 15h.

How many hours of sunshine does West Richland have in May?

In May, the average sunshine in West Richland, Washington, is 11.1h.

What is the UV index reading in May in West Richland?

In West Richland, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in May - West Richland, WA
  • Average high temperature in May: 73°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.1°F).

  • Average low temperature in May: 50.7°F

The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (27.5°F).

Average humidity in May - West Richland, WA
  • Average humidity in May: 48%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is July (35%).

Average rainfall in May - West Richland, WA
  • Average rainfall in May: 0.67"

The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and September (0.2").

Average rainfall days in May - West Richland, WA
  • Average rainfall days in May: 8.8 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is July (3.5 days).

Average snowfall in May - West Richland, WA
  • Average snowfall in May: 0"

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

Average snowfall days in May - West Richland, WA
  • Average snowfall days in May: 0 days

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

Average daylight in May / Average sunshine in May - West Richland, 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: 11.1h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 5.4h).

Average UV index in May - West Richland, WA
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 2).