May weather forecastWalla Walla, WA
May
Weather in May
May marks the height of spring in Walla, with temperatures rising and clear skies dominating the weather pattern. Long daylight hours and resplendent sunshine create picturesque days, perfect for outdoor activities. This pleasant month is characterized by sprightly breezes and a noticeable uptick in humidity. The city is in full bloom, with landscapes dancing under the warm sun. With an ascent to a high of 66.2°F (19°C), May's climatic conditions are indicative of the imminent arrival of summer.Temperature
Observing a rise in May, the average high-temperature in Walla goes from April's moderate 56.8°F (13.8°C) to an enjoyable 66.2°F (19°C). Walla sees an average low-temperature of 45.5°F (7.5°C) during May.Humidity
The average relative humidity in May is 62%.Rainfall
In Walla, in May, it is raining for 13.8 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, in Walla, there are 141.7 rainfall days, and 15.12" (384mm) of precipitation is accumulated.Snowfall
May through August and October are months without snowfall in Walla.Daylight
In Walla, Washington, the average length of the day in May is 14h and 59min.On the first day of May in Walla, sunrise is at 5:38 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 5:05 am and sunset at 8:36 pm PDT.
Sunshine
In Walla, the average sunshine in May is 10.9h.UV index
In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: During May, 4 as the daily maximum UV index converts into the following advice:
Ensure safety - Sun damage prevention is strongly urged. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Walla Walla, WA
- Average high temperature in May: 66.2°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (37.4°F).
- Average low temperature in May: 45.5°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in May
Walla Walla, WA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in May
Walla Walla, WA
- Average wind speed in May: 6.7mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).
Average humidity in May
Walla Walla, WA
- Average humidity in May: 62%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in May
Walla Walla, WA
- Average rainfall in May: 1.65"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in May
Walla Walla, WA
- Average rainfall days in May: 13.8 days
The month with the highest number of rainy days is March (17.4 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in May
Walla Walla, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in May
Walla Walla, WA
- Average snowfall days in May: 0 days
The months with the highest number of snowfall days are February and December (6.1 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Walla Walla, 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: 10h and 54min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in May
Walla Walla, WA
- Average sunshine days in May: 14.3 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is February (10 days).
Average UV index in May
Walla Walla, WA
- Average UV index in May: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Walla Walla, WA
- Average cloud cover in May: 27
The months with the most cloud cover are January, February and December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in May
Walla Walla, WA
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
