May weather forecastRichland, WA
May
Weather in May
May brings along mildly warm temperatures, creating the perfect conditions for spending time outdoors. Richland is bathed in nearly 15 hours of daylight every day during this month. The skies clear up substantially, allowing the sun to shine brightly upon the city. However, attention gets diverted to the rising temperatures, escalating humidity, and significant daylight hours. Experiencing a stunning sunset after a perfect sunny day is typical during May.Temperature
The arrival of May brings an increase in high-temperatures, moving from a comfortable 63.3°F (17.4°C) in April to a pleasant 73°F (22.8°C). Despite considerable daily temperature swings, a steady low-temperature average of 50.7°F (10.4°C) is noted throughout May.Humidity
In Richland, the average relative humidity in May is 48%.Rainfall
In May, the rain falls for 8.8 days. Throughout May, 0.67" (17mm) of precipitation is accumulated. 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.Daylight
The average length of the day in May is 15h and 1min.On the first day of the month, sunrise is at 5:41 am and sunset at 8:06 pm. On the last day of May, sunrise is at 5:08 am and sunset at 8:41 pm PDT.
Sunshine
In Richland, the average sunshine in May is 11.1h.UV index
The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 5 during May translates into the following directions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
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 pressure in May
Richland, WA
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in May
Richland, WA
- Average wind speed in May: 7.3mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5.6mph).
Average humidity in May
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
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
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
Richland, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Richland, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is December (3.3 days).
The 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
Richland, 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: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in May
Richland, WA
- Average sunshine days in May: 19.8 days
The month with the most sunshine days is July (25.7 days).
The months with the least sunshine days are February and March (15.3 days).
Average UV index in May
Richland, WA
- Average UV index in May: 5
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
Richland, WA
- Average cloud cover in May: 25
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in May
Richland, 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).
