May weather forecastWest Lake Sammamish, WA
May
Weather in May
The last month of the spring, May, is an enjoyable month in West Lake Sammamish, Washington, with an average temperature fluctuating between 64.4°F (18°C) and 42.6°F (5.9°C).Temperature
In West Lake Sammamish, the onset of May comes with a modest high-temperature shift, transitioning from April's refreshing 55.8°F (13.2°C) to an enjoyable 64.4°F (18°C). Despite substantial daily fluctuations, the average low-temperature is an icy 42.6°F (5.9°C) during May.Humidity
In West Lake Sammamish, the average relative humidity in May is 75%.Rainfall
In May, the rain falls for 10.5 days. Throughout May, 0.79" (20mm) of precipitation is accumulated. In West Lake Sammamish, during the entire year, the rain falls for 136.7 days and collects up to 13.39" (340mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in May is 15h and 10min.On the first day of the month, sunrise is at 5:49 am and sunset at 8:21 pm. On the last day of May, sunrise is at 5:14 am and sunset at 8:57 pm PDT.
Sunshine
In May, the average sunshine is 9h.UV index
In West Lake Sammamish, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: An average UV index of 4 in May transforms into this advice:
Ensure safety - Sun damage prevention is strongly urged. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
West Lake Sammamish, WA
- Average high temperature in May: 64.4°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in May: 42.6°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).
Average pressure in May
West Lake Sammamish, WA
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in May
West Lake Sammamish, WA
- Average wind speed in May: 3.8mph
The windiest month (with the highest average wind speed) is January (5mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in May
West Lake Sammamish, WA
- Average humidity in May: 75%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (70%).
Average rainfall in May
West Lake Sammamish, WA
- Average rainfall in May: 0.79"
The wettest month (with the highest rainfall) is December (1.85").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in May
West Lake Sammamish, WA
- Average rainfall days in May: 10.5 days
The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (5.2 days).
Average snowfall in May
West Lake Sammamish, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
West Lake Sammamish, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in May /
Average sunshine in May
West Lake Sammamish, WA
- Average daylight in May: 15h and 12min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in May
West Lake Sammamish, WA
- Average sunshine days in May: 17.7 days
The month with the most sunshine days is August (24 days).
The month with the least sunshine days is November (13.5 days).
Average UV index in May
West Lake Sammamish, WA
- Average UV index in May: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
West Lake Sammamish, WA
- Average cloud cover in May: 44
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in May
West Lake Sammamish, WA
- Average visibility in May: 5mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).
