April weather forecastWest Lake Sammamish, WA
April
Weather in April
April is a moderate spring month in West Lake Sammamish, Washington, with an average temperature varying between 38.8°F (3.8°C) and 55.8°F (13.2°C).Temperature
April's arrival signals a subtle increase in average high-temperatures, moving from March's cool 50°F (10°C) to a refreshing 55.8°F (13.2°C). Nighttime temperatures hover around an average low of 38.8°F (3.8°C) in April.Humidity
In West Lake Sammamish, the average relative humidity in April is 80%.Rainfall
In West Lake Sammamish, Washington, during April, the rain falls for 14 days and regularly aggregates up to 1.22" (31mm) of precipitation. Throughout the year, there are 136.7 rainfall days, and 13.39" (340mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. April is the last month it regularly snows. During 0.4 snowfall days, in April, West Lake Sammamish aggregates 0.12" (3mm) of snow. In West Lake Sammamish, during the entire year, snow falls for 9.3 days and aggregates up to 3.27" (83mm) of snow.Daylight
In West Lake Sammamish, the average length of the day in April is 13h and 40min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of April, in West Lake Sammamish, sunrise is at 5:51 am and sunset at 8:19 pm PDT.
Sunshine
The average sunshine in April in West Lake Sammamish is 7.9h.UV index
In April, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: An average UV index of 3 in April transforms into this advice:
Exercise prevention - Precautions against solar damage are endorsed. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
West Lake Sammamish, WA
- Average high temperature in April: 55.8°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 April: 38.8°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 April
West Lake Sammamish, WA
- Average pressure in April: 30.04"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 April
West Lake Sammamish, WA
- Average wind speed in April: 4.3mph
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 April
West Lake Sammamish, WA
- Average humidity in April: 80%
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 April
West Lake Sammamish, WA
- Average rainfall in April: 1.22"
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 April
West Lake Sammamish, WA
- Average rainfall days in April: 14 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 April
West Lake Sammamish, WA
- Average snowfall in April: 0.12"
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 April
West Lake Sammamish, WA
- Average snowfall days in April: 0.4 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 April /
Average sunshine in April
West Lake Sammamish, WA
- Average daylight in April: 13h and 42min
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 April: 7h and 54min
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 April
West Lake Sammamish, WA
- Average sunshine days in April: 13.9 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 April
West Lake Sammamish, WA
- Average UV index in April: 3
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 April
West Lake Sammamish, WA
- Average cloud cover in April: 52
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 April
West Lake Sammamish, WA
- Average visibility in April: 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).
