Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
In April, the average high-temperature marginally rises from a fresh 50.5°F (10.3°C) in March to a moderate 55.9°F (13.3°C). In April, the average low-temperature is 39.7°F (4.3°C).Humidity
The average relative humidity in April in Mercer Island is 79%.Rainfall
In Mercer Island, in April, it is raining for 12.3 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, in Mercer Island, there are 119.1 rainfall days, and 11.97" (304mm) of precipitation is accumulated.Snowfall
In Mercer Island, snow does not fall through October.Daylight
In Mercer Island, the average length of the day in April is 13h and 40min.On the first day of April, sunrise is at 6:47 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:53 am and sunset at 8:19 pm PDT.
Sunshine
The average sunshine in April in Mercer Island is 8.1h.UV index
In April, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In April, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
FAQ
What is the temperature in April in Mercer Island?
What is the average humidity in April in Mercer Island?
How many days does it rain in April in Mercer Island?
When it does not snow in Mercer Island?
Does it snow in Mercer Island in April?
How many hours of daylight does Mercer Island have in April?
When is the sunrise / sunset in April in Mercer Island?
How long on average sun shines in April in Mercer Island?
What is the UV index intensity in April in Mercer Island?
Average temperature in April
Mercer Island, WA
- Average high temperature in April: 55.9°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.8°F).
- Average low temperature in April: 39.7°F
The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is February (34.5°F).
Average pressure in April
Mercer Island, 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
Mercer Island, WA
- Average wind speed in April: 4.5mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in April
Mercer Island, WA
- Average humidity in April: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in April
Mercer Island, WA
- Average rainfall in April: 1.06"
The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in April
Mercer Island, WA
- Average rainfall days in April: 12.3 days
The month with the highest number of rainy days is March (13.7 days).
The month with the least rainy days is August (4.1 days).
Average snowfall in April
Mercer Island, WA
- Average snowfall in April: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in April
Mercer Island, WA
- Average snowfall days in April: 0.1 days
The month with the highest number of snowfall days is February (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in April /
Average sunshine in April
Mercer Island, WA
- Average daylight in April: 13h and 40min
The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 31min).
- Average sunshine in April: 8h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in April
Mercer Island, WA
- Average sunshine days in April: 14.8 days
The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is February (13.8 days).
Average UV index in April
Mercer Island, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Mercer Island, WA
- Average cloud cover in April: 50
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in April
Mercer Island, WA
- Average visibility in April: 5mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
Weather forecast for your location
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