June weather forecastMercer Island, WA
June
Weather in June
June, the first month of the summer in Mercer Island, is a pleasant month, with an average temperature varying between 47.5°F (8.6°C) and 69.3°F (20.7°C).Temperature
Mercer Island's average high-temperature in June is a pleasant 69.3°F (20.7°C), indicating a subtle variation from May. Despite drastic daily temperature oscillations, Mercer Island cools down to an average low-temperature of 47.5°F (8.6°C) in June.Humidity
In Mercer Island, Washington, the average relative humidity in June is 74%.Rainfall
In June, in Mercer Island, the rain falls for 8.9 days. Throughout June, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 119.1 rainfall days, and 11.97" (304mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
With an average of 15h and 54min of daylight, June has the longest days of the year.On the first day of the month, sunrise is at 5:14 am and sunset at 8:59 pm. On the last day of June, sunrise is at 5:15 am and sunset at 9:10 pm PDT.
Sunshine
The average sunshine in June in Mercer Island is 9.4h.UV index
In June, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 5 during June translates into the following directions:
Take precautions - Protection against sun damage is advised. Avoiding the Sun during its peak radiation time around midday is a healthy practice. 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 June
Mercer Island, WA
- Average high temperature in June: 69.3°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 June: 47.5°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 June
Mercer Island, WA
- Average pressure in June: 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 June
Mercer Island, WA
- Average wind speed in June: 3.7mph
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 June
Mercer Island, WA
- Average humidity in June: 74%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in June
Mercer Island, WA
- Average rainfall in June: 0.63"
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 June
Mercer Island, WA
- Average rainfall days in June: 8.9 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 June
Mercer Island, WA
- Average snowfall in June: 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 June
Mercer Island, WA
- Average snowfall days in June: 0 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 June /
Average sunshine in June
Mercer Island, WA
- Average daylight in June: 15h and 54min
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 June: 9h and 24min
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 June
Mercer Island, WA
- Average sunshine days in June: 18.8 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 June
Mercer Island, WA
- Average UV index in June: 5
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 June
Mercer Island, WA
- Average cloud cover in June: 43
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 June
Mercer Island, WA
- Average visibility in June: 6mi
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).
