Mercer Island Weather Conditions
Current Temperature Level
18 °C
13 AQI
Air quality index is: Good
Last Updated: 2025-08-07 02:00 (Local Time)
MapMercer Island
Mercer Island Weather Parameters
5 km/h
2 m/s
146° SE
100 %
16 km
0 mm
1020 mb
UV Index0
Suggestions for
TodayMercer Island7 Aug.
Umbrella• Optional
Clothing• Layering Must
Driving• Drive Safely
Sunscreen• ApplyMercer Island 10-Days Weather Forecast
Today
17°C
79 %Friday
17°C73 %Saturday
18°C70 %Sunday
20°C61 %Monday
21°C68 %Tuesday
22°C62 %Wednesday
21°C69 %Thursday
17°C67 %Friday
13°C89 %Saturday
14°C90 %Overcast
Fully overcast skies with a high of 17 °C. Humidity will be 79%, and winds at 7.6 km/h.21°C / 13°C
Humi.79 %
Prec.0 mm
Sunrise
05:55 AM14hrs 38min
Sunset
08:33 PMTime
Condition
Temp
Humidity
UV
Wind Speed & Dir.
12 AM
Overcast
17 °C
94 %
0
6.5 kmph / SSE
Overcast 
Feels 17.3 °C
Cover 100 %
Visibility 2 km
1 AM
Mist
17 °C
94 %
0
5.8 kmph / SSE
MistFeels 16.9 °C
Cover 100 %
Visibility 2 km
2 AM
Overcast
18 °C
75 %
0
5 kmph / SSE
OvercastFeels 16.4 °C
Cover 100 %
Visibility 16 km
3 AM
Overcast
16 °C
94 %
0
3.2 kmph / SSE
Overcast Feels 16 °C
Cover 100 %
Visibility 2 km
4 AM
Overcast
16 °C
93 %
0
2.2 kmph / SE
Overcast Feels 15.6 °C
Cover 100 %
Visibility 10 km
5 AM
Overcast
15 °C
93 %
0
3.6 kmph / ENE
Overcast Feels 15.5 °C
Cover 100 %
Visibility 10 km
6 AM
Overcast
15 °C
94 %
0
6.1 kmph / ENE
Overcast Feels 15.4 °C
Cover 100 %
Visibility 2 km
7 AM
Overcast
15 °C
92 %
0
6.5 kmph / E
Overcast Feels 15 °C
Cover 91 %
Visibility 10 km
8 AM
Overcast
15 °C
91 %
0.1
4.7 kmph / ESE
Overcast Feels 14.9 °C
Cover 97 %
Visibility 2 km
9 AM
Overcast
15 °C
90 %
0.2
2.5 kmph / E
Overcast Feels 15.2 °C
Cover 95 %
Visibility 2 km
10 AM
Overcast
16 °C
86 %
0.5
2.5 kmph / ENE
Overcast Feels 15.9 °C
Cover 90 %
Visibility 10 km
11 AM
Cloudy
17 °C
79 %
1.2
1.8 kmph / E
Cloudy Feels 16.6 °C
Cover 80 %
Visibility 10 km
12 PM
Cloudy
18 °C
75 %
4.4
3.6 kmph / SE
Cloudy Feels 17.6 °C
Cover 75 %
Visibility 10 km
1 PM
Cloudy
19 °C
69 %
5.5
1.4 kmph / SSW
Cloudy Feels 18.6 °C
Cover 68 %
Visibility 10 km
2 PM
Cloudy
20 °C
64 %
5
4.7 kmph / NW
Cloudy Feels 19.5 °C
Cover 67 %
Visibility 10 km
3 PM
Partly Cloudy
20 °C
61 %
4
5.8 kmph / NNW
Partly Cloudy Feels 20.3 °C
Cover 62 %
Visibility 10 km
4 PM
Partly Cloudy
21 °C
59 %
3.1
5.8 kmph / N
Partly Cloudy Feels 20.7 °C
Cover 39 %
Visibility 10 km
5 PM
Partly Cloudy
21 °C
59 %
1.7
6.1 kmph / N
Partly Cloudy Feels 20.9 °C
Cover 34 %
Visibility 10 km
6 PM
Partly Cloudy
21 °C
59 %
0.8
6.8 kmph / NW
Partly Cloudy Feels 20.7 °C
Cover 28 %
Visibility 10 km
7 PM
Partly Cloudy
20 °C
61 %
0.3
7.6 kmph / NW
Partly Cloudy Feels 19.7 °C
Cover 30 %
Visibility 10 km
8 PM
Partly Cloudy
18 °C
65 %
0
5.8 kmph / NNW
Partly Cloudy Feels 18.3 °C
Cover 37 %
Visibility 10 km
9 PM
Partly Cloudy
17 °C
72 %
0
6.1 kmph / N
Partly Cloudy Feels 16.8 °C
Cover 45 %
Visibility 10 km
10 PM
Partly Cloudy
15 °C
79 %
0
5 kmph / NNE
Partly Cloudy Feels 15 °C
Cover 36 %
Visibility 10 km
11 PM
Clear
14 °C
76 %
0
3.2 kmph / NE
Clear Feels 14.4 °C
Cover 13 %
Visibility 10 km
Today
17°C79 %Friday
17°C73 %Saturday
18°C70 %Sunday
20°C61 %Monday
21°C68 %Tuesday
22°C62 %Wednesday
21°C69 %Thursday
17°C67 %Friday
13°C89 %Saturday
14°C90 %Temp16 °C
ConditionOvercast
Humidity94 %
Feels16 °C
Cover100 %
Visibility2 km
Wind Speed & Dir.3.2 kmph / SSE
UV0
Mercer Island 30-Days (August 2025) Weather Forecast
Sun.
Mon.
Tue.
Wed.
Thu.
Fri.
Sat.
1Fri.
27°17 °C
2Sat.
21°16 °C
3Sun.
20°16 °C
4Mon.
21°16 °C
5Tue.
24°16 °C
6Wed.
23°16 °C
7Today
22°13 °C
8Fri.
24°13 °C
9Sat.
26°13 °C
10Sun.
28°13 °C
11Mon.
31°16 °C
12Tue.
30°16 °C
13Wed.
28°16 °C
14Thu.
22°14 °C
15Fri.
14°12 °C
16Sat.
17°12 °C
17Sun.
23°13 °C
18Mon.
25°12 °C
19Tue.
22°10 °C
20Wed.
26°14 °C
21Thu.
25°14 °C
22Fri.
25°14 °C
23Sat.
25°13 °C
24Sun.
25°13 °C
25Mon.
26°13 °C
26Tue.
25°13 °C
27Wed.
26°13 °C
28Thu.
26°14 °C
29Fri.
24°13 °C
30Sat.
23°13 °C
31Sun.
22°13 °C
AugustWeather Overview
No. of days:
Sunny
6
Cloudy
3
Rainy
18
Snowy
0
The monthly weather averages in Mercer Island consist of 6 sunny days, 3 cloudy days, 18 rainy days, and 0 snowy days.
Mercer Island's Locations Weather Conditions
United States's Hottest Cities - August 2025
1.
Surprise, United States
Partly Cloudy
10%
0
7.9 kmph / WNW
2.
Sun City, United States
Partly Cloudy
10%
0
7.9 kmph / WNW
3.
Guadalupe, United States
Clear
17%
0
10.8 kmph / W
4.
Phoenix, United States
Clear
17%
0
10.8 kmph / W
5.
Tolleson, United States
Clear
17%
0
10.8 kmph / W
6.
Tempe, United States
Clear
17%
0
9 kmph / WNW
7.
Blythe, United States
Clear
10%
0
6.8 kmph / SSW
8.
Scottsdale, United States
Clear
22%
0
7.9 kmph / WNW
9.
Salton City, United States
Clear
24%
0
19.1 kmph / W
10.
North Shore, United States
Clear
24%
0
14 kmph / WNW
Last Updated: 07 Aug 2025, 09:26 AM
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