Current Weather Forecast for Mercer Island

WA 98040  |   5:04pm

Weather Conditions

54°

Feels Like 52°

Sunny

35° 55°

1

UV Index

Good

Air Quality

SW 6 mph

Wind

0 in

rain

Tonight

Thu 3/26

33°

Lowest Temperature

3%

Mainly clear. Low 33F. Winds light and variable.

Tomorrow

Fri 3/27

57°

Highest Temperature

3%

Partly cloudy. High 57F. Winds N at 5 to 10 mph.

Tomorrow night

Fri 3/27

39°

Lowest Temperature

8%

Cloudy. Low 39F. Winds light and variable.

Next 12 Hours Next 7 Days

Next 12 Hours Forecast in Mercer Island

Hourly Weather Forecast & Temperature

6PM

53°

Feels Like 52°

Sunny

SW 5 mph

Wind

1033 mb

Pressure

38%

Humidity

0

UV Index

10mi

Visibility

11%

Cloud Cover

7PM

1%

51°

Feels Like 51°

Sunny

NE 3 mph

Wind

1033 mb

Pressure

45%

Humidity

0

UV Index

10mi

Visibility

10%

Cloud Cover

8PM

1%

47°

Feels Like 47°

Mostly Clear

NE 1 mph

Wind

1033 mb

Pressure

54%

Humidity

0

UV Index

10mi

Visibility

20%

Cloud Cover

9PM

1%

45°

Feels Like 45°

Mostly Clear

NE 2 mph

Wind

1033 mb

Pressure

59%

Humidity

0

UV Index

10mi

Visibility

27%

Cloud Cover

10PM

1%

44°

Feels Like 44°

Mostly Clear

ENE 3 mph

Wind

1033 mb

Pressure

62%

Humidity

0

UV Index

10mi

Visibility

25%

Cloud Cover

11PM

1%

42°

Feels Like 42°

Mostly Clear

ENE 2 mph

Wind

1032 mb

Pressure

66%

Humidity

0

UV Index

10mi

Visibility

21%

Cloud Cover

12AM

2%

40°

Feels Like 40°

Mostly Clear

ENE 2 mph

Wind

1031 mb

Pressure

68%

Humidity

0

UV Index

10mi

Visibility

20%

Cloud Cover

1AM

3%

39°

Feels Like 39°

Mostly Clear

NE 1 mph

Wind

1031 mb

Pressure

71%

Humidity

0

UV Index

10mi

Visibility

29%

Cloud Cover

2AM

3%

38°

Feels Like 38°

Mostly Clear

NE 1 mph

Wind

1030 mb

Pressure

73%

Humidity

0

UV Index

10mi

Visibility

20%

Cloud Cover

3AM

3%

37°

Feels Like 37°

Clear

NE 2 mph

Wind

1029 mb

Pressure

76%

Humidity

0

UV Index

10mi

Visibility

18%

Cloud Cover

4AM

4%

36°

Feels Like 36°

Partly Cloudy

NE 2 mph

Wind

1029 mb

Pressure

79%

Humidity

0

UV Index

10mi

Visibility

46%

Cloud Cover

5AM

4%

35°

Feels Like 35°

Partly Cloudy

NE 2 mph

Wind

1028 mb

Pressure

80%

Humidity

0

UV Index

10mi

Visibility

51%

Cloud Cover

Thu 3/26

Thu

3%

35°

55°

Mostly clear. Lows overnight in the low 30s.

33°

Feels Like

NE 4 mph

Wind

64%

Humidity

0

UV Index

6:59 AM

Sunrise

7:30 PM

Sunset

Fri 3/27

Fri

3%

33°

57°

Times of sun and clouds. Highs in the upper 50s and lows in the upper 30s.

34°

Feels Like

N 9 mph

Wind

54%

Humidity

4

UV Index

6:57 AM

Sunrise

7:31 PM

Sunset

Sat 3/28

Sat

8%

39°

55°

More clouds than sun. Highs in the mid 50s and lows in the upper 30s.

40°

Feels Like

N 5 mph

Wind

68%

Humidity

2

UV Index

6:55 AM

Sunrise

7:32 PM

Sunset

Sun 3/29

Sun

47%

37°

49°

Chance of afternoon showers. Highs in the upper 40s and lows in the mid 30s.

39°

Feels Like

S 5 mph

Wind

68%

Humidity

2

UV Index

6:53 AM

Sunrise

7:34 PM

Sunset

Mon 3/30

Mon

36%

34°

49°

Showers ending by midday. Highs in the upper 40s and lows in the low 30s.

35°

Feels Like

NNE 6 mph

Wind

67%

Humidity

4

UV Index

6:51 AM

Sunrise

7:35 PM

Sunset

Tue 3/31

Tue

8%

33°

55°

Partly cloudy. Highs in the mid 50s and lows in the low 40s.

34°

Feels Like

N 5 mph

Wind

57%

Humidity

4

UV Index

6:49 AM

Sunrise

7:37 PM

Sunset

Wed 4/1

Wed

76%

41°

49°

Light rain. Highs in the upper 40s and lows in the upper 30s.

41°

Feels Like

SSE 7 mph

Wind

80%

Humidity

3

UV Index

6:47 AM

Sunrise

7:38 PM

Sunset

Thu 4/2

Thu

65%

38°

47°

Showers. Highs in the upper 40s and lows in the upper 30s.

36°

Feels Like

SSW 7 mph

Wind

84%

Humidity

3

UV Index

6:45 AM

Sunrise

7:40 PM

Sunset

Need to see beyond 12 Hours?

Find more forecast on the FREE FOX WEATHER App

GO TO APP STORE

Looking for homes in this area?

• 7439 W Mercer Way, Mercer Island, WA 98040
• 2800 68th Ave SE, Mercer Island, WA 98040
• 3712 88th Ave SE, Mercer Island, WA 98040

Sponsored by Redfin. Housing data supplied by Redfin independent of FOX Weather.

Latest Stories from Washington

Here are the top 10 most popular national parks across America

America loves its national parks and with 63 of them across the country, there are so many to see. A new report lists the top 10 most-visited national parks in the U.S. in 2025.

Pacific Northwest faces rising flood and avalanche risks as atmospheric river continues to pummel region

A powerful ongoing atmospheric river is moving across the Pacific Northwest, increasing the risk of flash flooding and avalanches. This comes just days after a storm system caused torrential rain and feet of snow to fall in Washington, Oregon, Idaho and Montana.

At least 1 dead, more than 87,000 without power as atmospheric river blasts Northwest

A powerful atmospheric river is intensifying across the Northwest and is expected to bring more heavy rain and potentially flash flooding, as well as feet of mountain snow to Washington, Oregon, Idaho and Montana.

Allergy season is worse than ever. Here are the 10 worst allergy capitals in the US for 2026

Allergy sufferers in the U.S. might've felt it for a while, but a new report shows that pollen allergy season is more intense and longer-lasting than ever.

Load More Stories