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Mercer Island Hourly Weather Forecast

Next 48 Hours

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Sat, Mar 14th 2026

Skies will shift from Sunny skies to partly cloudy as the day goes on. Rain forecasted to be patchy rain nearby (up to 0.00in), moderate snow (up to 0.03in). Snow forecasted to be moderate snow (up to 0.20in). Temps range from 33° to 44°. Light winds, shifting from SSE to ESE at 3.3 mph, with humidity ranging 46% to 97%, and an avg barometric pressure of 30.27 inHg.

Temp

Feel

Humidity

Wind

Pressure

Dew Point

Precip.

5 AM

35°F

32°F

95%

3.8 SSE

30.06

34°F

63%

6 AM

35°F

34°F

96%

3.4 SSE

30.02

34°F

7 AM

35°F

34°F

97%

2.5 SSE

30.06

34°F

100%

Rain est. 0.03in

Snow est. 0.2in

8 AM

36°F

32°F

88%

2 SSE

30.15

32°F

85%

9 AM

38°F

33°F

58%

2.2 SE

30.15

24°F

0.1

10 AM

41°F

36°F

50%

3.6 SSE

30.19

23°F

0.4

11 AM

42°F

39°F

58%

4.3 SSE

30.24

30°F

12 PM

43°F

40°F

56%

4 S

30.24

28°F

1.6

1 PM

44°F

41°F

46%

4 S

30.27

25°F

2.3

2 PM

44°F

42°F

46%

3.6 S

30.3

25°F

2.3

3 PM

44°F

43°F

62%

3.1 S

30.32

31°F

1.9

4 PM

43°F

42°F

60%

2.5 SSE

30.32

31°F

1.2

5 PM

43°F

42°F

60%

2.9 SE

30.34

29°F

0.6

6 PM

42°F

41°F

63%

3.8 SE

30.35

31°F

0.2

7 PM

40°F

39°F

64%

4 SE

30.37

30°F

8 PM

39°F

37°F

64%

3.4 SE

30.41

27°F

9 PM

37°F

35°F

69%

3.4 SE

30.44

28°F

10 PM

34°F

31°F

72%

2.9 ESE

30.46

28°F

11 PM

33°F

30°F

93%

2.5 ESE

30.42

28°F

Sun, Mar 15th 2026

Starting off Overcast conditions, turning partly cloudy later in the day. Rain forecasted to be heavy rain at times (up to 0.05in), moderate or heavy rain shower (up to 0.07in), light rain (up to 0.10in). Warming trend from 28°F to 46°. Light winds, shifting from ESE to SW at 3.2 mph, with humidity ranging 38% to 96%, and an avg barometric pressure of 30.38 inHg.

Temp

Feel

Humidity

Wind

Pressure

Dew Point

Precip.

12 AM

32°F

29°F

79%

2.7 ESE

30.48

26°F

1 AM

31°F

27°F

80%

2.7 ESE

30.49

26°F

2 AM

30°F

26°F

81%

2.2 ESE

30.5

25°F

3 AM

30°F

25°F

82%

2.7 ESE

30.49

25°F

4 AM

29°F

25°F

83%

2.2 SE

30.49

24°F

5 AM

29°F

25°F

84%

2.7 SE

30.49

24°F

6 AM

28°F

25°F

84%

2.5 SE

30.48

24°F

7 AM

28°F

25°F

84%

2 SE

30.48

24°F

8 AM

32°F

30°F

84%

2.2 SE

30.48

24°F

0.1

9 AM

36°F

34°F

65%

1.8 SSE

30.44

24°F

0.4

10 AM

40°F

39°F

56%

1.6 S

30.42

24°F

11 AM

43°F

41°F

47%

2 SSE

30.41

24°F

1.8

12 PM

45°F

43°F

42%

3.4 SSE

30.36

24°F

2.3

1 PM

46°F

44°F

40%

3.8 S

30.34

24°F

1.9

2 PM

46°F

43°F

38%

4.9 SSE

30.31

24°F

3 PM

46°F

42°F

45%

5.1 S

30.29

26°F

1.4

4 PM

46°F

41°F

48%

4.9 SSE

30.28

28°F

0.6

5 PM

44°F

39°F

52%

4.5 SE

30.27

29°F

0.3

6 PM

42°F

37°F

74%

4.5 ESE

30.26

33°F

100%

Rain est. 0.05in

7 PM

40°F

35°F

85%

5.6 SE

30.26

35°F

100%

Rain est. 0.07in

8 PM

39°F

34°F

96%

6.7 ESE

30.25

37°F

100%

Rain est. 0.1in

9 PM

39°F

34°F

96%

3.6 ESE

30.22

37°F

100%

Rain est. 0.05in

10 PM

36°F

32°F

95%

1.6 ESE

30.21

38°F

100%

Rain est. 0.02in

11 PM

38°F

33°F

77%

0.9 SW

30.46

27°F

Mon, Mar 16th 2026

Foggy conditions expected later. Rain forecasted to be fog (up to 0.19in). Temps range from 39° to 41°. Light winds from the SE at 4.4 mph, as humidity fluctuates between 96% to 98%, and an avg barometric pressure of 30.12 inHg.

Temp

Feel

Humidity

Wind

Pressure

Dew Point

Precip.

12 AM

39°F

34°F

96%

4.7 SE