Average temperature in Mercer Island (WA)

The mean minimum and maximum temperatures over the year in Mercer Island (Washington State), the United States of America.

Average monthly minimum and maximum temperature in Mercer Island (WA),

The months of June, July, August and September have nice average temperatures.
On average, the warmest month is August with 25°C.
On average, the coolest month is December with 8°C.
The average annual maximum temperature is 16°C.
The average annual minimum temperature is 7°C.

Weather Forecasts for Mercer Island (WA)

Sat Apr 27

13°C | 9°C

18 km/h

4 mm

overcast and rain

hourly forecast

Sun Apr 28

12°C | 7°C

18 km/h

1.5 mm

overcast and rain

hourly forecast

Mon Apr 29

12°C | 6°C

11 km/h

12 mm

broken clouds and rain

hourly forecast

5-Day Forecast 10-Day Forecast

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