Climate in Mercer Island (Washington State), United States of America

The graphs below show the monthly weather averages over the year.

Average day and night temperature

The mean minimum and maximum temperatures over the year.

Average monthly minimum and maximum temperature in Mercer Island, the United States of America

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Monthly hours of sunshine

The average monthly total hours of sunshine over the year

Average monthly hours of sunshine in Mercer Island, the United States of America

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* Data from: Seattle, the United States of America (15 KM, 9 Miles).

Daily percent of sunshine

The mean percent of hours of sunhours during the day over the year

Average monthly percentage of sunshine in Mercer Island, the United States of America

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* Data from: Seattle, the United States of America (15 KM, 9 Miles).

Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc.

Average monthly rainfall, snow, precipitation in Mercer Island, the United States of America

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Monthly rainy days

The average number of days each month with rain, snow, hail etc.

Average monthly rainy days in Mercer Island, the United States of America

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Average humidity

The mean monthly relative humidity over the year

Average monthly relative humidity in Mercer Island, the United States of America

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* Data from: Seattle, the United States of America (15 KM, 9 Miles).

Average wind speed

The mean monthly wind speed over the year (in meters per second)

Average monthly wind speed in Mercer Island, the United States of America

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* Data from: Seattle, the United States of America (15 KM, 9 Miles).

Weather Forecasts for Mercer Island (WA)

Thu   Mar 28
12°C | 5°C
S 14 km/h
14 mm
overcast and heavy rain

overcast and heavy rain

Fri   Mar 29
15°C | 7°C
N 14 km/h
1.2 mm
almost clear and small chance of slight rain

almost clear and small chance of slight rain

Sat   Mar 30
15°C | 6°C
NW 11 km/h
partly cloudy and no rain

partly cloudy and no rain

The best time of year to visit Mercer Island in the United States of America

During the months of June, July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:

  • Which months have the greatest rainfall in Mercer Island?
    Most rainfall (rainy season) is seen in November and December.
  • Which is the warmest month in Mercer Island?
    August has an average maximum temperature of 25°C and is the warmest month of the year.
  • Which is the coldest month in Mercer Island?
    The coldest month is December with an average maximum temperature of 8°C.
  • Which is the wettest month in Mercer Island?
    November tops the wettest month list with 168 mm of rainfall.
  • Which is the driest month in Mercer Island?
    July is the driest month with 15 mm of precipitation.
  • Which is the sunniest month in Mercer Island?
    July is the sunniest month with an average of 312 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.