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United StatesThe climate of Mercer Island
The current climate in Mercer Island features temperatures ranging from a high of 26°C to a low of 9°C throughout the year. The average yearly temperature is around 17°C. At night, temperatures in the colder months average around 3°C and in the warmer months around 16°C.
Average temperatures and precipitation
This chart shows the average monthly maximum and minimum temperatures (in degrees Celsius) and average monthly rainfall (in millimeters) for Mercer Island, Washington.
Temperature records
The highest temperature recorded in Mercer Island in recent years was 41°C in June 2021. The lowest daytime temperature recorded was -5°C in December 2021.
Precipitation and snowfall
On average, Mercer Island gets 1547 mm of precipitation each year. Of this, about 27 cm is snowfall. For comparison, New York gets 1142 mm of precipitation each year.
Best time to visit Mercer Island?
The best time to visit Mercer Island for sunny weather is May through September. During this period, you'll have nice temperatures and not too much rain, making it a great time to visit Mercer Island. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
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Climate Table of Mercer Island
The climate table of Mercer Island shows the average temperatures, rainfall, snow, and UV index per month. The table provides an overview of the average day and night temperatures in degrees Celsius, the total amount of rainfall in millimeters, the total snowfall in centimeters, and the UV index for each month. Rainfall is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 10 | 10 | 13 | 16 | 20 | 22 | 26 | 26 | 22 | 17 | 11 | 9 |
| Temp. min (°C) | 5 | 4 | 5 | 8 | 11 | 13 | 16 | 16 | 13 | 10 | 6 | 4 |
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| Precipitation (mm) | 196 | 176 | 148 | 138 | 55 | 50 | 9,3 | 15 | 60 | 175 | 267 | 257 |
| Snow (cm) | 1,4 | 9,5 | 0 | 1,2 | 0 | 0 | 0 | 0 | 0 | 0 | 4,8 | 10 |
| UV Index | 1 | 2 | 3 | 3 | 6 | 7 | 7 | 7 | 3 | 2 | 2 | 1 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
Temperature charts
These charts display the average temperatures in Mercer Island, Washington. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Average Temperature per Month in Mercer Island
Yearly Temperature in Mercer Island
Precipitation charts
These charts show the average amount of precipitation in Mercer Island, Washington. Precipitation is always measured as water, even when it falls as snow or hail. The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Average Precipitation per Month in Mercer Island
Total Yearly Precipitation in Mercer Island
Average Snowfall per Month in Mercer Island
Total Yearly Snowfall in Mercer Island
UV index chart
This chart shows the average UV index per month in Mercer Island, Washington. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Average UV Index per Month in Mercer Island
Weather experiences in Mercer Island
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Average weather in Mercer Island by month
Click on a month below to see detailed weather info for Mercer Island. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.