Temperatures in March
It's cool in March in Mercer Island with an average temperature of 13°C. Temperatures this month range from a low of 10°C to a high of 15°C. At night, you can expect temperatures between 3°C and 8°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Mercer Island in March. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of March
The month of March starts in Mercer Island with cool temperatures, averaging around 12°C during the day and nights close to 4°C. Plenty of days with a chance of precipitation.
Mid-March
By mid-March, the average daytime temperature rises to around 14°C, with nights close to 6°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of March
By the end of March, the average daytime temperature in Mercer Island will be around 14°C, with nights close to 7°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in March
In March, there is an average of 148 mm of precipitation, spread over 12 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 39% per day this month. The weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in March for Mercer Island. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Mercer Island in March |
London | ||
|---|---|---|---|
 Average Temperature |
13°C | 11°C | |
 High Temp |
15°C | 14°C | |
| Low Temp |
10°C | 8°C | |
 Total Precipitation |
148 mm | 55 mm | |
| Rainy Days |
12 days | 9 days | |
February
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is March a good time to visit Mercer Island?
After some sun? Then March isn’t the best time to be in Mercer Island. There’s too much chance of rain this month.
Temperature records for Mercer Island in March
With 27°C, Mercer Island hit the highest temperature in the last 10 years in March 2019. The lowest daytime temperature in this month was 5°C in 2019. The extreme night temperatures ranged from a low of -3°C to a high of 12°C.
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Daily Temperature in March in Mercer Island
This chart shows the average daily temperatures, both day and night, for each day in March in Mercer Island, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in March in Mercer Island
The chart below shows the average daily precipitation in March for Mercer Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for March, you can expect around 12 days of rain in Mercer Island.
Daily UV Index in March in Mercer Island
This chart shows the average daily UV index in March in Mercer Island, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in March in Mercer Island Over the Years
This chart shows the average temperature in March in Mercer Island, measured in degrees Celsius, over the past years.
Total Precipitation in March in Mercer Island Over the Years
This chart shows the average precipitation in March in Mercer Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in March for Mercer Island
Click on a specific day in March for detailed info on the typical weather on that day in Mercer Island. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in March in Mercer Island
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Share your weather experience in March in Mercer Island.
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.
Or check out the climate of Mercer Island for all months at once
