Temperatures in April
It's cool to moderate in April in Mercer Island with an average temperature of 16°C. Temperatures this month range from a low of 13°C to a high of 22°C. At night, you can expect temperatures between 6°C and 10°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Mercer Island in April. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of April
The month of April starts in Mercer Island with cool temperatures, averaging around 16°C during the day and nights close to 8°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-April
By mid-April, the average daytime temperature stays the same at 16°C, with nights close to 8°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of April
By the end of April, the average daytime temperature in Mercer Island will be around 17°C, with nights close to 9°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 April
In April, there is an average of 138 mm of precipitation, spread over 11 days. Of the total precipitation, about 1,1 cm falls as snow in April. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 35% per day this month. The weather’s variable. There are also a few days with lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in April 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 April |
London | ||
|---|---|---|---|
 Average Temperature |
16°C | 15°C | |
 High Temp |
22°C | 18°C | |
| Low Temp |
13°C | 12°C | |
 Total Precipitation |
138 mm | 29 mm | |
| Rainy Days |
11 days | 7 days | |
 Total Snowfall |
1,1 cm | 0 cm | |
| Snowy Days |
1 day | 0 days | |
March
UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is April a good time to visit Mercer Island?
Looking for sun and warm weather? Then April isn’t the best time to be in Mercer Island. The temperature is too low this month for a warm stay.
Temperature records for Mercer Island in April
With 31°C, Mercer Island hit the highest temperature in the last 10 years in April 2016. The lowest daytime temperature in this month was 7°C in 2022. The extreme night temperatures ranged from a low of 0°C to a high of 14°C.
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Daily Temperature in April in Mercer Island
This chart shows the average daily temperatures, both day and night, for each day in April 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 April in Mercer Island
The chart below shows the average daily precipitation in April 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 April, you can expect around 11 days of rain in Mercer Island.
Daily Snowfall in April in Mercer Island
This chart shows the average daily snowfall in April in Mercer Island, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in April.
Daily UV Index in April in Mercer Island
This chart shows the average daily UV index in April 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 April in Mercer Island Over the Years
This chart shows the average temperature in April in Mercer Island, measured in degrees Celsius, over the past years.
Total Precipitation in April in Mercer Island Over the Years
This chart shows the average precipitation in April in Mercer Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in April in Mercer Island per year
This chart shows the average snowfall in April in Mercer Island, measured in centimetres, over the past years.
Daily climate in April for Mercer Island
Click on a specific day in April 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 April 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.
Or check out the climate of Mercer Island for all months at once
