Mercer Island Weather in May
With daytime temperatures of 18°C (64°F) and nighttime lows of 9°C (48°F), May in Mercer Island brings pleasant temperatures during the day. Some rainfall is to be expected during the month.
Rainfall in Mercer Island in May
Records from the past 30 years suggest around 12 days of rain, with 56 mm (2.2 in) average for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Mercer Island in May
In May, Mercer Island gets pleasant temperatures, with highs of 18°C (64°F). Nights cool to around 9°C (48°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Mercer Island in May
Expect sunny days throughout the month, with an estimated 254 hours of sunshine. This makes it a pleasant time to visit Mercer Island.
Wind Speed in Mercer Island in May
In May, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.If you prefer enjoying temperate temperatures and rain-free days, June, July, August and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Mercer Island's climate page.
Mercer Island Temperature in May
Min Temperature
9°C (48°F)
Max Temperature
18°C (64°F)
Chance of Rain
40%
Precipitation
56 mm (2.2 in)
Rainy days
12 days
Humidity
68% *
Windspeed
4 m/s (8 knots) *
Sunshine
254 hours *
Percentage Sunshine
54% *
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Mercer Island in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Mercer Island in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Mercer Island's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Mercer Island climate overview or explore weather in the United States of America.
