Weather in Mercer Island, WA
Updated 2026-08-11 09:15 local time · ZIP codes 98040
Partly cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
61°6% rain
68°5% rain72°4% rain75°3% rain78°2% rain79°2% rain84°1% rain84°1% rain84°1% rain81°1% rain77°1% rain73°2% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 6%).
It feels like 61°F with winds near 2 mph.
73°F, 2% rain chance and 7 mph wind.
Visibility is around 10 mi; gusts may reach 11 mph.
Current temperature is 61°F, wind 2 mph, rain chance up to 6%.
UV index is 2.
Mercer Island weather today
Partly cloudy and 61°F in Mercer Island, WA. Today's high is 84°F with a 4% rain chance. Winds are around 2 mph with gusts near 7 mph. Relative humidity is 77%, pressure is 30.13 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Mercer Island
Sunrise is at 05:59 AM and sunset is at 08:28 PM. Tomorrow's forecast calls for Partly Cloudy with a high near 80°F and a low near 54°F. The maximum rain chance is 7%.