Mercer Island, WA Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Mercer Island, WA in one place.
Mostly cloudy, with a high near 70. South southwest wind around 9 mph.
Local Weather Overview
This forecast page for Mercer Island, WA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jun 1, 2026 10:23 AM PDT.
The active forecast window currently covers Jun 3 to Jun 7, 2026 for Mercer Island, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 3 to Jun 7, 2026
- Latest sync
- Jun 1, 2026 10:23 AM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercer Island
Wednesday looks like the warmest upcoming period in Mercer Island at 70 degrees F.
Saturday Night is the coolest period ahead with temperatures near 49 degrees F.
The strongest winds are forecast for Friday at about 6 to 10 mph SSW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 1, 2026 10:23 AM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SEW
- Radar station
- KATX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 54.
Partly sunny, with a high near 68.
Mostly cloudy, with a low around 52.
A chance of rain after 5pm. Partly sunny, with a high near 67.
A chance of rain. Mostly cloudy, with a low around 50.
Rain likely. Mostly cloudy, with a high near 63.
Rain likely. Mostly cloudy, with a low around 49.
A slight chance of rain. Partly sunny, with a high near 67.
A slight chance of rain before 11pm. Mostly cloudy, with a low around 51.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jun 3
|
Mostly Cloudy
|
70°F |
9 mph
SSW
|
|
Wednesday Night
Jun 3
|
Mostly Cloudy
|
54°F |
5 to 9 mph
SW
|
|
Thursday
Jun 4
|
Partly Sunny
|
68°F |
6 mph
SW
|
|
Thursday Night
Jun 4
|
Mostly Cloudy
|
52°F |
6 mph
SW
|
|
Friday
Jun 5
|
Partly Sunny then Chance Light Rain
|
67°F |
6 to 10 mph
SSW
|
|
Friday Night
Jun 5
|
Chance Light Rain
|
50°F |
10 mph
SSW
|
|
Saturday
Jun 6
|
Light Rain Likely
|
63°F |
10 mph
SSW
|
|
Saturday Night
Jun 6
|
Light Rain Likely
|
49°F |
5 to 8 mph
S
|
|
Sunday
Jun 7
|
Slight Chance Light Rain
|
67°F |
6 mph
SSW
|
|
Sunday Night
Jun 7
|
Slight Chance Light Rain then Mostly Cloudy
|
51°F |
2 to 6 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mercer Island.
