Weather in Mercer Island, United States 🇺🇸
Weather Forecast in Mercer Island
In Mercer Island right now it is 22°C and sunny, feeling like 24°C. Humidity is 57% with winds around 8 km/h, and the UV index is 5 (moderate). Over the next few days, temperatures in Mercer Island range from about 14°C to 35°C. ⚠️ Heat Advisory issued July 19 at 9:10PM PDT until July 22 at 11:00PM PDT by NWS Seattle WA
Hourly Forecast for Mercer Island
14-Day Forecast for Mercer Island
Sunny
Sunny
Sunny
Sunny
Sunny
Sunny
Cloudy
Patchy rain nearby
Sunny
Partly Cloudy
Sunny
Sunny
Sunny
Sunny
Additional Forecasts for Mercer Island
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Historical Weather
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Best Time to Be Outside in Mercer Island Today
The most comfortable window in Mercer Island today looks like 20:00 to 20:00, when it is around 29°C. It should stay dry through that window. No significant rain is expected in the next several hours.
Frequently Asked Questions about Weather in Mercer Island
What is the temperature in Mercer Island right now?
The current temperature in Mercer Island is 22°C (72°F), sunny (feels like 24°C).
What's the weather like in Mercer Island right now?
Conditions in Mercer Island right now: Sunny, humidity 57%, wind 8 km/h NNW.
What is today's forecast for Mercer Island?
Today in Mercer Island: high 35°C, low 14°C, sunny. Chance of rain: 2%.
What is the 7-day weather forecast for Mercer Island?
Daily highs and lows for Mercer Island:
- 2026-07-20: 35°C / 14°C
- 2026-07-21: 34°C / 15°C
- 2026-07-22: 34°C / 16°C
- 2026-07-23: 32°C / 15°C
- 2026-07-24: 28°C / 11°C
- 2026-07-25: 26°C / 11°C
- 2026-07-26: 25°C / 12°C
Is it going to rain in Mercer Island today?
There is a 2% chance of rain in Mercer Island today.
What is the wind speed in Mercer Island right now?
Wind in Mercer Island is currently 8 km/h (5 mph) from the NNW.
What is the UV index in Mercer Island right now?
The UV index in Mercer Island is currently 4.8 (moderate). Sun protection is recommended when the index is 3 or higher.
