Current Conditions

Mercer Island, Washington

61°F16°C
Clear

Wind

SSE 3 mph5 km/h

Humidity

89%

Cloud Cover

41%

As of Thursday, August 13, 2026 at 5:57 AM PDT

Today's Outlook

Day

Partly cloudy and warm, with a high of 79°F26°C and morning low of 63°F17°C. Light wind from the W around 3 mph5 km/h.

Night

Mostly clear, with a low around 61°F16°C. Light wind from the ENE around 3 mph5 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
ClearHigh 79°F26°CLow 61°F16°CPrecip 0 in0 mmCloud 28%Wind W 3 mph5 km/hThursday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 63°F17°C. Light wind from the W around 3 mph5 km/h. Thursday Night: Mostly clear, with a low around 61°F16°C. Light wind from the ENE around 3 mph5 km/h.
ClearHigh 77°F25°CLow 61°F16°CPrecip 0 in0.1 mm4%Cloud 38%Wind SW 4 mph6 km/hFriday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 63°F17°C. Light wind from the SW around 4 mph7 km/h. Friday Night: Partly cloudy, with a low around 61°F16°C. Light wind from the SW around 3 mph6 km/h.
Partly CloudyHigh 77°F25°CLow 62°F16°CPrecip 0 in0.1 mm5%Cloud 57%Wind WSW 3 mph5 km/hSaturday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 62°F17°C. Light wind from the WSW around 3 mph5 km/h. Saturday Night: Partly cloudy, with a low around 62°F16°C. Light wind from the SW around 3 mph5 km/h.
Partly CloudyHigh 77°F25°CLow 61°F16°CPrecip 0 in0.1 mm1%Cloud 63%Wind NW 3 mph5 km/hSunday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 62°F17°C. Light wind from the NW around 3 mph5 km/h. Sunday Night: Mostly cloudy, with a low around 61°F16°C. Light wind from the NNW around 3 mph5 km/h.
Partly CloudyHigh 79°F26°CLow 60°F16°CPrecip 0 in0 mmCloud 52%Wind NNW 3 mph5 km/hMonday: Mostly cloudy and warm, with a high of 79°F26°C and morning low of 62°F17°C. Light wind from the NW around 3 mph5 km/h. Monday Night: Mostly cloudy, with a low around 60°F16°C. Light wind from the NNE around 3 mph5 km/h.
Partly CloudyHigh 74°F23°CLow 61°F16°CPrecip 0.01 in0.2 mm2%Cloud 64%Wind SSW 5 mph7 km/hTuesday: Mostly cloudy and warm, with a high of 74°F23°C and morning low of 62°F17°C. Light wind from the SW around 5 mph8 km/h. Tuesday Night: Mostly cloudy, with a low around 61°F16°C. Light wind from the SSW around 4 mph7 km/h.
Partly CloudyHigh 75°F24°CLow 60°F16°CPrecip 0.01 in0.2 mm5%Cloud 54%Wind WNW 4 mph6 km/hWednesday: Mostly cloudy and warm, with a high of 75°F24°C and morning low of 62°F17°C. Light wind from the WNW around 4 mph6 km/h. Wednesday Night: Partly cloudy, with a low around 60°F16°C. Light wind from the SE around 3 mph5 km/h.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
ThursdayAug 1379°F26°C61°F16°C0 in0 mm· —28%ClearW 3 mph5 km/h
FridayAug 1477°F25°C61°F16°C0 in0.1 mm· 4%38%ClearSW 4 mph6 km/h
SaturdayAug 1577°F25°C62°F16°C0 in0.1 mm· 5%57%Partly CloudyWSW 3 mph5 km/h
SundayAug 1677°F25°C61°F16°C0 in0.1 mm· 1%63%Partly CloudyNW 3 mph5 km/h
MondayAug 1779°F26°C60°F16°C0 in0 mm· —52%Partly CloudyNNW 3 mph5 km/h
TuesdayAug 1874°F23°C61°F16°C0.01 in0.2 mm· 2%64%Partly CloudySSW 5 mph7 km/h
WednesdayAug 1975°F24°C60°F16°C0.01 in0.2 mm· 5%54%Partly CloudyWNW 4 mph6 km/h
ThursdayAug 2076°F25°C60°F16°C0.02 in0.4 mm· 6%47%Partly CloudyNW 4 mph6 km/h
FridayAug 2176°F24°C61°F16°C0.02 in0.5 mm· 9%46%Partly CloudySW 5 mph7 km/h
SaturdayAug 2274°F24°C61°F16°C0.05 in1.3 mm· 20%58%DrizzleSW 5 mph8 km/h
SundayAug 2374°F23°C60°F16°C0.06 in1.5 mm· 20%52%DrizzleWSW 4 mph7 km/h
MondayAug 2475°F24°C59°F15°C0.03 in0.7 mm· 14%40%DrizzleNW 4 mph7 km/h
TuesdayAug 2576°F24°C59°F15°C0.02 in0.4 mm· 8%34%ClearNW 4 mph7 km/h
WednesdayAug 2676°F24°C59°F15°C0.02 in0.5 mm· 10%35%DrizzleNW 4 mph6 km/h
ThursdayAug 2775°F24°C58°F15°C0.02 in0.5 mm· 9%37%ClearNW 4 mph7 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

PatternExampleDescription
/weather/{country}/{city}//weather/united-states/san-francisco/City forecast (canonical URL)
/weather/{city}//weather/tokyo/Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}//weather/united-states/california/san-francisco/With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}/weather/nearby?lat=48.1&lon=11.5Find nearest city by coordinates
/weather/{country}//weather/germany/Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 47.5707°N, 122.2221°W·Elevation: 102m·Timezone: America/Los_Angeles·Population: 25,042