Washington · NWS SEW office

Sammamish, WA weather

It is 45°F at EW6690 Maple Valley as of Oct 27, 10:46 PM PDT. Tonight: Light Rain, low near 42°F, 86% chance of precipitation. Forecast from the National Weather Service, issued Oct 27, 12:41 PM PDT.

Updated Oct 27, 11:21 PM PDT (snapshot)

Current conditions

Temperature

45°F

Light Rain

Wind

SE 2 mph, gusts 6 mph

Humidity 100%

Pressure · visibility

29.87 inHg

Visibility —

Observed at EW6690 Maple Valley (E6690), Oct 27, 10:46 PM PDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Sammamish forecast zone right now.

Around the NWS SEW forecast area

No active alerts in zones served by the SEW office near Sammamish.

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. Washington has 5 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Sammamish (local time)
TimeTempForecastPrecip. chanceWind
Tue 11 PM45°FLight Rain86%S 8 mph
Wed 12 AM45°FLight Rain85%S 8 mph
Wed 1 AM45°FLight Rain Likely68%S 8 mph
Wed 2 AM45°FChance Light Rain53%S 7 mph
Wed 3 AM45°FChance Light Rain48%S 7 mph
Wed 4 AM45°FChance Light Rain42%SSW 7 mph
Wed 5 AM44°FLight Rain Likely64%SSW 6 mph
Wed 6 AM44°FLight Rain Likely60%S 6 mph
Wed 7 AM44°FLight Rain Likely56%SSW 6 mph
Wed 8 AM44°FChance Light Rain52%SSW 6 mph
Wed 9 AM42°FChance Light Rain52%SSW 6 mph
Wed 10 AM44°FLight Rain Likely57%SSW 6 mph
Wed 11 AM46°FChance Light Rain51%SSW 6 mph
Wed 12 PM47°FLight Rain Likely55%SSW 6 mph
Wed 1 PM48°FLight Rain Likely58%SSW 5 mph
Wed 2 PM49°FLight Rain Likely61%SSW 5 mph
Wed 3 PM50°FLight Rain Likely68%SSW 5 mph
Wed 4 PM49°FLight Rain Likely56%SSW 3 mph
Wed 5 PM49°FLight Rain Likely58%S 3 mph
Wed 6 PM47°FLight Rain Likely60%S 3 mph
Wed 7 PM44°FChance Light Rain49%S 3 mph
Wed 8 PM43°FChance Light Rain33%SSE 3 mph
Wed 9 PM42°FMostly Cloudy14%SSE 3 mph
Wed 10 PM41°FMostly Cloudy14%SSE 3 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Sammamish can differ.

7-day forecast

Tonight

Low 42°F

Rain. Cloudy. Low around 42, with temperatures rising to around 44 overnight. South southwest wind around 8 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.

Wednesday

High 51°F·Low 37°F

Rain likely. Mostly cloudy. High near 51, with temperatures falling to around 49 in the afternoon. South southwest wind around 6 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.

Wednesday Night: Rain likely. Mostly cloudy. Low around 37, with temperatures rising to around 39 overnight. Southeast wind around 3 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.

Thursday

High 53°F·Low 37°F

A slight chance of rain before 11am, then patchy fog between 11am and 1pm. Partly sunny, with a high near 53. East northeast wind around 2 mph. Chance of precipitation is 20%.

Thursday Night: A chance of rain after 11pm. Mostly cloudy, with a low around 37. East northeast wind around 1 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

Friday

High 51°F·Low 34°F

A chance of rain before 11am. Partly sunny, with a high near 51. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

Friday Night: Mostly cloudy, with a low around 34.

Saturday

High 53°F·Low 36°F

A slight chance of rain after 5pm. Partly sunny, with a high near 53.

Saturday Night: A slight chance of rain before 4am. Mostly cloudy, with a low around 36.

Sunday

High 53°F·Low 36°F

Partly sunny, with a high near 53.

Sunday Night: Partly cloudy, with a low around 36.

Monday

High 56°F·Low 38°F

Partly sunny, with a high near 56.

Monday Night: Mostly cloudy, with a low around 38.

Tuesday

High 58°F

Partly sunny, with a high near 58.

Nearby cities

Larger cities in the area

Other cities in King County

See every city we cover in Washington, or check all active alerts.

About this forecast

Forecast office
Sammamish is served by the National Weather Service SEW forecast office, forecast zone WAZ307, county zone WAC033.
Location used
The Census Bureau's internal point for Sammamish (47.5943, -122.0381), in King County. Population: 66,474 (2024 estimate), number 19 of the 58 Washington cities on this site.
Radar
Nearest NWS radar: KATX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/47.5943,-122.0381 (forecast issued Oct 27, 12:41 PM PDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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