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Newcastle, WA Weather
Current conditions, hourly and 10-day forecast from the National Weather Service. Times are local (PDT).
Newcastle, WA current weather
54°F
Cloudy
H -- / L 46°Feels like 54°
Observed at Renton Municipal Airport (3.5 mi away), 10/26/2026, 9:50 PM PDT
Hourly forecast
National Weather Service
Hourly forecast temporarily unavailable
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10-day forecast
Tap a day for details
Today10/2657% chance of precipitationLow 46°High
Tonight: Rain likely. Mostly cloudy. Low around 46, with temperatures rising to around 48 overnight. South southeast wind 2 to 6 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Light Rain LikelyTue10/2794% chance of precipitationLow 45°High 56°
Tuesday: Rain likely. Mostly cloudy. High near 56, with temperatures falling to around 54 in the afternoon. South southwest wind 5 to 13 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
Tuesday Night: Rain. Mostly cloudy. Low around 45, with temperatures rising to around 47 overnight. South southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Light Rain LikelyWed10/2889% chance of precipitationLow 40°High 53°
Wednesday: Rain. Cloudy, with a high near 53. South southwest wind around 8 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Wednesday Night: Rain. Mostly cloudy, with a low around 40. Southeast wind 3 to 7 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Light RainThu10/2967% chance of precipitationLow 39°High 51°
Thursday: Rain likely. Mostly cloudy, with a high near 51. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday Night: A chance of rain. Mostly cloudy, with a low around 39.
Light Rain LikelyFri10/3019% chance of precipitationLow 36°High 52°
Friday: A slight chance of rain before 11am. Partly sunny, with a high near 52.
Friday Night: Mostly cloudy, with a low around 36.
Slight Chance Light Rain then Partly SunnySat10/31Low 37°High 52°
Saturday: Partly sunny, with a high near 52.
Saturday Night: Mostly cloudy, with a low around 37.
Partly SunnySun11/111% chance of precipitationLow 38°High 53°
Sunday: Partly sunny, with a high near 53.
Sunday Night: Mostly cloudy, with a low around 38.
Partly SunnyMon11/218% chance of precipitationLow High 56°
Monday: A slight chance of rain between 4pm and 5pm. Partly sunny, with a high near 56.
Partly Sunny then Slight Chance Light RainTue11/3Model blendLow 39°High 58°
Tuesday: Mostly cloudy. High near 58°. Low that night near 39°.
Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.
Wed11/4Model blend23% chance of precipitationLow 41°High 59°
Wednesday: Mostly cloudy. High near 59°. Low that night near 41°.
Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.
Forecast for 47.530, -122.160 from the NWS SEW office, updated 10/26/2026, 4:03 PM PDT · Official forecast on weather.gov
Days 9 to 10: NOAA National Blend of Models, station KRNT (Renton Muni, 4 mi), model run 10/26/2026, 7:00 PM PDT
From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.
Radar and satellite
National radarNEXRAD (last 50 min) and GOES
Nearby hazards
Washington hazardsSevere storm and flash flood outlooks, expected rain, river flooding and wildfires near this area
- Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
- Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
- River gauges within 40 miles at or above flood stage: None reported
- Active wildfires within 50 miles: THREE QUEENS Fire (9,575 acres), KING Fire (3,427 acres), WEST FORK Fire (310 acres), GARDA FALLS Fire (308 acres)
Drought
By countyKing County, week of 10/20/2026
14% of the county is in moderate drought or worse.
Tides nearby
NOAA tide stations
Beaches nearby
EPA BEACON beaches
Frequently asked questions
- What is the weather in Newcastle, WA right now?
- The latest observation from Renton Municipal Airport was 54°F and cloudy, reported at 10/26/2026, 9:50 PM PDT.
- What is the 10-day forecast for Newcastle, WA?
- The first 8 days come from the National Weather Service forecast. Days 9 to 10 (Nov 3 to Nov 4) come from the NOAA National Blend of Models, with highs of 58°F to 59°F. Model guidance this far out often changes.
- What time is sunrise and sunset in Newcastle, WA today?
- Sunrise is about 7:44 AM PDT and sunset is about 6:00 PM PDT (calculated for the center of the area, within a few minutes).
- What is the normal October weather in Newcastle, WA?
- At Renton MUNI AP, the 1991 to 2020 normal high in October is 61°F and the normal low is 46°F.
Sun and moon
Local time, center of the area
- Sunrise
- 7:44 AM
- Sunset
- 6 PM
- Daylight
- 10 hr 17 min
- Moon
- Waning Gibbous 99% lit
- First light (civil dawn)
- 7:12 AM
- Last light (civil dusk)
- 6:32 PM
- Moonrise
- 5:47 PM
- Moonset
- 8:36 AM
Normal October weather
ClimateNormal October high 61°, low 46°, precipitation 3.49 in for the month. 1991 to 2020 normals at Renton MUNI AP, 4 mi away.
Other places nearby
Data sources
- National Weather Service APINOAA
- National Blend of Models (NBM) text guidanceNOAA National Weather Service
- Convective Outlooks and Storm ReportsNOAA Storm Prediction Center
- Excessive Rainfall Outlook and Quantitative Precipitation ForecastsNOAA Weather Prediction Center
- National Water Prediction ServiceNOAA National Weather Service
- WFIGS Current Wildland Fire IncidentsNational Interagency Fire Center
- UV Index Forecast (Envirofacts)U.S. Environmental Protection Agency and NOAA
- AirNowU.S. Environmental Protection Agency
- NWS HeatRisk (experimental)NOAA National Weather Service
- U.S. Drought MonitorNational Drought Mitigation Center, USDA and NOAA
- BEACON 2.0 Beach Advisory and Closing On-line NotificationU.S. Environmental Protection Agency
- U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information
- Tides & Currents (CO-OPS API)NOAA Center for Operational Oceanographic Products and Services
- NEXRAD radar tilesIowa Environmental Mesonet, Iowa State University
- GOES-East and GOES-West GeoColor imageryNOAA NESDIS Center for Satellite Applications and Research
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About this data
Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.
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