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Prosser, WA 99345 Weather
It is 55°F and mostly clear in Prosser, WA 99345, observed at 2:40 PM PDT. Today: Partly Sunny, high 55°F, low 36°F. Hourly and 10-day forecast from the National Weather Service. Times are local (PDT).
Prosser, WA 99345 current weather
55°F
Mostly Clear
H 55° / L 36°Feels like 55°
Observed at Hermiston, Hermiston Municipal Airport (24.1 mi away), 10/29/2026, 2:40 PM PDT
10-day forecast
Tap a day for details
Today10/29Low 36°High 55°
This Afternoon: Partly sunny, with a high near 55. Northeast wind 5 to 9 mph.
Tonight: Patchy fog after 5am. Mostly cloudy. Low around 36, with temperatures rising to around 39 overnight. Northeast wind 1 to 7 mph.
Partly SunnyFri10/30Low 31°High 54°
Friday: Patchy fog before 11am. Partly sunny. High near 54, with temperatures falling to around 52 in the afternoon. Southwest wind 0 to 9 mph.
Friday Night: Patchy fog after 11pm. Partly cloudy, with a low around 31. Northeast wind around 2 mph.
Patchy Fog then Partly SunnySat10/3119% chance of precipitationLow 34°High 52°
Saturday: Patchy fog before 11am, then a slight chance of rain showers. Mostly cloudy, with a high near 52. North wind around 2 mph. Chance of precipitation is 20%.
Saturday Night: A slight chance of rain showers before 11pm, then patchy fog. Mostly cloudy, with a low around 34. Chance of precipitation is 20%.
Patchy Fog then Slight Chance Rain ShowersSun11/1Low 32°High 55°
Sunday: Patchy fog before 10am. Mostly sunny, with a high near 55.
Sunday Night: Mostly clear, with a low around 32.
Patchy Fog then Mostly SunnyMon11/2Low 34°High 55°
Monday: Mostly sunny, with a high near 55.
Monday Night: Mostly cloudy, with a low around 34.
Mostly SunnyTue11/3Low 33°High 56°
Tuesday: Partly sunny, with a high near 56.
Tuesday Night: Mostly cloudy, with a low around 33.
Partly SunnyWed11/411% chance of precipitationLow 34°High 55°
Wednesday: Mostly sunny, with a high near 55.
Wednesday Night: Partly cloudy, with a low around 34.
Mostly SunnyThu11/5Model blend14% chance of precipitationLow 33°High 56°
Thursday: Mostly cloudy. High near 56°. Low that night near 33°.
Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.
Fri11/6Model blend12% chance of precipitationLow 33°High 56°
Friday: Partly cloudy. High near 56°. Low that night near 33°.
Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.
Sat11/7Model blend19% chance of precipitationLow 33°High 55°
Saturday: Partly cloudy. High near 55°. Low that night near 33°.
Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.
Forecast for 45.940, -119.735 from the NWS PDT office, updated 10/29/2026, 3:01 PM PT · Official forecast on weather.gov
Days 8 to 10: NOAA National Blend of Models, station KHRI (Hermiston Muni, 24 mi), model run 10/29/2026, 1:00 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 (up to 24 hours) and GOES
Frequently asked questions
- What is the weather in Prosser, WA 99345 right now?
- The latest observation from Hermiston, Hermiston Municipal Airport was 55°F and mostly clear, reported at 10/29/2026, 2:40 PM PDT.
- What is the high temperature today in Prosser, WA 99345?
- The National Weather Service forecast for this afternoon calls for a high near 55°F. Partly Sunny.
- What is the 10-day forecast for Prosser, WA 99345?
- The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 5 to Nov 7) come from the NOAA National Blend of Models, with highs of 55°F to 56°F. Model guidance this far out often changes.
- What time is sunrise and sunset in Prosser, WA 99345 today?
- Sunrise is about 7:35 AM PDT and sunset is about 5:49 PM PDT (calculated for the center of the area, within a few minutes).
- What is the normal October weather in Prosser, WA 99345?
- At Boardman, the 1991 to 2020 normal high in October is 66°F and the normal low is 40°F.
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: None reported
UV and air quality forecast
EPA and AirNow
- AQI forecast today (Sunnyside)
- GoodPM2.5
- AQI forecast tomorrow (Sunnyside)
- GoodPM2.5
Drought
By countyBenton County, week of 10/27/2026
16% of the county is in moderate drought or worse.
Sun and moon
Local time, center of the area
- Sunrise
- 7:35 AM
- Sunset
- 5:49 PM
- Daylight
- 10 hr 14 min
- Moon
- Waning Gibbous 85% lit
- First light (civil dawn)
- 7:04 AM
- Last light (civil dusk)
- 6:20 PM
- Moonrise
- 8:05 PM
- Moonset
- 12:12 PM
Normal October weather
ClimateNormal October high 66°, low 40°, precipitation 0.74 in for the month. 1991 to 2020 normals at Boardman, 7 mi away.
Other places nearby
Data sources
- National Weather Service APINOAA · Official site
- National Blend of Models (NBM) text guidanceNOAA National Weather Service · Official site
- Convective Outlooks and Storm ReportsNOAA Storm Prediction Center · Official site
- Excessive Rainfall Outlook and Quantitative Precipitation ForecastsNOAA Weather Prediction Center · Official site
- National Water Prediction ServiceNOAA National Weather Service · Official site
- WFIGS Current Wildland Fire IncidentsNational Interagency Fire Center · Official site
- UV Index Forecast (Envirofacts)U.S. Environmental Protection Agency and NOAA · Official site
- AirNowU.S. Environmental Protection Agency · Official site
- NWS HeatRisk (experimental)NOAA National Weather Service · Official site
- U.S. Drought MonitorNational Drought Mitigation Center, USDA and NOAA · Official site
- BEACON 2.0 Beach Advisory and Closing On-line NotificationU.S. Environmental Protection Agency · Official site
- U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information · Official site
- Tides & Currents (CO-OPS API)NOAA Center for Operational Oceanographic Products and Services · Official site
- NEXRAD radar tilesIowa Environmental Mesonet, Iowa State University · Official site
- GOES-East and GOES-West GeoColor imageryNOAA NESDIS Center for Satellite Applications and Research · Official site
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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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