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Prosser, WA 99350 Weather
Current conditions
Observed at Sunnyside Municipal Airport · 59 min ago
Forecast
10-day-
Today
Sunny. High near 70, with temperatures falling to around 68 in the afternoon. Northeast wind around 2 mph.
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Tonight
Mostly clear. Low around 39, with temperatures rising to around 41 overnight. Northeast wind around 1 mph.
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Thursday
Mostly cloudy. High near 67, with temperatures falling to around 64 in the afternoon. Southwest wind around 2 mph.
National Weather Service forecast updated 4 hrs ago.
Hourly
Hourly forecast- Now41°
- 9 AM46°
- 10 AM54°
- 11 AM58°
- 12 PM61°
- 1 PM65°
- 2 PM67°
- 3 PM69°
- 4 PM69°
- 5 PM68°
- 6 PM65°
- 7 PM60°
- 8 PM52°
- 9 PM51°
- 10 PM49°
- 11 PM48°
- Thu12 AM46°
- 1 AM45°
- 2 AM44°
- 3 AM43°
- 4 AM41°
- 5 AM41°
- 6 AM40°
- 7 AM39°
Daily forecast
Details- TodayOct 21Sunny39°70°
- ThuOct 22Mostly Cloudy12%37°67°
- FriOct 23Patchy Frost then Sunny32°65°
- SatOct 24Mostly Sunny24%34°60°
- SunOct 25Slight Chance Rain Showers then Mostly Sunny22%33°60°
- MonOct 26Mostly Sunny15%32°59°
- TueOct 27Mostly Sunny32°60°
- WedOct 28Mostly sunny40°62°
- ThuOct 29Partly cloudy38°60°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Prosser
More weather news- Fall colors coming soon to Tri-Cities region, ETSU experts say
Johnson City Press Fall colors are reaching their peak in areas across the Southern Appalachians Vibrant oranges and yellows will cascade through lower elevations this weekend and into next week, according to East…
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Returning to more seasonal temperatures Sunday; warmer days ahead next weekLINCOLN, Neb. (KOLN) - A cold start to Saturday morning gave way to a brisk fall afternoon, but warmer weather is on the way for the coming week. High pressure continues to dominate the region, keeping skies clear and…
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First frost of the season arrives this weekendby WCYB (Kit Alexander) Get ready for a rollercoaster ride of temperatures from the record heat this week to frost and near-freezing conditions early Sunday morning. Freeze watches are in effect for some in Southwest…
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Fall color report: Highest peaks fade as color moves downFall color is on the move across the Southern Appalachians. The highest peaks have largely passed peak, but elevations just below them are entering some of their best color of the season, according to East Tennessee…
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Pleasant weekend taking shape as temperatures feel like autumnWNEM SAGINAW, Mich. (WNEM) - A freeze warning is in effect Friday night through 8 a.m. Saturday for the Tri-Cities, along Interstate 69 and along U.S. 127. A frost advisory is in effect until 8 a.m. Saturday for the…
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Mild sunshine and temps in the 70s will carry the Columbia Basin into the weekendNonstop Local News The current ridge is expected to shift eastward over the Rockies in the coming days as a shortwave from the northwest moves into the PNW This will lead to gusty winds up to 40 MPH in the Kittitas…
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Forecast stays mostly dry as highs go back into 70s through SaturdayLook below to read more! 1. Highs ~mostly~ in 60s/70s Although the week started on the cooler side, highs in the Tri-Cities should be back in the 70s on Wednesday. In fact, they could touch 75 again for Thursday through…
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Week Ahead in Washington: Week of October 18KY3 Week Ahead in Washington: Week of October 18 Woman kills husband, 3-year-old son at Great Wolf Lodge, police say Firefighters warn carbon monoxide alarms save lives as cold weather increases heating use Missouri Fan…
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Washington-Kyiv Rift Deepens as Zelensky Feels “Betrayed”Jordan News Washington-Kyiv Rift Deepens as Zelensky Feels “Betrayed”
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Washington DC weather forecast: Rain today, sunny skies and warming trends aheadThe Times of India Washington DC, October 17, 2026 This morning, residents can expect a little rain, leading into a windy and cooler day The high temperature is forecasted to reach 14°C, with a noticeable drop tonight…
Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- WedModerate
Sunnyside, WA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlySunnyside No. 2, records since 2013. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
Forecasters' discussion
From the National Weather Service office in PDT, issued 4 hrs ago
Key Messages
- Above normal temperatures and dry conditions Today
- Return of showers and isolated thunderstorms to the eastern mountains Thursday, with breezy conditions in the lower elevations Thursday and Friday
- Moderate to High confidence (60-90%) in freezing morning temperatures Saturday
Discussion
An upper low continues spinning off of the central CA coast, with ridging across the Interior Northwest. As a result, clouds remain high across the central and eastern Oregon counties, with more sun across the Washington zones. Today will be the warmest afternoon across the broader area, and for all elevations, reaching the mid/upper 60s again over the Columbia Basin and Kittitas/Yakima Valleys, to the low/mid 70s across central Oregon/Grande Ronde Valley/John Day Basin. Another day of light and diurnally and terrain driven winds for all zones.
The next weather system will impact the winds due to pressure gradients across the Cascade gaps/Columbia River Gorge. NBM ensemble members show a range of about 50 to 75 percent offering wind advisory level , 39 mph or higher gusts Thursday evening. More mid and high cloudiness will be spreading farther north into WA Tonight and though the morning on Thursday. REFs shows light precipitation associated with a weak orographic / deformation band spreading north (southwest to northeast orientation) off the Blue Mountains, and bringing measurable (less than wetting rains) precipitation across the foothills of the Blues and into the lower Columbia Basin/central Oregon though noon. Better forcing/moisture profiles develop later Thursday and Thursday night and cool air aloft acts to increase instability and bump 3-hr QPF means to the 0.10 and locally 0.25 amounts starting mid evening Thursday in the southern Blues, and ending across the Wallowas sometime mid Friday morning.
Following the exit of the amplified trough, colder air will give another opportunity for freezing temperatures over higher populated areas of the Lower Columbia, and Yakima/Kittitas Valley zones that have not had the season ending freeze just yet. This opportunity comes Saturday morning. Blue Mt Foothills and Kittitas valley, including Walla Walla, Pendleton/Ellensburg have around a 90% chance or higher based on NBM probabilities of sub freezing temps. A bit less certainty exists as Yakima to Sunnyside falls in at about a 50 to 60 percent chance for 32 degrees or colder Saturday morning.
Aviation
Light winds under 5 knots and VFR clear conditions are anticipated at all terminals over the next 24 hours.
Pdt Watches
WA...None. OR...None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.