Grinnell, WA Weather Forecast
Local 7-day forecast
Areas Of Fog then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grinnell, WA in one place.
Areas of fog before 8am. Sunny, with a high near 75. Northeast wind 1 to 5 mph.
Local Weather Overview
This forecast page for Grinnell, WA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 14, 2026 9:46 PM PDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Grinnell, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 14, 2026 9:46 PM PDT
- Forecast office
- OTX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grinnell
Sunday looks like the warmest upcoming period in Grinnell at 77 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 44 degrees F.
The strongest winds are forecast for Thursday at about 1 to 6 mph N.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 9:46 PM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- OTX
- Radar station
- KOTX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Areas of fog after 2am. Clear, with a low around 44. Northeast wind 1 to 5 mph.
Patchy fog before 7am, then a slight chance of rain showers. Sunny, with a high near 76. Chance of precipitation is 20%.
A chance of rain showers before 5am. Partly cloudy, with a low around 45. Chance of precipitation is 30%.
Mostly sunny, with a high near 74.
Mostly clear, with a low around 44.
Sunny, with a high near 75.
Mostly clear, with a low around 44.
Sunny, with a high near 77.
Mostly clear, with a low around 44.
Sunny, with a high near 76.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Areas Of Fog then Sunny
|
75°F |
1 to 5 mph
NE
|
|
Wednesday Night
Sep 16
|
Clear then Areas Of Fog
|
44°F |
1 to 5 mph
NE
|
|
Thursday
Sep 17
|
Patchy Fog then Slight Chance Rain Showers
|
76°F |
1 to 6 mph
N
|
|
Thursday Night
Sep 17
|
Chance Rain Showers
|
45°F |
0 to 6 mph
SW
|
|
Friday
Sep 18
|
Mostly Sunny
|
74°F |
1 to 5 mph
SW
|
|
Friday Night
Sep 18
|
Mostly Clear
|
44°F |
3 mph
S
|
|
Saturday
Sep 19
|
Sunny
|
75°F |
5 mph
S
|
|
Saturday Night
Sep 19
|
Mostly Clear
|
44°F |
2 mph
SE
|
|
Sunday
Sep 20
|
Sunny
|
77°F |
1 to 5 mph
S
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
44°F |
2 mph
SE
|
|
Monday
Sep 21
|
Sunny
|
76°F |
2 to 6 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grinnell.