Grandjean, ID Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grandjean, ID in one place.
Sunny, with a high near 63. South southwest wind 1 to 7 mph.
Local Weather Overview
This forecast page for Grandjean, ID 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 8:55 PM MDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Grandjean, ID.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 14, 2026 8:55 PM MDT
- Forecast office
- BOI
- Source
- NOAA / NWS
Daily Outlook
This Week in Grandjean
Wednesday looks like the warmest upcoming period in Grandjean at 68 degrees F.
Friday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Wednesday Night at about 5 to 10 mph SE.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 8:55 PM MDT
- Coverage
- 7 days
- Time zone
- America/Boise
- Forecast office
- BOI
- Radar station
- KCBX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 42. Southeast wind 2 to 6 mph.
Sunny, with a high near 68. East southeast wind 1 to 5 mph.
A slight chance of rain showers after midnight. Partly cloudy, with a low around 46. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.
A chance of rain showers before noon, then showers and thunderstorms likely. Partly sunny, with a high near 66. Chance of precipitation is 60%.
A chance of rain showers. Mostly cloudy, with a low around 44. Chance of precipitation is 50%.
A chance of rain showers. Partly sunny, with a high near 59. Chance of precipitation is 50%.
A chance of rain showers before midnight. Partly cloudy, with a low around 40. Chance of precipitation is 30%.
Sunny, with a high near 63.
Mostly clear, with a low around 42.
Sunny, with a high near 66.
Mostly clear, with a low around 43.
Sunny, with a high near 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Sep 15
|
Sunny
|
63°F |
1 to 7 mph
SSW
|
|
Tuesday Night
Sep 15
|
Partly Cloudy
|
42°F |
2 to 6 mph
SE
|
|
Wednesday
Sep 16
|
Sunny
|
68°F |
1 to 5 mph
ESE
|
|
Wednesday Night
Sep 16
|
Partly Cloudy then Slight Chance Rain Showers
|
46°F |
5 to 10 mph
SE
|
|
Thursday
Sep 17
|
Showers And Thunderstorms Likely
|
66°F |
2 to 7 mph
SSE
|
|
Thursday Night
Sep 17
|
Chance Rain Showers
|
44°F |
1 to 5 mph
ESE
|
|
Friday
Sep 18
|
Chance Rain Showers
|
59°F |
0 to 5 mph
SSW
|
|
Friday Night
Sep 18
|
Chance Rain Showers then Partly Cloudy
|
40°F |
1 to 5 mph
NNE
|
|
Saturday
Sep 19
|
Sunny
|
63°F |
0 to 5 mph
N
|
|
Saturday Night
Sep 19
|
Mostly Clear
|
42°F |
1 to 5 mph
N
|
|
Sunday
Sep 20
|
Sunny
|
66°F |
0 to 3 mph
S
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
43°F |
1 to 5 mph
SSE
|
|
Monday
Sep 21
|
Sunny
|
66°F |
1 to 5 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grandjean.