Sullivan, MI Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Sullivan, MI in one place.
Sunny, with a high near 56. Southwest wind 2 to 12 mph, with gusts as high as 23 mph.
Local Weather Overview
This forecast page for Sullivan, MI 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: Oct 17, 2026 12:57 PM EDT.
The active forecast window currently covers Oct 17 to Oct 23, 2026 for Sullivan, MI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 17 to Oct 23, 2026
- Latest sync
- Oct 17, 2026 12:57 PM EDT
- Forecast office
- GRR
- Source
- NOAA / NWS
Daily Outlook
This Week in Sullivan
Friday looks like the warmest upcoming period in Sullivan at 71 degrees F.
Monday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Sunday at about 12 to 17 mph SW.
The forecast from Oct 17 through Oct 23 stays mostly dry.
Forecast Details
- Last updated
- Oct 17, 2026 12:57 PM EDT
- Coverage
- 7 days
- Time zone
- America/Detroit
- Forecast office
- GRR
- Radar station
- KGRR
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear. Low around 45, with temperatures rising to around 48 overnight. Southwest wind 8 to 12 mph, with gusts as high as 22 mph.
Sunny. High near 60, with temperatures falling to around 58 in the afternoon. Southwest wind 12 to 17 mph, with gusts as high as 31 mph.
Clear, with a low around 45. South southwest wind 5 to 15 mph, with gusts as high as 28 mph.
Sunny, with a high near 64. Southwest wind around 7 mph.
Mostly clear, with a low around 40.
Sunny, with a high near 68.
Mostly clear, with a low around 43.
Sunny, with a high near 69.
Mostly clear, with a low around 47.
Mostly sunny, with a high near 70.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 71.
Partly cloudy, with a low around 47.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 17
|
Sunny
|
56°F |
2 to 12 mph
SW
|
|
Tonight
Oct 17
|
Mostly Clear
|
45°F |
8 to 12 mph
SW
|
|
Sunday
Oct 18
|
Sunny
|
60°F |
12 to 17 mph
SW
|
|
Sunday Night
Oct 18
|
Clear
|
45°F |
5 to 15 mph
SSW
|
|
Monday
Oct 19
|
Sunny
|
64°F |
7 mph
SW
|
|
Monday Night
Oct 19
|
Mostly Clear
|
40°F |
0 to 3 mph
ESE
|
|
Tuesday
Oct 20
|
Sunny
|
68°F |
3 mph
SE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
43°F |
0 to 3 mph
E
|
|
Wednesday
Oct 21
|
Sunny
|
69°F |
5 mph
SSE
|
|
Wednesday Night
Oct 21
|
Mostly Clear
|
47°F |
2 mph
SSE
|
|
Thursday
Oct 22
|
Mostly Sunny
|
70°F |
3 mph
SSW
|
|
Thursday Night
Oct 22
|
Partly Cloudy
|
47°F |
2 mph
S
|
|
Friday
Oct 23
|
Mostly Sunny
|
71°F |
5 mph
ESE
|
|
Friday Night
Oct 23
|
Partly Cloudy
|
47°F |
2 to 6 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sullivan.