Sullivan, MI Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Sullivan, MI in one place.
A slight chance of rain showers between 7am and 8am, then a chance of showers and thunderstorms between 8am and 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly sunny. High near 87, with temperatures falling to around 85 in the afternoon. West northwest wind 10 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
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: Jul 17, 2026 11:05 AM EDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Sullivan, MI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 11:05 AM EDT
- Forecast office
- GRR
- Source
- NOAA / NWS
Daily Outlook
This Week in Sullivan
Saturday looks like the warmest upcoming period in Sullivan at 87 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 57 degrees F.
The strongest winds are forecast for Tuesday at about 12 to 18 mph WNW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 11:05 AM EDT
- Coverage
- 6 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, with a low around 61. North wind 5 to 16 mph, with gusts as high as 29 mph.
Sunny, with a high near 85. North wind 3 to 10 mph, with gusts as high as 21 mph.
Partly cloudy, with a low around 65.
A chance of rain showers after 2pm. Partly sunny, with a high near 85.
A chance of rain showers before 8pm, then showers and thunderstorms. Mostly cloudy, with a low around 69.
A chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 82.
Partly cloudy, with a low around 59.
Sunny, with a high near 78.
Mostly clear, with a low around 57.
Sunny, with a high near 80.
Mostly clear, with a low around 60.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
87°F |
10 to 16 mph
WNW
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
61°F |
5 to 16 mph
N
|
|
Sunday
Jul 19
|
Sunny
|
85°F |
3 to 10 mph
N
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
65°F |
1 to 10 mph
WSW
|
|
Monday
Jul 20
|
Partly Sunny then Chance Rain Showers
|
85°F |
6 to 17 mph
SSW
|
|
Monday Night
Jul 20
|
Showers And Thunderstorms
|
69°F |
12 to 17 mph
SW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Mostly Sunny
|
82°F |
12 to 18 mph
WNW
|
|
Tuesday Night
Jul 21
|
Partly Cloudy
|
59°F |
8 to 18 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
78°F |
9 to 14 mph
NNW
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
57°F |
2 to 13 mph
NW
|
|
Thursday
Jul 23
|
Sunny
|
80°F |
2 to 9 mph
WNW
|
|
Thursday Night
Jul 23
|
Mostly Clear
|
60°F |
2 to 8 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sullivan.