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Saint Louis, MI Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Saturday
Mostly sunny, with a high near 68. South southeast wind 2 to 7 mph.
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Saturday Night
Partly cloudy, with a low around 45.
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Sunday
Partly sunny, with a high near 71.
National Weather Service forecast updated 2 days ago.
Hourly
Hourly forecast- Now68°
- 5 PM67°
- 6 PM64°
- 7 PM61°
- 8 PM58°
- 9 PM56°
- 10 PM54°
- 11 PM52°
- Sun12 AM51°
- 1 AM51°
- 2 AM50°
- 3 AM49°
- 4 AM48°
- 5 AM47°
- 6 AM46°
- 7 AM45°
- 8 AM46°
- 9 AM50°
- 10 AM54°
- 11 AM59°
- 12 PM63°
- 1 PM67°
- 2 PM69°
- 3 PM71°
10-day forecast
Details- ThuOct 22Sunny42°69°
- FriOct 23Patchy Fog then Mostly Sunny41°65°
- TodayOct 24Mostly Sunny45°68°
- SunOct 25Partly Sunny47°71°
- MonOct 26Partly Sunny11%41°63°
- TueOct 27Mostly Cloudy18%38°59°
- WedOct 28Slight Chance Rain Showers then Partly Sunny18%40°59°
- ThuOct 29Rain0.12 in38°56°
- FriOct 30Cloudy35°46°
- SatOct 31Sunny33°53°
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 in Michigan
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- SatModerate
- SunModerate
- MonGood
Mt Pleasant, MI reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Nearby
- Saginaw 53 km
- Midland 37 km
- Mount Pleasant 25 km
- Saginaw Township North 49 km
- Owosso 57 km
- Alma 5 km
- Greenville 58 km
- Saint Johns 45 km
- Freeland 41 km
- Bridgeport 59 km
- Buena Vista 57 km
- Shields 44 km
Forecasters' discussion
From the National Weather Service office in GRR, issued 20 hrs ago
Key Messages
- Dense Fog Saturday Morning; Patchy Fog on Sunday
- Pattern Change ahead with chances for rain beyond midweek
Discussion
Issued at 157 PM EDT Fri Oct 23 2026
- Dense Fog Saturday Morning; Patchy Fog on Sunday
High pressure will continue dominate the weather pattern with light winds and warmer air through the weekend. The light winds, high pressure, clearing skies is a great recipe for morning fog. There is some question if it forms later. However, the flow from the east should allow for moisture to converge overnight and fog to form across the region. Models remain consistent with highs 10 to 15 degrees above normal with Max temps in the upper 60s to low 70s across the lower Peninsula.
The flow will shift Saturday night into Sunday and this will lessen the chance for fog development. However, given radiational cooling, clearing skies and light winds overall, patchy fog will be again possible Sunday morning, though it should be less dense than Friday and Saturday.
- Pattern Change ahead with chances for rain beyond midweek
The upper level pattern has the high shifting southward and flattening next week. However, sfc high pressure should remain stout enough to keep any moisture bands to only effect the northern half of the lower Peninsula Monday and Tuesday. The ensembles diverge on timing but the cold front associated with a low pressure system tracking from the Canadian Rockies to Hudson Bay will likely bring cooler air into Michigan dropping highs closer to normal, in the upper 50s to mid 60s.
Aviation
Issued at 723 PM EDT Fri Oct 23 2026
VFR conditions are expected at the beginning of the period, but another round of fog is expected overnight through tomorrow morning across much of lower Michigan. Highest probabilities of LIFR ceilings and visibilities are at LAN and JXN, followed closely by GRR and MKG. Confidence is low that fog will develop at BTL and AZO, as fog did not develop there the previous night, and model probabilities are much lower west of US-131. Fog should linger through mid morning, with VFR conditions thereafter.
BRC
Marine
Issued at 157 PM EDT Fri Oct 23 2026
Fair winds and waves will dominate the pattern today. Another round of fog will be possible Saturday and Sunday morning and may affect the harbors and portions of the nearshore, mainly north of Grand Haven. Southerly winds will increase tomorrow, upwards of 10 to 20 kts and will build waves to 2 to 4 feet north of Whitehall, persisting into Sunday morning.
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 4Search index and reflects what the press published. Terms of use.