Marysville, MI 48040 Weather

St. Clair County3:58 PM EDT42.91°N, 82.48°W

Current conditions

Clear
64°
Clear
Feels like 64°
High 64°·Low 42°
WindSSW 2 mph
Humidity34%
Dew point36°
Pressure30.26 inHg
Visibility10.0 mi
Cloud cover11%
UV index3 Moderate
Sunrise7:51 AM
Sunset6:39 PM

Observed at St Clair County International Airport · 1 hr ago

Forecast

10-day

  • This Afternoon

    Sunny, with a high near 64. South southwest wind around 2 mph.

  • Tonight

    Patchy fog after 2am. Mostly clear, with a low around 42. West southwest wind around 2 mph.

  • Thursday

    Patchy fog before 9am. Mostly sunny. High near 65, with temperatures falling to around 62 in the afternoon. North northwest wind 2 to 9 mph.

National Weather Service forecast updated 1 hr ago.

Hourly

Hourly forecast
  1. Now Sunny 63°
  2. 4 PM Sunny 64°
  3. 5 PM Sunny 64°
  4. 6 PM Clear 61°
  5. 7 PM Mostly Clear 58°
  6. 8 PM Mostly Clear 53°
  7. 9 PM Mostly Clear 51°
  8. 10 PM Mostly Clear 49°
  9. 11 PM Partly Cloudy 48°
  10. Thu12 AM Partly Cloudy 47°
  11. 1 AM Partly Cloudy 46°
  12. 2 AM Patchy Fog 45°
  13. 3 AM Patchy Fog 44°
  14. 4 AM Patchy Fog 43°
  15. 5 AM Patchy Fog 42°
  16. 6 AM Patchy Fog 42°
  17. 7 AM Patchy Fog 42°
  18. 8 AM Patchy Fog 42°
  19. 9 AM Sunny 46°
  20. 10 AM Mostly Sunny 54°
  21. 11 AM Mostly Sunny 58°
  22. 12 PM Mostly Sunny 61°
  23. 1 PM Mostly Sunny 63°
  24. 2 PM Mostly Sunny 64°

10-day forecast

Details
  1. TodayOct 21 Sunny Sunny42°64°
  2. ThuOct 22 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny42°65°
  3. FriOct 23 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny39°63°
  4. SatOct 24 Patchy Fog then Sunny Patchy Fog then Sunny45°64°
  5. SunOct 25 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny48°66°
  6. MonOct 26 Patchy Fog then Partly Sunny Patchy Fog then Partly Sunny45°64°
  7. TueOct 27 Slight Chance Light Rain Slight Chance Light Rain15%41°58°
  8. WedOct 28 Cloudy Cloudy47°67°
  9. ThuOct 29 Rain Rain0.15 in47°70°
  10. FriOct 30 Sunny Sunny38°55°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in Michigan

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Sun & moon

Sunrise 7:51 AM
Sunset 6:39 PM
Daylight 10 h 48 min (−2 min 46 s tomorrow)
Waxing Gibbous · 79% lit
Moonrise 4:25 PM Moonset 2:45 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low58° / 44°
Record high81° (1979)
Record low24° (1952)
Wettest1.57 in (1965)
Month to date1.85 in (normal 2.04 in)

Port Huron, records since 1931. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in DTX, issued 2 hrs ago

Key Messages

- Mild and dry through the week.

Dtw Threshold Probabilities

* None.

Prev Discussion

Issued at 312 AM EDT Wed Oct 21 2026

DISCUSSION...

The combination of clear skies under light east to southeasterly flow has resulted in the proliferation of dense fog through southern and central Michigan, and to a lesser extent across the Thumb. The favorable flow has brought about better moisture advection derived from Lake Erie inland, where continued advection along with gentle upsloping will see dense fog expand west and northwest through central MI. This will continue to promote fog across Monroe and Lenawee counties, where a dense fog advisory is in effect until 10 AM EDT. Portions of western Washtenaw, the Tri-Cities and Thumb will likely see periodic fog, possibly dense at times, through daybreak, with sunshine then works the lift and scour out fog through the remaining morning hours.

The familiar persistence forecast will again take hold today as high pressure sits over the Great Lakes, which will be reinforced through Friday as a longwave ridge expands through the Plains and Midwest/Great Lakes. Dry weather and above normal temperatures continue as a result through the weekend. Daytime highs will return into the upper 60s today and tomorrow and may make a push into the 70s by tomorrow afternoon. A very subtle decrease in highs (low to mid 60s) will be likely Friday with northeast flow coming off the lake, but as the aforementioned high pressure system starts to depart into the western Atlantic, low-level flow re-orients south to southwesterly, resulting in the gentle uptick in waa pushing highs back in the mid to upper 60s. Fog, dense at times, remains highly sensitive to wind direction as shallow lake moisture advection has been the main driver of recent events. Tomorrow morning fog is a possibility under clear skies, but the unfavorable flow lowers confidence relative to today. Friday morning will be much more conducive to advective fog given the light east to northeast flow off of Lake Huron and Saginaw Bay. Patchy to areas of dense fog will be possible through the Tri-Cities and Thumb with lowered confidence for the degree of expansion inland. Outside of morning fog concerns, dry and sunny weather continues through the weekend.

MARINE...

High pressure remains over the region through the end of the week resulting in benign marine conditions. The current high now centered over Quebec, will slowly shifts east through tonight with a dry cold front then passing southward early Thursday. This front will quickly be followed by another area of high pressure that will then hold through most of the weekend. Wind gusts will stay below 20 knots through the end of the week. Winds will be southerly today before flipping around to the north for Thursday behind the cold front early in the morning.

Dtx Watches

MI...None. Lake Huron...None. Lake St Clair...None. Michigan waters of Lake Erie...None.

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 4Conservative index and reflects what the press published. Terms of use.