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Saint Johns, MI Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Friday Night
Mostly clear, with a low around 37.
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Saturday
Sunny, with a high near 65.
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Saturday Night
Partly cloudy, with a low around 44.
National Weather Service forecast updated 3 days ago.
Hourly
Hourly forecast- Now60°
- 7 PM58°
- 8 PM52°
- 9 PM49°
- 10 PM47°
- 11 PM45°
- Sat12 AM44°
- 1 AM43°
- 2 AM42°
- 3 AM41°
- 4 AM40°
- 5 AM39°
- 6 AM38°
- 7 AM37°
- 8 AM38°
- 9 AM42°
- 10 AM47°
- 11 AM52°
- 12 PM56°
- 1 PM60°
- 2 PM62°
- 3 PM64°
- 4 PM65°
- 5 PM64°
10-day forecast
Details- TueOct 20Sunny40°65°
- WedOct 21Mostly Sunny41°66°
- ThuOct 22Sunny37°64°
- TodayOct 23Sunny37°63°
- SatOct 24Sunny44°65°
- SunOct 25Mostly Sunny46°68°
- MonOct 26Mostly Sunny then Slight Chance Rain Showers15%40°63°
- TueOct 27Sunny37°51°
- WedOct 28Cloudy37°54°
- ThuOct 29Mostly sunny43°55°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- FriModerate
- SatModerate
- SunModerate
Lansing, MI reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyLansing Area, records since 1863. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
Forecasters' discussion
From the National Weather Service office in GRR, issued 3 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 147 PM EDT Fri Oct 23 2026
VFR conditions and light winds are expected through this evening. However, another round of LIFR dense fog is expected at many terminals overnight through tomorrow morning, particularly at LAN, JXN, GRR, and MKG. 1/4 mile (or lower) visibilities can be expected at times, and fog may be slow to diminish once again tomorrow morning, but flight categories should improve to VFR by late morning.
AT AZO and BTL, fog did not materialize last night or this morning, and as such, but forecast confidence is low that these areas will remain fog-free again tonight. Some MVFR fog has been added to these terminals to represent the possibility of at least some fog filling in this gap overnight tonight.
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 kots 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 4Conservative index and reflects what the press published. Terms of use.