St. Johns, Michigan Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Johns weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain65%0.23″85°68°—
- SundayJul 5Overcast23%—80°68°-5°
- MondayJul 6Overcast——78°59°-2°
- TuesdayJul 7Partly Cloudy——82°57°+4°
- WednesdayJul 8Overcast——82°59°0°
- ThursdayJul 9Overcast26%—76°65°-6°
- FridayJul 10Overcast23%—81°61°+5°
AQI 35 (Good), driven by PM2.5. AQI down 27 over the last 6 hours — air quality is improving sharply. PM scrubbed by 3 hours of recent rain — PM2.5 down to 5.6 µg/m³, PM10 to 6.5 µg/m³.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM scrubbed by 3 hours of recent rain — PM2.5 down to 5.6 µg/m³, PM10 to 6.5 µg/m³.
- PM2.5/PM10
- 0.86
- Wind
- light
- Recent rain
- 3h in last 6h
- Pattern
- washed out
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:37 PM
- Moonset
- 10:39 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
St. Johns at a glance
- Today vs. normal: 70°F — typical for the season
- Last frost: May 4 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — St. Johns
- Sat84°68°65%
- Sun80°68°23%
- Mon78°59°6%
- Tue82°57°1%
- Wed82°59°8%
- Thu76°65°26%
- Fri81°61°23%
- Sat81°62°14%
- Sun76°61°13%
- Mon82°60°12%
- Tue72°61°10%
- Wed81°55°16%
- Thu81°58°33%
- Fri80°66°35%
- Sat75°58°16%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — St. Johns
SPC includes St. Johns in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in St. Johns
- 48879