St. Joseph, Michigan Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
St. Joseph weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°58°—
- FridayJun 5Showers73%1.4″75°64°-10°
- SaturdayJun 6Showers70%—71°63°-4°
- SundayJun 7Overcast——76°63°+5°
- MondayJun 8Overcast15%—77°64°+1°
- TuesdayJun 9Light Drizzle24%—77°64°0°
- WednesdayJun 10Light Drizzle20%—75°67°-2°
PM2.5 at 6.8 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature. AQI down 21 over the last 6 hours — air quality is improving sharply.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~65%) — afternoon ozone should stay flat.
- Present
- AQI 31
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 6.8 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:22 AM
- Moonset
- 1:40 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
St. Joseph at a glance
- Today vs. normal: 13°F below the seasonal normal for this latitude
- Last frost: April 29 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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. Joseph
SPC has placed St. Joseph in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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.