Petersburg, Michigan Weather
Fireflies rise from the lawn. Day 78 of spring. Read this microseason across nine climate regions →
Petersburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°51°—
- FridayJun 5Rain28%0.14″87°58°+2°
- SaturdayJun 6Overcast59%—79°69°-8°
- SundayJun 7Overcast——80°61°+1°
- MondayJun 8Overcast11%—76°61°-4°
- TuesdayJun 9Drizzle56%0.04″78°67°+2°
- WednesdayJun 10Light Drizzle33%0.01″80°67°+2°
AQI 106 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 16 in the last 6 hours — air quality is degrading. Ozone at AQI 51 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 51 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
- Present
- AQI 51
- UV peak
- 0.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.86 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.86
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:40 AM
- Moonset
- 2:36 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Petersburg at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: April 27 (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 5, 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 — Petersburg
SPC has placed Petersburg in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3SLGTSlight Risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.