Lake Petersburg, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Lake Petersburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle47%0.01″91°69°—
- SundayJul 5Overcast14%—83°69°-8°
- MondayJul 6Light Drizzle——83°67°0°
- TuesdayJul 7Clear——81°62°-2°
- WednesdayJul 8Overcast——84°63°+3°
- ThursdayJul 9Light Drizzle40%—84°71°0°
- FridayJul 10Drizzle40%0.01″80°69°-4°
AQI 25 (Good), driven by PM2.5. AQI down 9 over the last 6 hours (gradual decline). PM2.5 at 8.2 µg/m³, PM10 at 9.3 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36. Overcast through the UV peak window (cloud cover ~80%) — afternoon ozone should stay flat.
- Present
- AQI 36
- UV peak
- 5.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 8.2 µg/m³, PM10 at 9.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.88
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:54 PM
- Moonset
- 10:05 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Lake Petersburg at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Lake Petersburg
- Sat91°69°47%
- Sun83°69°14%
- Mon83°67°8%
- Tue81°62°4%
- Wed84°63°7%
- Thu84°71°40%
- Fri80°69°40%
- Sat83°68°17%
- Sun73°59°7%
- Mon75°57°5%
- Tue75°60°10%
- Wed80°64°16%
- Thu82°65°19%
- Fri82°68°26%
- Sat85°69°26%
- Sun85°72°29%
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 — Lake Petersburg
SPC has placed Lake Petersburg in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
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.
ZIP codes in Lake Petersburg
- 62675