Dahlgren, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Dahlgren weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle23%—94°69°—
- SundayJul 5Light Showers25%0.33″88°71°-6°
- MondayJul 6Overcast22%—87°70°-1°
- TuesdayJul 7Overcast12%—84°68°-3°
- WednesdayJul 8Clear12%—87°66°+3°
- ThursdayJul 9Overcast32%—91°72°+4°
- FridayJul 10Drizzle36%0.04″87°70°-4°
AQI 53 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 47 now. With UV 6.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 42 around 1 PM.
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 47 now. With UV 6.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 42 around 1 PM.
- Present
- AQI 47
- UV peak
- 6.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 42
PM × Wind × Precip
PM2.5 at 6.9 µg/m³ (AQI 38) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.92
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:47 PM
- Moonset
- 10:03 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Dahlgren at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: April 5 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62828
16-Day Forecast — Dahlgren
- Sat94°69°23%
- Sun88°71°25%
- Mon87°70°22%
- Tue84°68°12%
- Wed87°66°12%
- Thu91°72°32%
- Fri87°70°36%
- Sat91°71°32%
- Sun78°62°15%
- Mon75°58°9%
- Tue78°61°10%
- Wed83°63°10%
- Thu82°65°16%
- Fri81°70°14%
- Sat84°70°26%
- Sun90°73°26%
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 — Dahlgren
SPC has placed Dahlgren 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 Dahlgren
- 62828