Osco, Illinois Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Osco weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——83°54°—
- ThursdayJun 4Overcast10%—86°57°+3°
- FridayJun 5Light Showers61%0.10″81°67°-5°
- SaturdayJun 6Heavy Showers57%0.37″84°63°+3°
- SundayJun 7Overcast21%—83°66°-1°
- MondayJun 8Light Showers45%0.02″73°67°-10°
- TuesdayJun 9Light Drizzle25%—82°70°+9°
Ozone at AQI 58. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~60%) — afternoon ozone should stay flat.
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 58. Overcast through the UV peak window (cloud cover ~60%) — afternoon ozone should stay flat.
- Present
- AQI 58
- UV peak
- 8.6 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 33
PM × Wind × Precip
PM2.5 at 8.0 µg/m³ (AQI 44) with a 0.83 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.83
- Wind
- calm
- 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
- 3:57 AM
- Moonset
- 12:55 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Osco at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 24 (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 3, 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 — Osco
SPC has placed Osco in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal Risk
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.