Round Lake, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Round Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Drizzle69%0.10″82°67°—
- SundayJul 5Overcast18%—79°63°-3°
- MondayJul 6Overcast——76°60°-3°
- TuesdayJul 7Overcast——80°58°+4°
- WednesdayJul 8Overcast15%—81°60°+1°
- ThursdayJul 9Light Drizzle49%0.04″77°64°-4°
- FridayJul 10Overcast43%—77°61°0°
AQI 39 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.91 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
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 39 now. With UV 4.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 15 around 1 PM.
- Present
- AQI 39
- UV peak
- 4.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 15
PM × Wind × Precip
PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.91 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- 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
- 10:50 PM
- Moonset
- 9:56 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Round Lake at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 60073
16-Day Forecast — Round Lake
- Sat82°67°69%
- Sun79°63°18%
- Mon76°60°1%
- Tue80°58°1%
- Wed81°60°15%
- Thu77°64°49%
- Fri77°61°43%
- Sat82°60°10%
- Sun66°59°8%
- Mon74°55°8%
- Tue76°60°8%
- Wed80°64°26%
- Thu83°66°16%
- Fri84°68°16%
- Sat86°69°20%
- Sun86°69°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 — Round Lake
SPC includes Round Lake in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Round Lake
- 60073