South Barrington, Illinois Weather
Fireflies rise from the lawn. Day 78 of spring. Read this microseason across nine climate regions →
South Barrington weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——86°57°—
- FridayJun 5Light Showers59%0.52″75°66°-11°
- SaturdayJun 6Heavy Drizzle35%—85°68°+10°
- SundayJun 7Drizzle15%—80°64°-5°
- MondayJun 8Heavy Drizzle57%0.01″73°68°-7°
- TuesdayJun 9Light Drizzle50%0.01″84°68°+11°
- WednesdayJun 10Thunderstorm28%—86°69°+2°
Ozone at AQI 78. AQI up 50 in the last 6 hours — air quality is degrading. Overcast through the UV peak window (cloud cover ~100%) — 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 78. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 78
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 6.7 µg/m³, PM10 at 8.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.83
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:58 AM
- Moonset
- 2:55 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
South Barrington at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 29 (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 — South Barrington
SPC has placed South Barrington in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
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.