Lake Forest, Illinois Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Lake Forest weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——88°56°—
- FridayJun 5Heavy Rain65%0.62″81°70°-7°
- SaturdayJun 6Showers52%0.17″83°65°+2°
- SundayJun 7Light Drizzle——76°63°-7°
- MondayJun 8Light Showers29%—79°64°+3°
- TuesdayJun 9Foggy23%—80°65°+1°
- WednesdayJun 10Drizzle21%—80°70°0°
PM2.5 at 7.3 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature. AQI down 14 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 7.3 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.96
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:28 AM
- Moonset
- 1:46 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Lake Forest at a glance
- Today vs. normal: 16°F below 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 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 Forest
SPC has placed Lake Forest in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- 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.