Waterloo, Illinois Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Waterloo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——78°53°—
- ThursdayJun 4Overcast——82°60°+4°
- FridayJun 5Drizzle16%—85°62°+3°
- SaturdayJun 6Showers16%—88°66°+3°
- SundayJun 7Light Showers35%—87°69°-1°
- MondayJun 8Drizzle58%0.03″81°69°-6°
- TuesdayJun 9Drizzle36%—82°69°+1°
Ozone at AQI 86 — peak already passed at 1 PM under clear skies. AQI up 16 in the last 6 hours — air quality is degrading. Levels should ease through evening.
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 86 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 86
- UV peak
- 6.4 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 86
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
- 3:46 AM
- Moonset
- 1:05 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Waterloo at a glance
- Today vs. normal: 78°F — typical for the season
- Last frost: April 6 (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 — Waterloo
SPC has placed Waterloo in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
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.