Waterloo, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Waterloo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain33%0.83″94°73°—
- SundayJul 5Light Drizzle19%0.02″83°70°-11°
- MondayJul 6Light Showers23%—87°69°+4°
- TuesdayJul 7Overcast23%—85°67°-2°
- WednesdayJul 8Overcast13%—92°66°+7°
- ThursdayJul 9Light Drizzle30%—97°72°+5°
- FridayJul 10Heavy Drizzle31%—90°72°-7°
AQI 37 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 32. Overcast through the UV peak window (cloud cover ~77%) — 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 32. Overcast through the UV peak window (cloud cover ~77%) — afternoon ozone should stay flat.
- Present
- AQI 32
- UV peak
- 0.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.92
- 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
- 10:53 PM
- Moonset
- 10:08 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Waterloo at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 6 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62298
16-Day Forecast — Waterloo
- Sat94°73°33%
- Sun83°70°19%
- Mon87°69°23%
- Tue85°67°23%
- Wed92°66°13%
- Thu97°72°30%
- Fri90°72°31%
- Sat90°72°17%
- Sun80°64°11%
- Mon79°59°2%
- Tue80°61°7%
- Wed83°63°12%
- Thu82°65°14%
- Fri82°68°10%
- Sat87°69°13%
- Sun91°71°16%
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 — Waterloo
SPC has placed Waterloo in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- 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.
ZIP codes in Waterloo
- 62298