Waterloo, IL Weather Forecast
Monroe County, Illinois
Live radar, warnings and storm tracking for Waterloo, with free alerts the moment it counts.
The next few hours
Taller, warmer bars mean heavier rain. Dotted means no reading for that hour.
Hour by hour
Sunrise and sunset
Next five days, scored 0 to 100The first day or two use the HRRR and NBM cloud layers. Later days only have total cloud, so treat them as a rough guide.
Know when sunset at this place will be worth a photo
We score every sunrise and sunset here from the cloud, haze and smoke forecast, and let you know when one is likely to light up. Sunrise the evening before, sunset a few hours ahead.
Seven-day outlook
Free alerts for Waterloo
Every NWS warning, pushed to your phone, inbox or webhook the moment it is issued.
Waterloo, IL at a glance
Waterloo is home to about 11,144 people in Monroe County, across 8.2 square miles. It ranks 204th by population of 441 places in Illinois with a forecast here. The nearest neighbour with its own forecast is Columbia, 9 miles away.
- County
- Monroe County
- Population
- 11,144 2023 est.
- Land area
- 8.2 sq mi
- People per sq mi
- 1,353
- Forecast point
- 38.3412°N, 90.1527°W
How well can the network see Waterloo?
The nearest Doppler radar is KLSX (St. Louis, MO), to the NW. Its lowest scan passes about 2,500 ft above Waterloo. Close enough to see rotation in the low part of a storm, where tornadoes form. Waterloo is closer to its radar than 59% of US cities.
The closest weather station is KCPS (St Louis/Downtown Arpt). Far enough that current conditions for Waterloo are a reading from somewhere else.
Forecasts near Waterloo
- Columbia, IL9 mi
- Millstadt, IL9 mi
- Smithton, IL10 mi
- Red Bud, IL12 mi
- Dupo, IL13 mi
- Arnold, MO13 mi
- Pevely, MO14 mi
- Herculaneum, MO14 mi
Elsewhere in Illinois
ChicagoAuroraJolietNapervilleRockfordElginAll Illinois forecasts →