Waterloo, IL weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Waterloo now
Loading the National Weather Service forecast…
Waterloo weather by the hour
Waterloo weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Waterloo.
This week in Waterloo
Sunrise, sunset and moon in Waterloo
What is the weather usually like in Waterloo?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 88°F average high
- Januarycoldest month · 22°F average low
- 43.6 inprecipitation per year · 1,107 mm
- 9.2 insnowfall per year · 23 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Waterloo: May and August to October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station FESTUS, MO US (USC00232850), adjusted for the elevation of Waterloo.
Waterloo weather month by month
Sunrise and sunset in Waterloo through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:14 AM | 5:05 PM | 9 h 51 min |
| February | 6:49 AM | 5:40 PM | 10 h 50 min |
| March | 7:09 AM | 7:08 PM | 11 h 59 min |
| April | 6:22 AM | 7:38 PM | 13 h 15 min |
| May | 5:47 AM | 8:06 PM | 14 h 18 min |
| June | 5:34 AM | 8:27 PM | 14 h 52 min |
| July | 5:47 AM | 8:25 PM | 14 h 37 min |
| August | 6:14 AM | 7:55 PM | 13 h 41 min |
| September | 6:41 AM | 7:10 PM | 12 h 29 min |
| October | 7:08 AM | 6:24 PM | 11 h 15 min |
| November | 6:40 AM | 4:49 PM | 10 h 8 min |
| December | 7:08 AM | 4:42 PM | 9 h 33 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Waterloo?
Waterloo has a hot-summer humid continental climate. The warmest month is July, with an average high of 88°F (31°C), and the coldest is January, with average lows of 22°F (-6°C).
It gets about 43.6 inches (1,107 mm) of precipitation a year. The wettest month is April and the driest is February. Snow is common: about 9 inches fall in an average year.
The best time to visit Waterloo is May and August to October. At 719 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Waterloo
Weather in towns near Waterloo
Questions about the weather in Waterloo
What is the hottest month in Waterloo?
July, with an average high of 88°F (31°C).
What is the coldest month in Waterloo?
January, with an average low of 22°F (-6°C).
How much does it rain in Waterloo?
About 43.6 inches (1,107 mm) a year; the wettest month is April.
Does it snow in Waterloo?
Yes, about 9 inches of snow fall in an average year.
When is the best time to visit Waterloo?
May and August to October, when temperatures are most pleasant and rainy days are fewer.
What climate does Waterloo have?
Hot-summer humid continental (Köppen Dfa).
What is the weather like in Waterloo in November?
Highs average 56°F and lows 35°F, with about 3.5 inches of precipitation.
What time is sunrise in Waterloo?
Around 6:40 AM in mid-November, and sunset around 4:49 PM. Today’s exact times are shown above.
Where does this Waterloo weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Waterloo.
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