What’s the climate like in Waterloo?
The current climate of Waterloo features average monthly temperatures ranging from highs of 32°C during the day to lows of 5°C. The average yearly temperature is around 20°C. At night, temperatures in the colder months average around -4°C and in the warmer months around 21°C.
The highest temperature recorded in Waterloo in recent years was 39°C in August 2023. The lowest daytime temperature recorded was -17°C in January 2014.
On average, Waterloo gets 1878 mm of precipitation each year. Of this, about 23 cm is snowfall. For comparison, London gets 701 mm of precipitation each year.
Best time to visit Waterloo?
The best time to visit Waterloo for pleasant to warm weather is May, June and August through October. There might be some rain during this period, but the temperatures are just right for exploring Waterloo.
Climate Table of Waterloo
The climate table of Waterloo shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp. max (°C) | 5 | 7 | 14 | 19 | 25 | 31 | 32 | 30 | 29 | 21 | 13 | 9 |
| Temp. min (°C) | -3 | -3 | 4 | 8 | 15 | 20 | 22 | 20 | 17 | 9 | 3 | 0 |
| Precipitation |  |
|
|
|
|
|
|
|
|
|
|
|
| Precipitation (mm) | 113 | 105 | 141 | 234 | 153 | 142 | 239 | 196 | 88 | 172 | 156 | 139 |
| Snow (cm) | 4,6 | 8,6 | 1,8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3,5 | 4,3 |
| UV Index | 1 | 4 | 6 | 4 | 6 | 7 | 8 | 7 | 6 | 3 | 3 | 1 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 20°C
- Highest temperature: 32°C in July
- Lowest temperature: 5°C in January
- Precipitation*: 1878 mm per year, averaging 157 mm per month
- Snowfall: 23 cm per year
- Driest months: 88 mm in September, 105 mm in February and 113 mm in January
- Wettest months: 239 mm in July, 234 mm in April and 196 mm in August
*Precipitation is measured as a combination of rain, snow, and hail
Plan your next holiday
Don’t miss the best holiday deals for Waterloo and see what our partners have for you.
Table of Contents
Average Temperature per Month in Waterloo
This graph shows the average maximum temperatures per month in Waterloo, Illinois. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Waterloo
This graph shows how much precipitation Waterloo, Illinois, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Waterloo
This graph shows how much snow Waterloo, Illinois, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Waterloo
This graph shows the average UV index per month in Waterloo, Illinois. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Waterloo
This graph shows the average yearly temperature in Waterloo, Illinois. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Waterloo
This chart shows the total yearly precipitation in Waterloo, Illinois, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Waterloo
This chart shows the total yearly snowfall in Waterloo, Illinois, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Waterloo
Have you been to Waterloo?
Share your weather experiences in Waterloo.
Average Weather in Waterloo by Month
Click on a month below to see detailed weather info for Waterloo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
