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Waterloo Weather by Month
Average temperatures, rainfall and humidity for Waterloo, Canada, month by month, built from OpenWeather's historical records. Use it to see what a typical Waterloo month looks like before you travel — then check the live Waterloo forecast for the days ahead.
Warmest month
July
27°C average high
Coolest month
February
-9°C average low
Wettest month
June
72 mm of rain
Driest month
February
13 mm of rain
Average temperature and rainfall in Waterloo by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | -2°C | -8°C | -28°C / 12°C | 24 mm | 85% | 16 km/h |
| February | -1°C | -9°C | -30°C / 17°C | 13 mm | 82% | 17 km/h |
| March | 5°C | -4°C | -24°C / 21°C | 31 mm | 77% | 16 km/h |
| April | 12°C | 2°C | -11°C / 28°C | 61 mm | 72% | 16 km/h |
| May | 20°C | 8°C | -4°C / 31°C | 55 mm | 70% | 13 km/h |
| June | 24°C | 14°C | 3°C / 36°C | 72 mm | 73% | 12 km/h |
| July | 27°C | 16°C | 8°C / 36°C | 46 mm | 76% | 11 km/h |
| August | 26°C | 15°C | 4°C / 35°C | 55 mm | 79% | 11 km/h |
| September | 23°C | 12°C | -1°C / 34°C | 61 mm | 79% | 11 km/h |
| October | 15°C | 6°C | -6°C / 31°C | 63 mm | 82% | 13 km/h |
| November | 7°C | 0°C | -14°C / 23°C | 40 mm | 83% | 15 km/h |
| December | 2°C | -4°C | -25°C / 16°C | 31 mm | 86% | 16 km/h |
Best time to visit Waterloo
The most comfortable time to visit Waterloo is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 552 mm a year.
Travellers who prefer heat should aim for July, when highs average 27°C. June is the month to avoid if rain would spoil your plans — it averages 72 mm, roughly 6× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Waterloo forecast for what is happening now.