Climate Insights for Waterloo

The climate in Waterloo is temperate. The average annual temperature is 10°C and approximately 1098mm of precipitation falls per year. September is the wettest month, receiving around 212mm of rainfall. Waterloo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, December, February, when temperatures can drop to -12°C. Snowfall occurs from January to December, with around 99cm accumulating over the season.

Waterloo has a wide annual temperature range, spanning 41°C from the coldest to warmest months. The warmest month is June, when average highs reach 29°C and the mean temperature sits around 23°C. The coldest month is January, when overnight lows fall to -12°C and the daily average is -8°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 13°C shift in average temperatures.

Waterloo is a moderately rainy area, receiving approximately 1098mm of precipitation annually, which averages out to around 92mm per month. The wettest month is September, averaging 212mm of rainfall. August and May also tend to see above-average precipitation. The driest month is January, with just 27mm. That's 185mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 99cm accumulating over the season. December typically sees the most snow at around 43cm.

Waterloo is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Waterloo, which began on June 21, 2026. Waterloo is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in June at around 29°C, while the coldest stretch bottoms out in January near -12°C. Autumn is next, beginning on September 23, 2026 — 51 days from now.

The best time to visit Waterloo is during June, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 92mm per month. By contrast, January can be quite cold with temperatures dropping to -12°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Waterloo based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.