Waterloo, Ontario Weather by Month and Climate Averages

How much rain does Waterloo get?

Waterloo gets 751 mm of precipitation in an average year, spread over about 135 days with measurable rain. That is more rainy days than 60% of Canada.

October is the wettest month, with 86 mm. February is the driest, with 32 mm. October has the most rainy days, about 16.

The longest dry spell in the last five years lasted 19 days, to June 8, 2023.

Waterloo weather by month

Waterloo weather in January

In January, Waterloo averages a high of -2°C and a low of -10°C. It gets 46 mm of precipitation over about 11 rainy days. The sun is out about 15% of daylight hours. The January record high is 13°C (2013) and the record low is -29°C (2022).

Waterloo weather in February

In February, Waterloo averages a high of -2°C and a low of -11°C. It gets 32 mm of precipitation over about 10 rainy days. The sun is out about 28% of daylight hours. The February record high is 17°C (2017) and the record low is -34°C (2015).

Waterloo weather in March

In March, Waterloo averages a high of 4°C and a low of -6°C. It gets 46 mm of precipitation over about 9 rainy days. The sun is out about 31% of daylight hours. The March record high is 27°C (2012) and the record low is -25°C (2014).

Waterloo weather in April

In April, Waterloo averages a high of 11°C and a low of -1°C. It gets 72 mm of precipitation over about 12 rainy days. The sun is out about 35% of daylight hours. The April record high is 28°C (2023) and the record low is -15°C (2016).

Waterloo weather in May

In May, Waterloo averages a high of 19°C and a low of 6°C. It gets 70 mm of precipitation over about 11 rainy days. The sun is out about 42% of daylight hours. The May record high is 33°C (2012) and the record low is -4°C (2020). May is one of the most comfortable months to visit.

Waterloo weather in June

In June, Waterloo averages a high of 24°C and a low of 11°C. It gets 78 mm of precipitation over about 12 rainy days. The sun is out about 47% of daylight hours. The June record high is 34°C (2018) and the record low is 1°C (2025). June is one of the most comfortable months to visit.

Waterloo weather in July

In July, Waterloo averages a high of 28°C and a low of 14°C. It gets 76 mm of precipitation over about 10 rainy days. The sun is out about 49% of daylight hours. The July record high is 36°C (2011) and the record low is 6°C (2010).

Waterloo weather in August

In August, Waterloo averages a high of 26°C and a low of 13°C. It gets 68 mm of precipitation over about 12 rainy days. The sun is out about 47% of daylight hours. The August record high is 33°C (2012) and the record low is 4°C (2025). August is one of the most comfortable months to visit.

Waterloo weather in September

In September, Waterloo averages a high of 22°C and a low of 9°C. It gets 76 mm of precipitation over about 12 rainy days. The sun is out about 49% of daylight hours. The September record high is 34°C (2013) and the record low is -3°C (2020). September is one of the most comfortable months to visit.

Waterloo weather in October

In October, Waterloo averages a high of 14°C and a low of 3°C. It gets 86 mm of precipitation over about 16 rainy days. The sun is out about 36% of daylight hours. The October record high is 30°C (2019) and the record low is -9°C (2020).

Waterloo weather in November

In November, Waterloo averages a high of 7°C and a low of -2°C. It gets 52 mm of precipitation over about 11 rainy days. The sun is out about 33% of daylight hours. The November record high is 24°C (2022) and the record low is -17°C (2019).

Waterloo weather in December

In December, Waterloo averages a high of 1°C and a low of -6°C. It gets 47 mm of precipitation over about 12 rainy days. The sun is out about 16% of daylight hours. The December record high is 16°C (2021) and the record low is -28°C (2017).

Sunshine, humidity and wind in Waterloo

July is the sunniest month in Waterloo, with sunshine about 49% of daylight hours. January is the cloudiest, at 15%. Over the year the sun shines about 36% of daylight hours. Waterloo is cloudier than 56% of Canada.

Humidity peaks in January at 82% and is lowest in May at 60%.

Waterloo has about 5 days a year above 32°C. Waterloo is hotter than 65% of Canada.

First and last freeze in Waterloo

The first fall freeze in Waterloo typically comes around October 10, and the last spring freeze around May 9. That leaves a frost-free growing season of about 154 days.

Waterloo weather records

The hottest temperature on record at the Waterloo station is 36°C, on July 21, 2011. The coldest is -34°C, on February 16, 2015.

The wettest day on record brought 61 mm of rain, on July 23, 2010.

The best time to visit Waterloo

The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 23°C.

Winter (December–February) is cold, with average highs around -1°C and lows near -9°C.

Spring (March–May) is chilly, with average highs around 12°C and lows near 0°C.

Summer (June–August) is warm, with average highs around 26°C and lows near 13°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 15°C and lows near 3°C.

Waterloo climate questions

How much rain does Waterloo get?

Waterloo gets 751 mm of precipitation in an average year, over about 135 rainy days.

What is the wettest month in Waterloo?

October is the wettest month in Waterloo, with 86 mm. February is the driest, with 32 mm.

How many rainy days does Waterloo have a year?

Waterloo has about 135 days with measurable rain in an average year. October has the most, about 16.

What is the hottest month in Waterloo?

July is the warmest month in Waterloo, with an average high of 28°C.

What is the coldest month in Waterloo?

February is the coldest month in Waterloo, with an average low of -11°C.

What is the record high temperature in Waterloo?

The record high at the Waterloo station is 36°C, set on July 21, 2011. The record low is -34°C, on February 16, 2015.

What is the sunniest month in Waterloo?

July is the sunniest month in Waterloo, with sunshine about 49% of daylight hours. January is the cloudiest.

When is the first frost in Waterloo?

The first fall freeze in Waterloo typically comes around October 10. The last spring freeze is around May 9.

What is the best time to visit Waterloo?

The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 23°C.