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Monthly climate in Waterloo, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Waterloo features a humid continental climate (Dfb). Temperatures typically range between -5 °C (23 °F) and 21 °C (71 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 33 °C (91 °F). The average annual precipitation amounts to about 1027 mm (40.4 inches) and receives 145 rainy days on the 1 mm (0.04 inches) threshold annually. Waterloo enjoys an average of 2785 hours of sunshine throughout the year, and daylight varies from 8 hours 59 minutes to 15 hours 20 minutes per day.

Monthly average temperatures in Waterloo, Canada

The warmest months in Waterloo are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -2 °C (23 - 29 °F) throughout the day. On average each year, Waterloo experiences 48 days above 25 °C (77.0 °F) and 135 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Waterloo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(53°F)		15°C
(60°F)		19°C
(66°F)		25°C
(78°F)		31°C
(89°F)		33°C
(91°F)		33°C
(91°F)		31°C
(88°F)		31°C
(88°F)		28°C
(82°F)		22°C
(72°F)		15°C
(60°F)
Mean maximum8°C
(47°F)		11°C
(52°F)		17°C
(62°F)		21°C
(71°F)		29°C
(85°F)		31°C
(88°F)		31°C
(88°F)		30°C
(86°F)		29°C
(84°F)		25°C
(78°F)		16°C
(60°F)		11°C
(52°F)
Average high-2°C
(29°F)		-1°C
(31°F)		4°C
(40°F)		10°C
(51°F)		18°C
(65°F)		23°C
(74°F)		26°C
(79°F)		25°C
(77°F)		21°C
(71°F)		14°C
(58°F)		6°C
(42°F)		1°C
(34°F)
Daily mean-5°C
(23°F)		-5°C
(24°F)		-0°C
(32°F)		5°C
(42°F)		13°C
(56°F)		18°C
(66°F)		21°C
(71°F)		20°C
(69°F)		16°C
(62°F)		10°C
(50°F)		2°C
(36°F)		-2°C
(29°F)
Average low-9°C
(16°F)		-9°C
(16°F)		-5°C
(24°F)		1°C
(34°F)		8°C
(46°F)		13°C
(56°F)		16°C
(62°F)		15°C
(60°F)		11°C
(53°F)		6°C
(43°F)		-2°C
(29°F)		-5°C
(24°F)
Mean minimum-22°C
(-7°F)		-20°C
(-4°F)		-16°C
(3°F)		-5°C
(23°F)		-1°C
(31°F)		8°C
(47°F)		11°C
(53°F)		9°C
(49°F)		4°C
(40°F)		-2°C
(29°F)		-13°C
(8°F)		-15°C
(6°F)
Minimum-26°C
(-14°F)		-25°C
(-13°F)		-22°C
(-7°F)		-7°C
(19°F)		-4°C
(26°F)		4°C
(39°F)		10°C
(50°F)		6°C
(43°F)		-0°C
(32°F)		-3°C
(27°F)		-21°C
(-6°F)		-26°C
(-14°F)

Compare climate in Waterloo with other places

Compare temperature, precipitation, sunshine, UV index in Waterloo, Canada with other places around the world.

Monthly average precipitation in Waterloo, Canada

Waterloo usually has the most precipitation in April, June and October, with an average of 13 rainy days and 103 mm (4.0 inches) of precipitation per month. The driest months in Waterloo are January, March and December. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Waterloo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)73 (2.9)77 (3.0)67 (2.6)100 (3.9)98 (3.8)104 (4.1)75 (3.0)97 (3.8)75 (3.0)104 (4.1)83 (3.3)74 (2.9)
Average precipitation days (≥ 1 mm)101210141311121210141314

Monthly sunshine hours in Waterloo, Canada

The sunniest months in Waterloo are June, July and August, when the sun shines an average of 11 hours 4 minutes a day. Least sunny months in Waterloo: January, November and December receive an average of 3 hours 54 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Waterloo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours101150228237292335348335297201145111
Mean daily daylight hours9h 21m10h 30m11h 58m13h 27m14h 43m15h 20m15h 0m13h 52m12h 26m10h 57m9h 39m8h 59m

Solar UV radiation in Waterloo, Canada

Waterloo experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure. January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Waterloo UV Index data.

Average daily maximum UV levels by month for Waterloo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)2458910997532