Lake Ontario Water Temperature

Lake Ontario is nestled right between the Canadian province of Ontario and New York state. It is Canada’s most populated territory and its fourth largest by area. Ontario boasts over 250,000 lakes – holding about one third of the world’s fresh water.

The city is a multicultural centre holding annual events such as the Canadian Aboriginal Festival, Caribbean Carnival and their very own Oktoberfest.

Lake Ontario is a town close to Lake Ontario. August is the month with the hottest water temperature at 76.1°F / 24.5°C. The coldest month is March with an ø water temperature of 32.7°F / 0.4°C. July is the month with the lowest precipitation of 0in / 0mm and December with the highest precipitation in a year with 5.1in / 130.8mm. The avg. air temperature is around 71.8°F / 22.1°C, August is the month with the highest temperature. February is the coolest with 26.1°F / -3.3°C average air temperature. June, July, August, September would be the best time to visit. Warm-summer humid continental climate would be the climate here.

Lake Ontario Summary

Description	Value
Warmest Month Water Temperature:	August with 76.1°F / 24.5°C
Coldest Month Water Temperature:	March with 32.7°F / 0.4°C
Warmest Month Air Temperature:	August with 71.8°F / 22.1°C
Coldest Month Air Temperature:	February with 26.1°F / -3.3°C
Wettest Month:	December with 5.1in / 130.8mm
Driest Month:	July with 0in / 0mm
Highest Humidity	June with 85.7%
Lowest Humidity	October with 72%
Best Time to Visit:	June, July, August, September
Climate Classification	Warm-summer humid continental climate

Lake Ontario water temperature by month

°F

Lake Ontario water temperature by month

	Max. Water Temperature (°F)	ø. Water Temperature (°F)	Min. Water Temperature (°F)
January	40.1	37.4	34.5
February	34.7	33.4	32.7
March	33.3	32.7	32.4
April	38.3	35.8	33.4
May	50.7	43.2	38.5
June	66	57.2	49.8
July	75.7	69.4	62.2
August	77	73.9	71.2
September	75.7	70.2	64.9
October	66.2	59.2	52.7
November	53.2	48.7	45
December	45	42.4	40.3

°C

Lake Ontario water temperature by month

	Max. Water Temperature (°C)	ø. Water Temperature (°C)	Min. Water Temperature (°C)
January	4.5	3	1.4
February	1.5	0.8	0.4
March	0.7	0.4	0.2
April	3.5	2.1	0.8
May	10.4	6.2	3.6
June	18.9	14	9.9
July	24.3	20.8	16.8
August	25	23.3	21.8
September	24.3	21.2	18.3
October	19	15.1	11.5
November	11.8	9.3	7.2
December	7.2	5.8	4.6

The hottest water temperature typically reached in August with around 76.1°F / 24.5°C. The coldest in March with an average water temperature of 32.7°F / 0.4°C.

Lake Ontario weather today & 14-day weather forecast

7-day weather forecast
+9-day forecast

7-day weather forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 10	Overcast clouds	45 °F 39°F	7 °C 4°C	3mph (5km/h) west	0in (1mm) 40 %	85%
Dec. 11	Sleet	37 °F 33°F	3 °C 1°C	5mph (8km/h) west-northwest	0in (2mm) 55 %	78%
Dec. 12	Mix snow/rain	44 °F 31°F	7 °C -0°C	4mph (7km/h) southwest	0in (0mm) 0 %	68%
Dec. 13	Mix snow/rain	36 °F 29°F	2 °C -1°C	6mph (9km/h) west	0in (0mm) 0 %	68%
Dec. 14	Mix snow/rain	39 °F 28°F	4 °C -3°C	5mph (8km/h) west	0in (0mm) 0 %	67%
Dec. 15	Scattered clouds	46 °F 36°F	8 °C 2°C	6mph (9km/h) west-southwest	0in (0mm) 20 %	68%
Dec. 16	Light shower rain	43 °F 40°F	6 °C 4°C	4mph (6km/h) south-southwest	0in (2mm) 50 %	75%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 17	Scattered clouds	44 °F 38°F	7 °C 4°C	5mph (8km/h) south-southeast	0in (0mm) 0 %	76%
Dec. 18	Mix snow/rain	43 °F 35°F	6 °C 1°C	7mph (11km/h) southeast	1in (17mm) 90 %	92%
Dec. 19	Heavy snow	31 °F 22°F	-1 °C -5°C	9mph (14km/h) northwest	1in (15mm) 100 %	88%
Dec. 20	Light snow	30 °F 23°F	-1 °C -5°C	8mph (13km/h) west-northwest	0in (1mm) 70 %	69%
Dec. 21	Light snow	33 °F 30°F	0 °C -1°C	8mph (13km/h) west-southwest	0in (4mm) 95 %	77%
Dec. 22	Light snow	33 °F 32°F	0 °C 0°C	3mph (4km/h) west	0in (1mm) 65 %	68%
Dec. 23	Broken clouds	40 °F 29°F	5 °C -2°C	5mph (7km/h) south-southeast	0in (0mm) 0 %	77%
Dec. 24	Light rain	44 °F 39°F	7 °C 4°C	6mph (9km/h) south-southeast	0in (9mm) 80 %	86%
Dec. 25	Heavy rain	43 °F 40°F	6 °C 5°C	4mph (7km/h) east	1in (29mm) 95 %	98%

Lake Ontario weather by month / climate table

°F

	Max. Temperature °F	ø. Temperature °F	Min. Temperature (°F)	Precip. (in)	Rainy Days (d)	Rel. Humidity (%)
January	36.9	27.7	18.1	4.4	18	75.1%
February	33.6	26.1	17.4	2.1	3	75.6%
March	39.2	30.4	20.5	0.4	0	77%
April	45.1	38.5	31.3	0.4	3	79.2%
May	55.8	46.8	40.5	0.3	1	85.4%
June	68.2	59.2	51.1	0.7	1	85.7%
July	74.8	69.8	63.5	0	0	78.7%
August	76.5	71.8	67.3	0.1	0	73.8%
September	73.9	66.7	59.2	0.2	1	72.2%
October	64	54.9	45.7	1.8	0	72%
November	54.1	44.1	36.9	1.4	5	72.7%
December	43	35.1	28.9	5.1	18	74.2%

°C

	Max. Temperature °C	ø. Temperature °C	Min. Temperature (°C)	Precip. (mm)	Rainy Days (d)	Rel. Humidity (%)
January	2.7	-2.4	-7.7	112.9	18	75.1%
February	0.9	-3.3	-8.1	54.5	3	75.6%
March	4	-0.9	-6.4	11.4	0	77%
April	7.3	3.6	-0.4	9.1	3	79.2%
May	13.2	8.2	4.7	8.3	1	85.4%
June	20.1	15.1	10.6	17.2	1	85.7%
July	23.8	21	17.5	0	0	78.7%
August	24.7	22.1	19.6	2.3	0	73.8%
September	23.3	19.3	15.1	6.2	1	72.2%
October	17.8	12.7	7.6	45.3	0	72%
November	12.3	6.7	2.7	34.3	5	72.7%
December	6.1	1.7	-1.7	130.8	18	74.2%

The warmest avg. temperature is around 71.8°F / 22.1°C, August is the month with the highest temperature. February is the coolest with 26.1°F / -3.3°C average air temperature. July is the month with the min. precipitation of 0in / 0mm and December with the max. precipitation in a year with 5.1in / 130.8mm.

The best time of year to visit Ontario and its many lakes would be between late May and mid-October. At this time the average water temperature of the area is consistently above 62°F, so going for a swim will not require thermal wetsuits!

The lake area has great accessibility by car, train and coach, the nearest domestic airports are Toronto City and Niagara International.

Activities & POI in Lake Ontario

Type of Activity	List
Attraction	Strewn Winery, Olde Towne Gardens

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