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

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

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Lake Ontario water temperature by month

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

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.

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Lake Ontario weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 18
Few clouds
74 °F
65°F
24 °C
19°C
3mph (5km/h)
west-northwest
0in (0mm)
0 %
73%
Jul. 19
Few clouds
76 °F
64°F
25 °C
18°C
2mph (3km/h)
west-northwest
0in (0mm)
0 %
69%
Jul. 20
Few clouds
80 °F
63°F
26 °C
17°C
2mph (3km/h)
west-southwest
0in (0mm)
0 %
70%
Jul. 21
Scattered clouds
78 °F
66°F
26 °C
19°C
1mph (2km/h)
southwest
0in (0mm)
0 %
74%
Jul. 22
Broken clouds
80 °F
67°F
27 °C
20°C
1mph (2km/h)
east-southeast
0in (0mm)
0 %
72%
Jul. 23
Overcast clouds
74 °F
69°F
23 °C
20°C
2mph (3km/h)
east-northeast
0in (0mm)
0 %
78%
Jul. 24
Moderate rain
72 °F
69°F
22 °C
21°C
2mph (3km/h)
east
0in (11mm)
80 %
87%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 25
Moderate rain
72 °F
70°F
22 °C
21°C
2mph (3km/h)
south
0in (7mm)
70 %
88%
Jul. 26
Light rain
73 °F
70°F
23 °C
21°C
2mph (4km/h)
west
0in (5mm)
60 %
86%
Jul. 27
Scattered clouds
74 °F
71°F
23 °C
22°C
1mph (2km/h)
southwest
0in (0mm)
15 %
79%
Jul. 28
Broken clouds
80 °F
69°F
26 °C
20°C
2mph (3km/h)
west-northwest
0in (0mm)
20 %
74%
Jul. 29
Thunderstorm with rain
79 °F
67°F
26 °C
20°C
4mph (6km/h)
southwest
0in (5mm)
60 %
87%
Jul. 30
Thunderstorm with rain
84 °F
71°F
29 °C
22°C
5mph (7km/h)
west-southwest
0in (11mm)
80 %
86%
Jul. 31
Broken clouds
81 °F
70°F
27 °C
21°C
3mph (5km/h)
west-southwest
0in (1mm)
30 %
89%
Aug. 01
Clear Sky
85 °F
70°F
29 °C
21°C
2mph (3km/h)
south
0in (0mm)
0 %
81%
Aug. 02
Few clouds
84 °F
71°F
29 °C
21°C
1mph (2km/h)
southeast
0in (0mm)
10 %
87%

Lake Ontario weather by month / climate table

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%

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

Picture Copyright: Flickr CC 2.0  Life is a wonder 

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