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

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


August is the month with the warmest water temperature at 76.1°F / 24.5°C. The month with the coldest is March with an average water temperature of 32.7°F / 0.4°C.


Lake Ontario weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Oct. 26
Heavy rain
54 °F
50°F
12 °C
10°C
6mph (10km/h)
southwest
2in (50mm)
100 %
95%
Oct. 27
Scattered clouds
55 °F
51°F
13 °C
11°C
5mph (8km/h)
north-northeast
0in (0mm)
15 %
72%
Oct. 28
Scattered clouds
54 °F
46°F
12 °C
8°C
4mph (6km/h)
east-northeast
0in (0mm)
0 %
80%
Oct. 29
Moderate rain
56 °F
47°F
13 °C
8°C
4mph (7km/h)
east-southeast
1in (14mm)
95 %
79%
Oct. 30
Overcast clouds
56 °F
48°F
14 °C
9°C
4mph (6km/h)
east-southeast
0in (1mm)
55 %
86%
Oct. 31
Broken clouds
55 °F
48°F
13 °C
9°C
2mph (4km/h)
west-southwest
0in (1mm)
45 %
87%
Nov. 01
Broken clouds
50 °F
45°F
10 °C
7°C
3mph (5km/h)
west
0in (0mm)
20 %
69%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Nov. 02
Heavy rain
47 °F
41°F
8 °C
5°C
2mph (4km/h)
south-southwest
1in (22mm)
95 %
82%
Nov. 03
Broken clouds
52 °F
38°F
11 °C
3°C
5mph (8km/h)
west-southwest
0in (3mm)
75 %
72%
Nov. 04
Overcast clouds
55 °F
40°F
13 °C
5°C
4mph (7km/h)
southwest
0in (0mm)
0 %
66%
Nov. 05
Broken clouds
57 °F
40°F
14 °C
5°C
4mph (6km/h)
west
0in (0mm)
20 %
61%
Nov. 06
Broken clouds
50 °F
37°F
10 °C
3°C
3mph (4km/h)
northwest
0in (0mm)
20 %
64%
Nov. 07
Overcast clouds
48 °F
36°F
9 °C
2°C
3mph (5km/h)
south-southeast
0in (0mm)
0 %
70%
Nov. 08
Overcast clouds
57 °F
50°F
14 °C
10°C
3mph (5km/h)
southwest
0in (1mm)
45 %
78%
Nov. 09
Overcast clouds
52 °F
46°F
11 °C
8°C
3mph (6km/h)
west
0in (3mm)
70 %
88%
Nov. 10
Overcast clouds
48 °F
43°F
9 °C
6°C
7mph (12km/h)
west
0in (1mm)
55 %
69%

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%
July is the driest at 0in / 0mm and December the wettest month with 5.1in / 130.8mm. With an average temperature of 71.8°F / 22.1°C, August is the warmest month in a year. February is the coldest with 26.1°F / -3.3°C average temperature.

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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