Measurements:
°C
°F
CURRENT WEATHER
17:30
Oshawa
74°F
N 6 mph
Feels like: 74°F
Precip: 22%
World Resorts Canada Oshawa Weather

7 Day Weather Forecast

09.08
tue
DAY
74°F
N 3 mph
precip
19%
NIGHT
66°F
W 4 mph
precip
30%
09.09
wed
DAY
68°F
N 7 mph
precip
66%
NIGHT
66°F
E 7 mph
precip
38%
09.10
thu
DAY
68°F
SE 19 mph
precip
11%
NIGHT
52°F
S 9 mph
precip
5%
09.11
fri
DAY
68°F
E 6 mph
precip
1%
NIGHT
54°F
NW 4 mph
precip
10%
09.12
sat
DAY
70°F
N 8 mph
precip
4%
NIGHT
64°F
NW 4 mph
precip
24%
09.13
sun
DAY
78°F
NE 6 mph
precip
17%
NIGHT
62°F
NE 9 mph
precip
40%
09.14
mon
DAY
68°F
S 6 mph
precip
3%
NIGHT
62°F
W 7 mph
precip
15%

Oshawa Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Oshawa was 18.4°F. The maximum and minimum values were 14.2°F and 20.0°F respectively.

Oshawa on the Weather Map

Best Time to Visit Oshawa
The most sunny months:
September 15 days
August 14 days
July 14 days
The most warm months:
July 79.8 °F
August 78.1 °F
June 72.8 °F
Warmest sea temperature:
August 72.5 °F
September 69.3 °F
July 68.3 °F
The most cold months:
January 24.0 °F
February 25.1 °F
December 31.8 °F
The most rainy months:
July 3 days
April 2 days
August 2 days
The most windy months:
December 11 mph
November 11 mph
January 11 mph
more details