Current Sea Water Temperature:
+43.0°F
| Maximum Sea Water Temperature in May: | 59.8°F |
| Minimum Sea Water Temperature in May: | 38.8°F |
| Average water temperature in May: | 45.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 19 | 43.0°F | May 14 | 40.0°F |
| May 18 | 41.8°F | May 13 | 40.8°F |
| May 17 | 41.6°F | May 12 | 40.2°F |
| May 16 | 41.0°F | May 11 | 40.0°F |
| May 15 | 40.4°F | May 10 | 39.6°F |
When is the Warmest Sea for Oshawa?
According to our data for the last three years for Oshawa the highest average sea water temperature was in August, September and July.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Oshawa was 75.7°F. The maximum and minimum values were 71.4°F and 80.8°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Oshawa was 66.8°F. The maximum and minimum values were 58.4°F and 70.0°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Oshawa was 69.0°F. The maximum and minimum values were 61.6°F and 77.2°F respectively.
Canada Resorts:
NAME
F°
| Bonavista |  |
+38 |
| Halifax |  |
+52 |
| Les Iles-de-la-Madeleine | |
+44 |
| Montreal |  |
+74 |
| Ottawa | |
+74 |
| Prince Edward Island | |
+52 |
| Quebec | |
+52 |
| Saint John | |
+48 |
| Sydney |  |
+42 |
| Thunder Bay | |
+40 |
| Tofino | |
+52 |
| Toronto | |
+72 |
| Vancouver | |
+52 |
| Victoria | |
+50 |
| Winnipeg | |
+40 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Oshawa
Local time: 09:21
19 may, tuesday
| 1200 |  |
82°F | NE 18 mph |
| 1500 | |
88°F | NE 17 mph |
| 1800 |  |
74°F | NE 15 mph |
| 2100 | |
64°F | NE 11 mph |
20 may, wednesday
| 0000 | |
62°F | NE 11 mph |
| 0300 | |
56°F | SE 17 mph |
| 0600 |  |
50°F | SE 19 mph |
| 0900 | |
50°F | SE 17 mph |