The highest day temperature in July 2025 was 92°F. The lowest night temperature was 54°F. The average values for day and night temperatures during July were 82.4°F и 66.0°F respectivly.

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.

Most of the days in July are cloudy but you can also expect sunny or gloomy days.

Precipitation total in July for Oshawa is 1.3 in. It makes july the most rainy month of the year.

The average wind speed in July is 7.2 mph. It makes July the most windless month of the year for Oshawa.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Oshawa in July is 9.2 hours.