The highest day temperature in January 2026 was 44°F. The lowest night temperature was -15°F. The average values for day and night temperatures during January were 20.1°F и 13.3°F respectivly.

The average sea surface temperature in January 2026 for Oshawa was 35.4°F. The maximum and minimum values were 33.2°F and 36.8°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Oshawa is 0.9 in.

The average wind speed in January is 11.7 mph. It makes January one of the most windy months 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 January is 3.3 hours.