Oshawa weather
Best months for weather: May–Sep. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Oshawa, Ontario, Canada.
Best Time to Visit
Peak season May–SepOff season Nov–Apr
Oshawa weather by month
When is the best time to visit Oshawa?
Based on weather alone, the best time to visit Oshawa is May–Sep, according to NASA's 2001–2025 climate averages. Nov–Apr tends to be the least pleasant. Average highs run from -2°C (28°F) in January to 27°C (81°F) in July.
What is the rainiest month in Oshawa?
April is the wettest month, with about 68 mm (2.7 in) of rain on average. February is the driest, with about 47 mm (1.9 in).
What is the hottest month in Oshawa?
July is the warmest, with average highs of 27°C (81°F) and lows of 17°C (62°F). January is the coolest, with highs of -2°C (28°F) and lows of -9°C (15°F).
Does Oshawa have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is April at about 68 mm (2.7 in).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months