Ontario's July forecast for 2026 is in and here's what's in store

Summers in southern Ontario rarely stick to a single rhythm, and this July is shaping up to double down on that trend, as an early long-range outlook points to a month full of quick transitions between hot temperatures, thunderstorms, and plenty of precipitation.

The Old Farmer's Almanac released its long-range weather forecast for southern Ontario this week, which provides an early glimpse of how the beginning of summer will play out. Based on this forecast, your location alone could mean you'll experience a different version of summer, depending on whether you're east or west.

According to the outlook, the first week of July (including Canada Day) will bring a few thunderstorms, followed by sunny skies and hot weather.

Isolated thunderstorms will likely stretch into the week of July 8-12, but thankfully, warm temperatures will remain. Between July 13 and 15, we can expect more thunderstorms in the east, but sunny and warm conditions in the west.

That variability will continue through July 16 to 25, when the east will likely experience cooler temperatures, and the west will be treated to sunny skies and warm temperatures. Between July 26 and 31, we can expect a few additional thunderstorms alongside warm temperatures.

Overall, the average temperature in southern Ontario in July is expected to be 21 C, which is 1 C below average in the east, and 1 C above average in the west. Total precipitation amounts are estimated to be around 95 mm, which is 70 mm above in the east and 40 mm below in the west.

Over the weekend, Environment and Climate Change Canada (ECCC) also released its three-month temperature and precipitation probabilistic forecasts, which cover the period between June and August 2026.

Based on these models, temperature trends are expected to vary across Canada throughout the summer season, with most regions, including southern Ontario, projected to see above-average warmth.

The Almanac's outlook closely mirrors The Weather Network's summer 2026 forecast, which characterized the upcoming summer season as "changeable," "reactive," "noncommittal," and "inconsistent."

Considering all the outlooks and forecasts, it looks like July in southern Ontario will be layered as opposed to offering a steady stretch of summer. Warm temperatures are expected to dominate overall, but thunderstorms and regional splits might define your day-to-day experience more than any single seasonal average.