Climate averages 1991–2020
Thornhill weather
in July.
A warm, moderately wet month: the warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Thornhill: daytime highs average 25.5°C and nights cool to about 17.5°C. By daytime temperature it is the warmest month of the year.
Expect about 71 mm of rain on roughly 10 days, which makes July a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 06 min on an average July day.
The nearest other city in this atlas is Richmond Hill (6 km away). In July its highs average 25.7°C, about as warm as Thornhill, with 71 mm of rain.
Among the 86 cities listed in Canada, Thornhill ranks joint 34th of 86 for the warmest July highs and joint 22nd of 86 for the driest July (rainfall, lowest first). The mean July high of those 86 cities is 24.4°C; Thornhill is 1.2°C warmer than that mean.
From July to August, average highs fall by 0.7°C to 24.8°C, and monthly rainfall falls from 71 mm to 65 mm.
The annual picture
July in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Thornhill climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.4°C-8.6°C | -8.6°C | 60 | 10.2 | 9.39 h |
| February | -0.8°C-9.2°C | -9.2°C | 49 | 7.9 | 10.410 h |
| March | 3.8°C-4.6°C | -4.6°C | 57 | 9.5 | 11.912 h |
| April | 10.2°C1.8°C | 1.8°C | 77 | 10.7 | 13.413 h |
| May | 16.9°C8.2°C | 8.2°C | 72 | 10.1 | 14.715 h |
| June | 22.4°C14.2°C | 14.2°C | 77 | 10.6 | 15.415 h |
| July, selected | 25.5°C17.5°C | 17.5°C | 71 | 9.6 | 15.115 h |
| August | 24.8°C17.2°C | 17.2°C | 65 | 8.8 | 14.014 h |
| September | 21.0°C13.7°C | 13.7°C | 69 | 8.7 | 12.613 h |
| October | 14.0°C7.5°C | 7.5°C | 75 | 10.5 | 11.111 h |
| November | 7.1°C1.4°C | 1.4°C | 67 | 10.0 | 9.710 h |
| December | 1.7°C-4.0°C | -4.0°C | 61 | 10.0 | 9.09 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Richmond Hill in JulyCanada · 6 kmHigh 25.7°C · Low 16.7°C · 71 mm rain
- Vaughan in JulyCanada · 6 kmHigh 25.7°C · Low 16.9°C · 71 mm rain
- Toronto in JulyCanada · 12 kmHigh 25.0°C · Low 17.8°C · 71 mm rain
- Markham in JulyCanada · 14 kmHigh 25.7°C · Low 17.2°C · 68 mm rain
- Etobicoke in JulyCanada · 22 kmHigh 25.7°C · Low 17.7°C · 71 mm rain
- Pickering in JulyCanada · 25 kmHigh 24.7°C · Low 17.3°C · 88 mm rain
- Newmarket in JulyCanada · 26 kmHigh 25.8°C · Low 16.5°C · 84 mm rain
- Brampton in JulyCanada · 31 kmHigh 26.2°C · Low 16.7°C · 79 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Thornhill) is explained once on the Thornhill year overview and on the Sources, method and limits page.
Toronto, Etobicoke and Vaughan lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.