August
Other strong months: June and September
80/100 weather score
Canada · 1991–2020
Best time to visit
Thornhill
For Thornhill, August has the most comfortable weather in our climate comparison. Typical daytime highs are 26.7°C, nights average 15.5°C, and rainfall totals about 77 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthAugust
Typical daytime high26.7°C
Typical night-time low15.5°C
August rainfall77 mm
July
Other strong months: August and June
68/100 weather score
May
Other strong months: September and October
79/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
5 months fit your choices for Thornhill
The lowest comfort score is 5 out of 100. January, February, March and December share that score. In January, that is mainly because days reach only -1°C, 25° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Thornhill?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Thornhill?
August is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 26.7°C and 77 mm of rain.
What is the hottest month in Thornhill?
July is hottest in this record, with a typical daytime high of 27.7°C and a night-time low of 16.2°C.
Which month has the least rain?
March has the lowest monthly rainfall total at 54 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | -1°C | -8.6°C | 66 mm | 10.5 | 3.7°C | 9 h 15 | 5 | Strong coverage |
| February | -0.1°C | -8.2°C | 56 mm | 8.5 | 2.9°C | 10 h 24 | 5 | Strong coverage |
| March | 5.2°C | -4.1°C | 54 mm | 8.7 | 2.9°C | 11 h 47 | 5 | Strong coverage |
| April | 12.2°C | 1.5°C | 80 mm | 9.9 | 3.8°C | 13 h 22 | 24 | Strong coverage |
| May | 19.7°C | 7.8°C | 83 mm | 9.4 | 7.3°C | 14 h 42 | 60 | Strong coverage |
| June | 25°C | 13.4°C | 97 mm | 9.6 | 14.9°C | 15 h 26 | 79 | Strong coverage |
| July | 27.7°C | 16.2°C | 84 mm | 8.7 | 19.9°C | 15 h 09 | 74 | Strong coverage |
| August | 26.7°C | 15.5°C | 77 mm | 7.6 | 21.2°C | 13 h 59 | 80 | Strong coverage |
| September | 22.6°C | 11.5°C | 79 mm | 7.8 | 19.1°C | 12 h 27 | 79 | Strong coverage |
| October | 14.8°C | 5.5°C | 74 mm | 9.5 | 13.1°C | 10 h 56 | 41 | Strong coverage |
| November | 7.9°C | 0.1°C | 70 mm | 9.3 | 7.5°C | 9 h 35 | 9 | Strong coverage |
| December | 1.9°C | -4.8°C | 66 mm | 9.7 | 4.9°C | 8 h 56 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.5°C13 Jan 2005 | -26.0°C14 Jan 1999 | 73 mm11 Jan 2020 | 145 mm2020 · driest 22 mm in 2021 | 28 |
| February | 17.0°C28 Feb 2018 | -26.5°C13 Feb 2016 | 33 mm11 Feb 2009 | 116 mm2008 · driest 18 mm in 1995 | 28 |
| March | 27.5°C22 Mar 2012 | -25.5°C3 Mar 2003 | 37 mm3 Mar 2023 | 128 mm2011 · driest 15 mm in 2015 | 29 |
| April | 30.0°C13 Apr 2023 | -12.0°C5 Apr 2016 | 41 mm3 Apr 2009 | 161 mm2018 · driest 32 mm in 2010 | 29 |
| May | 34.0°C29 May 2006 | -4.5°C13 May 2020 | 71 mm12 May 2000 | 152 mm2000 · driest 20 mm in 2021 | 28 |
| June | 36.0°C30 Jun 2018 | 2.0°C6 Jun 2009 | 65 mm17 Jun 2017 | 196 mm2010 · driest 38 mm in 2020 | 27 |
| July | 36.5°C21 Jul 2011 | 7.0°C5 Jul 2009 | 84 mm27 Jul 2014 | 178 mm2013 · driest 29 mm in 2015 | 27 |
| August | 37.5°C8 Aug 2001 | 5.5°C20 Aug 2000 | 141 mm19 Aug 2005 | 218 mm2005 · driest 13 mm in 2002 | 27 |
| September | 35.0°C10 Sep 2013 | -0.5°C29 Sep 2000 | 68 mm7 Sep 1996 | 181 mm1996 · driest 25 mm in 2004 | 27 |
| October | 31.5°C8 Oct 2007 | -7.5°C31 Oct 2020 | 61 mm5 Oct 1995 | 136 mm1995 · driest 20 mm in 2000 | 27 |
| November | 24.5°C10 Nov 2020 | -16.5°C13 Nov 2019 | 58 mm2 Nov 1999 | 144 mm2003 · driest 11 mm in 2012 | 28 |
| December | 18.0°C5 Dec 2001 | -26.0°C20 Dec 2004 | 38 mm6 Dec 1998 | 116 mm2008 · driest 32 mm in 1999 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 12 |
| February | 0 | 0 | 27 | 2 | 10 |
| March | <1 | 0 | 25 | 2 | 6 |
| April | <1 | 0 | 12 | 3 | 3 |
| May | 6 | 1 | 1 | 3 | 0 |
| June | 15 | 5 | 0 | 3 | 0 |
| July | 24 | 9 | 0 | 3 | 0 |
| August | 22 | 5 | 0 | 3 | 0 |
| September | 10 | 2 | <1 | 3 | 0 |
| October | 1 | <1 | 4 | 2 | <1 |
| November | 0 | 0 | 16 | 2 | 4 |
| December | 0 | 0 | 26 | 2 | 9 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 33% | 6% | 46% | -4.0–1.8°C |
| February | 0% | 29% | 5% | 37% | -3.5–2.7°C |
| March | 2% | 27% | 6% | 35% | 2.8–9.3°C |
| April | 8% | 34% | 10% | 47% | 10.3–14.8°C |
| May | 36% | 29% | 8% | 36% | 17.4–22.9°C |
| June | 59% | 32% | 11% | 42% | 23.4–26.6°C |
| July | 71% | 28% | 8% | 34% | 25.4–30.0°C |
| August | 74% | 25% | 8% | 25% | 25.1–28.0°C |
| September | 55% | 26% | 9% | 30% | 20.8–24.9°C |
| October | 13% | 31% | 7% | 37% | 13.2–16.1°C |
| November | <1% | 31% | 7% | 40% | 4.4–11.1°C |
| December | 0% | 32% | 7% | 39% | -1.1–4.8°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 6165683
- NOAA station
- CA00615S001 · TORONTO NORTH YORK
- Station distance
- 4.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 43.81°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 22 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Thornhill is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work