Climate averages 1991–2020
Hamilton weather
in August.
A warm, moderately wet month: the 2nd warmest and the joint 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Hamilton: daytime highs average 25.4°C and nights cool to about 18.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 69 mm of rain on roughly 9 days, which makes August a moderately wet month (the joint 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 57 min on an average August day.
The nearest other city in this atlas is Stoney Creek (8 km away). In August its highs average 25.8°C, about as warm as Hamilton, with 69 mm of rain.
Among the 86 cities listed in Canada, Hamilton ranks 4th of 86 for the warmest August highs and joint 30th of 86 for the driest August (rainfall, lowest first). The mean August high of those 86 cities is 23.8°C; Hamilton is 1.6°C warmer than that mean.
From August to September, average highs fall by 3.8°C to 21.6°C, and monthly rainfall rises from 69 mm to 77 mm.
The annual picture
August 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
Hamilton climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.6°C-7.0°C | -7.0°C | 71 | 11.3 | 9.49 h |
| February | -0.3°C-7.5°C | -7.5°C | 57 | 8.6 | 10.510 h |
| March | 3.8°C-3.4°C | -3.4°C | 69 | 9.9 | 11.912 h |
| April | 9.8°C2.7°C | 2.7°C | 94 | 11.4 | 13.413 h |
| May | 17.0°C9.6°C | 9.6°C | 83 | 11.2 | 14.715 h |
| June | 22.9°C15.9°C | 15.9°C | 86 | 11.5 | 15.315 h |
| July | 26.2°C19.1°C | 19.1°C | 77 | 10.0 | 15.015 h |
| August, selected | 25.4°C18.7°C | 18.7°C | 69 | 9.4 | 14.014 h |
| September | 21.6°C15.1°C | 15.1°C | 77 | 9.3 | 12.513 h |
| October | 14.6°C8.9°C | 8.9°C | 85 | 11.0 | 11.111 h |
| November | 7.7°C2.7°C | 2.7°C | 79 | 10.3 | 9.810 h |
| December | 2.5°C-2.5°C | -2.5°C | 71 | 10.6 | 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
August in nearby cities
- Stoney Creek in AugustCanada · 8 kmHigh 25.8°C · Low 17.6°C · 69 mm rain
- Burlington in AugustCanada · 15 kmHigh 25.1°C · Low 17.7°C · 66 mm rain
- Oakville in AugustCanada · 26 kmHigh 25.1°C · Low 18.2°C · 66 mm rain
- Milton in AugustCanada · 30 kmHigh 25.2°C · Low 17.0°C · 72 mm rain
- Brantford in AugustCanada · 36 kmHigh 25.3°C · Low 16.5°C · 75 mm rain
- Cambridge, Canada in AugustCanada · 39 kmHigh 24.9°C · Low 16.0°C · 75 mm rain
- Mississauga in AugustCanada · 40 kmHigh 25.1°C · Low 17.0°C · 66 mm rain
- Guelph in AugustCanada · 46 kmHigh 24.4°C · Low 15.5°C · 76 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 Hamilton) is explained once on the Hamilton year overview and on the Sources, method and limits page.
Stoney Creek lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.