Hamilton, Ontario weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: June – September
What is the weather like in Hamilton, Ontario in August?
In August, Hamilton, Ontario is warm: daytime highs average 25 °C, and nights cool down to about 19 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 9 rainy days and 67 mm in total. All in all, August is an excellent month for a holiday in Hamilton, Ontario.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 86 | 84 | 80 |
| Day | 26° | 25° | 22° |
| Night | 20° | 19° | 16° |
| Sun | 9 h | 8 h | 6 h |
| Rain days | 10 | 9 | 9 |
More details for August
- Daylight
- 14 h 1 min06:24 – 20:25
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 12 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/Toronto
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %75 %
- Few rainy daysweight 30 %62 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Rain jacket or umbrella
Hamilton, Ontario in August: quick answers
Is Hamilton, Ontario hot in August?
Warm rather than hot: in August, daytime highs in Hamilton, Ontario average 25 °C and nights cool to about 19 °C.
Does it rain much in Hamilton, Ontario in August?
Rain is frequent, with about 9 rainy days and 67 mm in total.
Hamilton, Ontario month by month
The whole year in Hamilton, OntarioAll destinations: CanadaWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences