Climate averages 1991–2020
Hamilton weather
in May.
A mild, moderately wet month: the 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Hamilton: daytime highs average 17.0°C and nights cool to about 9.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 83 mm of rain on roughly 11 days, which makes May a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 39 min on an average May day.
The nearest other city in this atlas is Stoney Creek (8 km away). In May its highs average 19.1°C, 2.2°C warmer than Hamilton, with 83 mm of rain.
Among the 86 cities listed in Canada, Hamilton ranks joint 48th of 86 for the warmest May highs and joint 38th of 86 for the driest May (rainfall, lowest first). The mean May high of those 86 cities is 17.0°C; Hamilton is level with that mean.
From May to June, average highs rise by 6.0°C to 22.9°C, and monthly rainfall rises from 83 mm to 86 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Stoney Creek in MayCanada · 8 kmHigh 19.1°C · Low 9.0°C · 83 mm rain
- Burlington in MayCanada · 15 kmHigh 17.4°C · Low 8.8°C · 81 mm rain
- Oakville in MayCanada · 26 kmHigh 16.8°C · Low 8.8°C · 81 mm rain
- Milton in MayCanada · 30 kmHigh 18.5°C · Low 8.8°C · 83 mm rain
- Brantford in MayCanada · 36 kmHigh 19.1°C · Low 8.8°C · 87 mm rain
- Cambridge, Canada in MayCanada · 39 kmHigh 18.8°C · Low 8.3°C · 87 mm rain
- Mississauga in MayCanada · 40 kmHigh 17.7°C · Low 8.1°C · 81 mm rain
- Guelph in MayCanada · 46 kmHigh 18.3°C · Low 7.8°C · 88 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.