Climate averages 1991–2020
Guelph weather
in May.
A mild, moderately wet month: the 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Guelph: daytime highs average 18.3°C and nights cool to about 7.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 88 mm of rain on roughly 12 days, which makes May a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 41 min on an average May day.
The nearest other city in this atlas is Cambridge, Canada (21 km away). In May its highs average 18.8°C, 0.5°C warmer than Guelph, with 87 mm of rain.
Among the 86 cities listed in Canada, Guelph ranks joint 22nd of 86 for the warmest May highs and joint 57th of 86 for the driest May (rainfall, lowest first). The mean May high of those 86 cities is 17.0°C; Guelph is 1.3°C warmer than that mean.
From May to June, average highs rise by 4.9°C to 23.2°C, and monthly rainfall rises from 88 mm to 93 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
Guelph climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.4°C-10.5°C | -10.5°C | 65 | 10.8 | 9.39 h |
| February | -1.4°C-10.8°C | -10.8°C | 54 | 8.4 | 10.510 h |
| March | 4.0°C-5.7°C | -5.7°C | 62 | 9.7 | 11.912 h |
| April | 11.1°C0.9°C | 0.9°C | 87 | 11.7 | 13.413 h |
| May, selected | 18.3°C7.8°C | 7.8°C | 88 | 11.6 | 14.715 h |
| June | 23.2°C13.5°C | 13.5°C | 93 | 11.5 | 15.415 h |
| July | 25.4°C16.1°C | 16.1°C | 85 | 10.9 | 15.115 h |
| August | 24.4°C15.5°C | 15.5°C | 76 | 9.9 | 14.014 h |
| September | 20.6°C11.8°C | 11.8°C | 77 | 9.5 | 12.613 h |
| October | 13.4°C5.7°C | 5.7°C | 78 | 11.0 | 11.111 h |
| November | 6.3°C-0.5°C | -0.5°C | 73 | 10.6 | 9.710 h |
| December | 0.6°C-5.9°C | -5.9°C | 63 | 10.7 | 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
- Cambridge, Canada in MayCanada · 21 kmHigh 18.8°C · Low 8.3°C · 87 mm rain
- Waterloo in MayCanada · 23 kmHigh 18.3°C · Low 7.8°C · 88 mm rain
- Kitchener in MayCanada · 25 kmHigh 18.3°C · Low 7.5°C · 88 mm rain
- Milton in MayCanada · 30 kmHigh 18.5°C · Low 8.8°C · 83 mm rain
- Burlington in MayCanada · 38 kmHigh 17.4°C · Low 8.8°C · 81 mm rain
- Caledon in MayCanada · 41 kmHigh 17.4°C · Low 7.0°C · 83 mm rain
- Brampton in MayCanada · 42 kmHigh 18.5°C · Low 8.0°C · 79 mm rain
- Brantford in MayCanada · 46 kmHigh 19.1°C · Low 8.8°C · 87 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 Guelph) is explained once on the Guelph year overview and on the Sources, method and limits page.