Climate averages 1991–2020
Markham weather
in May.
A mild, moderately wet month: the 5th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Markham: daytime highs average 17.5°C and nights cool to about 8.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 78 mm of rain on roughly 10 days, which makes May a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 43 min on an average May day.
The nearest other city in this atlas is Pickering (11 km away). In May its highs average 16.1°C, 1.4°C cooler than Markham, with 82 mm of rain.
Among the 86 cities listed in Canada, Markham ranks joint 34th of 86 for the warmest May highs and joint 25th of 86 for the driest May (rainfall, lowest first). The mean May high of those 86 cities is 17.0°C; Markham is 0.5°C warmer than that mean.
From May to June, average highs rise by 5.3°C to 22.8°C, and monthly rainfall falls from 78 mm to 77 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
Markham climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.7°C-9.5°C | -9.5°C | 81 | 11.8 | 9.39 h |
| February | -0.9°C-9.7°C | -9.7°C | 59 | 8.7 | 10.410 h |
| March | 3.9°C-4.8°C | -4.8°C | 68 | 9.9 | 11.912 h |
| April | 10.7°C1.7°C | 1.7°C | 92 | 11.0 | 13.413 h |
| May, selected | 17.5°C8.2°C | 8.2°C | 78 | 10.4 | 14.715 h |
| June | 22.8°C14.1°C | 14.1°C | 77 | 10.2 | 15.415 h |
| July | 25.7°C17.2°C | 17.2°C | 68 | 9.6 | 15.115 h |
| August | 24.9°C16.9°C | 16.9°C | 67 | 8.9 | 14.014 h |
| September | 21.1°C13.3°C | 13.3°C | 81 | 9.0 | 12.613 h |
| October | 14.0°C7.1°C | 7.1°C | 91 | 11.9 | 11.011 h |
| November | 7.0°C0.9°C | 0.9°C | 88 | 11.2 | 9.710 h |
| December | 1.5°C-4.8°C | -4.8°C | 81 | 12.1 | 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
- Pickering in MayCanada · 11 kmHigh 16.1°C · Low 8.1°C · 82 mm rain
- Richmond Hill in MayCanada · 14 kmHigh 17.8°C · Low 7.9°C · 72 mm rain
- Thornhill in MayCanada · 14 kmHigh 16.9°C · Low 8.2°C · 72 mm rain
- Ajax in MayCanada · 19 kmHigh 16.5°C · Low 8.8°C · 78 mm rain
- Vaughan in MayCanada · 19 kmHigh 17.5°C · Low 7.8°C · 72 mm rain
- Toronto in MayCanada · 21 kmHigh 15.8°C · Low 8.0°C · 72 mm rain
- Newmarket in MayCanada · 26 kmHigh 18.4°C · Low 7.9°C · 80 mm rain
- Whitby in MayCanada · 27 kmHigh 16.4°C · Low 8.8°C · 80 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 Markham) is explained once on the Markham year overview and on the Sources, method and limits page.