Climate averages 1991–2020
St. Catharines weather
in June.
A warm, wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in St. Catharines: daytime highs average 22.8°C and nights cool to about 15.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 91 mm of rain on roughly 11 days, which makes June a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 19 min on an average June day.
The nearest other city in this atlas is Niagara Falls (16 km away). In June its highs average 23.4°C, 0.6°C warmer than St. Catharines, with 100 mm of rain.
Among the 86 cities listed in Canada, St. Catharines ranks joint 36th of 86 for the warmest June highs and joint 37th of 86 for the driest June (rainfall, lowest first). The mean June high of those 86 cities is 21.4°C; St. Catharines is 1.4°C warmer than that mean.
From June to July, average highs rise by 3.0°C to 25.8°C, and monthly rainfall falls from 91 mm to 88 mm.
The annual picture
June 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
St. Catharines climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.3°C-6.0°C | -6.0°C | 75 | 11.9 | 9.49 h |
| February | 0.0°C-6.6°C | -6.6°C | 60 | 9.1 | 10.510 h |
| March | 4.2°C-2.8°C | -2.8°C | 73 | 10.4 | 11.912 h |
| April | 10.8°C3.0°C | 3.0°C | 97 | 11.7 | 13.413 h |
| May | 17.4°C9.5°C | 9.5°C | 83 | 11.4 | 14.615 h |
| June, selected | 22.8°C15.9°C | 15.9°C | 91 | 11.1 | 15.315 h |
| July | 25.8°C19.4°C | 19.4°C | 88 | 10.8 | 15.015 h |
| August | 25.1°C19.1°C | 19.1°C | 75 | 9.9 | 14.014 h |
| September | 21.5°C15.5°C | 15.5°C | 85 | 9.7 | 12.513 h |
| October | 14.8°C9.4°C | 9.4°C | 92 | 12.0 | 11.111 h |
| November | 8.2°C3.3°C | 3.3°C | 82 | 10.7 | 9.810 h |
| December | 2.9°C-1.7°C | -1.7°C | 77 | 11.6 | 9.19 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
June in nearby cities
- Niagara Falls in JuneCanada · 16 kmHigh 23.4°C · Low 15.9°C · 100 mm rain
- Amherst in JuneUnited States · 42 kmHigh 23.6°C · Low 15.5°C · 95 mm rain
- Stoney Creek in JuneCanada · 43 kmHigh 24.3°C · Low 15.1°C · 86 mm rain
- Buffalo in JuneUnited States · 43 kmHigh 23.0°C · Low 16.0°C · 100 mm rain
- Oakville in JuneCanada · 47 kmHigh 22.4°C · Low 14.9°C · 82 mm rain
- Cheektowaga in JuneUnited States · 50 kmHigh 23.3°C · Low 15.4°C · 95 mm rain
- Hamilton in JuneCanada · 50 kmHigh 22.9°C · Low 15.9°C · 86 mm rain
- Burlington in JuneCanada · 54 kmHigh 22.9°C · Low 14.8°C · 82 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 St. Catharines) is explained once on the St. Catharines year overview and on the Sources, method and limits page.