Climate averages 1991–2020
St. Catharines weather
in July.
A warm, moderately wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in St. Catharines: daytime highs average 25.8°C and nights cool to about 19.4°C. By daytime temperature it is the warmest month of the year.
Expect about 88 mm of rain on roughly 11 days, which makes July a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 02 min on an average July day.
The nearest other city in this atlas is Niagara Falls (16 km away). In July its highs average 25.8°C, about as warm as St. Catharines, with 103 mm of rain.
Among the 86 cities listed in Canada, St. Catharines ranks joint 13th of 86 for the warmest July highs and joint 56th of 86 for the driest July (rainfall, lowest first). The mean July high of those 86 cities is 24.4°C; St. Catharines is 1.4°C warmer than that mean.
From July to August, average highs fall by 0.7°C to 25.1°C, and monthly rainfall falls from 88 mm to 75 mm.
The annual picture
July 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 | 22.8°C15.9°C | 15.9°C | 91 | 11.1 | 15.315 h |
| July, selected | 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
July in nearby cities
- Niagara Falls in JulyCanada · 16 kmHigh 25.8°C · Low 19.0°C · 103 mm rain
- Amherst in JulyUnited States · 42 kmHigh 25.9°C · Low 18.3°C · 99 mm rain
- Stoney Creek in JulyCanada · 43 kmHigh 26.8°C · Low 18.1°C · 77 mm rain
- Buffalo in JulyUnited States · 43 kmHigh 25.3°C · Low 18.8°C · 103 mm rain
- Oakville in JulyCanada · 47 kmHigh 25.7°C · Low 18.4°C · 74 mm rain
- Cheektowaga in JulyUnited States · 50 kmHigh 25.5°C · Low 18.1°C · 99 mm rain
- Hamilton in JulyCanada · 50 kmHigh 26.2°C · Low 19.1°C · 77 mm rain
- Burlington in JulyCanada · 54 kmHigh 25.9°C · Low 18.1°C · 74 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.