Temperature
Cold by day, freezing at night.
Brockville is usually most comfortable in May, June, August, and September. Typical daytime highs range from 28–79°F across the year. Rain varies by season.

Cold by day, freezing at night.
Some precipitation is expected this month.
A mix of sunshine and cloud.
Humidity is rarely noticeable in the cool air.
In November, afternoons feel about 35° and nights feel near 29°.
Mostly cloudy skies this month.
Calm winds are typical in November.
November late afternoons are around 42°F, easing to about 40°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 28 | 13 | 3.0 | 12 | 5.2 | 77 |
| Feb | 30 | 14 | 2.4 | 10 | 6.7 | 73 |
| Mar | 39 | 23 | 3.0 | 11 | 7.7 | 69 |
| Apr | 53 | 36 | 4.1 | 12 | 8.7 | 66 |
| May | 67 | 47 | 3.5 | 12 | 10.2 | 69 |
| Jun | 75 | 56 | 4.0 | 12 | 11.1 | 74 |
| Jul | 79 | 62 | 3.8 | 12 | 12.0 | 75 |
| Aug | 78 | 62 | 3.8 | 12 | 11.0 | 78 |
| Sep | 71 | 55 | 3.7 | 10 | 9.1 | 79 |
| Oct | 57 | 44 | 4.2 | 12 | 6.8 | 78 |
| Nov | 45 | 33 | 3.5 | 12 | 5.3 | 78 |
| Dec | 34 | 23 | 3.4 | 13 | 4.3 | 81 |
Similar climates
Want a side-by-side climate view? Compare Brockville with New York City.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 27, 2026
Data & methodology