Saint John Climate by Month
Saint John, New Brunswick, Canada
Mild summers and freezing winters, with rain spread through the year.
Mild summers and freezing winters, with rain spread through the year: that's Saint John's climate in short. Expect highs of 74°F (24°C) in August and 27°F (-3°C) in January, with the coldest nights (January) near 10°F (-12°C). About 50 in (1275 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 82% relative humidity.
- Warmest month
- 74°F(24°C)
- Average high, August
- Coldest nights
- 10°F(-12°C)
- Average low, January
- Rain per year
- 50 in(1275 mm)
- No clear rainy season
- Humidity
- 82%
- Sunniest: July
Best and worst months in Saint John
Best for weatherJuly and August are the best time for weather in Saint John: highs near 74°F (23°C) and about 2.8 in (72 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 27°F (-3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in August.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Saint John weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 27°F(-3°C) | 10°F(-12°C) | 4.6 in(117 mm) | 86% | 1.5 |
| FebFebruary | 30°F(-1°C) | 12°F(-11°C) | 3.5 in(88 mm) | 100% | 2.4 |
| MarMarch | 37°F(3°C) | 21°F(-6°C) | 4.4 in(113 mm) | 73% | 3.4 |
| AprApril | 49°F(9°C) | 33°F(0°C) | 4.0 in(101 mm) | 70% | 4.3 |
| MayMay | 60°F(16°C) | 42°F(5°C) | 4.3 in(110 mm) | 71% | 5.0 |
| JunJune | 68°F(20°C) | 50°F(10°C) | 4.0 in(101 mm) | 76% | 5.5 |
| JulJulyBest | 74°F(23°C) | 56°F(13°C) | 3.1 in(80 mm) | 76% | 5.5 |
| AugAugustBest | 74°F(24°C) | 56°F(14°C) | 2.5 in(64 mm) | 75% | 5.0 |
| SepSeptember | 67°F(20°C) | 50°F(10°C) | 4.1 in(104 mm) | 83% | 3.8 |
| OctOctober | 56°F(14°C) | 41°F(5°C) | 5.3 in(134 mm) | 86% | 2.4 |
| NovNovember | 45°F(7°C) | 31°F(0°C) | 5.1 in(130 mm) | 90% | 1.4 |
| DecDecember | 35°F(1°C) | 20°F(-7°C) | 5.2 in(133 mm) | 100% | 1.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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