Saint John (NB) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saint John.
Climate overview of Saint John
Saint John, New Brunswick, Canada, experiences significant temperature variation throughout the year. Summers bring daytime highs of 21°C (70°F) in August, while winters cool to -1°C (30°F) in January.
Rain/snowfall is high, totalling around 1384 mm (54 in) per year. December is the wettest month and August the driest.
Saint John Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint John — and find the best time to visit.
Monthly Temperature in Saint John
Depending on the time of the year, temperatures range from pleasant to very cold in Saint John. Average maximum daytime temperatures range from a pleasant 21°C (70°F) in August, the warmest time of the year, to a very cold -1°C (30°F) during cooler months like January.
At night, you can expect temperatures ranging from 14°C (57°F) in August to around -10°C (14°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Saint John
Saint John has a relatively rain/snowy climate with high precipitation levels, averaging 1384 mm (54 in) of rain/snowfall annually. Year-round, Saint John has a balanced climate with minimal variation in precipitation. The difference between the wettest month, December, with 140 mm (5.5 in), and the driest month, August, with 87 mm (3.4 in), is minimal. For more details, please visit our Saint John Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Saint John
Rainfall during this time ranges from 87 mm (3.4 in) in August to 115 mm (4.5 in) in September. This means you can expect a mix of sunny days and occasional showers. Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
Frequently asked questions about the climate in Saint John
What is the best time to visit Saint John?
July and August typically offer the most optimal weather in Saint John. In contrast, January, February, March, April, May, October, November and December tend to have less optimal conditions.
What temperatures can I expect in Saint John?
Daytime highs range from -1°C (30°F) in January to 21°C (70°F) in August. Nighttime lows range from -10°C (14°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Saint John get?
Annual rainfall is around 1384 mm (54 in). December is the wettest month with 140 mm (5.5 in), while August is the driest with 87 mm (3.4 in). In the coldest months, precipitation may fall as snow/rain.
Saint John 3-Day Forecast
Saint John (NB) 3-Day Forecast
Saint John on the map
Saint John is highlighted — select any city to see its climate.
Popular this month
Where to go in June — average daytime high across popular destinations.
Montréal
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25°C (77°F) Ottawa25°C (77°F) Quebec City
23°C (73°F) Toronto22°C (72°F) Calgary20°C (68°F) Vancouver19°C (66°F) Whistler15°C (59°F) 
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