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Saint John climate
Typical historical weather for Saint John, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Want today's actual conditions instead? See the current forecast for Saint John.
Annual average
13.8°C
across all months
Warmest month
33.1°C
Jul average high
Coolest month
-5.2°C
Jan average low
Annual rainfall
724mm
total per year
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
● Avg high● Avg low▮ Rainfall
Records on file
Hottest day
40.9°C
19 August 2023
Coldest day
-23.4°C
15 February 2021
Wettest day
79.7mm
25 May 2025
Windiest day
11.2m/s
14 April 2018
See the detail: Saint John on 25 May 2025.