Saint John Weather in October
What's the weather like in Saint John (New Brunswick) in October 2025?
The climate in Saint John during October can be summarized as cool and damp.
October is in the fall / autumn in Saint John and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 12°C (54°F), whilst at night 5°C (40°F) is normal.
| Daytime temperature | 12.3°C 54.1°F |
|---|---|
| Nightly temperature | 4.6°C 40.2°F |
| Average temperature | 8.4°C 47.1°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 106 mm 4.2 ins |
| Rainy days | 12 days |
| Sea temperature | 11.5°C 52.8°F |
| Humidity | 79% |
| Windspeed | 14.8kph 9 mph |
On average October is the 5th wettest month of the year in Saint John with around 106mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
October temperatures in Saint John
October rainfall
October hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Saint John in October 2025.
Other monthly averages
Best places to visit in October
Saint John weather stats
| Hottest month: | August | 21.1°C 70°F |
|---|---|---|
| Driest month: | March | 95mm 3.7ins |
| Sunniest month: | August | 7.5hrs |
| Coldest month: | January | -2.3°C 27.9°F |
| Wettest month: | December | 145mm 5.7ins |
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