Weather in Saint John in September
How warm is it in Saint John in September?
In September the typical daytime high in Saint John is 20.0 °C on average, from 22.7 °C at the start to 17.1 °C at the end of the month.
That is 4.7 °C cooler than in August and 6.7 °C warmer than in October.
The last 10 years were 1.2 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Woodstock (153 km) and Charlottetown A (253 km); nearer ones count more.