Annual mean 7°C · wettest around December · prevailing wind W
Warmest
22.0 °C
Coldest
-3.9 °C
Wettest
27%
Windiest
5.6 m/s
Prevailing
W
4.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Saint John over the whole year is 7°C. August is the hottest month, with highs of about 21°C; February is the coldest, with lows of about -7°C. Saint John has no sharply defined rainy season: the chance of rain on a given day runs from 12% in August, the driest month, to 22% in December, the wettest. Winds in Saint John are highest in March, averaging 4.4 m/s (16 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the W. The clearest skies in Saint John come in August, when the sky is typically 53% covered; January is the cloudiest month, at 63%.
Month by month Saint John climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-4°C
-7°C
-10°C
21%
63%
4.1 m/s
0
0
0
February
-3°C
-7°C
-9°C
19%
57%
4.2 m/s
0
0
1
March
1°C
-3°C
-5°C
20%
59%
4.4 m/s
0
0
2
April
7°C
2°C
2°C
21%
59%
4.1 m/s
2
0
21
May
13°C
6°C
9°C
17%
60%
3.7 m/s
17
1
61
June
18°C
12°C
16°C
18%
58%
3.3 m/s
52
6
77
July
21°C
15°C
21°C
12%
60%
2.9 m/s
78
24
64
August
21°C
14°C
21°C
12%
53%
2.8 m/s
84
19
67
September
18°C
11°C
16°C
13%
54%
3.1 m/s
60
5
80
October
13°C
7°C
9°C
15%
57%
3.4 m/s
18
0
64
November
5°C
2°C
-0°C
20%
61%
4.2 m/s
2
0
16
December
-1°C
-4°C
-7°C
22%
61%
4.2 m/s
0
0
2
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Saint John weather by season
Year round, Saint John has days of about -4°C at their warmest in January, its coolest month, and 21°C in August, its warmest; the coolest hours of the day run from -7°C to 15°C through the year, and the average temperature over the year is 7°C around the clock. Rain is most likely around December and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Saint John weather in winterDecember to February
High -2°CLow -6°CRain 20%
Winter in Saint John has typical daily highs of about -2°C and lows of about -6°C, with a 20% chance of rain on a given day.
Saint John weather in springMarch to May
High 7°CLow 2°CRain 20%
Spring in Saint John has typical daily highs of about 7°C and lows of about 2°C, with a 20% chance of rain on a given day.
Saint John weather in summerJune to August
High 20°CLow 13°CRain 14%
Summer in Saint John has typical daily highs of about 20°C and lows of about 13°C, with a 14% chance of rain on a given day.
Saint John weather in autumnSeptember to November
High 12°CLow 7°CRain 16%
Autumn in Saint John has typical daily highs of about 12°C and lows of about 7°C, with a 16% chance of rain on a given day.
When is the rainy season in Saint John?
Saint John has no sharply defined rainy season: the chance of rain on a given day runs from 12% in August, the driest month, to 22% in December, the wettest.
What time of year is Saint John windiest?
Winds in Saint John are highest in March, averaging 4.4 m/s (16 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the W.
What is the average temperature in Saint John year round?
The average temperature in Saint John over the whole year is 7°C. August is the hottest month, with highs of about 21°C; February is the coldest, with lows of about -7°C.