Measurements:
°C
°F
CURRENT WEATHER
11:11
Saint John
50°F
N 6 mph
Feels like: 46°F
Precip: 0%
World Resorts Canada Saint John Weather

7 Day Weather Forecast

05.19
tue
DAY
50°F
N 6 mph
precip
0%
NIGHT
52°F
NE 5 mph
precip
100%
05.20
wed
DAY
70°F
NE 10 mph
precip
100%
NIGHT
58°F
SE 13 mph
precip
0%
05.21
thu
DAY
52°F
SE 14 mph
precip
0%
NIGHT
40°F
SE 5 mph
precip
0%
05.22
fri
DAY
56°F
SE 12 mph
precip
0%
NIGHT
46°F
SE 5 mph
precip
0%
05.23
sat
DAY
56°F
S 10 mph
precip
0%
NIGHT
40°F
NW 3 mph
precip
0%
05.24
sun
DAY
60°F
N 5 mph
precip
0%
NIGHT
44°F
NE 4 mph
precip
0%
05.25
mon
DAY
58°F
NE 9 mph
precip
0%
NIGHT
44°F
NE 7 mph
precip
0%

Saint John Sea Water Temperature in May, °F

Select Year: 2026 2025 2024

The average sea surface temperature in May 2026 for Saint John was 6.0°F. The maximum and minimum values were 4.2°F and 7.6°F respectively.

Saint John on the Weather Map

Best Time to Visit Saint John
The most sunny months:
September 10 days
October 10 days
August 9 days
The most warm months:
July 75.1 °F
August 74.3 °F
June 70.1 °F
Warmest sea temperature:
August 60.6 °F
September 59.3 °F
July 57.7 °F
The most cold months:
January 22.9 °F
February 23.7 °F
December 30.5 °F
The most rainy months:
July 3 days
October 3 days
November 2 days
The most windy months:
March 9 mph
December 9 mph
February 8 mph
more details