St John weather by month

Check out St John weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & UV index

Temperature in St John (°F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	28	30	37	46	57	64	70	70	64	54	45	34
Min temperature (night-time)	12	12	23	32	41	48	54	55	50	41	30	18
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0
Sea temperature	36	34	34	36	39	43	54	55	55	52	45	39

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in St John

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	4	4	5	5	7	7	7	7	6	5	3	3
Daily hours of daylight	9	10	12	14	15	16	15	14	12	11	10	9
UV Index (Maximum)	1	2	3	5	6	7	7	7	5	3	1	1

Rainfall in St John

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	13	11	12	13	14	13	12	12	11	12	14	14
Average monthly rainfall (inches)	5.0	4.1	3.7	3.9	4.3	3.8	3.9	3.8	4.1	4.2	5.2	5.7

More about St John

St John by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for New Brunswick (St John) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in St John?

St John has a cold climate with warm summers and some rainfall in all months.

St John weather in January

Expect daytime maximum temperatures of 28°F in St John, New Brunswick in January based on long-term weather averages. There are 4 hours of sunshine per day on average with 13 days with some rainfall and typically 5.0 inches of rainfall in the month, which might fall as snow.

28
28°F max day temperature
4
4 hours of sunshine per day
13
13 days with some rainfall
12
12°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
5.0
5.0 inches of monthly rainfall
1
1 (Low) UV index
36
36°F sea temperature

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St John weather in February

Expect daytime maximum temperatures of 30°F in St John, New Brunswick in February based on long-term weather averages. There are 4 hours of sunshine per day on average with 11 days with some rainfall and typically 4.1 inches of rainfall in the month, which might fall as snow.

30
30°F max day temperature
4
4 hours of sunshine per day
11
11 days with some rainfall
12
12°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
4.1
4.1 inches of monthly rainfall
2
2 (Low) UV index
34
34°F sea temperature

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St John weather in March

Expect daytime maximum temperatures of 37°F in St John, New Brunswick in March based on long-term weather averages. There are 5 hours of sunshine per day on average with 12 days with some rainfall and typically 3.7 inches of rainfall in the month, which might fall as snow.

37
37°F max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
23
23°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
3.7
3.7 inches of monthly rainfall
3
3 (Moderate) UV index
34
34°F sea temperature

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St John weather in April

Expect daytime maximum temperatures of 46°F in St John, New Brunswick in April based on long-term weather averages. There are 5 hours of sunshine per day on average with 13 days with some rainfall and typically 3.9 inches of rainfall in the month.

46
46°F max day temperature
5
5 hours of sunshine per day
13
13 days with some rainfall
32
32°F min night temperature
14
14 hours of daylight per day
0
No heat & humidity
3.9
3.9 inches of monthly rainfall
5
5 (Moderate) UV index
36
36°F sea temperature

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St John weather in May

Expect daytime maximum temperatures of 57°F in St John, New Brunswick in May based on long-term weather averages. There are 7 hours of sunshine per day on average with 14 days with some rainfall and typically 4.3 inches of rainfall in the month.

57
57°F max day temperature
7
7 hours of sunshine per day
14
14 days with some rainfall
41
41°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
4.3
4.3 inches of monthly rainfall
6
6 (High) UV index
39
39°F sea temperature

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St John weather in June

Expect daytime maximum temperatures of 64°F in St John, New Brunswick in June based on long-term weather averages. There are 7 hours of sunshine per day on average with 13 days with some rainfall and typically 3.8 inches of rainfall in the month.

64
64°F max day temperature
7
7 hours of sunshine per day
13
13 days with some rainfall
48
48°F min night temperature
16
16 hours of daylight per day
0
No heat & humidity
3.8
3.8 inches of monthly rainfall
7
7 (High) UV index
43
43°F sea temperature

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St John weather in July

Expect daytime maximum temperatures of 70°F in St John, New Brunswick in July based on long-term weather averages. There are 7 hours of sunshine per day on average with 12 days with some rainfall and typically 3.9 inches of rainfall in the month.

70
70°F max day temperature
7
7 hours of sunshine per day
12
12 days with some rainfall
54
54°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.9
3.9 inches of monthly rainfall
7
7 (High) UV index
54
54°F sea temperature

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St John weather in August

Expect daytime maximum temperatures of 70°F in St John, New Brunswick in August based on long-term weather averages. There are 7 hours of sunshine per day on average with 12 days with some rainfall and typically 3.8 inches of rainfall in the month.

70
70°F max day temperature
7
7 hours of sunshine per day
12
12 days with some rainfall
55
55°F min night temperature
14
14 hours of daylight per day
0
No heat & humidity
3.8
3.8 inches of monthly rainfall
7
7 (High) UV index
55
55°F sea temperature

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St John weather in September

Expect daytime maximum temperatures of 64°F in St John, New Brunswick in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 11 days with some rainfall and typically 4.1 inches of rainfall in the month.

64
64°F max day temperature
6
6 hours of sunshine per day
11
11 days with some rainfall
50
50°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
4.1
4.1 inches of monthly rainfall
5
5 (Moderate) UV index
55
55°F sea temperature

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St John weather in October

Expect daytime maximum temperatures of 54°F in St John, New Brunswick in October based on long-term weather averages. There are 5 hours of sunshine per day on average with 12 days with some rainfall and typically 4.2 inches of rainfall in the month.

54
54°F max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
41
41°F min night temperature
11
11 hours of daylight per day
0
No heat & humidity
4.2
4.2 inches of monthly rainfall
3
3 (Moderate) UV index
52
52°F sea temperature

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St John weather in November

Expect daytime maximum temperatures of 45°F in St John, New Brunswick in November based on long-term weather averages. There are 3 hours of sunshine per day on average with 14 days with some rainfall and typically 5.2 inches of rainfall in the month.

45
45°F max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
30
30°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
5.2
5.2 inches of monthly rainfall
1
1 (Low) UV index
45
45°F sea temperature

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St John weather in December

Expect daytime maximum temperatures of 34°F in St John, New Brunswick in December based on long-term weather averages. There are 3 hours of sunshine per day on average with 14 days with some rainfall and typically 5.7 inches of rainfall in the month, which might fall as snow.

34
34°F max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
18
18°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
5.7
5.7 inches of monthly rainfall
1
1 (Low) UV index
39
39°F sea temperature

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