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 (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	-2	-1	3	8	14	18	21	21	18	12	7	1
Min temperature (night-time)	-11	-11	-5	0	5	9	12	13	10	5	-1	-8
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0
Sea temperature	2	1	1	2	4	6	12	13	13	11	7	4

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 (mm)	126	104	95	100	108	96	100	97	104	106	133	145

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 -2°C 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 126 mm of rainfall in the month, which might fall as snow.

-2
-2°C max day temperature
4
4 hours of sunshine per day
13
13 days with some rainfall
-11
-11°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
126
126 mm of monthly rainfall
1
1 (Low) UV index
2
2°C sea temperature

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St John weather in February

Expect daytime maximum temperatures of -1°C 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 104 mm of rainfall in the month, which might fall as snow.

-1
-1°C max day temperature
4
4 hours of sunshine per day
11
11 days with some rainfall
-11
-11°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
104
104 mm of monthly rainfall
2
2 (Low) UV index
1
1°C sea temperature

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St John weather in March

Expect daytime maximum temperatures of 3°C 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 95 mm of rainfall in the month, which might fall as snow.

3
3°C max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
-5
-5°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
95
95 mm of monthly rainfall
3
3 (Moderate) UV index
1
1°C sea temperature

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St John weather in April

Expect daytime maximum temperatures of 8°C 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 100 mm of rainfall in the month.

8
8°C max day temperature
5
5 hours of sunshine per day
13
13 days with some rainfall
0
0°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
100
100 mm of monthly rainfall
5
5 (Moderate) UV index
2
2°C sea temperature

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St John weather in May

Expect daytime maximum temperatures of 14°C 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 108 mm of rainfall in the month.

14
14°C max day temperature
7
7 hours of sunshine per day
14
14 days with some rainfall
5
5°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
108
108 mm of monthly rainfall
6
6 (High) UV index
4
4°C sea temperature

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St John weather in June

Expect daytime maximum temperatures of 18°C 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 96 mm of rainfall in the month.

18
18°C max day temperature
7
7 hours of sunshine per day
13
13 days with some rainfall
9
9°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
96
96 mm of monthly rainfall
7
7 (High) UV index
6
6°C sea temperature

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St John weather in July

Expect daytime maximum temperatures of 21°C 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 100 mm of rainfall in the month.

21
21°C max day temperature
7
7 hours of sunshine per day
12
12 days with some rainfall
12
12°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
100
100 mm of monthly rainfall
7
7 (High) UV index
12
12°C sea temperature

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St John weather in August

Expect daytime maximum temperatures of 21°C 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 97 mm of rainfall in the month.

21
21°C max day temperature
7
7 hours of sunshine per day
12
12 days with some rainfall
13
13°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
97
97 mm of monthly rainfall
7
7 (High) UV index
13
13°C sea temperature

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St John weather in September

Expect daytime maximum temperatures of 18°C 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 104 mm of rainfall in the month.

18
18°C max day temperature
6
6 hours of sunshine per day
11
11 days with some rainfall
10
10°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
104
104 mm of monthly rainfall
5
5 (Moderate) UV index
13
13°C sea temperature

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St John weather in October

Expect daytime maximum temperatures of 12°C 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 106 mm of rainfall in the month.

12
12°C max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
5
5°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
106
106 mm of monthly rainfall
3
3 (Moderate) UV index
11
11°C sea temperature

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St John weather in November

Expect daytime maximum temperatures of 7°C 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 133 mm of rainfall in the month.

7
7°C max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
-1
-1°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
133
133 mm of monthly rainfall
1
1 (Low) UV index
7
7°C sea temperature

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St John weather in December

Expect daytime maximum temperatures of 1°C 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 145 mm of rainfall in the month, which might fall as snow.

1
1°C max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
-8
-8°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
145
145 mm of monthly rainfall
1
1 (Low) UV index
4
4°C sea temperature

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