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Contents
- The climate of Saint John
- The best time to visit Saint John
- The worst time to visit Saint John
- Spring weather in Saint John
- Summer weather in Saint John
- Autumn weather in Saint John
- Winter weather in Saint John
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Saint John
Identified by the Köppen climate classification as Dfb, Saint John, Canada, experiences a humid continental climate with no dry season and warm summers. The geographical position leads to notable seasonal transitions in weather patterns. Balmy summers usher in mild autumns while moderate springs precede icy winters. The weather all year round is subject to change driven by a variety of local and global climatic factors.
On average, the temperature varies significantly from -8.6°C (16.5°F) in the coldest month to 21.5°C (70.7°F) in the hottest month. Monthly average temperatures in Saint John float from a chilly -1.9°C (28.6°F) to a warm 21.5°C (70.7°F). Observations show a relative humidity from 80% to 85%; a testament to the predominantly humid conditions. Rainfall presentation exhibits a pattern of steadiness ranging from 22mm (0.87") to 43mm (1.69") per month. Instances of snowfall are prevalently seen from November until March with an absolute absence in the summer months.
This climate endorses the formation of clouds with a minimum of 36% cloud coverage to a maximum of 63%. Moreover, wind speeds in this domain fluctuate between 12.3km/h (7.6mph) to 19.9km/h (12.4mph). Such conditions are unique to Saint John which experiences certain months with maximum rainfall and others with zero snowfall, providing a diverse weather palate throughout the year.
On average, the temperature varies significantly from -8.6°C (16.5°F) in the coldest month to 21.5°C (70.7°F) in the hottest month. Monthly average temperatures in Saint John float from a chilly -1.9°C (28.6°F) to a warm 21.5°C (70.7°F). Observations show a relative humidity from 80% to 85%; a testament to the predominantly humid conditions. Rainfall presentation exhibits a pattern of steadiness ranging from 22mm (0.87") to 43mm (1.69") per month. Instances of snowfall are prevalently seen from November until March with an absolute absence in the summer months.
This climate endorses the formation of clouds with a minimum of 36% cloud coverage to a maximum of 63%. Moreover, wind speeds in this domain fluctuate between 12.3km/h (7.6mph) to 19.9km/h (12.4mph). Such conditions are unique to Saint John which experiences certain months with maximum rainfall and others with zero snowfall, providing a diverse weather palate throughout the year.
The best time to visit Saint John
The most amicable time for tourists to visit Saint John is during the months of June, July, and August. The maximum temperature during these months hovers around a comfortable 16.8°C (62.2°F) to 21.5°C (70.7°F). Coupled with a relatively lower humidity of approximately 82%, it makes for striking weather, ideal for outdoor activities. The daylight duration ranges from a decent 14 hours to a maximum of 15.6 hours, facilitating ample time to explore the city's attractions.
The worst time to visit Saint John
While Saint John bears unique beauty in every season, the months of December, January, and February bear the harshest weather. With temperatures dipping as low as -8.6°C (16.5°F), these months embrace the most severe winter conditions. Prolonged snowfall during these months, reaching up to 40mm (1.57") in December, might impede outdoor activities for tourists.
Spring weather in Saint John
In Saint John, spring encompasses the months of March, April, and May. Temperature ranges from -1.5°C (29.3°F) to 12.8°C (55°F), marking a transition from winter cold to summer warmth. The region registers an increasing trend in rainfall from 26mm (1.02") in March to 35mm (1.38") in May, signaling the arrival of the rainier months. Subtle breezes with speeds hovering from 16.8km/h (10.4mph) to 14.4km/h (8.9mph) add to Saint John's spring charm.
Summer weather in Saint John
Summer lasts from June through August in Saint John. During this period, maximum temperatures sit between 16.8°C (62.2°F) and 21.5°C (70.7°F), providing pleasant warmth to the coming visitors. Relative humidity remains at a tolerable 82% to 83%, and there is a scant likelihood of snowfall. With daylight extending up to 15.6 hours a day, visitors will find enough time to enjoy the city's myriad attractions.
Autumn weather in Saint John
Autumn hits Saint John in the months of September, October, and November. The city receives an average rainfall of 35mm (1.38") to 40mm (1.57") during these months. Temperatures this season slide from warm 18°C (64.4°F) to colder 6.8°C (44.2°F) gradually. This underlines the transition from sunny summers to frigid winters. Wind speed also discernibly increases during these months ranging from 14.3km/h (8.9mph) to 18.5km/h (11.5mph).
Winter weather in Saint John
Winter in Saint John spans December, January, and February. The average temperatures during these months drop to -1.9°C (28.6°F) to 1.3°C (34.3°F), indicating chilling winters. Concurrently, snowfall replaces rainfall, adding to the icy conditions. The city experiences a significant amount of snowfall going up to 40mm (1.57") in December. With less sunshine and more snowfall, winters in Saint John are indeed a sight to behold.
Weather in January
Kicking off the year, January presents some of Saint John, Canada's coldest weather conditions. A dominating feature of this month is the high probability of snow, creating a winter wonderland ambiance across the city. Given freezing temperatures reaching their peak, it is a good idea to bundle up before venturing outdoors. Weather in January »
Weather in February
Transitioning to February, weather conditions in Saint John, Canada do not change significantly from January. It remains a snowy period with frosty temperatures persistent throughout the month. Just as in January, care should be taken to dress warmly before heading outside. Weather in February »
Weather in March
March, the first month of the spring in Saint John, is an icy month, with an average temperature varying between 1.6°C (34.9°F) and -4.3°C (24.3°F). The start of March brings a subtle rise in the average high-temperature, moving from a subzero cold -1.5°C (29.3°F) in February to an icy 1.6°C (34.9°F). Weather in March »
Weather in April
With the arrival of April, Saint John, Canada begins to experience discernible signs of spring. It marks a period where residents start enjoying more outdoor activities, taking advantage of the increasingly warmer days. Wind speeds tend to decrease, further enhancing the appeal of spending time outdoors. Weather in April »
Weather in May
May represents a significant shift in Saint John, Canada's weather conditions. The climate becomes more mild and favorable, setting the stage for many outdoor events across the city. Plants begin to bloom, restoring the city's parks and gardens to their lively state. Weather in May »
Weather in June
June in Saint John, Canada, calls for summertime preparation. The month delivers increasingly warm weather accompanied by longer hours of daylight. It signifies the commencement of summer festivals and events as the outdoor environment becomes more genial. Weather in June »
Weather in July
July is Saint John, Canada's quintessential summer month with suitably warm weather. It typifies the high summer season with a meteorological peak amid the prevailing conditions. Longer and warmer days imply more outdoor activities, picnics, and beach excursions for locals and tourists alike. Weather in July »
Weather in August
The month of August maintains the summer heat, albeit Saint John, Canada sees temperatures slightly starting to moderate. As the summer winds down, days gradually become shorter, yet the weather remains pleasant for outdoor enjoyment. Weather in August »
Weather in September
September in Saint John, Canada starts to indicate the shift from the summer season towards autumn. The temperature drops moderately but the weather is still generally pleasant. While daylight hours decrease, the month allows for abundant sunshine, appeasing those who enjoy the outdoors. Weather in September »
Weather in October
Weather in October is a meteorological signal of Autumn’s presence in Saint John, Canada. The city begins to paint itself with vibrant autumn colors, providing a picturesque view for locals and tourists. The weather becomes noticeably cooler, calling for an extra layer of clothing. Weather in October »
Weather in November
November in Saint John, Canada ushers in the beginning of the early winter season, with temperatures hitting notably lower levels. As the month progresses, the probability of snowfall increases, dusting the cityscape with the first signs of winter. Weather in November »
Weather in December
Finally, December in Saint John, Canada is synonymous with winter's arrival, plunging temperatures, and the holiday season. It's a festive time of the year with a fairytale-like panorama offered by the city's snow-clad streets. Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Saint John?
January, noted for its average high-temperature of -1.9°C (28.6°F) and an average low-temperature of -8.6°C (16.5°F), is considered the coldest month.
What is the most humid month in Saint John?
January and February, with an average relative humidity of 85%, are most humid months in Saint John, Canada.
How many days does it rain in Saint John?
In Saint John, during the entire year, the rain falls for 122.4 days and collects up to 390mm (15.35") of precipitation.
When does it snow in Saint John?
Months with snowfall are January through May, November and December.
When does it snow the most in Saint John?
January is the month with the most snowfall in Saint John. Snow falls for 7.6 days and accumulates 40mm (1.57") of snow.
How much does it snow in Saint John?
Throughout the year, in Saint John, there are 37.1 snowfall days, and 188mm (7.4") of snow is accumulated.
What is the month with the lowest UV index in Saint John?
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Saint John.
What is the month with the least sunshine in Saint John?
February has the least sunshine of the year, with an average of 3.7h of sunshine.
What is the month with the coldest sea water in Saint John?
The month with the coldest seawater is March, with an average sea temperature of 2.9°C (37.2°F).
When is Daylight Saving Time (DST) in Saint John?
On Sunday, 10. March 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from AST to ADT. Daylight Saving Time ends on Sunday, 03. November 2024, at 2:00 am, and the time zone reverts from ADT to AST.
When it does not snow in Saint John?
June through October are months without snowfall.
When are the longest days in Saint John?
With an average of 15h and 36min of daylight, June has the longest days of the year.
What are the months with the highest UV index in Saint John?
The months with the highest UV index in Saint John, Canada, are July and August, with an average maximum UV index of 5.
What is the warmest month in Saint John?
Temperature readings in Saint John, Canada, reach their annual highs in August, averaging 21.5°C (70.7°F) and a minimum average of 14.3°C (57.7°F).
What is the driest month in Saint John?
August is the month with the least rainfall in Saint John, Canada. Rain falls for 11.1 days and accumulates 22mm (0.87") of precipitation.
When is the sea warmest in Saint John?
With an average sea temperature of 13.3°C (55.9°F), August is the month with the warmest seawater in Saint John, Canada.
What month has the most sunshine in Saint John?
August has the most sunshine of the year in Saint John, Canada, with an average of 9.5h of sunshine.
What is the least humid month in Saint John?
October and November, with an average relative humidity of 80%, are the least humid months.
What is the wettest month in Saint John?
The month with the most rainfall is December, when the rain falls for 8.9 days and typically aggregates up to 43mm (1.69") of precipitation.
What is the month with the shortest days in Saint John?
The month with the shortest days in Saint John, Canada, is December, with an average of 8h and 48min of daylight.
Average temperature
Saint John, Canada
The warmest month (with the highest average high temperature) is August (21.5°C).
The month with the lowest average high temperature is January (-1.9°C).
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (-8.6°C).
Average pressure
Saint John, Canada
- Average pressure in January:
1013.3mbar - Average pressure in February:
1013.2mbar - Average pressure in March:
1015.3mbar - Average pressure in April:
1014mbar - Average pressure in May:
1015.6mbar - Average pressure in June:
1012.8mbar
- Average pressure in July:
1013.3mbar - Average pressure in August:
1014.3mbar - Average pressure in September:
1017mbar - Average pressure in October:
1015.4mbar - Average pressure in November:
1016.2mbar - Average pressure in December:
1014.9mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is June (1012.8mbar).
Average wind speed
Saint John, Canada
- Average wind speed in January:
19.9km/h - Average wind speed in February:
19.5km/h - Average wind speed in March:
19.2km/h - Average wind speed in April:
16.8km/h - Average wind speed in May:
14.4km/h - Average wind speed in June:
13.7km/h
- Average wind speed in July:
12.5km/h - Average wind speed in August:
12.3km/h - Average wind speed in September:
14.3km/h - Average wind speed in October:
17.2km/h - Average wind speed in November:
18.5km/h - Average wind speed in December:
19.3km/h
The windiest month (with the highest average wind speed) is January (19.9km/h).
The calmest month (with the lowest average wind speed) is August (12.3km/h).
Average humidity
Saint John, Canada
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are October and November (80%).
Average rainfall
Saint John, Canada
The wettest month (with the highest rainfall) is December (43mm).
The driest month (with the least rainfall) is August (22mm).
Average rainfall days
Saint John, Canada
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
5.4 days - Average rainfall days in March:
8.9 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
14.2 days - Average rainfall days in June:
13.6 days
- Average rainfall days in July:
12.4 days - Average rainfall days in August:
11.1 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
11 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
8.9 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is February (5.4 days).
Average snowfall
Saint John, Canada
The month with the highest snowfall is January (40mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days
Saint John, Canada
- Average snowfall days in January:
7.6 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
9.6 days - Average snowfall days in April:
3.4 days - Average snowfall days in May:
0.2 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
5.6 days
The month with the highest number of snowfall days is March (9.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature
Saint John, Canada
The best month for swimming (with the highest average sea temperature) is August (13.3°C).
The coldest month (with the lowest average sea temperature) is March (2.9°C).
Average daylight / Average sunshine
Saint John, Canada
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 1min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
3h and 4min - Average sunshine in March:
4h and 5min - Average sunshine in April:
6h and 4min - Average sunshine in May:
7h and 3min - Average sunshine in June:
8h and 2min
- Average sunshine in July:
9h and 1min - Average sunshine in August:
9h and 3min - Average sunshine in September:
8h and 1min - Average sunshine in October:
5h and 1min - Average sunshine in November:
4h and 2min - Average sunshine in December:
3h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days
Saint John, Canada
- Average sunshine days in January:
18.9 days - Average sunshine days in February:
16 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
13.8 days - Average sunshine days in June:
13.6 days
- Average sunshine days in July:
15.3 days - Average sunshine days in August:
16.9 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
18.4 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
16.9 days
The month with the most sunshine days is January (18.9 days).
The month with the least sunshine days is April (11.8 days).
Average UV index
Saint John, Canada
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover
Saint John, Canada
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility
Saint John, Canada
The month with the highest visibility is October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, November and December (9km).
Saint John, Canada
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