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Monthly climate in Saint John, New Brunswick, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint John features a humid continental climate (Dfb).Temperatures typically range between -4 °C (26 °F) and 17 °C (63 °F) through the year, but rarely can drop to -22 °C (-8 °F) or can rise to as high as 23 °C (74 °F).The average annual precipitation amounts to about 1403 mm (55.2 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually.Saint John enjoys an average of 2787 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 34 minutes per day.

Monthly average temperatures in Saint John, New Brunswick, Canada §

The warmest months in Saint John are July, August and September, with daily mean temperatures ranging from 15 to 17 °C (59 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (26 - 31 °F) throughout the day. On average each year, Saint John experiences 0 days above 25 °C (77.0 °F) and 109 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint John, New Brunswick, Canada.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 13°C
(56°F)		 10°C
(50°F)		 11°C
(52°F)		 13°C
(55°F)		 20°C
(68°F)		 21°C
(71°F)		 22°C
(72°F)		 23°C
(74°F)		 22°C
(73°F)		 19°C
(67°F)		 16°C
(62°F)		 14°C
(57°F)
Mean maximum 9°C
(49°F)		 7°C
(45°F)		 8°C
(47°F)		 12°C
(53°F)		 17°C
(64°F)		 20°C
(67°F)		 21°C
(71°F)		 22°C
(73°F)		 20°C
(69°F)		 18°C
(64°F)		 15°C
(60°F)		 13°C
(55°F)
Average high 0°C
(32°F)		 0°C
(33°F)		 2°C
(36°F)		 7°C
(45°F)		 11°C
(53°F)		 15°C
(60°F)		 18°C
(65°F)		 20°C
(67°F)		 17°C
(63°F)		 13°C
(56°F)		 7°C
(45°F)		 2°C
(36°F)
Daily mean -4°C
(26°F)		 -3°C
(26°F)		 -1°C
(31°F)		 4°C
(40°F)		 9°C
(48°F)		 13°C
(56°F)		 16°C
(62°F)		 17°C
(63°F)		 15°C
(59°F)		 11°C
(52°F)		 5°C
(40°F)		 -1°C
(31°F)
Average low -7°C
(19°F)		 -7°C
(19°F)		 -4°C
(26°F)		 2°C
(36°F)		 6°C
(44°F)		 11°C
(51°F)		 14°C
(58°F)		 15°C
(60°F)		 13°C
(55°F)		 8°C
(48°F)		 2°C
(36°F)		 -4°C
(25°F)
Mean minimum -17°C
(1°F)		 -17°C
(1°F)		 -14°C
(7°F)		 -2°C
(28°F)		 2°C
(37°F)		 7°C
(44°F)		 12°C
(53°F)		 12°C
(54°F)		 9°C
(48°F)		 3°C
(38°F)		 -6°C
(21°F)		 -13°C
(9°F)
Minimum -22°C
(-8°F)		 -20°C
(-4°F)		 -17°C
(2°F)		 -5°C
(23°F)		 1°C
(33°F)		 4°C
(39°F)		 11°C
(51°F)		 11°C
(53°F)		 7°C
(45°F)		 0°C
(33°F)		 -12°C
(10°F)		 -18°C
(-1°F)

Compare climate in Saint John with other places

Compare temperature, precipitation, sunshine, UV index in Saint John, New Brunswick, Canada with other places around the world.

Monthly average precipitation in Saint John, New Brunswick, Canada §

Saint John usually has the most precipitation in April, November and December, with an average of 13 rainy days and 152 mm (6.0 inches) of precipitation per month.The driest months in Saint John are March, July and August. On average, 90 mm (3.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint John, New Brunswick, Canada.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 107 (4.2) 112 (4.4) 88 (3.5) 129 (5.1) 117 (4.6) 110 (4.3) 92 (3.6) 89 (3.5) 108 (4.3) 123 (4.8) 184 (7.3) 142 (5.6)
Average precipitation days (≥ 1 mm) 10 12 10 13 12 11 13 10 10 12 14 12

Monthly sunshine hours in Saint John, New Brunswick, Canada §

The sunniest months in Saint John are June, July and August, when the sun shines an average of 10 hours 2 minutes a day.Least sunny months in Saint John: January, November and December receive an average of 4 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint John, New Brunswick, Canada.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 126 186 242 227 280 307 303 312 266 221 159 153
Mean daily daylight hours 9h 10m 10h 24m 11h 57m 13h 32m 14h 53m 15h 34m 15h 12m 13h 59m 12h 28m 10h 53m 9h 30m 8h 46m

Solar UV radiation in Saint John, New Brunswick, Canada §

Saint John experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 8 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Saint John UV Index data.

Average daily maximum UV levels by month for Saint John, New Brunswick, Canada.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 3 5 7 9 10 8 8 7 5 3 2