St. John's, Canada Weather
St. John's hourly forecast: next 24 hours
Today's high of 65°F (18°C) is about 3°F (2°C) above the typical September high of 62°F (17°C).
Current conditions in detail
St. John's weather tomorrow (Wednesday, September 16)
Tomorrow in St. John's looks fog, with a high of 63° and an overnight low of 51°. There is a 96% chance of rain - plan accordingly. Winds top out near 7 mph, and the UV index reaches 1 (low).
St. John's 14-day forecast
About the weather in St. John's
St. John's spends most of the year cold. August, the warmest month, averages 68°F (20°C) by day - a figure many cities in our dataset pass in early spring - while February holds at 33°F (0°C) with 158 wet days a year across the whole calendar.
St. John's weather: quick facts
- Hottest month: August - highs near 68°F (20°C)
- Coldest month: February - highs near 33°F (0°C)
- Decade extremes (2015-2024): 83°F (28°C) high · 2°F (-16°C) low
- Wettest month: January (16 rainy days) · Sunniest: July (9.0 h sun/day)
- Climate type: humid continental
- Annual swing: 20°C between the average warmest and coolest month · day to night: 6°C
- Snow: about 42 days a year
- Months with freezing average lows: 5
- Average humidity: 82%
Temperatures through the year
February is the coolest month, with highs of 33°F (0°C) and lows near 21°F (-6°C). August is the warm end of the year, averaging 68°F (20°C) by day and 58°F (14°C) overnight. Precipitation concentrates in January - 6.1 inches (156 mm) on 16 days - and thins out by July.
Rain, sun and snow
Snow falls on roughly 42 days a year, mostly November through May. Sunshine averages 6.3 hours a day over the year - duller than almost anywhere else we cover, peaking in July at 9.0 hours. Relative humidity averages 82% across the year, more humid than 92% of the 3496 cities in our dataset. Days and nights are about 6°C apart on average - narrower than all but 8% of the 3496 cities in our dataset. The gridded 2015-2024 daily record for this location tops out at 83°F (28°C) and bottoms at 2°F (-16°C) - decade extremes, not all-time station records.
Season by season
Spring (March through May)
Spring runs cold here - highs near 41°F (5°C), nights near 30°F (-1°C), and rain falls on around 40 of the 90 days, plus about 13 snowy days.
Summer (June through August)
Summer runs cool rather than cold here - highs near 64°F (18°C), nights near 53°F (11°C), and rain falls on around 36 of the 90 days.
Fall (September through November)
Fall is chilly here - highs near 53°F (12°C), nights near 44°F (7°C), and rain falls on around 39 of the 90 days, plus about 3 snowy days.
Winter (December through February)
Winter brings deep cold here - highs near 34°F (1°C), nights near 24°F (-4°C), and rain falls on around 44 of the 90 days, plus about 26 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in St. John's by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 33° | 23° | 16 | 6.1 in | 3.9 h/day | 81% |
| February | 33° | 21° | 14 | 5.0 in | 4.8 h/day | 77% |
| March | 35° | 24° | 14 | 5.0 in | 6.5 h/day | 79% |
| April | 41° | 31° | 14 | 4.8 in | 6.6 h/day | 82% |
| May | 49° | 36° | 12 | 3.6 in | 8.6 h/day | 82% |
| June | 58° | 46° | 13 | 4.2 in | 7.8 h/day | 85% |
| July | 66° | 54° | 12 | 3.6 in | 9.0 h/day | 86% |
| August | 68° | 58° | 11 | 3.7 in | 8.9 h/day | 83% |
| September | 62° | 52° | 12 | 4.7 in | 7.2 h/day | 82% |
| October | 53° | 44° | 12 | 3.9 in | 5.6 h/day | 81% |
| November | 45° | 36° | 14 | 6.1 in | 3.9 h/day | 81% |
| December | 37° | 28° | 14 | 5.0 in | 3.2 h/day | 80% |