St. John's weather in December
December in St. John's: hot, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in St. John's · #82 of 604 destinations to visit in December · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
St. John's climate normals — December
| Daytime high | 27°C / 81°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 29°C / 84°F | |
| Rainfall | 40 mm / 1.6 in | 🌦 some rain |
| Rainy days | 13 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 11.1 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. John's in December — FAQ
- Is December a good time to visit St. John's?
- December in St. John's: hot, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for St. John's on SeasonMap's comfort score (85/100).
- What is the weather like in St. John's in December?
- In December, St. John's averages a daily high of 27.2°C and a low of 25.1°C, with about 40 mm of rain over roughly 13.4 rainy days.
- What is the air quality in St. John's in December?
- St. John's has a mean US Air Quality Index of about 38 in December.