St. John's weather in August
August in St. John's: hot, rainy, with clean air — an excellent time to visit.
#11 of 12 months in St. John's · #300 of 604 destinations to visit in August · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
St. John's climate normals — August
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 94 mm / 3.7 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.7 h | |
| Wind | 30 km/h / 18 mph | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is St. John's?
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St. John's in August — FAQ
- Is August a good time to visit St. John's?
- August in St. John's: hot, rainy, with clean air — an excellent time to visit. It ranks #11 of 12 months for St. John's on SeasonMap's comfort score (80/100).
- What is the weather like in St. John's in August?
- In August, St. John's averages a daily high of 29.2°C and a low of 26.8°C, with about 94.2 mm of rain over roughly 16.6 rainy days.
- What is the air quality in St. John's in August?
- St. John's has a mean US Air Quality Index of about 46 in August.