St. John's weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Poor
Best time to visit: May – August
What is the weather like in St. John's in August?
In August, St. John's is mild: daytime highs average 20 °C, and nights cool down to about 14 °C. The sea averages 14.5 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 81 mm in total. All in all, August is not an ideal month for a holiday in St. John's.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 23 | 24 | 17 |
| Day | 20° | 20° | 17° |
| Night | 13° | 14° | 11° |
| Sea | 11° | 15° | 13° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 10 | 11 | 11 |
More details for August
- Daylight
- 14 h 20 min05:56 – 20:16
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 71 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−2:30America/St_Johns
How the score comes together
- Temperatureweight 35 %15 %
- Seaweight 25 %0 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 20 %52 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
St. John's in August: quick answers
Is St. John's hot in August?
No. In August, St. John's is mild: daytime highs average 20 °C and nights drop to about 14 °C.
Can you swim in St. John's in August?
Only if you don't mind cold water: in August the sea averages just 14.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in St. John's in August?
Rain is frequent, with about 11 rainy days and 81 mm in total.
St. John's month by month
The whole year in St. John'sAll destinations: CanadaWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences