August weather forecastSaint John, Canada
August
Weather in August
The month of August maintains the summer heat, albeit Saint John, Canada sees temperatures slightly starting to moderate. As the summer winds down, days gradually become shorter, yet the weather remains pleasant for outdoor enjoyment. It is also the home stretch for summer events and festivals taking place around the city. The sea waters around the city also reach their warmest, scarcely inviting for swimming and other beach activities. In August, the temperature lies between 14.3°C (57.7°F) and 21.5°C (70.7°F), representing high summer conditions.Temperature
The average temperatures reach their apex in August, averaging 21.5°C (70.7°F) at the high end and 14.3°C (57.7°F) at the low end.Humidity
In Saint John, the average relative humidity in August is 82%.Rainfall
The month with the least rainfall is August, when the rain falls for 11.1 days and typically collects 22mm (0.87") of precipitation.Snowfall
In Saint John, Canada, snow does not fall in June through October.Sea temperature
With an average sea temperature of 13.3°C (55.9°F), August is the month with the warmest seawater in Saint John.Note: Dipping into 13.3°C (55.9°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.
Daylight
In Saint John, the average length of the day in August is 14h and 2min.On the first day of August in Saint John, sunrise is at 6:09 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 8:03 pm ADT.
Sunshine
August has the most sunshine of the year, with an average of 9.5h of sunshine.UV index
July and August, with an average maximum UV index of 5, are months with the highest UV index in Saint John. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In August, the maximum UV index of 5 translates into these guidelines:
Put precautions into practice - Protective measures against sun-induced damage are advised. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Saint John, Canada
- Average high temperature in August: 21.5°C
The warmest month (with the highest average high temperature) is August (21.5°C).
The month with the lowest average high temperature is January (-1.9°C).
- Average low temperature in August: 14.3°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (-8.6°C).
Average pressure in August
Saint John, Canada
- Average pressure in August: 1014.3mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is June (1012.8mbar).
Average wind speed in August
Saint John, Canada
- Average wind speed in August: 12.3km/h
The windiest month (with the highest average wind speed) is January (19.9km/h).
The calmest month (with the lowest average wind speed) is August (12.3km/h).
Average humidity in August
Saint John, Canada
- Average humidity in August: 82%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are October and November (80%).
Average rainfall in August
Saint John, Canada
- Average rainfall in August: 22mm
The wettest month (with the highest rainfall) is December (43mm).
The driest month (with the least rainfall) is August (22mm).
Average rainfall days in August
Saint John, Canada
- Average rainfall days in August: 11.1 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in August
Saint John, Canada
- Average snowfall in August: 0mm
The month with the highest snowfall is January (40mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in August
Saint John, Canada
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is March (9.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in August
Saint John, Canada
- Average sea temperature in August: 13.3°C
The best month for swimming (with the highest average sea temperature) is August (13.3°C).
The coldest month (with the lowest average sea temperature) is March (2.9°C).
Average daylight in August /
Average sunshine in August
Saint John, Canada
- Average daylight in August: 14h and 0min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in August: 9h and 30min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in August
Saint John, Canada
- Average sunshine days in August: 16.9 days
The month with the most sunshine days is January (18.9 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in August
Saint John, Canada
- Average UV index in August: 5
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in August
Saint John, Canada
- Average cloud cover in August: 36
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in August
Saint John, Canada
- Average visibility in August: 9km
The month with the highest visibility is October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, November and December (9km).
