St. John's
Canada
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
St. John's, Canada

The last month of the summer, August, is also an agreeable month in St. John's, with average temperature fluctuating between 11.6°C (52.9°F) and 20.5°C (68.9°F).

Temperature

In St. John's, the average high-temperature is essentially the same as in July - a still pleasant 20.5°C (68.9°F). The average low-temperature, in August, in St. John's, is 11.6°C (52.9°F).

Rainfall

In St. John's, during August, the rain falls for 13.7 days and regularly aggregates up to 100mm (3.9") of precipitation. Throughout the year, in St. John's, there are 162.7 rainfall days, and 1206.5mm (47.5") of precipitation is accumulated.

Snowfall

In St. John's snow does not fall in July through September.

Sea temperature

August is the month with the warmest seawater in St. John's, with an average sea temperature of 13.9°C (57°F).
Note: Swimming in 13.9°C (57°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In August, the average length of the day in St. John's is 14.2h.

Sunshine

The average sunshine in St. John's, Canada, is 6.7h.

UV index

The average daily maximum UV index in St. John's is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in August in St. John's?

The average high-temperature, in August, is 20.5°C (68.9°F), while the average low-temperature is 11.6°C (52.9°F).

How many days does it rain in August in St. John's?

In August, the rain falls for 13.7 days. Throughout August, 100mm (3.9") of precipitation is accumulated.

When it does not snow in St. John's?

In St. John's snow does not fall in July through September.

What is the month with the warmest sea water in St. John's?

The month with the warmest seawater is August, with an average sea temperature of 13.9°C (57°F).

What is the sea water temperature in August in St. John's?

In St. John's, in August, the average water temperature is 13.9°C (57°F). Swimming in 13.9°C (57°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does St. John's have in August?

The average length of the day in August is 14.2h.

How many hours of sunshine does St. John's have in August?

In August, the average sunshine in St. John's, Canada, is 6.7h.

How high is the UV index in August in St. John's?

The average daily maximum UV index in August in St. John's is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV rays.
Average temperature in August - St. John
  • Average high temperature in August: 20.5°C

The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is February (-1.1°C).

  • Average low temperature in August: 11.6°C

The month with the highest average low temperature is August (11.6°C).
The coldest month (with the lowest average low temperature) is February (-8.6°C).

Average rainfall in August - St. John
  • Average rainfall in August: 100mm

The wettest month (with the highest rainfall) is October (153.7mm).
The driest month (with the lowest rainfall) is February (61.6mm).

Average rainfall days in August - St. John
  • Average rainfall days in August: 13.7 days

The month with the highest number of rainy days is October (18.1 days).
The month with the lowest number of rainy days is February (8.6 days).

Average snowfall in August - St. John
  • Average snowfall in August: 0mm

The month with the highest snowfall is January (887mm).
Months with the lowest snowfall are July, August and September (0mm).

Average snowfall days in August - St. John
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (18.3 days).
Months with the lowest number of snowfall days are July, August and September (0 days).

Average sea temperature in August - St. John
  • Average sea temperature in August: 13.9°C

The best month for swimming (with the highest average sea temperature) is August (13.9°C).
The coldest month (with the lowest average sea temperature) is March (-0.4°C).

Average daylight in August / Average sunshine in August - St. John
  • Average daylight in August: 14.2h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in August: 6.7h

The month with most sunshine is July (Average sunshine: 7h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in August - St. John
  • Average UV index in August: 6

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).