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Weather in August
Temperature
Thunder Bay marks the arrival of August with an average high-temperature of a still moderately hot 23.3°C (73.9°F), hardly different from July's 24.3°C (75.7°F). Thunder Bay reports a marked divergence from daytime peaks throughout August, with lows averaging at a fresh 10.4°C (50.7°F).Rainfall
The month with the most rainfall in Thunder Bay is August, when the rain falls for 12.3 days and typically aggregates up to 90mm (3.54") of precipitation.Snowfall
June through August are months without snowfall.Sea temperature
August and September, with an average sea temperature of 13°C (55.4°F), are months with the warmest seawater.Note: With an efficient thermal swimsuit, one can navigate 13°C (55.4°F) even if it's colder than 10°C (50°F); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 13°C (55.4°F) feels chilly.
Daylight
In Thunder Bay, the average length of the day in August is 14h and 16min.On the first day of the month, sunrise is at 6:33 am and sunset at 9:33 pm. On the last day of August, in Thunder Bay, sunrise is at 7:14 am and sunset at 8:39 pm EDT.
Sunshine
In Thunder Bay, the average sunshine in August is 8.3h.UV index
In Thunder Bay, Canada, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: During August, 6 as the daily maximum UV index converts into the following advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What are August temperatures in Thunder Bay?
What is the wettest month in Thunder Bay?
How much does it rain in Thunder Bay in August?
When it does not snow in Thunder Bay?
Does it snow in Thunder Bay in August?
When is the sea warmest in Thunder Bay?
How cold is the water in August in Thunder Bay?
What is the average length of the day in August in Thunder Bay?
When is the sunrise / sunset in August in Thunder Bay?
How long on average sun shines in August in Thunder Bay?
What is the UV index reading in August in Thunder Bay?
Average temperature in August
Thunder Bay, Canada
- Average high temperature in August: 23.3°C
The warmest month (with the highest average high temperature) is July (24.3°C).
The month with the lowest average high temperature is January (-8°C).
- Average low temperature in August: 10.4°C
The month with the highest average low temperature is July (11.1°C).
The coldest month (with the lowest average low temperature) is January (-20.6°C).
Average rainfall in August
Thunder Bay, Canada
- Average rainfall in August: 89.5mm
The wettest month (with the highest rainfall) is August (89.5mm).
The driest month (with the least rainfall) is January (0.4mm).
Average rainfall days in August
Thunder Bay, Canada
- Average rainfall days in August: 12.3 days
The month with the highest number of rainy days is June (13.8 days).
The month with the least rainy days is January (0.6 days).
Average snowfall in August
Thunder Bay, Canada
- Average snowfall in August: 0mm
The month with the highest snowfall is December (389mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in August
Thunder Bay, Canada
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average sea temperature in August
Thunder Bay, Canada
- Average sea temperature in August: 13°C
The best months for swimming (with the highest average sea temperature) are August and September (13°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (2°C).
Average daylight in August /
Average sunshine in August
Thunder Bay, Canada
- Average daylight in August: 14h and 2min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in August: 8h and 2min
The month with the most sunshine is June (Average sunshine: 8h and 42min).
The months with the least sunshine are November and December (Average sunshine: 2h and 54min).
Average UV index in August
Thunder Bay, Canada
- Average UV index in August: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).
Thunder Bay, Canada
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