Montreal weather in August
Montreal in August averages 20°C (68°F), 86 mm of rain and 8.2 hours of sun a day.
Of the twelve months in Montreal, August is the second warmest, the fifth wettest and the third sunniest.
- Average temp
- 20°C (68°F)
14–26°C · 58–78°F
- Rainfall
- 86 mm
Showers likely
- Sunshine
- 8.2 h
hours per day
What is Montreal like in August?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Montreal in August?
High-factor sun cream
With 8.2 hours of sun a day, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
A light rain jacket
About 86 mm falls this month — showers rather than washouts.
A layer for the evening
The day swings about 11°C between its low and its high.
August compared with July and September
August in Montreal is 1.1°C cooler than July and 19 mm drier than it, which averages 21°C (70°F).
August in Montreal is 4.7°C warmer than September and about as wet as it, which averages 15°C (60°F).
Daylight in Montreal in August
On 15 August the sun is up for 14 hours 5 minutes in Montreal, rising about 05:55 and setting about 20:00 local time.
August ends 1 hour 25 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 35 minutes short of June, the longest-lit month here.
Where to stay in Montreal
Dates are a starting point for August.
Travel guides for Montreal
What to read before you book.
Montreal weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | -10°C / 14°F | 74 mm |
| February | -8°C / 18°F | 56 mm |
| March | -2°C / 28°F | 72 mm |
| April | 6°C / 42°F | 84 mm |
| May | 13°C / 56°F | 78 mm |
| June | 18°C / 65°F | 88 mm |
| July | 21°C / 70°F | 105 mm |
| August | 20°C / 68°F | 86 mm |
| September | 15°C / 60°F | 91 mm |
| October | 8°C / 47°F | 94 mm |
| November | 2°C / 35°F | 85 mm |
| December | -5°C / 23°F | 78 mm |
Check another month
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FAQs about Montreal in August
August climate averages for Montreal, 1991–2020.
Montreal averages 20°C (68°F) in August, ranging from about 14°C (58°F) at night to 26°C (78°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 86 mm falls across August, enough to need a light jacket but not enough to reshape a trip.
Yes. August averages 20°C (68°F) against 15°C (60°F) in September — 4.7°C warmer.
August is 1.1°C cooler than July, and 19 mm drier.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 8.2 hours of sun a day on the 1991–2020 average — among the brighter months anywhere.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 14 hours 5 minutes of daylight in mid-August, against 15 hours 40 minutes in June and 8 hours 44 minutes in December.
On 15 August, sunrise is about 05:55 and sunset about 20:00 local time. Both shift across the month — the month ends 1 hour 25 minutes shorter than it starts.
