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Montreal in August

Montreal Weather in August

🇨🇦 Canada

25°C
High
17°C
Low
12
Rain Days
11h
Sunshine
65%
Humidity

North America › 🇨🇦 Canada › Montreal

Updated: March 2026

Is August a Good Time to Visit Montreal?

6/10
Good

August is a good time to visit Montreal (6/10). With 11 daily sunshine hours and only 12 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 3rd sunniest of the year in Montreal. Culture-focused travellers and those who prefer lighter crowds will find August a practical choice, with prices running lower than peak July without sacrificing all the good weather. September offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Montreal's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.

vs July:26°C avg high

Step off the plane in Montreal in August and the air meets you at around 25°C, a temperature that feels genuinely welcoming after a long flight. By the time evening arrives and temperatures settle near 17°C, the city takes on a different character entirely. With 11 hours of daylight sun on offer, August gives you the raw material for a genuinely memorable trip.

25°C

Avg High

17°C

Avg Low

12 days

Rain Days

11h

Sunshine

65%

Humidity

Temperature in Montreal in August

The 8°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 10 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Wind averages 16 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 77°F average high, 63°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in August

Monthly Precipitation (mm)

What to Wear in Montreal in August

Morning17°CBefore the day warms up
Afternoon25°CPeak daytime temperature
Evening20°CAfter sunset cools down

Packing for Montreal in August means dressing for 25°C days and 17°C evenings. A light cotton tee with a casual overshirt works well at 25°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 17°C, a modest 8°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 12 potential rainy days.

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Local tip: Layers are more practical than a single heavy garment in Montreal. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.

Events in Montreal in August

August has no major festivals or public holidays in Montreal, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Montreal in August

Based on 25°C average highs and 12 rainy days

  • Light layers for morning and evening
  • Breathable T-shirts and comfortable trousers
  • UV-protective sunglasses
  • Compact folding umbrella
  • Waterproof outer layer or packable rain jacket
  • Quick-dry clothing that recovers fast after a shower
  • SPF 30+ sunscreen
  • Comfortable walking shoes (a second pair lets the first air out overnight)
  • Universal travel adapter
  • Small day pack for city exploration
  • Reusable water bottle

Best Activities in Montreal in August

  • Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 25°C, the temperature is ideal for extended walking without overheating
  • Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
  • Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
  • Day trip to the surrounding countryside or coastFull day (depart by 8am)August is reliably dry enough for rural day trips without weather risk
  • Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
  • Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
  • Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
  • Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningAugust brings distinct seasonal changes to public green spaces worth exploring
  • Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmAugust seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Montreal warm in August?

August in Montreal reflects a mid-latitude climate pattern, with temperatures averaging 25°C by day and 17°C overnight. The city sits at 46 degrees north latitude, where the balance between solar radiation and heat loss drives conditions that are neither extreme nor static. The warm temperatures reflect a stable high-pressure pattern typical of the season, which suppresses cloud formation and concentrates solar energy at the surface. Day-to-night temperature variation of 8°C is moderate and manageable with a single mid-layer. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Montreal in August

In August, Montreal experiences average highs of 25°C (77°F) and lows of 17°C (63°F). Expect around 12 rainy days and 11 hours of sunshine per day, with humidity averaging 65%. The 8°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 10, so sun protection is advisable on clear days.
Montreal typically sees 12 rainy days in August, with total precipitation of around 100mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Montreal typically sees 4-6 fewer rain days than August.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Montreal in August. Daytime temperatures of 25°C are pleasant, but the evening drop to 17°C means a jacket is essential if you plan to be out after dark. With 12 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
August is a reasonable time to visit Montreal. Expect 12 rainy days, so pack a light rain layer for flexibility. Average temperatures of 25°C make outdoor exploration comfortable during the dry periods. With 11 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Montreal in August is 25°C (77°F), and the average low is 17°C (63°F). The mean daily temperature is approximately 21°C (70°F). The day-to-night range of 8°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Montreal is generally September. September offers the most sunshine at 9 hours per day and only 10 rainy days. Average temperatures reach 21°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around September gives you the best chance of dry, bright weather.
August is shoulder or low season in Montreal, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 12 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In August, Montreal suits a range of activities thanks to mild temperatures around 25°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.

August ranks 3rd sunniest of the year in Montreal, with an average 11 daily sunshine hours. The driest months are February, September, and January. July is the hottest month (26°C avg high); January is the coolest (-5°C). From here, temperatures fall 4°C into September. Compared to last month (July: 26°C high, 13 rain days), August is cooler and drier. August is among the top three sunniest months to visit Montreal.

Year-Round Climate

MonthHighLowRain DaysSunDetails
January-5°C-14°C116hView
February-3°C-12°C107hView
March3°C-7°C118hView
April11°C1°C129hView
May19°C8°C1210hView
June23°C14°C1211hView
July26°C17°C1312hView
August25°C17°C1211hView
September21°C13°C109hView
October13°C6°C127hView
November6°C0°C125hView
December-1°C-8°C125hView

Other Months in Montreal

JanFebMarAprMayJunJulAugSepOctNovDec

Plan Your Trip to Montreal

Best Time to Visit MontrealMontreal vs Boston in AugustMontreal vs Quebec City in August

Nearby Destinations with Similar Weather

These cities are within 500 km and experience broadly comparable weather conditions during the same calendar month, making them practical standalone alternatives or worthwhile additions to a longer regional itinerary.

Boston🇺🇸 United States403 km away
27°C18°C low
Quebec City🇨🇦 Canada233 km away
23°C15°C low

Data Sources for Montreal

Montreal on WikipediaOpen-Meteo Climate APINOAA National CentersUK Met OfficeWMOGeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.