Canada Montreal Weather in August — Climate Guide
August in Montreal is Very Good
August is Very Good for Montreal.
August matches July's peak. 15-25°C + 9 sunshine hours. International des Feux final week + Osheaga Music Festival (first weekend of August, Parc Jean-Drapeau, $110-300, 100+ artists with past headliners Foster the People, Lana Del Rey, Lorde, Kendrick Lamar) + Pride Montreal (second week of August, LGBTQ festival, Canada #2 Pride, parade Sunday).
Korean + Japanese summer + late-summer European tourism drive hotel rates 1.5-2x. Sunday Pride parade (second Sunday of August) is the festival climax. Rainbow Crosswalks on Sainte-Catherine East from May-Sep peak engagement.
Travel score
Osheaga + Pride Montreal + Feux finale = peak festivals
August Weather at a Glance
August averages 77°F / 25°C highs and 59°F / 15°C lows with 9 sunshine hours and 11 rainy days (humidity 70%, heaviest of the year). Sunrise 5:50 AM, sunset 8:00 PM = 14h 10min daylight. Slightly cooler + slightly less sunshine than July but more humid.
August Travel Advice
Osheaga 3-day pass sells out 6 months ahead — book by February. Pride Sunday parade arrive 9-10 AM for Sainte-Catherine East curb spot. Feux fireworks finale first week of August from Jacques-Cartier Bridge — peak Saturday night viewing. Book hotels 6-8 weeks ahead.
Flying In from Overseas
Korean Liberation Day (Aug 15) holiday + Japan Obon (mid-Aug) drive Asian inbound spike. Direct flights from Seoul/Tokyo via NYC or YYZ $1,200-2,000. European school holidays still in full swing. Australian winter shoulder.
August Pricing Trends
Year's peak pricing continues: 4-star Downtown $220-500/night, 5-star $410-780, Plateau boutique $150-370. Osheaga 3-day pass $110-300. Pride parade free (VIP bleachers $74-185). Flights from Korean/Japan via NYC $1,200-2,000.
Montreal August Weather Stats
Avg High
25°C
Avg Low
15°C
Rainy Days
11
88mm total
Sunshine
9h
Daily avg
Humidity
70%
Humid
UV Index
7
High
Wind
10 km/h
Gusts 22
Sea Temp
20°C
Best swimming
Crowds
Very busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
14 μg/m³
PM10
26 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
28°C
Nighttime
16°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 22 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Pride Montreal + Osheaga Music Festival
- Feux fireworks finale
- Summer peak with all festivals running
Cons
- Hotels 1.5-2x peak + Korean Liberation Day airfare spike
- Humidity 70%
- Peak crowds everywhere
August Events & Festivals
- International des Feux Loto-Québec — first week of August (fireworks finale)
- Osheaga Music Festival — first weekend of August (Parc Jean-Drapeau, rock + electronic, world-class)
- Pride Montreal — second week of August (LGBTQ festival, 1M attendees, Canada #2 Pride)
- Heavy MTL — late July to early Aug (metal + hardcore festival)
- Quebec Construction Holiday (last 2 weeks of July) drives Quebec domestic tourism
Montreal in August — Full Picture
August matches July's peak. 15-25°C + 9 sunshine hours. International des Feux final week + Osheaga Music Festival (first weekend of August, Parc Jean-Drapeau, $110-300, 100+ artists with past headliners Foster the People, Lana Del Rey, Lorde, Kendrick Lamar) + Pride Montreal (second week of August, LGBTQ festival, Canada #2 Pride, parade Sunday).
Korean + Japanese summer + late-summer European tourism drive hotel rates 1.5-2x. Sunday Pride parade (second Sunday of August) is the festival climax. Rainbow Crosswalks on Sainte-Catherine East from May-Sep peak engagement.
What to Wear & What to Pack
Mid-summer + humidity. Same as July. T-shirt + shorts + swimsuit. UV 7 + humidity 70%.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
10.7°C
1°C
13/mo
Summer (Jun·Jul·Aug)
Current25°C
14.7°C
11.7/mo
Autumn (Sep·Oct·Nov)
13°C
5°C
12.7/mo
Winter (Dec·Jan·Feb)
-3.3°C
-12°C
13.3/mo
Montreal Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| -5° | -14° | 14d·78mm | 3h | 75% | 1 | Quiet | Low season | |
| -3° | -12° | 12d·62mm | 4.5h | 72% | 2 | Quiet | Low season | |
| 2° | -6° | 13d·75mm | 5.5h | 70% | 3 | Quiet | Shoulder | |
| 11° | 1° | 13d·80mm | 7h | 65% | 5 | Moderate | Shoulder | |
| May (Best) | 19° | 8° | 13d·75mm | 8h | 62% | 6 | Moderate | Shoulder |
| June (Best) | 24° | 13° | 12d·87mm | 9.5h | 65% | 8 | Busy | Peak |
| July (Best) | 26° | 16° | 12d·90mm | 10h | 67% | 9 | Very busy | Peak |
| August (Best) | 25° | 15° | 11d·88mm | 9h | 70% | 7 | Very busy | Peak |
| September (Best) | 20° | 11° | 12d·87mm | 7.5h | 72% | 5 | Busy | Peak |
| 13° | 5° | 12d·78mm | 6h | 75% | 3 | Moderate | Shoulder | |
| 6° | -1° | 14d·92mm | 3.5h | 78% | 2 | Quiet | Low season | |
| -2° | -10° | 14d·88mm | 2.5h | 78% | 1 | Busy | Peak |
View Other Months
Montreal August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Montreal?
Montreal in August is Very Good. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Montreal in August?
Montreal August averages a high of 25°C and a low of 15°C.
Does it rain much in Montreal in August?
Montreal August averages 88mm of rainfall over about 11 rainy days.
What should I wear in Montreal in August?
Mid-summer + humidity. Same as July. T-shirt + shorts + swimsuit. UV 7 + humidity 70%.
What time are sunrise and sunset in Montreal in August?
Montreal August sunrise is 05:50 and sunset is 20:00, with 14h 10m of daylight.
What's the air quality like in Montreal in August?
Montreal August air quality (AQI) averages 42, rated Good. PM2.5 averages 14μg/m³.
What activities are recommended in Montreal in August?
In August, Montreal is great for Osheaga Music Festival, Pride Montreal parade, Feux fireworks finale.
Is August peak season in Montreal?
Montreal August crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Montreal
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.