Montreal weather in August 2025

Expect daytime maximum temperatures of 25°C in Montreal in August based on long-term weather averages. There are 7 hours of sunshine per day on average with 13 days with some rainfall and typically 101 mm of rainfall in the month.

  • 25°C maximum daytime temperature in August in Montreal25
    25°C max day temperature
  • 7 hours of sunshine per day
  • 13 days with some rainfall in August in Montreal13
    13 days with some rainfall
  • 15°C minimum night-time temperature in August in Montreal15
    15°C min night temperature
  • 14 hours of daylight per day in August in Montreal14
    14 hours of daylight per day
  • Low heat & humidity in August in MontrealL
    Low heat & humidity
  • 101 mm monthly rainfall in August in Montreal101
    101 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Montreal7
    7 (High) UV index

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The August weather guide for Quebec (Montreal) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Montreal in August?

Daytime temperatures usually reach 25°C in Montreal in August with low heat and humidity, falling to 15°C at night.

How sunny is it in Montreal in August?

There are normally 7 hours of bright sunshine each day in Montreal in August - that's 53% of daylight hours.

Does it rain in Montreal in August?

There are usually 13 days with some rain in Montreal in August and the average monthly rainfall is 101mm.

Montreal August sunrise & sunset times

Browse the sunrise and sunset times for Montreal in August 2025. Select a month to view Montreal sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:39 19:22
Saturday, 16th August 2025 04:56 19:00
Sunday, 31st August 2025 05:15 18:33

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