Ottawa weather live forecast

Today's maximum temperature in Ottawa is expected to be 91°F. Select a day from the live weather forecast for Ottawa, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:00 on Sunday 17th August 2025 GMT

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The 5-day weather forecast for Ontario (Ottawa) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Ottawa weather forecast by day

Below are the detailed weather forecasts for Ottawa for the next 5 days.

Ottawa weather for Saturday 16th August 2025

Expect clear skies in Ottawa, Ontario with a maximum temperature of 91°F, moderate levels of heat & humidity, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the south-west.

  • 91°F maximum temperature91
    °F maximum temperature
  • 61°F minimum temperature61
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 8 mph from the South-West8
    mph wind from SW

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Ottawa weather for Sunday 17th August 2025

Expect mostly cloudy with rain in Ottawa, Ontario with a maximum temperature of 73°F, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 81% chance of some rain and a gentle breeze of 12 mph from the north.

  • 73°F maximum temperature73
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 81% chance of some rain81
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 12 mph from the North12
    mph wind from N

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Ottawa weather for Monday 18th August 2025

Expect scattered clouds in Ottawa, Ontario with a maximum temperature of 70°F, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the north-east.

  • 70°F maximum temperature70
    °F maximum temperature
  • 52°F minimum temperature52
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 8 mph from the North-East8
    mph wind from NE

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Ottawa weather for Tuesday 19th August 2025

Expect overcast skies in Ottawa, Ontario with a maximum temperature of 70°F, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the east.

  • 70°F maximum temperature70
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Overcast skies
    overcast skies
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 8 mph from the East8
    mph wind from E

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Ottawa weather for Wednesday 20th August 2025

Expect overcast skies in Ottawa, Ontario with a maximum temperature of 72°F, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the east.

  • 72°F maximum temperature72
    °F maximum temperature
  • 61°F minimum temperature61
    °F minimum temperature
  • Overcast skies
    overcast skies
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 7 mph from the East7
    mph wind from E

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