15-Day Weather Forecast - Ottawa

15-day weather forecast for Ottawa: temperatures from 3°C (37°F) to 24°C (75°F). Average daily high 18°C (64°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +18°C

15-Day Temperature Trend

18°8°TodaySep24°9°Tmrw24°15°Sun18°9°Mon17°7°Tue22°14°Wed14°11°Thu11°9°Fri11°9°Sat17°7°Sun19°7°Mon20°9°Tue22°13°Wed13°7°Thu15°3°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +18°/+8°
    feels +17°14 km/hUV 6 · Mod
    06:3619:21
  • Sat, Sep 12Tomorrow
    +24°/+9°
    feels +25°0 mm · 6%13 km/hUV 6 · Mod
    06:3719:19
  • Sun, Sep 13Sun
    +24°/+15°
    feels +22°3.0 mm · 49%21 km/hUV 5 · Mod
    06:3919:17
  • Mon, Sep 14Mon
    +18°/+9°
    feels +15°0 mm · 12%15 km/hUV 5 · Mod
    06:4019:15
  • Tue, Sep 15Tue
    +17°/+7°
    feels +14°0.9 mm · 53%17 km/hUV 4 · Mod
    06:4119:13
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  • Wed, Sep 16Wed
    +22°/+14°
    feels +21°0.6 mm · 35%13 km/hUV 4 · Mod
    06:4219:11
  • Thu, Sep 17Thu
    +14°/+11°
    feels +12°1.5 mm · 29%10 km/hUV 1 · Low
    06:4319:09
  • Fri, Sep 18Fri
    +11°/+9°
    feels +10°5.7 mm · 23%17 km/hUV 1 · Low
    06:4519:07
  • Sat, Sep 19Sat
    +11°/+9°
    feels +10°9.3 mm · 10%9 km/hUV 1 · Low
    06:4619:06
  • Sun, Sep 20Sun
    +17°/+7°
    feels +14°0 mm · 17%16 km/hUV 5 · Mod
    06:4719:04
  • Mon, Sep 21Mon
    +19°/+7°
    feels +19°0 mm · 10%7 km/hUV 5 · Mod
    06:4819:02
  • Tue, Sep 22Tue
    +20°/+9°
    feels +17°0 mm · 16%20 km/hUV 5 · Mod
    06:4919:00
  • Wed, Sep 23Wed
    +22°/+13°
    feels +19°2.1 mm · 29%31 km/hUV 4 · Mod
    06:5118:58
  • Thu, Sep 24Thu
    +13°/+7°
    feels +11°0.3 mm · 26%25 km/hUV 4 · Mod
    06:5218:56
  • Fri, Sep 25Fri
    +15°/+3°
    feels +12°0 mm · 35%16 km/hUV 4 · Mod
    06:5318:54

Weather Insight

Ottawa's 15-day outlook ranges from a low of 3°C to a high of 24°C, with an average daytime high near 18°C. That's 4° below the long-term average high of 22°C for this time of year. Air quality is currently good (AQI 24), with no notable outdoor health concerns.

Today vs Normal

18°C-4° below normal

The long-term average high for today is 22°C.

Air Quality

Air Quality
Good

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Extended Outlook for Ottawa

Over the next 15 days, Ottawa is forecast to see temperatures ranging from 3°C to 25°C, averaging a daily high of 18°C. The extended outlook indicates occasional showers on 8 days, with 23.4 mm total accumulation. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.