Ottawa
Canada · North America
Year-round range: 9°F to 79°F
September
Excellent conditions this month
Your monthly fit score
Comfort fit by month.
Climate details▼
Temperature
Average highs and lows.
September has comfortable temperatures — not too hot, not too cold.
Shaded band = typical daily swing (P10 of night lows to P90 of afternoon peaks) — spans wider than avg high/low lines because it captures day-to-day variation.
| = SepPrecipitation
Monthly precipitation, wet-day risk, and snow signal where relevant.
September is one of the wetter months — pack rain gear.
Sunshine
Average hours of bright sun per day.
September has decent sunshine — a mix of sun and cloud.
Clear sky
Clear-sky share is the inverse of average cloud cover (100% minus cloud cover). Band labels follow standard meteorological categories; distribution within each band varies by day.
Air comfort by month
Humidity and heat feel by month.
September is mostly comfortable — low heat and humidity pressure.
Time-of-day patterns
Typical hourly rhythm for September.
Temperature by hour
Temperature by hour and month
Typical temperature through the day across the year (1996-2025 normals, local time). Shaded cells are nighttime.
In September, afternoons reach about 69° and nights settle near 54°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 24°F | 9°F | 12 | 2.5in | 2.7h | 75.14285714285714% |
| Feb | 27°F | 10°F | 11 | 2.1in | 3.4h | 72% |
| Mar | 38°F | 21°F | 11 | 2.6in | 4.1h | 67.57142857142857% |
| Apr | 53°F | 34°F | 12 | 3.1in | 4.9h | 61.57142857142857% |
| May | 67°F | 47°F | 14 | 3.0in | 5.8h | 62.57142857142857% |
| Jun | 75°F | 57°F | 16 | 3.6in | 6.2h | 67.14285714285714% |
| Jul | 79°F | 62°F | 16 | 3.6in | 7.1h | 70.42857142857143% |
| Aug | 77°F | 61°F | 14 | 3.4in | 6.4h | 72.42857142857142% |
| Sep | 70°F | 54°F | 11 | 3.1in | 5.7h | 73.42857142857143% |
| Oct | 57°F | 43°F | 14 | 3.2in | 3.8h | 74.14285714285714% |
| Nov | 42°F | 31°F | 13 | 2.6in | 2.7h | 75.85714285714285% |
| Dec | 31°F | 19°F | 14 | 2.9in | 1.9h | 78.14285714285714% |
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Planning notes
Expect some rain.