Calgary in September
In September, Calgary averages 17°C (63°F) during the day and 6°C (42°F) at night, with around 13 days of rain (41 mm total).
ShoulderConditions are cool — bring a jacket for evenings. Plan for unsettled weather and bring rain gear.
September in Calgary is outside the typical sweet spot for sightseeing weather. It can still be a great time to visit if you have specific reasons (festivals, off-season pricing, etc.).
How September compares to the rest of the year in Calgary
September is in the middle of the year for warmth in Calgary (4th of 12) and moderately rainy compared to the rest of the year (8th of 12). Daytime temperature runs 7°C above the annual average (10°C). September runs 6°C cooler than August (23°C) and cools 7°C in October (10°C).
September sunrise & sunset in Calgary
Times shown for Calgary local time (America/Edmonton), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Calgary — September
Golden-hour and blue-hour windows for the 15th of September, in Calgary's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Calgary in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Calgary's popularity.
Crowds & pricing — September in Calgary
Calgary is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: comfortable tourism weather
Sun & mosquito risk — September in Calgary
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Calgary in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | -1°C / 30°F | -11°C / 12°F | 12 mm | 11 | — |
| February | -2°C / 28°F | -13°C / 8°F | 20 mm | 13 | — |
| March | 5°C / 40°F | -8°C / 18°F | 21 mm | 13 | — |
| April | 11°C / 51°F | -2°C / 28°F | 31 mm | 16 | — |
| May | 17°C / 62°F | 4°C / 39°F | 56 mm | 18 | — |
| June | 21°C / 69°F | 9°C / 48°F | 100 mm | 21 | — |
| July | 24°C / 74°F | 11°C / 52°F | 62 mm | 18 | — |
| August | 23°C / 73°F | 11°C / 51°F | 62 mm | 15 | — |
| September | 17°C / 63°F | 6°C / 42°F | 41 mm | 13 | — |
| October | 10°C / 51°F | 0°C / 31°F | 30 mm | 13 | — |
| November | 2°C / 36°F | -7°C / 19°F | 23 mm | 12 | — |
| December | -3°C / 27°F | -12°C / 10°F | 19 mm | 10 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Calgary in September →
Frequently asked questions
How hot is Calgary in September?
In September, Calgary averages a high of 17°C (63°F) and a low of 6°C (42°F) — generally mild and pleasant.
Does it rain a lot in Calgary in September?
September can be fairly wet in Calgary, with about 13 rainy days on average.
Is September a good time to visit Calgary?
September is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Calgary in September?
Pack a warm jacket and layers, plus a compact umbrella or rain jacket. See the full September packing list for Calgary for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.