SeasonMapNiagara Falls weather in September
Canada
September in Niagara Falls: nice, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Niagara Falls · #141 of 1383 destinations to visit in September · comfort 92/100 (tier S)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Niagara Falls in September
Notes from nearby Toronto (73 km away)
Niagara Falls doesn't have its own notes for September yet — these are about Toronto, close enough to share the season.
Toronto's September is a forum favourite: still warm but past the humid stretch, with a monthly high near 21°C easing to about 15 overnight and a hint of autumn in the evenings. Regulars split the month in two — early September is pleasant and quieter once children are back in school, while late September turns cool, crisp and often sunny. The one thing to plan around is cost rather than climate: the Toronto International Film Festival runs through the first half of the month and pushes hotel prices up.
Other months in Niagara Falls
Niagara Falls' forum rates June as a genuine sweet spot — summer weather without July and August's peak crowds, since Canadian schools are still in session for most of the month. Regulars note late June already runs into the high 70s°F, with shorts weather standard by then.
Add your own note from Niagara Falls's card on the map.
Niagara Falls climate normals — September
| Daytime high | 24°C / 74°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 56°F | |
| Feels like (high) | 23°C / 73°F | |
| Rainfall | 68 mm / 2.7 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 12.5 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Niagara Falls in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsSummer peak, Summer break in Canada(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Niagara Falls's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherNiagara Falls's best weather comes in May, June and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Niagara Falls in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Opening
Falls boat season
24 Apr – 30 Nov · usuallySummer season opensClosuresThe boats run from late April to the end of November and are the only way to get under the falls. Out of season the docks are dismantled and the wet alternative is the tunnels behind the sheet. Source ↗
- Season
Summer peak
25 Jun – 5 SepSchool holidaysCrowdedSchool holidays on both sides of the border land at once, and the queue for the boat runs an hour or more by midday. Go before nine or after six; the falls are floodlit every night anyway.
Nearby, and something's on
Within 300 km of Niagara Falls — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Niagara Falls?
Niagara Falls in September — FAQ
- Is September a good time to visit Niagara Falls?
- September in Niagara Falls: nice, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Niagara Falls on SeasonMap's comfort score (92/100).
- What is the weather like in Niagara Falls in September?
- In September, Niagara Falls averages a daily high of 23.5°C and a low of 13.5°C, with about 68 mm of rain over roughly 6.7 rainy days.
- What is the air quality in Niagara Falls in September?
- Niagara Falls has a mean US Air Quality Index of about 49 in September.
Other months in Niagara Falls
Compare Niagara Falls in September
Warmer or cooler than Niagara Falls in September
Similar destinations in North America — September
Within 300 km: Toronto's Nuit Blanche around 28 Sep – 6 Oct, and Cleveland's Cleveland National Air Show on 5–7 Sep.