Weather in Edmonton in September

Prime time. September is about as good as Edmonton gets. Highs average 17.6 °C, lows 5.7 °C, and rain falls on 8 days — nothing in the month is working against you.

September ranks 2 of 12 in Edmonton. Only August scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 8 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.6 °C days and 5.7 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 3 nights fall below freezing. Across the twenty years measured, the hottest September day reached 31.7 °C and the coldest night fell to -5.3 °C.

September is moderately variable: 8 mm in the driest year against 86 mm in the wettest, around an average of 41 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 9.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How September sits in the year

The month is on the way down: 5.2 °C cooler than August, with October dropping another 8.2 °C. The first week and the last are not the same trip.

Daylight in September

12.8 hours of daylight, losing 2.1 hours across the month. That is between Edmonton's extremes of 17 and 7.5 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 37.6 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Edmonton versus nearby

If Edmonton is one option among several, the nearby comparison is worth making. Calgary is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Banff is the weaker option in September — 2.3 °C cooler, 7 days more rain.

So: September is effectively as good as it gets here — 3 points behind August, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Edmonton

See all twelve months in Edmonton, or where else to go in September.