Weather in Whistler in September

A good month. September is a solid month to be in Whistler. Highs average 17.7 °C, lows 8.6 °C, and rain falls on 12 days — nothing in the month is working against you.

September ranks 3 of 12 in Whistler. Only July scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 12 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.7 °C days and 8.6 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest September day reached 32.8 °C and the coldest night fell to -0.6 °C, and the wettest single day dropped 51 mm — roughly 44% of the month's rain in one day.

September is moderately variable: 23 mm in the driest year against 212 mm in the wettest, around an average of 116 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 4.1 °C cooler than August, with October dropping another 7.3 °C. The first week and the last are not the same trip. Rain is the thing that moves: October brings 6 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

12.7 hours of daylight, losing 1.8 hours across the month. That is between Whistler's extremes of 16.4 and 8.1 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 28.6 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

September in Whistler versus nearby

If Whistler is one option among several, the nearby comparison is worth making. Vancouver is close enough to be a coin toss — 2.3 °C warmer, the same number of rain days. Maple Ridge is a better bet in September — 2.6 °C warmer, the same number of rain days.

So: September works, with July the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Whistler

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