Weather in Prince George in September

A good month. September is a solid month to be in Prince George. Highs average 17.4 °C, lows 5.9 °C, and rain falls on 12 days — nothing in the month is working against you.

September ranks 4 of 12 in Prince George: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 12 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.4 °C days and 5.9 °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 32.4 °C and the coldest night fell to -5 °C, and the wettest single day dropped 31 mm — roughly 44% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 115 mm against 32 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 70 mm average is a reasonable planning figure, not a promise.

Wind is light at 0.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 75%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 5.5 °C cooler than August, with October dropping another 8.3 °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 Prince George's extremes of 17.1 and 7.4 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 34.5 °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 Prince George versus nearby

If Prince George is one option among several, the nearby comparison is worth making. Jasper is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Whistler is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: September works, with August the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Prince George

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