Weather in Kelowna in September

Prime time. If you get to pick your dates, September is the one. Highs average 23.8 °C, lows 10.1 °C, and rain falls on 9 days — nothing in the month is working against you.

September is the highest-scoring month of the twelve. The nearest rival is May, and the month at the other end of the year is December.

Rain on 9 days, 0 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 36.8 °C and the coldest night fell to 1.8 °C.

September is moderately variable: 7 mm in the driest year against 81 mm in the wettest, around an average of 33 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 1.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How September sits in the year

The month is on the way down: 5.9 °C cooler than August, with October dropping another 8.5 °C. The first week and the last are not the same trip.

Daylight in September

12.7 hours of daylight, losing 1.8 hours across the month. That is between Kelowna's extremes of 16.3 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 — 36.1 °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 Kelowna versus nearby

If Kelowna is one option among several, the nearby comparison is worth making. Maple Ridge is close enough to be a coin toss — 3.5 °C cooler, 3 days more rain. Whistler is the weaker option in September — 6.1 °C cooler, 3 days more rain.

So: September is the answer for Kelowna. If it is booked out or priced out, May is the next best thing at 5 points behind, and December is the month to keep off the shortlist.

Every month in Kelowna

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