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Penticton Weather in September
September is one of the excellent months to visit Penticton, with daytime temperatures of 20°C (68°F) and lows of 8°C (46°F) at night. Some rainfall is typical for this time of year.
Rainfall in Penticton in September
Expect around 7 days of rain based on historical data, with 42 mm (1.7 in) average. Rain days are few and the total is low, so this is a largely dry month. Any showers that do occur tend to be brief.
Temperature in Penticton in September
Penticton in September has excellent weather. Days reach 20°C (68°F) and nights cool to 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Penticton in September
Expect sunny days throughout the month, with an estimated 216 hours of sunshine. This makes it a pleasant time to visit Penticton.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Penticton Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
20°C (68°F)
Chance of Rain
23%
Precipitation
42 mm (1.7 in)
Rainy days
7 days
Humidity
42% *
Sunshine
216 hours *
Percentage Sunshine
56% *
* Data from: Kelowna, Canada (43 KM, 27 Miles).
Penticton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Penticton - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Penticton typically drop from around 24°C (75°F) at the start of September to approximately 20°C (68°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Penticton in September
Browse day-by-day weather records for Penticton spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Penticton historical weather extremes in September
Based on 50 years of weather observations in Penticton between 1976 and 2026, these are the recorded extremes.
- The hottest September day on record in Penticton reached 36°C (97°F) (September 2, 2022).
- The coldest September day was on September 29, 2019, with a maximum of 9°C (48°F).
- The lowest overnight temperature recorded in September was -2°C (28°F) (September 28, 1984).
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Penticton in September
For Penticton in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Penticton in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Camping5/10 -
Outdoor sports10/10
Penticton 3-Day Forecast
More climate data for Penticton
Temperature Rainfall Sunshine Humidity
See the full Penticton climate overview or explore weather in Canada.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
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