September Weather in Kelowna, Canada

Last updated: April 22, 2025

September in Kelowna, Canada, offers a delightful transition from summer's heat to the crispness of autumn. With maximum temperatures reaching up to 29°C (84°F) and an average of 14°C (57°F), the month boasts pleasant days that invite outdoor activities. However, cooler nights can dip to around 2°C (37°F), reminding residents of the impending seasonal shift. Rainfall is also part of the landscape, with 62 mm (2.4 in) of precipitation over 11 days, contributing to the region's lush scenery. Coupled with a humidity level of 74%, September's weather creates a unique blend of warmth and freshness, making it an intriguing time to experience the natural beauty of Kelowna.

September Temperature in Kelowna

September in Kelowna, Canada, marks a transition as summer gracefully hands off to autumn. With nighttime temperatures dropping to a cool 2°C (37°F), the days still hold onto warmth with an average high of 29°C (84°F). This comfortable warmth, coupled with an average of 14°C (57°F), makes the month ideal for outdoor activities and soaking in the vibrant fall foliage. As the temperatures start to decrease from the peak summer highs, September invites residents and visitors alike to enjoy the lingering sunshine and pleasant evenings, providing a perfect backdrop for harvest festivals and stunning vineyard tours in the region.

September Weather in Kelowna: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kelowna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec272534415157646657443730
Data source: Temperature data for Kelowna generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kelowna

In September, Kelowna experiences a noticeable uptick in precipitation, with 62 mm (2.4 in) falling over 11 days. This reflects a return to wetter conditions after the arid summer months, where July and August recorded their lowest totals of the year. As autumn approaches, the skies open up more frequently, signaling a shift from the drier heat of summer. The city's precipitation levels in September are comparable to those seen in earlier months, such as January and February, which also experience substantial rainfall. This trend hints at the impending transition to the wetter season ahead, making September a month of rejuvenation for the local landscape.

September Precipitation Trends in Kelowna

The chart displays monthly precipitation patterns in Kelowna, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec6562606048422313628310492
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kelowna

As summer fades into autumn, September in Kelowna brings a notable shift in humidity levels, dropping to 74%, the lowest of the year. This month marks the transition from the sweltering heat of summer, where humidity peaked at 75% in August, to the crisper air that characterizes the fall season. Following September, humidity levels see a rise again in October, returning to 85%, as the region prepares for winter's more damp conditions. Overall, the trend reveals a gradual decline in humidity from the beginning of summer through to early autumn, creating a comfortable and refreshing atmosphere in Kelowna as the leaves begin to change.

September Average Humidity in Kelowna

This chart illustrates the average monthly humidity levels in Kelowna, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec90%91%89%86%82%81%84%75%74%85%88%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kelowna

As summer fades into autumn, September in Kelowna presents a notable shift in UV Index, marking a transition from the intense summer sun. With a UV Index of 7, categorized as high, residents and visitors should remain vigilant, particularly when spending extended periods outdoors, with a burn time of 25 minutes. This slight decline from the peak UV levels of the summer months indicates a reduction in sun intensity, yet it still invites the need for sun protection. Understanding these trends helps optimize outdoor enjoyment while minimizing the risk of sunburn. For more information on UV levels throughout the year, visit Kelowna UV Index.

Maximum UV Index Levels in Kelowna for September

The chart shows the monthly maximum UV Index (UVI) for Kelowna in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec235689987421
Data source: Kelowna September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Kelowna

September in Kelowna, Canada, offers a delightful transition into autumn with an impressive 257 hours of sunshine, marking it as a fantastic time to embrace the outdoors. This month sits comfortably between the sun-drenched summer peak of 391 hours in July and the more subdued 189 hours of October. As the days gradually shorten, the warmth lingers, showcasing a beautiful blend of late summer vibes and early fall charm. The sunshine trend reveals a steady increase from winter's low of 92 hours in January, peaking in the heart of summer before tapering off, yet September retains enough brilliance to invite outdoor activities and scenic exploration. Whether hunting for the perfect view of the Okanagan Lake or enjoying a vineyard stroll, September’s radiant days make it a memorable time in Kelowna.

Monthly Sunshine Duration in Kelowna: September Highlighted

The September sunshine duration represents the total number of hours Kelowna experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec92h150h222h264h333h338h391h352h257h189h113h108h
Data source: Kelowna September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kelowna During September

As summer transitions into fall, September in Kelowna showcases a notable decline in sunny weather, with a 33% chance of sun. This reflects a shift from the peak brightness of July, which boasts an impressive 81% chance of sunshine. Interestingly, while September's likelihood of sunshine dips below summer levels, it still holds a certain charm as it precedes the cooler months, paralleling the 52% chance seen in June. This trend underscores the gradual fade of summer, hinting at the cozy, colorful days of autumn ahead while still offering occasional sunlit moments to bask in before fall fully sets in.

Percentage of Sunny Days in September in Kelowna

The chart illustrates the percentage of sunny days in Kelowna throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Kelowna experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%27%34%51%46%52%81%47%33%33%21%17%
Data source: Kelowna September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kelowna in September

As summer gives way to autumn, September in Kelowna experiences a notable change in daylight duration, with 12 hours of sunlight brightening the days. This shift marks a gradual decline from the peak of 16 hours in June, as the region transitions from the long, sun-soaked days of summer to the crispness of fall. Following the vibrant months of May and June, where daylight peaks, September still offers a generous amount of sunshine, creating a beautiful backdrop for harvests and outdoor activities. As daylight dwindles further into October, the rhythm of the seasons becomes increasingly pronounced, encouraging residents to savor every moment of the remaining sunlight before winter's shorter days settle in.

Average Daylight Hours in Kelowna for September

The chart illustrates the variation in daylight duration in Kelowna throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 38m10h 7m11h 56m13h 49m15h 26m16h 15m15h 47m14h 20m12h 32m10h 40m9h 1m8h 9m
Data source: Kelowna daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kelowna

As September unfolds in Kelowna, Canada, the breeze continues its gentle rhythm, averaging 1.6 m/s (4 mph)—a consistent companion throughout the year. This slight decline in wind speed from the summer months mirrors the tranquil transition into autumn, where the air retains a warm afterglow yet begins to hint at the crispness to come. Across the previous months, the wind's variability has remained minimal, fluctuating only slightly between 1.6 to 1.9 m/s (4 mph). As the landscape shifts and the leaves begin their vibrant transformation, the soft September wind offers a serene backdrop to the natural beauty of the region, inviting both locals and visitors to savor the season's tranquility.

Average September Wind Speed in Kelowna

The chart displays monthly wind speed patterns in Kelowna, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.61.91.91.91.71.81.71.71.6 m/s1.71.81.8
Data source: Kelowna September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kelowna Compares to Other Months

The weather in Kelowna changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Kelowna and find detailed weather information for every month.

September and January present strikingly different weather conditions. In September, temperatures can range from a chilly 2°C (37°F) to a warm 29°C (84°F), with an average of 14°C (57°F). The month sees about 62 mm (2.4 in) of precipitation over 11 days, accompanied by a humidity level of 74%. In contrast, January is much colder, with temperatures plunging to as low as -26°C (-15°F) and averaging -3°C (27°F), peaking at just 7°C (44°F). Precipitation slightly increases to 65 mm (2.6 in) over 13 days, and humidity rises to 90%. For a detailed look at what to expect, check out Kelowna weather in January.

September and February present strikingly different weather patterns. In September, temperatures range from a mild 2°C (37°F) to a comfortable maximum of 29°C (84°F), with an average of 14°C (57°F). The month sees about 62 mm (2.4 in) of precipitation spread over 11 days, accompanied by a moderate humidity level of 74%. In contrast, February is marked by much colder temperatures, with a minimum of -24°C (-12°F) and a maximum reaching only 9°C (48°F), averaging -4°C (25°F). Precipitation remains consistent at 62 mm (2.4 in), but occurs over a longer stretch of 14 days, contributing to a higher humidity of 91%. For more details on February weather, visit Kelowna weather in February.

When comparing the weather of September and March, we see notable differences in temperature and humidity. September boasts a mild range, with temperatures varying from a minimum of 2°C (37°F) to a maximum of 29°C (84°F), while March experiences much colder conditions, with a minimum of -24°C (-11°F) and a maximum of 18°C (64°F). Precipitation levels are somewhat similar, with September receiving 62 mm (2.4 in) across 11 days and March totaling 60 mm (2.3 in) over 13 days. However, March's higher humidity at 89% compared to September's 74% adds to the chill of the month. For a more detailed look at March weather patterns, check out Kelowna weather in March.

In comparing the weather of September and April, September offers a warmer climate with average temperatures ranging from 2°C (37°F) to a maximum of 29°C (84°F), while April's range is cooler, from -7°C (19°F) to a maximum of 23°C (73°F). Both months experience similar levels of precipitation, with September receiving 62 mm (2.4 in) over 11 days and April slightly less at 59 mm (2.3 in) over 13 days. Additionally, September has a lower humidity level of 74%, compared to April's higher humidity of 85%, creating a noticeably different feel in the air. For a more detailed look at April's weather, you can check out Kelowna weather in April.

When comparing the weather in September and May, there are notable differences in temperature and precipitation. September has a wider temperature range, with minimums of 2°C and maximums reaching up to 29°C, while May experiences slightly cooler temperatures, dipping to -1°C and peaking at 27°C. Although September averages a warmer 14°C, May has a higher average humidity of 82%, compared to September's 74%. In terms of precipitation, September receives more rain, with 62 mm over 11 days, compared to May's 48 mm over just 9 days. For a closer look at May weather specifics, you can check Kelowna weather in May.

In comparing the weather between September and June, we see distinct differences in temperature and humidity levels. September boasts a comfortable average temperature of 14°C (57°F), with maximum highs reaching up to 29°C (84°F), while June can soar to much hotter conditions, with maximum temperatures peaking at a sweltering 39°C (102°F). Both months experience a similar minimum temperature, though June records slightly higher at 3°C (37°F) compared to September's 2°C (37°F). Precipitation is more frequent in September, with rain occurring on 11 days and totaling 62 mm (2.4 in), while June sees less rainfall on 8 days, totaling 42 mm (1.7 in). Humidity also plays a role, with June's humidity at 81% while September remains slightly lower at 74%. For a more detailed look at June conditions, you can refer to Kelowna weather in June.

The weather in September is generally milder compared to July, with average temperatures ranging from a minimum of 2°C (37°F) to a maximum of 29°C (84°F), while July experiences warmer temperatures, averaging 6°C (44°F) to 34°C (94°F). Additionally, September tends to be slightly wetter, receiving 62 mm (2.4 in) of precipitation over 11 days, compared to July's 23 mm (0.9 in) over just 4 days. Humidity levels are also higher in July at 84%, compared to 74% in September, making July feel more humid despite being the warmer month. For more detailed information, you can check out the link: Kelowna weather in July.

September's weather shows a notable shift towards cooler temperatures compared to August. The average temperature drops from 19°C (66°F) in August to 14°C (57°F) in September, with minimums falling from 8°C (46°F) to 2°C (37°F). While August enjoys warmer highs of up to 34°C (94°F), September's maximum reaches only 29°C (84°F). Additionally, September experiences significantly more precipitation, with 62 mm (2.4 in) of rainfall over 11 days, compared to just 13 mm (0.5 in) over 4 days in August. Humidity remains relatively stable, at 74% in September and 75% in August. For more detailed information, you can check Kelowna weather in August.

September and October present a notable shift in weather patterns. In September, temperatures range from a minimum of 2°C (37°F) to a maximum of 29°C (84°F), with an average of 14°C (57°F), and the month sees 62 mm (2.4 in) of precipitation over 11 days. Humidity is relatively moderate at 74%. By contrast, October experiences much cooler temperatures, with a minimum of -9°C (16°F), a maximum of 22°C (72°F), and an average of 7°C (45°F). Precipitation increases to 82 mm (3.2 in) spread over 14 days, and humidity rises to 85%. This transition signifies the arrival of autumn, making October much cooler and wetter than September. For more details, visit Kelowna weather in October.

September and November present contrasting weather conditions. In September, temperatures can range from a pleasant minimum of 2°C (37°F) to a warm maximum of 29°C (84°F), accompanied by an average temperature of 14°C (57°F). The month experiences moderate rainfall of 62 mm (2.4 in) over about 11 days, with a relative humidity of 74%. In stark contrast, November sees much colder temperatures, dipping to a minimum of -12°C (10°F) and averaging just 3°C (37°F), with a maximum of 11°C (53°F). Precipitation increases significantly, totaling 104 mm (4.1 in) over 17 days, and humidity rises to 88%. This shift marks a clear transition toward winter conditions. For more detailed information, check out Kelowna weather in November.

September and December present stark contrasts in weather conditions. In September, temperatures range from a mild 2°C (37°F) at night to a warm 29°C (84°F) during the day, with an average of 14°C (57°F). The month sees approximately 62 mm (2.4 in) of precipitation over 11 days, accompanied by a humidity level of 74%. In contrast, December experiences significantly colder weather, with temperatures plummeting to a minimum of -25°C (-12°F) and a maximum of 12°C (54°F), averaging around -1°C (30°F). Precipitation increases to 92 mm (3.6 in) over 17 days, and humidity rises considerably to 93%. For more information, you can check Kelowna weather in December.

Compare Kelowna's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kelowna

As summer gracefully transitions into fall, September in Kelowna showcases a unique blend of warm days and cooler nights, setting it apart from the peaks of summer. With average temperatures hovering around a comfortable 14°C, the month feels warmer than October yet cooler than peak summer months. While the city experiences a fair bit of rainfall, totaling around 62 mm over about 11 days, this moisture nourishes the landscape and enhances the stunning fall colors. If you’re planning a visit, be prepared for a delightful mix of crisp mornings and pleasantly warm afternoons, making it an ideal time to explore the beauty of Kelowna. For more insights on weather patterns throughout the year, check out Kelowna Climate.