September Weather in Whitehorse, Canada

Last updated: April 22, 2025

September in Whitehorse, Canada offers a fascinating blend of autumnal chill and vibrant seasonal changes. Average temperatures hover around a crisp 7°C (45°F), with highs reaching a pleasant 23°C (74°F) and lows dipping to a brisk -7°C (19°F). The month is characterized by 40 mm (1.6 in) of precipitation spread over approximately 10 days, contributing to the lush landscape. With humidity levels peaking at an impressive 95%, the air feels rich and invigorating, ideal for those who appreciate the refreshing bite of early fall. Experience the unique charm of Whitehorse as it transitions into autumn!

September Temperature in Whitehorse

As September rolls into Whitehorse, Canada, the temperatures begin to show a noticeable transition towards autumn. With minimums dipping to -7°C (19°F), the crispness of early fall is in the air, while the average hovers around 7°C (45°F)—a stark contrast to the sweltering summer months. The maximum temperatures still reach a comfortable 23°C (74°F), allowing for pleasantly warm days amidst the cool evenings. This month marks a gentle decline from the balmy late summer, creating a picturesque landscape as the leaves start their vibrant transformation. Overall, September encapsulates the beauty of seasonal change, balancing the remnants of warmth with the beckoning chill of winter that lies ahead.

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

The chart illustrates September temperature patterns in Whitehorse, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec331731455357544532149
Data source: Temperature data for Whitehorse generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Whitehorse

September in Whitehorse witnesses a moderate precipitation of 40 mm (1.6 in), marking a noticeable shift from the summer's wettest months. With 10 days of rain, September provides a balance between the abundant moisture of August and the drier conditions that follow in October. This transition reflects the tail end of the growing season, where rainfall begins to decline as the days shorten. Compared to other months, September's precipitation is significant but not excessive, hinting that while summer's lushness is fading, it still offers more moisture than many earlier months like April and May. As autumn approaches, the rhythmic cadence of rainfall sets the tone for the changing season in this northern landscape.

September Precipitation Trends in Whitehorse

The chart displays monthly precipitation patterns in Whitehorse, 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.
JanFebMarAprMayJunJulAugSepOctNovDec282728203360687340514047
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Whitehorse

In September, Whitehorse experiences a notable shift in humidity, with levels averaging around 95%. This places the month comfortably within the higher range of the year, following the peak of 98% in August. As summer transitions to autumn, the moisture in the air remains significant, reminiscent of the winter months where humidity levels rise again, hitting 99% in November. The trend reveals a steady decline from the sweltering summer, yet local residents can still expect a palpable sense of dampness as the cozy fall season begins to set in, bridging the hot months to the cold. This enduring humidity, particularly in September, underscores the region's unique climate rhythm, where the air remains thick with moisture even as fall approaches.

September Average Humidity in Whitehorse

This chart illustrates the average monthly humidity levels in Whitehorse, 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.
JanFebMarAprMayJunJulAugSepOctNovDec97%96%95%93%90%88%90%98%95%96%99%98%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Whitehorse

In September, Whitehorse experiences a moderate UV Index of 4, making it a perfect time for outdoor activities while still being mindful of sun exposure. As the summer fades, the UV levels drop from the peak of July, which reached a high 7, requiring only 25 minutes of sun exposure before burning. In contrast, May and June, also with high UV levels, ask for vigilant sun protection due to similar burn times. September's 30-minute burn time reflects a shift towards lower UV exposure, typical for the transition into autumn. As days grow shorter and temperatures cool, residents can enjoy the outdoors with a bit more safety from harmful UV rays. For more insights on UV trends throughout the year, visit Whitehorse UV Index.

Maximum UV Index Levels in Whitehorse for September

The chart shows the monthly maximum UV Index (UVI) for Whitehorse 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.
JanFebMarAprMayJunJulAugSepOctNovDec123466764211
Data source: Whitehorse 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 Whitehorse

As summer transitions into fall, September in Whitehorse, Canada, offers a beautiful blend of warmth and light with 228 hours of sunshine. This month continues the decline from the abundant hours of sunlight experienced in the peak summer months, witnessing a significant drop from August's robust 282 hours. The shift from the vibrant days of summer heralds the arrival of autumn, with daylight diminishing as we approach the colder months. This gradual change highlights the seasonal rhythm of Whitehorse, where each month brings its unique charm, and September stands as a gentle reminder of summer’s close, wrapped in its golden hues and cooler breezes.

Monthly Sunshine Duration in Whitehorse: September Highlighted

The September sunshine duration represents the total number of hours Whitehorse 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.
JanFebMarAprMayJunJulAugSepOctNovDec55h138h236h310h353h342h350h282h228h129h75h56h
Data source: Whitehorse September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Whitehorse During September

In Whitehorse, Canada, the likelihood of sunny weather in September stands at 22%, reflecting a slight dip as summer transitions into fall. This month typically experiences less sunshine compared to its warmer counterparts, with July peaking at 45% and August trailing at 26%. As autumn approaches, the dwindling chances of sun are consistent with the trends observed throughout the year, where early spring and late fall often bring cloudier skies. While September doesn’t boast the same sunny appeal as the summer months, it does offer a unique charm as the landscape begins to shift in preparation for winter.

Percentage of Sunny Days in September in Whitehorse

The chart illustrates the percentage of sunny days in Whitehorse 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 Whitehorse experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec24%41%24%47%16%36%45%26%22%25%21%19%
Data source: Whitehorse September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Whitehorse in September

As September arrives in Whitehorse, Canada, daylight begins to wane, offering a gentle transition from the vibrant summer months. With 12 hours of sunlight, the city experiences a noticeable reduction from the peak daylight of 18 hours seen in June and July. This gradual decline marks a shift towards autumn, following an expansive 17 hours of daylight in May. The early month still allows for plenty of outdoor activities, but as the days grow shorter, the crispness of fall starts to weave into the landscape. From the prolonged brightness of summer to the more subdued light of September, Whitehorse showcases the beautiful ebb and flow of daylight throughout the year, leading into the quieter, reflective months ahead.

Average Daylight Hours in Whitehorse for September

The chart illustrates the variation in daylight duration in Whitehorse throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec6h 38m9h 5m11h 53m14h 44m17h 25m18h 58m18h 4m15h 34m12h 46m9h 57m7h 18m5h 45m
Data source: Whitehorse daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Whitehorse

As September unfolds in Whitehorse, Canada, the average wind speed settles at a consistent 2.1 m/s (5 mph), reflecting a tranquil yet dynamic transition into autumn. This month typically mirrors the breezy conditions seen during the peak summer months of June and July, which also maintain a similar wind speed. Interestingly, September’s winds signal a gradual shift, as they begin to soften compared to the gustier springs of April and May, where winds reach 2.3 m/s (5 mph). This slight decrease, coupled with the impending chill of October, sets a serene backdrop for the vibrant fall colors. Overall, September serves as a gentle reminder of autumn’s approach, with winds weaving a soft, rhythmic breeze through the changing landscape.

Average September Wind Speed in Whitehorse

The chart displays monthly wind speed patterns in Whitehorse, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.01.72.12.32.32.12.12.22.1 m/s2.31.71.9
Data source: Whitehorse September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Whitehorse Compares to Other Months

The weather in Whitehorse 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 Whitehorse and find detailed weather information for every month.

In September, temperatures in Whitehorse range from a chilly minimum of -7°C (19°F) to a warm maximum of 23°C (74°F), with an average of 7°C (45°F). The month experiences about 40 mm (1.6 in) of precipitation spread over approximately 10 days, and humidity levels are high at 95%. In contrast, January is significantly colder, with temperatures plunging to a minimum of -46°C (-50°F) and an average of -16°C (3°F), peaking at just 3°C (38°F). Precipitation decreases to 28 mm (1.1 in) over 7 days, while humidity remains high at 97%. For more detailed information, check out Whitehorse weather in January.

September and February present stark contrasts in weather conditions. In September, temperatures range from a chilly -7°C (19°F) to a comfortable high of 23°C (74°F), with an average of 7°C (45°F). The month typically experiences 40 mm (1.6 in) of precipitation over about 10 days, all while maintaining a high humidity level of 95%. In contrast, February sees much harsher conditions, with temperatures plummeting to a minimum of -41°C (-41°F) and averaging -16°C (3°F), peaking at just 4°C (40°F). Precipitation drops to 27 mm (1.1 in) over approximately 6 days, but humidity remains at a notable 95%. For more details about February weather, you can explore Whitehorse weather in February.

In comparing the weather of September and March, we see notable differences in temperature and precipitation. September features a milder climate with average temperatures around 7°C (45°F), peaking at a maximum of 23°C (74°F), while March is significantly colder, with average temperatures plummeting to -8°C (17°F) and a maximum of only 12°C (55°F). Precipitation levels are relatively close, with September receiving 40 mm (1.6 in) across 10 days, compared to March's 28 mm (1.1 in) over 8 days. Both months feature high humidity levels of 95%, but the overall experience of March weather can be much harsher. For a closer look at March's climate specifics, you can check out this link: Whitehorse weather in March.

September and April present markedly different weather conditions. In September, temperatures range from a chilly -7°C (19°F) at night to a pleasant 23°C (74°F) during the day, with an average of 7°C (45°F). The month sees about 40 mm (1.6 in) of precipitation over approximately 10 days, accompanied by high humidity levels of 95%. In contrast, April experiences significantly colder weather, with temperatures dipping as low as -26°C (-15°F) and peaking at 15°C (60°F), averaging around -1°C (31°F). Precipitation is lighter in April, totaling about 20 mm (0.8 in) and occurring on just 6 days, with a slightly lower humidity at 93%. For more details on the weather specifics, you can visit Whitehorse weather in April.

In September, the weather begins to cool down, with temperatures ranging from a minimum of -7°C (19°F) to a maximum of 23°C (74°F), while the average temperature remains at 7°C (45°F). The month sees about 40 mm (1.6 in) of precipitation over 10 days, contributing to a high humidity level of 95%. In contrast, May experiences slightly milder conditions, with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 24°C (75°F), maintaining an average temperature similar to September at 7°C (45°F). May has lower precipitation at 33 mm (1.3 in) over 9 days and a reduced humidity level of 90%. For more detailed information, you can check Whitehorse weather in May.

In comparing the weather between September and June, notable differences in temperature and precipitation emerge. September experiences a broader range of temperatures, with a minimum of -7°C (19°F) and a maximum of 23°C (74°F), while June has milder conditions, ranging from a minimum of -1°C (31°F) to a maximum of 29°C (84°F). Precipitation is also higher in June, totaling 60 mm (2.4 in) over 13 days compared to September's 40 mm (1.6 in) over 10 days. Additionally, September boasts a higher humidity level at 95%, compared to June’s 88%. To explore June's weather in more detail, check out Whitehorse weather in June.

In comparing the weather between September and July, notable differences in temperature and precipitation are evident. September experiences cooler temperatures, with a minimum of -7°C (19°F) and an average of 7°C (45°F), peaking at 23°C (74°F). In contrast, July boasts warmer conditions, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 29°C (84°F), averaging 14°C (58°F). While September has 40 mm (1.6 inches) of precipitation over 10 days and high humidity at 95%, July sees higher precipitation levels at 68 mm (2.7 inches) across 13 days, with slightly lower humidity at 90%. For more information on the July weather, visit Whitehorse weather in July.

Comparing the weather between September and August, we can see notable differences in temperature and precipitation. September experiences a wider temperature range, with minimums dropping to -7°C (19°F) and maximums reaching 23°C (74°F), resulting in an average of 7°C (45°F). In contrast, August is generally warmer, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 28°C (84°F) and an average of 12°C (54°F). Additionally, September has a lower precipitation total of 40 mm (1.6 in) over 10 days compared to August's 73 mm (2.9 in) over 13 days. Both months are characterized by high humidity, with September at 95% and August slightly higher at 98%. For detailed information about August's climate, you can refer to Whitehorse weather in August.

September weather in Whitehorse is characterized by a significant temperature range, with minimums of -7°C (19°F) and maximums reaching up to 23°C (74°F). The month experiences an average temperature of around 7°C (45°F) and receives about 40 mm (1.6 in) of precipitation over 10 days, accompanied by high humidity levels of 95%.

In contrast, October brings cooler temperatures, with minimums dropping to -15°C (5°F) and a maximum of only 13°C (55°F), averaging around 0°C (33°F). This month also sees an increase in precipitation to 51 mm (2.0 in) over 11 days, and humidity rises slightly to 96%. For more detailed information, you can check out Whitehorse weather in October.

September and November exhibit stark contrasts in weather. In September, temperatures range from a minimum of -7°C (19°F) to a maximum of 23°C (74°F), with an average of 7°C (45°F). The month experiences about 40 mm (1.6 in) of precipitation over approximately 10 days, while humidity remains high at 95%. In contrast, November plunges into much colder conditions, featuring temperatures ranging from a chilling -34°C (-28°F) to a maximum of 7°C (45°F), and an average of -10°C (15°F). The precipitation remains similar at 39 mm (1.6 in) across 11 days, but humidity increases slightly to 99%. For more detailed insights into November weather, you can check Whitehorse weather in November.

September and December present stark contrasts in weather conditions. In September, temperatures range from a minimum of -7°C (19°F) to a comfortable maximum of 23°C (74°F), with an average of 7°C (45°F). The month experiences around 40 mm (1.6 in) of precipitation over 10 days, accompanied by high humidity at 95%. Conversely, December plunges into much colder temperatures, with lows of -37°C (-35°F) and an average of -13°C (9°F). The maximum temperature barely reaches 4°C (40°F), and precipitation increases slightly to 47 mm (1.9 in) over 11 days, while humidity creeps up to a chilly 97%. For more detailed information, you can check out Whitehorse weather in December.

Compare Whitehorse's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Whitehorse

As September unfolds in Whitehorse, the weather reflects a notable transition from the warmth of summer to the crispness of fall. Unlike the hotter months, September brings a cooler average temperature, with the daily ranges dipping significantly and hinting at the impending winter. While humidity remains high, the amount of precipitation increases, resulting in frequent rainy days that can dampen outdoor plans but also paint the landscape in lush autumn hues. This change in climate fosters a unique charm, making September a month of vibrant colors and refreshing breezes. For more detailed insights, explore the full picture of the city's weather patterns at Whitehorse Climate.