September Weather in Charlottetown, Canada

Last updated: April 22, 2025

In Charlottetown, Canada, September brings a delightful mix of warm and cool temperatures, with a maximum reaching a pleasant 27°C (82°F) and an average of 16°C (61°F). As the month unfolds, temperatures can dip to a minimum of 3°C (38°F), creating a vibrant transition into autumn. However, don't forget your umbrella; September sees 10 days of precipitation, accumulating to 96 mm (3.8 in), along with high humidity levels of 85% that add to the crisp, refreshing air. Whether you're exploring the scenic landscapes or enjoying the local culture, September offers a unique charm in Charlottetown.

September Temperature in Charlottetown

In September, Charlottetown, Canada begins to transition from the warmth of summer to the crispness of autumn. Average temperatures hover around a pleasant 16°C (61°F), making it an ideal time for outdoor activities. The month sees lows of 3°C (38°F), ensuring a refreshing start to the day, while daytime highs can reach up to 27°C (82°F), offering plenty of warmth. As the summer warmth gradually fades, September showcases a delightful balance of mild temperatures, allowing residents and visitors alike to enjoy the beautiful fall foliage and the charm of the city.

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

The chart illustrates September temperature patterns in Charlottetown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec232228394860676860503928
Data source: Temperature data for Charlottetown 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 Charlottetown

September in Charlottetown sees a notable uptick in precipitation, with 96 mm (3.8 in) falling over 10 days, making it one of the wetter months of the year. This trend reflects the transition into autumn, as rainfall increases following the drier summer months of July and August, which recorded just 68 mm and 73 mm respectively. Compared to other months, September's precipitation nearly matches June's peak of 97 mm (3.8 in). As daylight wanes, this uptick in rainfall sets the stage for the impending chill of autumn, signaling a shift in the natural rhythm of the Island's environment.

September Precipitation Trends in Charlottetown

The chart displays monthly precipitation patterns in Charlottetown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8193758588976873977713597
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Charlottetown

In September, Charlottetown experiences a humidity level of 85%, which reflects the relatively consistent patterns seen throughout the year. After the peak summer months, when humidity rises to an average of 87% in August, September marks a slight decline, maintaining a level that is similar to the preceding spring months. Interestingly, the humidity remains stable, oscillating between 84% and 86% from January through May. This consistency highlights the coastal city’s maritime climate, characterized by moist air and gentle breezes that shape its seasonal weather. As autumn approaches, residents can expect a pleasant balance of humidity that lends itself to the crisp, refreshing charm of Charlottetown's early fall.

September Average Humidity in Charlottetown

This chart illustrates the average monthly humidity levels in Charlottetown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%86%86%85%82%86%87%85%85%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Charlottetown

As summer gives way to autumn in Charlottetown, Canada, September brings a notable shift in sunshine intensity, with the UV Index dropping to 7, placing it in the high exposure category. This decrease from the height of summer's UV Index of 10 in June indicates a gradual reduction in sun strength, yet still requires caution, as the burn time decreases to 25 minutes. The transition from the very high levels of July and August serves as a reminder that even in early fall, UV rays can still pose a risk. To safeguard your skin during outdoor activities, be mindful of sun protection strategies as the season changes. For more detailed information, visit Charlottetown UV Index.

Maximum UV Index Levels in Charlottetown for September

The chart shows the monthly maximum UV Index (UVI) for Charlottetown 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.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887532
Data source: Charlottetown 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 Charlottetown

As summer transitions into fall, September in Charlottetown continues to bask in the warmth of sunshine, boasting an impressive 271 hours of sunlight. This marks a noticeable decline from the bright peak of August, which enjoys 351 hours. However, September still benefits from long, sunny days, allowing residents and visitors to savor the lingering warmth before the chill of autumn sets in. Following a gradual rise in hours since the start of the year, this month serves as a gentle reminder that while the days are growing shorter, the golden glow of summer is not quite ready to fade from the picturesque landscape of Prince Edward Island. Embracing the beauty of the season, Charlottetown welcomes ample sunshine in September, setting the stage for a stunning fall transition.

Monthly Sunshine Duration in Charlottetown: September Highlighted

The September sunshine duration represents the total number of hours Charlottetown 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.
JanFebMarAprMayJunJulAugSepOctNovDec98h170h228h243h295h329h341h351h271h220h143h123h
Data source: Charlottetown September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Charlottetown During September

In September, Charlottetown bids farewell to summer with a 41% chance of sunny days, making it one of the more favorable months for enjoying clear skies. As the transition to autumn begins, there's a noticeable trend of increased sunshine compared to the earlier months, such as January and April, which are significantly cloudier with chances as low as 16% and 28%, respectively. Interestingly, September's probabilities closely resemble those of late summer, like August, which holds a 44% chance of sun. This pattern suggests that while summer begins to wane, there’s still ample opportunity for residents and visitors alike to relish the remaining warmth and sunny spells before the cooler October weather takes over.

Percentage of Sunny Days in September in Charlottetown

The chart illustrates the percentage of sunny days in Charlottetown 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 Charlottetown experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec16%27%45%28%41%42%27%44%42%34%34%29%
Data source: Charlottetown September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Charlottetown in September

As summer wanes in Charlottetown, September brings a gradual retreat in daylight hours, offering a gentle transition towards autumn. With 12 hours of sunlight, this month sees a noticeable decrease from the peak of 15 hours in July and June, steering the island toward shorter days ahead. The lush brightness of summer begins to fade as September gives way to the crisp air and vibrant colors of fall, continuing the trend of diminishing daylight that started in August and will continue into October. This rhythmic cycle not only highlights the beauty of seasonal change but also invites residents and visitors alike to savor the lingering warmth of daylight before the darker months settle in.

Average Daylight Hours in Charlottetown for September

The chart illustrates the variation in daylight duration in Charlottetown throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 4m10h 20m11h 57m13h 35m14h 59m15h 42m15h 19m14h 4m12h 29m10h 51m9h 24m8h 39m
Data source: Charlottetown daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Charlottetown

As summer gives way to autumn, September in Charlottetown brings a welcomed shift in the breeze, with an average wind speed of 5.5 m/s (12 mph). This slight uptick from the quieter, warmer months of July and August, which saw winds at 4.7 m/s (11 mph) and 4.6 m/s (10 mph) respectively, hints at nature's anticipation of the changing season. Interestingly, September's winds are not as brisk as in the deeper winter months, where speeds generally spike, reaching 6.2 m/s (14 mph) in both January and December. This gradual wind increase mirrors the fading warmth of summer, setting the stage for the cooler days ahead while still allowing residents and visitors to enjoy the lingering warmth before the chill truly sets in.

Average September Wind Speed in Charlottetown

The chart displays monthly wind speed patterns in Charlottetown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.35.76.25.65.25.44.74.65.5 m/s4.55.86.2
Data source: Charlottetown September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Charlottetown Compares to Other Months

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

In September, the weather in Charlottetown is pleasantly mild, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 27°C (82°F) and an average of 16°C (61°F). The month experiences significant rainfall, totaling around 96 mm (3.8 in) over about 10 days, coupled with high humidity levels at 85%. In contrast, January brings a stark chill, with temperatures dipping as low as -20°C (-3°F) and averaging -5°C (23°F), peaking at 14°C (58°F). While January sees slightly less precipitation at 81 mm (3.2 in) over the same number of days, the humidity remains high at 84%, creating a frigid atmosphere. For more detailed information, check out Charlottetown weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures range from a mild 3°C (38°F) at night to a warm 27°C (82°F) during the day, with an average of 16°C (61°F). The month sees about 96 mm (3.8 in) of precipitation over 10 days, accompanied by high humidity at 85%. In contrast, February experiences frigid temperatures, with lows dipping to -20°C (-4°F) and highs reaching only 9°C (49°F), averaging -5°C (22°F). Precipitation remains similar, at 93 mm (3.7 in) over 12 days, but the humidity slightly drops to 84%. For more details on the weather specifics, you can check Charlottetown weather in February.

September and March present contrasting weather experiences. In September, temperatures range from a minimum of 3°C (38°F) to a pleasant average of 16°C (61°F), peaking at 27°C (82°F). The month sees about 96 mm of precipitation over 10 days, with humidity around 85%, creating a humid yet warm early fall atmosphere. In contrast, March brings much colder conditions, with temperatures dipping as low as -19°C (-2°F) and averaging a brisk -2°C (28°F), only reaching a maximum of 11°C (53°F). Precipitation in March is slightly lower at 75 mm over 13 days, coupled with a humidity level of 86%, resulting in a chilly and damp finish to winter. For a detailed look at March weather in Charlottetown, you can visit Charlottetown weather in March.

When comparing the weather in September and April, notable differences emerge in both temperature and precipitation. September generally offers a milder climate, with average temperatures ranging from 3°C (38°F) to 27°C (82°F), while April is cooler, featuring temperatures from -8°C (18°F) to 18°C (65°F). Although both months experience significant precipitation, September has a slightly higher total of 96 mm (3.8 in) over about 10 days compared to April's 85 mm (3.4 in) across 12 days. Humidity levels are quite similar, with September at 85% and April slightly higher at 86%. For more details about April weather specifically, you can visit Charlottetown weather in April.

In comparing the weather of September and May, September showcases a milder climate with average temperatures peaking at 16°C (61°F) and maximums reaching up to 27°C (82°F). This month experiences more warmth and slightly higher precipitation of 96 mm (3.8 in) over 10 days, maintaining a consistent humidity level of 85%. On the other hand, May is characterized by cooler temperatures with an average of 9°C (49°F) and a maximum of 24°C (76°F). Although it receives slightly less rainfall at 88 mm (3.5 in) over 13 days, its minimum temperature can drop to -3°C (27°F). Both months share the same humidity level, but September offers a more comfortable warmth compared to the cooler May. For more information, visit Charlottetown weather in May.

In comparison to September, June offers a slightly cooler temperature range with minimums dipping to 0°C (33°F) and averages around 15°C (60°F). While both months experience similar levels of precipitation—September seeing 96 mm (3.8 in) over 10 days and June slightly higher at 97 mm (3.8 in) over 12 days—the humidity is marginally lower in June at 82% compared to September's 85%. Notably, June has a maximum temperature reaching 29°C (84°F), just slightly higher than September's peak of 27°C (82°F). For more detailed insights on June weather, you can refer to Charlottetown weather in June.

When comparing the weather in September to that in July, notable differences emerge. September experiences cooler temperatures, with a minimum of 3°C (38°F) and an average of 16°C (61°F), while July offers more warmth, featuring a minimum of 11°C (52°F) and an average of 20°C (67°F). Additionally, July typically peaks at 30°C (85°F), whereas September's maximum temperature reaches 27°C (82°F). Precipitation is more abundant in September, totaling 96 mm (3.8 in) over 10 days, compared to July's 68 mm (2.7 in) during the same number of days. Humidity levels are quite similar in both months, hovering around 85% in September and slightly higher at 86% in July. For a detailed look at July weather, you can check Charlottetown weather in July.

In comparing the weather between August and September, we see a notable shift in temperatures and precipitation patterns. August typically experiences milder conditions with average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 30°C (86°F), and slightly less precipitation at 73 mm (2.9 in) over 10 days. The humidity remains relatively high at 87%. In contrast, September brings cooler temperatures, featuring a minimum of 3°C (38°F) and a maximum of 27°C (82°F), alongside increased precipitation totaling 96 mm (3.8 in) over the same number of days, with humidity slightly lower at 85%. For more details on August's climate, you can visit Charlottetown weather in August.

September and October present a noticeable transition in weather patterns. September enjoys warmer temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 27°C (82°F), while October sees a drop with temperatures fluctuating between -2°C (29°F) and 24°C (75°F). Precipitation is relatively similar, with September receiving 96 mm over 10 days and October recording 77 mm over 11 days, but both months feature high humidity at 85%. As nature shifts gears, October brings a cooler edge to the air, making it an ideal time for cozy sweaters and autumnal activities. For more details on the weather in October, visit Charlottetown weather in October.

In comparing the weather of September and November, we can observe significant differences in temperature and precipitation. September boasts a milder temperature range with a minimum of 3°C (38°F) and an average high of 27°C (82°F), making it feel much warmer overall. In contrast, November sees much cooler temperatures, with a minimum of -12°C (10°F) and an average high of only 20°C (68°F). Rainfall also increases by November, with 135 mm (5.3 in) of precipitation over 15 days, compared to September's 96 mm (3.8 in) over 10 days. Both months maintain a humidity level of 85%, but the colder November weather makes it feel more biting. For more details, you can check out the Charlottetown weather in November.

September and December present starkly contrasting weather conditions. In September, temperatures range from a mild 3°C (38°F) at night to a warm average of 16°C (61°F) during the day, peaking at 27°C (82°F). This month experiences a fair amount of rainfall, totaling 96 mm (3.8 in) over approximately 10 days, coupled with high humidity at 85%. In contrast, December plunges temperatures significantly, with lows dropping to a frigid -19°C (-3°F) and an average of -2°C (29°F), reaching a maximum of 14°C (58°F). Precipitation remains similar at 97 mm (3.8 in), but it spreads over 13 days, while humidity slightly decreases to 84%. For more details on December weather in Charlottetown, visit Charlottetown weather in December.

Compare Charlottetown's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Charlottetown

As summer fades, September in Charlottetown offers a refreshing transition with mild temperatures, generally cooler than the heights of July and August. With average temperatures hovering around a comfortable 16°C, this month presents a welcoming contrast to the sweltering heat of summer, although chilly nights remind us that autumn is on the horizon. Visitors can expect increased rainfall, with roughly ten days of precipitation, adding a touch of crispness to the air and lushness to the scenery. The high humidity levels can create a unique atmosphere, making the occasional sunny day feel even more pleasant. For a deeper dive into what to expect throughout the year, check out Charlottetown Climate.