September Weather in Nanaimo, Canada

Last updated: April 22, 2025

In Nanaimo, Canada, September unveils a pleasant transition into autumn, characterized by a maximum temperature reaching 25°C (78°F), while the average settles at a comfortable 15°C (60°F). As the month progresses, nighttime temperatures gently dip to a minimum of 9°C (49°F). Despite the warmth, residents can expect regular precipitation, with a total of 158 mm (6.2 in) spread over 13 days, contributing to the region's lush landscapes. The air maintains a humidity level of 76%, adding to the crisp and refreshing atmosphere that marks this picturesque month in Nanaimo.

September Temperature in Nanaimo

In September, Nanaimo experiences a delightful transition as summer begins to wane. With minimum temperatures around 9°C (49°F) and averaging about 15°C (60°F), the weather remains pleasantly mild for outdoor activities. The maximum temperatures can reach up to 25°C (78°F), offering a last taste of summer warmth. This month marks a noticeable drop from the soaring summer highs seen in July and August, yet still holds onto a comfortable charm that invites locals and visitors alike to enjoy the beautiful landscapes. As the leaves start to change, September in Nanaimo presents a perfect blend of cozy sweater weather and vibrant autumn hues.

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

The chart illustrates September temperature patterns in Nanaimo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec403842475459646659504540
Data source: Temperature data for Nanaimo 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 Nanaimo

September in Nanaimo typically marks a noticeable increase in rainfall, with precipitation reaching 158 mm (6.2 in) over an average of 13 rainy days. This uptick in moisture is part of the transition into fall, following the relatively dry summer months of July and August. The total precipitation for September is significantly higher than both July and August, reflecting a shift as the landscape prepares for the wetter months ahead. As temperatures begin to cool, the increase in precipitation sets the stage for the much rainier October and November, when Nanaimo often experiences its peak rainfall. Overall, September serves as a reminder of the changing seasons, bringing essential moisture to the region after the drier summer spell.

September Precipitation Trends in Nanaimo

The chart displays monthly precipitation patterns in Nanaimo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec24914713612670703340158194304252
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nanaimo

In Nanaimo, Canada, September marks a shift towards more comfortable conditions, with humidity dipping to 76%. This is a notable decline from the summer months, where August recorded 77%. The trend reflects a gradual decrease in moisture levels as the city transitions from the warm embrace of summer into the cooler embrace of autumn. Interestingly, the humidity remains relatively consistent at higher levels throughout the winter and early spring, peaking at 86% in January through April, before tapering off in the summer. As October approaches, humidity climbs once again to 88%, suggesting that while September provides a brief respite, the coastal climate will soon return to its characteristic moisture.

September Average Humidity in Nanaimo

This chart illustrates the average monthly humidity levels in Nanaimo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%86%86%81%83%84%77%76%88%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nanaimo

As September unfolds in Nanaimo, the UV Index reflects a transition toward moderation with a value of 6, categorizing sun exposure as high. This indicates that while it's still crucial to protect your skin, the burn time of 25 minutes offers a slight reprieve compared to the intense summer months. After experiencing the very high levels of UV in July and August, residents will appreciate the easing of the intensity. Looking back, the UV Index trends reveal a steady increase from the low levels observed in January, peaking in the height of summer before tapering off. As you enjoy the crisp September days, be sure to stay informed about the UV Index to keep your skin health in check. For detailed information, visit Nanaimo UV Index.

Maximum UV Index Levels in Nanaimo for September

The chart shows the monthly maximum UV Index (UVI) for Nanaimo 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.
JanFebMarAprMayJunJulAugSepOctNovDec234689986421
Data source: Nanaimo 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 Nanaimo

In Nanaimo, Canada, September brings a delightful transition as it basks in an impressive 241 hours of sunshine, marking a substantial carryover from the sun-drenched summer months. Following the peak brightness of July and August, which boast an exuberant 378 and 339 hours respectively, September still manages to deliver a vibrant glow, perfect for enjoying the early fall beauty. This month reflects a notable drop compared to the summer, yet it remains significantly brighter than the darker depths of winter; for instance, both October and November see a steep decline to 173 and 110 hours of sunshine. Thus, September serves as a gentle reminder of the sun's waning presence, encouraging residents and visitors alike to soak in the warm, golden hues before the clouds take over for the chilly season ahead.

Monthly Sunshine Duration in Nanaimo: September Highlighted

The September sunshine duration represents the total number of hours Nanaimo 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.
JanFebMarAprMayJunJulAugSepOctNovDec72h133h197h228h320h329h378h339h241h173h110h88h
Data source: Nanaimo September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Nanaimo During September

As summer draws to a close, September in Nanaimo, Canada, offers a modest chance of sunny weather at 31%. While this percentage illustrates a notable dip from the warm and sunny July and August, it remains stronger than the overcast months that follow, such as October and November. The trend indicates that while September is still capable of delivering pleasant days, residents and visitors alike should brace for variability, as the sunshine becomes less frequent, making way for the rainier autumn season. Embrace the lingering warmth while it lasts!

Percentage of Sunny Days in September in Nanaimo

The chart illustrates the percentage of sunny days in Nanaimo 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 Nanaimo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%26%29%56%40%53%72%56%31%24%18%21%
Data source: Nanaimo September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Nanaimo in September

As summer fades into fall, September in Nanaimo offers a gentle transition with about 12 hours of daylight. This month marks a noticeable decline from the long, sun-soaked days of summer, where June peaked at an impressive 16 hours. While daylight gradually diminishes from peak summer levels, September still holds onto some brightness, outlasting the shorter days of October, which drop to 10 hours. This gradual reduction sets the stage for the cozy ambiance of autumn, with nature's vibrant colors against a backdrop of softening light, inviting residents to savor the changing season before winter's early nights take hold.

Average Daylight Hours in Nanaimo for September

The chart illustrates the variation in daylight duration in Nanaimo throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 43m10h 10m11h 56m13h 46m15h 20m16h 8m15h 41m14h 16m12h 31m10h 42m9h 6m8h 15m
Data source: Nanaimo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Nanaimo

As September arrives in Nanaimo, a gentle shift in the air marks a transition from the serene summer breezes to a slightly brisker ambiance. With an average wind speed of 3.2 m/s (7 mph), September is a refreshing prelude to autumn, a notable increase from the subdued winds of July and August, which hovered around 2.5 to 2.7 m/s. This subtle uptick hints at the seasonal change that lies ahead, bridging the calm of summer with the invigorating gusts of fall. As the month progresses and nature begins to transform, residents and visitors can enjoy the invigorating winds that playfully dance through the trees, signaling that a new season is just around the corner.

Average September Wind Speed in Nanaimo

The chart displays monthly wind speed patterns in Nanaimo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.04.03.12.82.92.52.73.2 m/s4.24.53.9
Data source: Nanaimo September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Nanaimo Compares to Other Months

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

September and January in Nanaimo present contrasting weather conditions. September typically enjoys milder temperatures, ranging from a minimum of 9°C (49°F) to a maximum of 25°C (78°F), with an average of 15°C (60°F). This month also experiences relatively lower precipitation, totaling around 158 mm (6.2 in) over approximately 13 days, paired with a humidity level of 76%. In contrast, January brings much colder weather, with temperatures ranging from a low of -5°C (23°F) to a high of 9°C (49°F), and an average of only 4°C (40°F). Precipitation rises to 249 mm (9.8 in) over 17 days, along with a higher humidity of 86%. For a detailed look at January weather, visit Nanaimo weather in January.

September and February present notably different weather patterns. In September, temperatures range from a mild minimum of 9°C (49°F) to a warm maximum of 25°C (78°F), with an average of 15°C (60°F). This month experiences significant rainfall, totaling 158 mm (6.2 in) over approximately 13 days, accompanied by a humidity level of 76%. Conversely, February is much colder, with temperatures peaking at a maximum of only 9°C (49°F) and dipping as low as -5°C (23°F). Despite slightly lower total precipitation of 147 mm (5.8 in), rain falls on around 16 days, and humidity is slightly higher at 85%. For more detailed insights about February weather, you can refer to Nanaimo weather in February.

When comparing the weather in September and March, notable differences emerge. September boasts milder temperatures, with a minimum of 9°C (49°F) and a pleasant average of 15°C (60°F), reaching up to 25°C (78°F) at times. In contrast, March experiences much cooler conditions, with temperatures ranging from a minimum of -1°C (30°F) to an average of 6°C (42°F), peaking at only 15°C (59°F). Precipitation levels are fairly close, with September receiving 158 mm (6.2 in) over 13 days, while March sees 136 mm (5.3 in) spread across 15 days. Furthermore, March is characterized by higher humidity at 86%, compared to September's 76%. For more detailed information, you can refer to Nanaimo weather in March.

When comparing the weather in September and April, September typically showcases milder temperatures, with averages ranging from a minimum of 9°C (49°F) to a maximum of 25°C (78°F), while April is cooler, featuring a range from 2°C (36°F) to a maximum of 18°C (65°F). Although both months experience a fair amount of precipitation, September receives slightly more at 158 mm (6.2 in) over 13 days, compared to April's 126 mm (5.0 in) over 15 days. Humidity levels are also notable; September has a humidity of 76%, whereas April is generally more humid at 86%. For a detailed look at April's weather specifics, visit Nanaimo weather in April.

When comparing the weather in September and May, September tends to be warmer with average temperatures ranging from a minimum of 9°C (49°F) to a maximum of 25°C (78°F), while May has cooler temperatures, with a minimum of 4°C (40°F) and a maximum of 22°C (71°F). Precipitation is more frequent in September, with 158 mm (6.2 in) spread over 13 days compared to May’s 70 mm (2.7 in) over just 11 days. Humidity levels are slightly higher in May at 81%, compared to September's 76%. For more details on the specific weather patterns during this time, you can visit Nanaimo weather in May.

In comparing the weather of September and June, both months exhibit a similar average temperature, hovering around 15°C (60°F). However, June boasts warmer maximum temperatures, reaching up to 30°C (86°F), compared to September's peak of 25°C (78°F). Rainfall is notably different between the two months; September receives significantly more precipitation, with 158 mm (6.2 in) over 13 days, while June has less rain at 70 mm (2.8 in) across 12 days. Additionally, June tends to have slightly higher humidity at 83%, compared to September's 76%. For more detailed insights on June weather, you can refer to Nanaimo weather in June.

When comparing the weather in September to that in July, September tends to be cooler and wetter. September features minimal temperatures around 9°C (49°F) with an average of 15°C (60°F) and a maximum of 25°C (78°F). In contrast, July has slightly higher temperatures, with a minimum of 11°C (53°F), an average of 18°C (65°F), and a maximum of 27°C (81°F). Additionally, September experiences significantly more rainfall, receiving 158 mm (6.2 in) over 13 days, while July has only 33 mm (1.3 in) across 6 days. Humidity levels are also higher in July at 84%, compared to 76% in September. More details can be found in this link: Nanaimo weather in July.

In comparing the weather between September and August, it is clear that September tends to be cooler and wetter. September's minimum temperature drops to 9°C (49°F), with an average of 15°C (60°F) and a maximum of 25°C (78°F), whereas August experiences a milder range with a minimum of 12°C (54°F), an average of 19°C (66°F), and a maximum of 27°C (81°F). Additionally, September sees significantly higher precipitation, totaling 158 mm (6.2 in) over 13 days compared to August's 40 mm (1.6 in) over just 5 days. Humidity levels are comparable, with September at 76% and August at 77%. For more details on the weather patterns, you can visit Nanaimo weather in August.

September typically sees milder temperatures, with a minimum of 9°C (49°F) and an average of 15°C (60°F), peaking at a comfortable 25°C (78°F). In contrast, October brings a noticeable drop, featuring a minimum of 3°C (37°F) and an average of 10°C (50°F), with a maximum of only 19°C (67°F). Additionally, October experiences increased precipitation, with 194 mm (7.6 in) of rain over 16 days and higher humidity at 88%, compared to September's 158 mm (6.2 in) over 13 days and humidity of 76%. For more detailed information, you can check Nanaimo weather in October.

The weather in September presents a more moderate climate compared to November, with temperatures ranging from a minimum of 9°C (49°F) to a maximum of 25°C (78°F) and an average of 15°C (60°F). In contrast, November sees much cooler temperatures, with a minimum of 1°C (33°F) and a maximum of only 12°C (55°F), resulting in an average of just 7°C (45°F). Additionally, September experiences less precipitation at 158 mm (6.2 in) over 13 days, while November brings significantly increased rainfall, totaling 304 mm (12.0 in) across 18 days. The humidity also rises in November, reaching 87%, compared to September's 76%. For more detailed insights, check out Nanaimo weather in November.

September and December present striking contrasts in weather patterns. In September, temperatures range from a mild 9°C (49°F) to a warm 25°C (78°F), with an average of 15°C (60°F). The month experiences significant rainfall, totaling 158 mm (6.2 in) across approximately 13 days, and humidity levels sit at 76%. In stark contrast, December sees a substantial drop in temperatures, with a minimum of -7°C (20°F), an average of 4°C (40°F), and a maximum of only 10°C (50°F). Precipitation increases to 252 mm (9.9 in) over 20 days, and humidity rises to 87%. For more detailed information about December conditions, visit Nanaimo weather in December.

Compare Nanaimo's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Nanaimo

As summer gives way to autumn, September in Nanaimo showcases a shift in weather characterized by cooler temperatures and increased rainfall. The average temperature drops, bringing a refreshing change after the warmth of August, while precipitation levels rise significantly, with rain appearing on about half the days of the month. With humidity levels lingering around 76%, September can feel quite different compared to the drier summer months. This transitional period not only ushers in a cozy atmosphere but also paves the way for the vibrant fall colors that will soon commence. For a deeper dive into Nanaimo's weather patterns, visit Nanaimo Climate.