September Weather in Dunedin, United States

Last updated: February 24, 2025

September in Dunedin, United States, brings a blend of warm temperatures and considerable rainfall, making it a month of contrasts. With maximum highs reaching 32°C (89°F) and an average temperature of 27°C (82°F), the weather is predominantly warm and inviting. However, this warmth is tempered by humidity levels sitting at 78%, which can make the air feel quite steamy. Expect frequent showers, with a total precipitation of 135 mm (5.3 in) over 18 days, making an umbrella a wise companion. Overall, September is a time when Dunedin experiences the cusp of summer, punctuated by refreshing rain, perfect for those who enjoy the vibrant pulse of changing seasons.

September Temperature in Dunedin

In September, Dunedin experiences a subtle transition as the winter heat begins to wane, ushering in more temperate conditions. The minimum temperature hovers around 23°C (74°F), while the average high peaks at a warm 32°C (89°F). This month reflects a gradual decline from the sweltering summer days, making the overall average a comfortable 27°C (82°F). As daylight lingers, September's weather remains inviting, paving the way for the cooling autumn months ahead. With these pleasant temperatures, it's an ideal time to enjoy the outdoors before the notable dip in temperatures arrives in October.

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

The chart illustrates September temperature patterns in Dunedin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec616568727781828281787065
Data source: Temperature data for Dunedin 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 Dunedin

In September, Dunedin experiences a significant 135 mm (5.3 in) of precipitation, making it one of the wetter months of the year. Although it's less than the torrential August rains, which saw 221 mm (8.7 in) over 25 days, September maintains a steady flow of 18 rainy days, suggesting a persistent pattern of moisture as the region transitions into fall. The rainfall in September begins to taper off compared to the summer peak months, yet it remains crucial for nourishing the local landscape. This trend of higher precipitation during late summer followed by a gradual decrease will continue into fall, as October shows a marked drop to 71 mm (2.8 in). The overall pattern underscores Dunedin's shift from a humid summer to a cooler and drier autumn, highlighting the dynamic nature of its climate.

September Precipitation Trends in Dunedin

The chart displays monthly precipitation patterns in Dunedin, 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.
JanFebMarAprMayJunJulAugSepOctNovDec43572066103159210221135714771
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dunedin

As summer transitions to fall in Dunedin, September brings a noticeable shift in humidity, settling at 78%. This marks a slight increase from the dry summer months of July and August, both averaging 74% humidity. The trend is evident as the air begins to feel more humid, echoing the higher levels seen earlier in the year. The gradual rise in moisture levels continues into October and November, suggesting a return to the more humid conditions characteristic of the earlier months, where humidity peaks at 84% in December. Overall, September acts as a bridge from the drier summer heat towards the more humid fall and winter, inviting a comfortable yet moist atmospheric feel.

September Average Humidity in Dunedin

This chart illustrates the average monthly humidity levels in Dunedin, 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.
JanFebMarAprMayJunJulAugSepOctNovDec82%82%79%78%76%75%74%75%78%80%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Dunedin

As September unfolds in Dunedin, the UV Index remains at a striking 11, categorizing it as extreme and indicating a burn time of just 10 minutes without adequate protection. Following a summer of soaring values, this month continues the trend of elevated UV levels, consistent with the high readings seen from April through August. Although the index shows a slight dip from the previous months, the prevailing risk of skin damage persists, underscoring the importance of sun safety measures. It's crucial to remain vigilant and protective during outdoor activities in this sun-drenched locale. For more detailed insights, check out the full data at Dunedin UV Index.

Maximum UV Index Levels in Dunedin for September

The chart shows the monthly maximum UV Index (UVI) for Dunedin 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.
JanFebMarAprMayJunJulAugSepOctNovDec689111112121111975
Data source: Dunedin 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 Dunedin

As the summer days gradually slip away, September in Dunedin shines with a delightful 312 hours of sunshine, continuing the region's trend of abundant light. This month maintains a stronghold on warmth, nestled comfortably between the peak moments of sun seen earlier in the year, particularly in May, which boasts an impressive 337 hours. Following the summer’s glow, September stands as a gentle reminder of the beautiful transition into autumn. While the sunshine begins to taper off into October's 302 hours, the lingering warmth of September keeps the outdoor spirit alive, inviting residents and visitors alike to make the most of the splendid weather before the chill settles in.

Monthly Sunshine Duration in Dunedin: September Highlighted

The September sunshine duration represents the total number of hours Dunedin 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.
JanFebMarAprMayJunJulAugSepOctNovDec219h263h318h320h337h306h321h318h312h302h280h267h
Data source: Dunedin September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Dunedin During September

In Dunedin, United States, the likelihood of sunny weather in September shows a noticeable dip, with only 32% chance of sun. This percentage marks a decline from the sunnier months of late spring, where April peaks at 60% and May follows closely with 58%. As the summer months come to a close in August, we see a significant drop to just 17% chance of sun, setting the stage for a transitional September. While the likelihood of sunny days begins to rise again in October through November, with chances reaching 51% and 55% respectively, September presents a somewhat cloudy farewell to summer. Despite this, the anticipated return of sunny days in the following months offers a bright outlook after the September slump.

Percentage of Sunny Days in September in Dunedin

The chart illustrates the percentage of sunny days in Dunedin 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 Dunedin experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec37%49%53%60%58%18%22%17%32%51%55%56%
Data source: Dunedin September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Dunedin in September

As September unfolds in Dunedin, the daylight dances between the lingering warmth of summer and the gentle arrival of autumn. This month offers about 12 hours of daylight, a graceful transition from the 13 hours enjoyed during the peak summer months of May through August. The steady decrease in daylight culminates through the fall, highlighting nature's cycle as we move towards October, which sees a slight dip to 11 hours. Observing these changes not only marks the passage of time but also invites us to savor the softer light and changing colors that September brings, creating a perfect backdrop for outdoor activities and reflective moments.

Average Daylight Hours in Dunedin for September

The chart illustrates the variation in daylight duration in Dunedin throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 35m11h 12m12h12h 50m13h 32m13h 52m13h 41m13h 4m12h 16m11h 27m10h 44m10h 23m
Data source: Dunedin daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Dunedin

As summer transitions to autumn, September in Dunedin brings a noticeable dip in wind speed, averaging 3.5 m/s (8 mph). This gentle breeze contrasts with the bluster of earlier months, marking the calm before the seasonal shift. Throughout the year, the city experiences its peak winds in February with an average speed of 5.4 m/s (12 mph), while July and August settle into softer gusts around 3.9-4.2 m/s (9 mph). September’s tranquility signals a gradual decline that continues into December, hinting at the cozy stillness of winter. Overall, the data reveal a rhythmic ebb and flow of winds, painting a dynamic portrait of Dunedin's climate as the year unfolds.

Average September Wind Speed in Dunedin

The chart displays monthly wind speed patterns in Dunedin, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.95.45.05.05.14.23.94.23.5 m/s4.75.13.7
Data source: Dunedin September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Dunedin Compares to Other Months

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

In comparing the weather of September and January, it's clear that the two months present stark contrasts. September boasts warm temperatures with a minimum of 23°C (74°F) and an average of 27°C (82°F), peaking at 32°C (89°F). However, it also experiences significant rainfall, totaling 135 mm (5.3 in) across 18 days, accompanied by a humidity level of 78%. In contrast, January is much cooler, with temperatures ranging from a minimum of 2°C (36°F) to an average of 16°C (61°F) and a maximum of 24°C (75°F). Precipitation in January is considerably less, recording only 43 mm (1.7 in) over just 4 days, with a slightly higher humidity of 82%. This highlights a significant seasonal shift from the sultry, wet conditions of September to the mild and dry ambiance of January. For more details, you can check the information available at Dunedin weather in January.

September and February present a stark contrast in weather conditions. September sees warmer temperatures, with a minimum of 23°C (74°F) and an average of 27°C (82°F), peaking at 32°C (89°F). In contrast, February experiences much cooler temperatures, with a minimum of 8°C (47°F) and an average of 18°C (65°F), reaching a maximum of 25°C (78°F). Additionally, September is characterized by higher precipitation, receiving 135 mm (5.3 in) over 18 days, whereas February has significantly less rainfall, totaling 57 mm (2.2 in) across only 5 days. Both months exhibit high humidity, with February slightly higher at 82% compared to September's 78%. For more detailed insights, check out Dunedin weather in February.

In comparing the weather of September and March, September is noticeably warmer, with average temperatures ranging from a minimum of 23°C (74°F) to a maximum of 32°C (89°F) and an average of 27°C (82°F). In contrast, March experiences a cooler climate, with temperatures ranging from a low of 7°C (46°F) to a high of 26°C (79°F), averaging 20°C (68°F). Moreover, September sees significantly more precipitation, with 135 mm (5.3 in) falling over 18 days, whereas March is much drier with only 20 mm (0.8 in) over just 3 days. Interestingly, both months maintain a similar humidity level, around 78-79%. For more specific details, you can check Dunedin weather in March.

The weather in September is notably warmer and wetter compared to April. In September, the average temperature hovers around 27°C (82°F), with minimums of 23°C (74°F) and maximums reaching up to 32°C (89°F). This month also experiences significant rainfall, with 135 mm (5.3 in) of precipitation spread over 18 days, making it quite humid at 78%.

In contrast, April offers a more moderate climate, featuring average temperatures of 22°C (73°F) with a minimum of 12°C (54°F) and a maximum of 28°C (83°F). The month sees much less rain, totaling 66 mm (2.6 in) over only 7 days, while maintaining the same humidity level of 78%. For those interested in more detailed information, you can check Dunedin weather in April.

In comparing the weather of September and May, September typically experiences warmer temperatures, with a minimum of 23°C (74°F) and an average of 27°C (82°F), compared to May's minimum of 18°C (64°F) and average of 25°C (77°F). September also sees a higher maximum temperature, reaching up to 32°C (89°F), while May peaks at 30°C (86°F). However, September is marked by more frequent rainfall, with 135 mm (5.3 in) of precipitation over 18 days, while May has slightly less at 103 mm (4.0 in) over just 9 days. Humidity levels are comparable between the two months, with September at 78% and May slightly lower at 76%. For more detailed insights about the weather patterns in May, visit Dunedin weather in May.

When comparing the weather in September and June, both months exhibit similar temperature ranges, with minimums around 23°C (74°F), average temperatures of about 27°C (81-82°F), and maximums reaching 32°C (89°F). However, September tends to be slightly wetter, with 135 mm (5.3 in) of precipitation over 18 days, compared to June's 159 mm (6.3 in) across 19 days. Additionally, September has a marginally higher humidity level at 78% compared to June's 75%. For more detailed information on June weather, you can check Dunedin weather in June.

In comparing the weather between September and July, we find that both months experience high temperatures, with July slightly warmer on average at 28°C (82°F) compared to September's average of 27°C (81°F). However, the minimum temperature in September is marginally cooler, sitting at 23°C (74°F) versus July's 24°C (76°F). Rainfall is notably higher in July, with 210 mm (8.3 in) over 25 days, while September sees 135 mm (5.3 in) across 18 days. Additionally, September exhibits higher humidity levels at 78%, compared to July's 74%. For those interested in learning more about the weather patterns in July, you can visit Dunedin weather in July.

In September, the weather in Dunedin experiences a slight cooling trend compared to August, with minimum temperatures averaging 23°C (74°F) and maximums reaching 32°C (89°F). The average temperature in September is about 27°C (82°F), while August maintains a slightly warmer average of 28°C (83°F). Precipitation decreases significantly from August's 221 mm (8.7 in) over 25 days to September's 135 mm (5.3 in) over 18 days, contributing to a drier feel in the latter month. Additionally, September sees a modest increase in humidity at 78%, compared to 74% in August. For more details, you can check Dunedin weather in August.

In comparing the weather between September and October, September showcases warmer temperatures with a minimum of 23°C (74°F) and an average of 27°C (82°F), while October experiences cooler mornings with a minimum of 15°C (59°F), although the average temperature remains close at 26°C (78°F). Despite having slightly higher maximum temperatures in September at 32°C (89°F) compared to October’s 31°C (87°F), October benefits from significantly reduced precipitation, receiving only 71 mm (2.8 in) over about 10 days, compared to September’s 135 mm (5.3 in) over 18 days. Humidity levels remain similar, with September at 78% and October slightly higher at 79%. For a detailed look at weather conditions in October, visit Dunedin weather in October.

September and November weather in Dunedin showcase a notable shift in temperature and precipitation patterns. In September, the climate is warm, with minimum temperatures averaging 23°C (74°F) and maximums reaching up to 32°C (89°F), alongside significant rainfall of 135 mm (5.3 in) spread over 18 days. In contrast, November brings a cooler atmosphere, with minimum temperatures dropping to 11°C (52°F) and maximums averaging 28°C (82°F). Precipitation is also notably less in November, with only 46 mm (1.8 in) expected over six days, while humidity slightly rises to 82%. For more detailed information, you can check Dunedin weather in November.

In September, the weather is warm and humid, with average temperatures around 27°C (82°F) and highs reaching up to 32°C (89°F). This month experiences significant rainfall, with precipitation of 135 mm (5.3 in) spread over 18 days, contributing to a relatively high humidity level of 78%. In contrast, December brings a notable shift, with cooler temperatures averaging 18°C (65°F) and a maximum of 24°C (76°F). The month is considerably drier, receiving only 70 mm (2.8 in) of rainfall over just 6 days, and the humidity slightly increases to 84%. For more detailed insights, visit Dunedin weather in December.

Compare Dunedin's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Dunedin

As the vibrant month of September unfolds in Dunedin, it brings a noticeable shift in weather patterns compared to the sweltering summer months. The temperatures are comfortably warm, often making outdoor activities a delight, while the increased humidity adds a touch of tropical feel to the air. However, with 18 days of precipitation contributing to a total of 135 mm, September is undeniably one of the wetter months of the year, reminding residents and visitors alike of the need for a quick rain jacket. This blend of warmth and moisture creates a unique climate, differing significantly from the drier and hotter spells of July and August. For a deeper dive into the nuances of Dunedin's seasonal shifts, check out Dunedin Climate.