Last updated: August 31, 2025
In Hermanus, South Africa, September ushers in a delightful transition season, characterized by a maximum temperature of 28°C (83°F), providing warm days perfect for outdoor exploration. The average temperature hovers around a comfortable 15°C (59°F), while cooler nights dip to a minimum of 9°C (48°F), enabling cozy evenings. With 46 mm (1.8 in) of precipitation spread over 8 days, the month brings refreshing showers that nourish the lush landscapes. The humidity level at 76% adds to the invigorating coastal atmosphere, making September an ideal time to enjoy the natural beauty and vibrant marine life of this exquisite region.
As September arrives in Hermanus, South Africa, the transition into spring becomes beautifully evident. With minimum temperatures lingering around 9°C (48°F) and average highs reaching a comfortable 28°C (83°F), the month showcases a delightful range that marks the shift from winter's chill. This period brings an average temperature of 15°C (59°F), setting the stage for pleasant outdoor activities. Compared to the preceding months, September enjoys a notable rise, not just in daytime warmth but also in the overall vibrancy of the landscape. The milder nights provide a refreshing touch, making this time of year perfect for enjoying the stunning coastal views and the budding flora. Overall, September serves as a gentle reminder of the warmth and beauty that lie ahead in the southern spring.
In September, Hermanus experiences a moderate precipitation shift, receiving 46 mm (1.8 in) of rainfall over approximately 8 days. This marks a decrease from the wetter months of July and August, where the region was graced with 80 mm and 77 mm respectively. While September's rainfall is a welcome transition from the winter chill, it's essential to note that it still reflects a significant amount compared to the drier summer months ahead. As the region moves into October, precipitation levels remain relatively stable, hinting at a gradual shift as it gears up for the warmer seasons. Overall, September serves as a bridge between the heavy winter rains and the calmer climate of late spring.
In September, Hermanus experiences a slight dip in humidity, reaching 76%, which marks the tail end of the cooler months. This minor decrease reflects a broader trend of fluctuating humidity levels throughout the year, where the highest readings occur from February to April. Warm summer months typically see humidity rise to around 80%, while the autumn months gradually bring levels down closer to the mid-70s. Notably, this month's humidity is slightly lower than the 77% average observed in both August and October, hinting at the subtle transitions that define the coastal climate in this charming South African town.
As September arrives in Hermanus, South Africa, the UV Index stands at a notable 9, categorizing it as very high with a burn time of just 15 minutes. This marks a transition from the milder summer months, as the UV Index gradually declines from the extreme levels seen in January through March, where values soared to 14. The trend reveals that while the intensity lessens slightly in autumn, the need for sun protection remains crucial. With October ushering in another rise to 11, it’s a reminder to be vigilant about sun safety during this time of year. For more detailed information on UV conditions throughout the year, visit Hermanus UV Index.
UV Risk Categories
September brings a lovely transition in Hermanus, South Africa, where residents and visitors can bask in 328 hours of sunshine. This month stands out with a delightful amount of sunlight, nestled comfortably between the tail end of winter and the approach of the vibrant spring season. Notably, sunshine hours show a gradual climb from the winter months, reflecting a steady increase from 267 hours in June to 328 hours in September. As the days grow longer and warmer, the promise of October's generous 372 hours hints at even more sunshine to come, setting the stage for the stunning landscapes and outdoor adventures that Hermanus is famous for.
September in Hermanus, South Africa, ushers in the start of spring, and while the chance of sunny weather is fairly balanced at 51%, it reflects a subtle upward trend as the region shakes off the winter chill. This slight increase from the cooler months of August (52%) marks a shift toward brighter days ahead. Historically, September's sun probability stands on par with October, suggesting that the coastal charm of Hermanus is poised to attract sunshine lovers. As the month progresses, the chances for sunny skies will likely become even more promising, hinting at the delightful days that lie just around the corner.
As summer gradually gives way to autumn in Hermanus, South Africa, September marks a pivotal transition with an average daylight duration of 11 hours. Following a peak of 14 hours in January, daylight hours steadily diminish until they hit a low of 9 hours in June, only to slowly begin their ascent again. September's daylight hours not only provide a reprieve from the winter darkness but also herald the arrival of longer days in spring. The trend reveals a rhythmic ebb and flow of sunlight throughout the year, with September serving as a gentle reminder of the brighter days to come in October and November, where daylight stretches to 12 and 13 hours, respectively.
As September unfolds in Hermanus, South Africa, the coastal winds begin to pick up, averaging 5.2 m/s (12 mph). This wind speed mirrors the breezy conditions of the preceding month, where August also saw a gentle 4.6 m/s (10 mph), signaling a slight uptick in air movement as spring approaches. The trend continues into October, maintaining a steady pace with 5.4 m/s (12 mph), emphasizing that this transitional period brings with it not just warmer temperatures, but also a refreshing breeze. Overall, the winds during these late winter and early spring months appear to remain relatively mild, with a subtle increase that enhances the charm of the coastal landscape, making it a delightful time for both locals and visitors to enjoy the scenic beauty of Hermanus.
Weather in Hermanus varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hermanus, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns, with September generally cooler and more variable. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). The month experiences a moderate amount of precipitation at 46 mm (1.8 in) over 8 days and a humidity level of 76%. In contrast, January boasts a warmer and more stable climate, with temperatures ranging from 15°C (60°F) to 29°C (84°F) and an average of 20°C (69°F). The precipitation is significantly lower at 23 mm (0.9 in) over just 5 days, while humidity remains slightly higher at 77%. For more details, you can check out Hermanus weather in January.
In September, temperatures range from a cool 9°C (48°F) at night to a mild 28°C (83°F) during the day, averaging around 15°C (59°F). The month sees about 46 mm (1.8 in) of rainfall over approximately 8 days, with a humidity level of 76%. In contrast, February offers warmer conditions, with minimum temperatures of 16°C (60°F) and highs reaching up to 29°C (84°F), averaging around 20°C (69°F). Precipitation is significantly lower in February, at just 17 mm (0.7 in) over about 5 days, and humidity slightly increases to 80%. For more details on February weather, you can check Hermanus weather in February.
When comparing the weather in September and March, September tends to be cooler with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 28°C (83°F), averaging around 15°C (59°F). It experiences slightly higher precipitation at 46 mm (1.8 in) over 8 days, along with a humidity level of 76%. In contrast, March offers milder conditions, with minimum temperatures of 14°C (58°F) and maximums reaching 27°C (81°F), averaging 19°C (67°F). It has less rainfall, totaling 31 mm (1.2 in) over 6 days, and a slightly higher humidity level of 81%. For a more detailed look at March weather, you can visit Hermanus weather in March.
In September, temperatures in Hermanus range from a minimum of 9°C (48°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). The month experiences a total precipitation of 46 mm (1.8 in) spread over 8 days, coupled with a humidity level of 76%. In contrast, April sees slightly warmer temperatures, with a minimum of 12°C (54°F) and a maximum of 30°C (86°F), averaging 17°C (64°F). The total precipitation in April is less at 25 mm (1.0 in), occurring over 6 days, and the humidity is marginally higher at 80%. For a more detailed look at April's weather, you can check Hermanus weather in April.
In September, temperatures range from a cool 9°C (48°F) at night to a warm 28°C (83°F) during the day, averaging around 15°C (59°F), while May sees a slightly warmer minimum of 11°C (53°F) and an average of 16°C (61°F). Both months can reach a maximum of 28°C (83°F), but May tends to be wetter, with 75 mm (2.9 in) of precipitation over 6 days compared to September's 46 mm (1.8 in) over 8 days. Additionally, humidity levels are quite similar in both months, with September at 76% and May at 78%. For more detailed insights on May weather, you can visit Hermanus weather in May.
The weather in September shows a broader temperature range compared to June, with September experiencing maximums of up to 28°C (83°F), whereas June peaks at 23°C (74°F). Both months start with similar minimum temperatures of around 9°C (48°F), but September's average temperature is slightly warmer at 15°C (59°F). However, September is drier, with 46 mm (1.8 in) of precipitation over 8 days, while June has higher rainfall totals of 84 mm (3.3 in) across 10 days, resulting in a more humid atmosphere at 79%. For a more detailed look at the weather patterns specific to June, you can visit Hermanus weather in June.
In comparing the weather between September and July, September generally showcases warmer temperatures with an average of 15°C (59°F), peaking at 28°C (83°F), compared to July's cooler average of 14°C (57°F) and a maximum of 23°C (74°F). Both months exhibit a similar minimum temperature of 9°C (48°F), indicating that their cool nights are consistent. However, September experiences less precipitation, with 46 mm (1.8 in) over 8 days, whereas July sees higher rainfall, totaling 80 mm (3.1 in) across 9 days. Humidity remains comparable in both months, with September at 76% and July slightly higher at 80%. For further insights on July's weather, you can visit Hermanus weather in July.
September experiences milder temperatures compared to August, with minimums of 9°C (48°F) and maximums reaching up to 28°C (83°F) on average. In contrast, August sees a slightly cooler temperature range, with minimums at 7°C (45°F) and maximums peaking at 23°C (73°F). Additionally, September has less precipitation overall, recording 46 mm (1.8 in) over 8 days, compared to August's 77 mm (3.0 in) over 11 days. Humidity levels remain similar in both months, with September at 76% and August at 77%. For more detailed information on August weather, you can refer to Hermanus weather in August.
In September, temperatures ranged from a cool 9°C (48°F) to a warm 28°C (83°F), with an average of 15°C (59°F). The month experienced about 46 mm (1.8 in) of rain spread over 8 days, and humidity levels were relatively high at 76%. In contrast, October sees a slight increase in temperature, with minimums rising to 11°C (52°F) and average temperatures reaching 16°C (61°F), while still peaking at 28°C (83°F). Precipitation increases slightly to 48 mm (1.9 in) over the same number of rainy days, resulting in a marginally higher humidity level of 77%. For a more detailed look at October weather specifics, you can check Hermanus weather in October.
In September, the weather is characterized by a broader temperature range, with minimums around 9°C (48°F) and maximums reaching up to 28°C (83°F), leading to an average of 15°C (59°F). The month experiences relatively high humidity at 76% and receives a total of 46 mm (1.8 inches) of precipitation over about 8 days. In contrast, November sees slightly warmer temperatures, with minimums around 11°C (52°F) and maximums of 25°C (78°F), averaging 17°C (63°F). There is a slight decrease in precipitation to 41 mm (1.6 inches) over 7 days, with humidity remaining low at 75%. For more details on November's weather, visit Hermanus weather in November.
September and December present a transition in weather conditions. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). Although precipitation is slightly higher at 46 mm (1.8 in) over the course of 8 days, humidity remains relatively similar to December at around 76%. In contrast, December enjoys milder temperatures, with a minimum of 14°C (57°F) and an average of 19°C (66°F), peaking at 27°C (82°F). Precipitation decreases to 28 mm (1.1 in) over 7 days, and humidity rises slightly to 77%. Overall, December is characterized by warmer and drier conditions compared to September. For more detailed information, you can check Hermanus weather in December.
As September unfolds in Hermanus, the weather begins to transition into the warmer months, showcasing a delightful mix of mild temperatures and increasing humidity. Unlike the colder winter months, visitors can expect a pleasant average temperature that makes outings more enjoyable, although a few rainy days remind us that summer is still on the horizon. With occasional precipitation and a beautiful blend of cool mornings and warmer afternoons, September offers a refreshing contrast to the harsher winter chill. For those who want to experience the delightful shift in seasonal patterns, September is a captivating time to explore the area. Dive deeper into the specifics of each season by visiting Hermanus Climate.