Last updated: August 31, 2025
In Swellendam, South Africa, September brings a dynamic range of temperatures, with maximums reaching up to 37°C (99°F), while the average settles comfortably at 15°C (59°F). The month can experience drops to a brisk 2°C (35°F) at night, offering a refreshing contrast. Rainfall is moderate, totaling 28 mm (1.1 in) over five days, leaving the air with a palpable 77% humidity that adds to the vibrant spring atmosphere. As the landscape awakens, September becomes a captivating time to experience the region's shifting weather patterns and lush surroundings.
In Swellendam, South Africa, September marks a transitional month as the winter chill begins to dissipate, paving the way for the warmth of spring. With minimum temperatures around 2°C (35°F), the mornings can still be brisk, but the average temperature of 15°C (59°F) suggests a gradual warming trend. The maximums can soar to an impressive 37°C (99°F), reflecting a significant increase from the cooler months before. This month bridges the cooler winter temperatures seen from June to August and the rising warmth of the upcoming summer, offering a comfortable climate that is perfect for outdoor explorations. As days lengthen and the sun shines brighter, September invites visitors to experience the vibrant landscapes of Swellendam.
In Swellendam, South Africa, September marks a transitional period in precipitation, receiving 28 mm (1.1 in) of rain over five days. This amount, while slightly lower than the preceding month's 36 mm, reflects a decrease in rainfall as the region moves toward drier conditions in the upcoming months. Notably, September's precipitation can be seen as part of a broader trend: after consistently higher rainfall from June to August, the onset of spring brings a gradual reduction in both total precipitation and rainy days, suggesting a shift toward the warmer, drier months ahead. The changing patterns in September not only hint at the upcoming summer climate but also highlight the dynamism of Swellendam's weather throughout the year.
As September rolls in, Swellendam experiences a relatively comfortable humidity level of 77%, a slight dip from the preceding months. Following the peak of summer, where humidity levels reached an impressive 83% in March, the trend shows a gradual decrease as the year transitions into autumn. August registers the lowest humidity at 76%, setting the stage for September's mild conditions. This pattern of declining humidity continues into the later months of the year, with October expected to see a slight increase back to 79%. Overall, the trend reflects a rhythm of high humidity in the earlier months, followed by a refreshing moderation as the seasons change.
In Swellendam, South Africa, September marks a transition as the UV Index rises to 9, categorizing it as very high with a burn time of just 15 minutes. This increase from the more moderate levels seen in the winter months indicates that as spring approaches, sun exposure becomes a greater concern. After a relatively mild winter, where the UV Index hovered around 4 to 6, the uptick in September serves as a reminder for residents and visitors alike to take precautions against UV radiation. With the UV Index predicted to escalate again in October, reaching 11 once more in the extreme category, it's crucial to stay informed and protected. For more detailed information, you can check out the complete Swellendam UV Index.
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As September rolls in, Swellendam experiences a delightful transition into spring, marked by an impressive 324 hours of sunshine. This month stands out as a significant uptick from the cooler, cloudier winter months, where sunlight dipped to a low of 276 hours in June. Following a steady climb from the depths of winter, September welcomes brighter days, hinting at the radiant October ahead, which boasts an impressive 362 hours of sunshine. Such trends illustrate not only the gradual shift towards warmer weather but also Swellendam's appeal as an inviting destination for outdoor enthusiasts and sun-seekers alike as they embrace the vibrant energy of the spring season.
In Swellendam, South Africa, September marks a transitional period as the winter chill begins to fade. With a 50% chance of sunny weather, the month stands out as neither particularly bright nor dreary, sitting right at the midpoint of the annual sun probability spectrum. This change follows a string of months with relatively high sunlight, peaking in the heart of summer, where January and February bask in a robust 66% sun chance. As autumn approaches, September reflects a shift towards variability, hinting at the impending summer while hinting at the lingering effects of winter. Thus, while you might enjoy the occasional sunny day, be prepared for a mix of weather as nature transitions from the cool to the warm.
As September arrives in Swellendam, South Africa, the daylight duration begins to transition from the crisp, shorter days of winter towards the longer days of spring. With 11 hours of daylight, September marks a turning point, as the sun rises earlier and sets later, hinting at the brighter months ahead. This gradual increase in daylight follows a pattern seen throughout the year, where longer days are embraced in January and December, while the depths of winter in June and July see the shortest durations. The shift back to 12 hours in October further emphasizes this delightful trend as nature awakens, inviting residents and visitors alike to savor the gradual return of sunlight.
As the seasons shift in Swellendam, South Africa, September ushers in a gentle breeze, with an average wind speed of 2.5 m/s (6 mph). This month marks a slight uptick from the quieter lull of winter, which experienced its calmest winds in August, averaging 2.2 m/s (5 mph). Overall trends reveal a gradual increase in wind speeds as the year progresses, peaking in the summer months of December, January, and February, where speeds consistently rise to around 3.0 m/s (7 mph). September serves as a transitional period, featuring mild winds that refresh the landscape, heralding the vibrant life that accompanies the warmer months ahead.
Weather in Swellendam varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Swellendam, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, temperatures in Swellendam range from a cool 2°C (35°F) at night to a warm 37°C (99°F) during the day, with an average temperature of 15°C (59°F). The month sees relatively low precipitation of 28 mm (1.1 in) over about 5 days, and humidity hovers around 77%. In contrast, January offers warmer conditions, with nighttime lows of 11°C (52°F) and daytime highs reaching up to 41°C (107°F). The average temperature rises to 22°C (72°F), and while precipitation increases slightly to 35 mm (1.4 in) over 6 days, the humidity remains comparable at 79%. For more details, check out Swellendam weather in January.
September and February present distinct weather characteristics. In September, temperatures range from a chilly 2°C (35°F) at night to a warm 37°C (99°F) during the day, with an average of 15°C (59°F). This month experiences about 28 mm (1.1 in) of precipitation over roughly 5 days, accompanied by a humidity level of 77%. In contrast, February offers milder nights with a minimum of 11°C (52°F) and higher daytime temperatures peaking at 40°C (104°F), resulting in an average of 22°C (72°F). Precipitation decreases slightly to 22 mm (0.9 in), occurring over 6 days, and humidity rises to 82%. Both months showcase unique climatic features, but February tends to be warmer and more humid overall. For more specific insights, check Swellendam weather in February.
When comparing the weather in September and March, September tends to have cooler average temperatures, ranging from a minimum of 2°C (35°F) to a maximum of 37°C (99°F), with a comfortable average of 15°C (59°F). In contrast, March experiences milder conditions with a minimum of 8°C (47°F) and an average temperature of 20°C (69°F), peaking at 36°C (98°F). Additionally, September sees less precipitation at 28 mm (1.1 in) over 5 days, while March has more rainfall, totaling 38 mm (1.5 in) spread over 7 days. Humidity levels are relatively high in both months, slightly increasing from 77% in September to 83% in March. For a more detailed look at the weather during March, you can visit Swellendam weather in March.
When comparing the weather in September to that in April, several notable differences emerge. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 37°C (99°F), with an average of 15°C (59°F). The month experiences about 28 mm (1.1 in) of precipitation over five days, accompanied by a humidity level of 77%. In contrast, April tends to be slightly milder, featuring minimum temperatures of 6°C (43°F), an average of 17°C (64°F), and a maximum of 38°C (101°F). Precipitation is lower in April, totaling around 17 mm (0.7 in) over four days, though humidity is slightly higher at 82%. For a more detailed look at April weather specifically, you can visit Swellendam weather in April.
When comparing the weather in September and May, we see some notable similarities and differences. Both months feature an average temperature of around 15°C (59°F), but September can experience more extreme highs, reaching up to 37°C (99°F), compared to May's maximum of 33°C (91°F). In terms of precipitation, September receives slightly less rainfall at 28 mm (1.1 in) over 5 days, while May has 29 mm (1.2 in) with rain on 4 days. Humidity levels are quite similar, both hovering around 77% in September and 78% in May. For a detailed look at May’s weather, you can visit Swellendam weather in May.
In comparing the weather between September and June, September tends to showcase a broader temperature range, with minimums reaching 2°C (35°F) and maximums soaring to 37°C (99°F), compared to June's milder range of 0°C (32°F) to 29°C (85°F). Both months experience similar humidity levels of 77% and have approximately five days of precipitation, but September is slightly wetter with 28 mm (1.1 in) compared to June's 23 mm (0.9 in). Overall, September offers a mix of warmer days and cooler nights, while June presents a generally cooler climate. For a detailed look at June weather, visit Swellendam weather in June.
In comparing the weather between September and July, September generally offers a wider temperature range with minimums reaching 2°C (35°F) and maximums soaring to 37°C (99°F), averaging around 15°C (59°F). In contrast, July sees slightly cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 31°C (88°F), averaging at 12°C (54°F). Although September experiences slightly less precipitation at 28 mm (1.1 in) over 5 days, compared to July's 32 mm (1.3 in) over 6 days, the overall humidity remains similar, with September at 77% and July at 78%. For more detailed information on July weather, you can check Swellendam weather in July.
In comparing the weather between September and August, September tends to be warmer with an average temperature of 15°C (59°F) compared to August's average of 12°C (54°F). Notably, September also experiences higher maximum temperatures, reaching up to 37°C (99°F), while August peaks at a more moderate 31°C (88°F). However, September has slightly less precipitation, with 28 mm (1.1 in) over 5 days, compared to August's 36 mm (1.4 in) over 6 days. Humidity remains fairly consistent, with September at 77% and August at 76%. For a closer look at August weather specifics, you can visit Swellendam weather in August.
In comparing the weather of September and October, we see a gradual transition toward slightly warmer and wetter conditions. September features temperatures ranging from a minimum of 2°C (35°F) to a maximum of 37°C (99°F), with an average of 15°C (59°F) and only 28 mm (1.1 in) of precipitation over 5 days. By October, the minimum temperature increases to 4°C (40°F), and the average rises to 17°C (63°F), although the maximum can reach up to 39°C (102°F). Precipitation also sees a slight uptick to 30 mm (1.2 in) across 7 days, and humidity increases marginally to 79%. For more details, you can check Swellendam weather in October.
In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 37°C (99°F), with an average temperature of 15°C (59°F). The month sees relatively low precipitation at 28 mm (1.1 in) over five days, maintaining a humidity level of 77%. In contrast, November experiences a slightly milder climate with minimum temperatures at 7°C (44°F) and maximum temperatures peaking at 38°C (101°F), averaging 18°C (66°F). Precipitation increases to 45 mm (1.8 in) across six days, while humidity remains consistent at 77%. For more detailed insights, you can check Swellendam weather in November.
In September, the weather showcases a wider temperature range, with minimums dipping to 2°C (35°F) and highs soaring up to 37°C (99°F), resulting in an average temperature of 15°C (59°F). The month sees about 28 mm (1.1 in) of precipitation over 5 days, coupled with relatively high humidity at 77%. In contrast, December experiences milder minimum temperatures at 9°C (49°F), while highs can reach up to 40°C (105°F), leading to a warmer average of 20°C (69°F). Precipitation slightly decreases to 25 mm (1.0 in) over 6 days, with humidity rising to 79%. For more details, take a look at Swellendam weather in December.
As September arrives in Swellendam, the weather displays a delightful transition from the chill of winter to the warmth of spring. With average temperatures rising significantly compared to the earlier months, residents and visitors can enjoy mild days contrasted by cooler nights. The occasional rainfall, averaging just 28 mm throughout the month, ensures the lush landscapes stay vibrant and green. Humidity levels hover at a comfortable 77%, enhancing the fresh, crisp air. While September may usher in the first hints of heat, it still retains the refreshing charm that sets the stage for the warmer months ahead. For a deeper understanding of what to expect throughout the year, visit Swellendam Climate.