Last updated: August 31, 2025
Experience the vibrant weather of Port Saint John's, South Africa in September, where temperatures can soar to a maximum of 34°C (94°F), offering warm days that invite exploration. On average, the temperature rests at a comfortable 17°C (64°F), while nighttime brings a refreshing minimum of 9°C (48°F). However, be prepared for the possibility of rain, as 62 mm (2.4 in) of precipitation falls over approximately 10 days, creating a lush, green landscape. With humidity levels around 82%, September's weather beautifully blends warmth and moisture, perfect for enjoying this stunning coastal destination.
In September, Port Saint John’s experiences a gentle transition as winter gives way to the warmth of spring. Minimum temperatures rise slightly to 9°C (48°F), while the average climbs to a comfortable 17°C (64°F). The maximum temperature can soar to a balmy 34°C (94°F), providing a perfect backdrop for outdoor adventures. This month marks a significant increase from the cooler August temperatures, showcasing the shift towards warmer days ahead. As the landscape begins to bloom, September invites both residents and visitors to relish the pleasant and increasingly sunny conditions that herald the arrival of spring.
In September, Port Saint John's experiences a notable uptick in precipitation, receiving 62 mm (2.4 in) of rainfall over approximately 10 days. This marks a transition from the relatively dry winter months, where July recorded a mere 10 mm (0.4 in). As we move into spring, the precipitation levels start to rise, with September showing a significant increase compared to the preceding months of June and July. This shift sets the stage for the wetter months ahead, as October and November loom with even heavier rainfall averages of 111 mm (4.4 in) and 123 mm (4.9 in), respectively. Overall, September acts as a bridge, where the landscape begins to flourish again, nurturing the lush greenery typical of the region.
In September, Port Saint John’s experiences a resurgence in humidity, with levels reaching 82%. This marks a slight increase from the drier months of July and August, which saw humidity dipping to 77% and 72%, respectively. The trend this time of year suggests a gradual climb back towards the higher humidity levels typical of the summer months, as seen in earlier months where humidity consistently hovered around 88% to 89%. As the region transitions into spring, the refreshing increase in moisture not only signals changes in the weather but also sets the stage for lush landscapes and vibrant flora that thrive in these conditions.
As September rolls around in Port Saint John's, South Africa, residents and visitors should prepare for a very high UV Index of 9, indicating a burn time of just 15 minutes. This marks a return to elevated levels after the milder months of winter, with the UV Index transitioning from a moderate 4 in June and July to the significant heights typical of late spring and summer. Following a pattern seen in the preceding months, the UV Index consistently spikes towards the end of the year, making sun protection essential. With the sun's intensity on the rise, it's crucial to stay informed and take precautions. For more detailed insights, visit Port Saint John's UV Index.
UV Risk Categories
As September rolls in, Port Saint John's welcomes a delightful average of 311 hours of sunshine, continuing a trend of bright and vibrant days that began in the earlier months. Nestled between the peak warmth of October with its impressive 346 hours and the mellow days of August at 309 hours, September strikes a perfect balance, ensuring that both locals and visitors enjoy the comfort of sunlit adventures. This month serves as a gentle reminder of the beautiful transition into spring, where sunlight gently lingers, encouraging outdoor explorations and serene moments by the coast. With the gradual increase in daylight from the cooler winter months, September promises a refreshing blend of warmth and radiance, ideal for soaking in all that this stunning locale has to offer.
In Port Saint John's, South Africa, September marks a transition in sunny weather, as the chance of sunshine stands at 47%. This figure reflects a notable shift from the intense sunny days of July, which boast an impressive 86% likelihood, and gradually descends through August’s 64%. While September doesn't quite reach the levels of late autumn, it maintains a similar pattern to April. This suggests that while the sun may not reign supreme this month, there's still a fair chance to enjoy pleasant days amidst the welcoming arrival of spring. As the days grow longer and warmer, the climate hints at the promise of clearer skies ahead in the coming months.
As September arrives in Port Saint John's, South Africa, the daylight duration begins to shift, offering 11 hours of sunlight each day. This marks a subtle transition from the deeper winter months of July and August, which maintain a steady 10 hours of daylight. Following September, daylight gradually increases once more, reaching 12 hours in October and peaking at 14 hours in December. Overall, September serves as a gentle bridge between the shorter winter days and the longer, warmer summer months, hinting at the vibrant energy that lies ahead.
As September rolls into Port Saint John’s, South Africa, the wind begins to dance a little more energetically, with an average speed of 3.6 m/s (8 mph). This slight increase marks a subtle crescendo in the seasonal wind patterns, a gentle reminder of nature's transition toward the end of winter. Following months of stability with speeds around 3.0 to 3.5 m/s, September serves as a precursor to the more robust winds of October, which see a further uptick to 3.8 m/s (9 mph). This gradual rise not only hints at the changing seasons but also creates an invigorating atmosphere, perfect for those who embrace the crisp coastal breeze that characterizes this beautiful region.
Weather in Port Saint John's varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Port Saint John's, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is quite variable, with temperatures ranging from a cool 9°C (48°F) to a warm 34°C (94°F), and an average temperature of 17°C (64°F). During this month, rainfall totals around 62 mm (2.4 in) over approximately 10 days, making the humidity relatively high at 82%. In contrast, January boasts milder temperatures, with a minimum of 15°C (59°F) and a maximum of 35°C (95°F), leading to a higher average of 22°C (73°F). However, January also sees increased precipitation, totaling 101 mm (4.0 in) over 15 days, and slightly higher humidity at 88%. For more specific details about January conditions, visit Port Saint John's weather in January.
September and February present distinct weather patterns, highlighting the transition from late winter to early summer. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 34°C (94°F), with an average of 17°C (64°F). The month experiences approximately 62 mm (2.4 in) of precipitation over about 10 days, accompanied by a relatively high humidity of 82%.
In contrast, February boasts milder temperatures, with a minimum of 15°C (59°F), an average of 23°C (73°F), and a similar maximum of 34°C (93°F). However, it also sees significantly increased rainfall, totaling 137 mm (5.4 in) across 17 days, and slightly higher humidity at 88%. This makes February typically wetter and more humid compared to the drier September. For more insights, you can check Port Saint John's weather in February.
When comparing September and March, we see notable differences in temperature and precipitation patterns. September experiences a temperature range from a cool 9°C (48°F) at night to a warm 34°C (94°F) during the day, with an average of 17°C (64°F). In contrast, March offers milder nights with a minimum of 14°C (57°F) and a higher average temperature of 22°C (72°F), peaking at 33°C (92°F). Precipitation is also heavier in March, with 126 mm (4.9 in) falling over 16 days, compared to September’s 62 mm (2.4 in) across just 10 days. The humidity is slightly elevated in March at 89%, versus September’s 82%. For more information on specific conditions, you can check Port Saint John's weather in March.
September and April present contrasting weather patterns. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 34°C (94°F), with an average of 17°C (64°F). The month experiences 62 mm (2.4 in) of precipitation over about 10 days, accompanied by a humidity level of 82%. In contrast, April enjoys slightly warmer temperatures, with a minimum of 11°C (53°F), an average of 20°C (68°F), and a maximum of 33°C (92°F). However, it has significantly higher rainfall, totaling 130 mm (5.1 in) across 12 days, and a humidity level of 89%. For a closer look at April's weather specifics, you can check Port Saint John's weather in April.
In comparing the weather of September and May, both months experience mild temperatures, but September tends to be warmer on average, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 34°C (94°F). In contrast, May starts slightly cooler, with temperatures ranging from 8°C (47°F) to a maximum of 31°C (87°F). While both months see some rainfall, September receives more precipitation (62 mm over 10 days) compared to May, which has 53 mm over just 4 days. The humidity levels are also notably high in both months, with September at 82% and May slightly higher at 88%. For a more detailed look at May weather, you can visit Port Saint John's weather in May.
When comparing the weather in September and June, both months feature relatively cool temperatures and high humidity levels of 82%. September experiences a broader temperature range, with minimums of 9°C (48°F) and maximums reaching 34°C (94°F), while June shows slightly cooler temperatures, peaking at 30°C (86°F). Precipitation is significantly higher in September, totaling 62 mm (2.4 in) over about 10 days, compared to June's 33 mm (1.3 in) over just 3 days. As a result, September tends to feel wetter and more variable, while June offers a slightly drier atmosphere. For further details, you can check Port Saint John's weather in June.
In September, the weather exhibits a broader temperature range with minimums dipping to 9°C (48°F) and maximums reaching as high as 34°C (94°F), compared to July, where temperatures vary from 6°C (43°F) to a maximum of 31°C (87°F). The average temperature in September is slightly warmer at 17°C (64°F), while July's average stands at 16°C (61°F). Additionally, September experiences more rainfall, with 62 mm (2.4 in) across about 10 days, in stark contrast to July's light precipitation of just 10 mm (0.4 in) over 2 days. While both months have relatively high humidity levels, September is a bit more humid at 82% compared to July's 77%. For more specifics on the weather in July, check Port Saint John's weather in July.
In comparing the weather of September and August, September experiences slightly warmer temperatures with a minimum of 9°C (48°F), an average of 17°C (64°F), and a maximum of 34°C (94°F), while August has a minimum of 7°C (45°F), an average of 16°C (61°F), and a maximum of 30°C (86°F). Additionally, September sees increased precipitation at 62 mm (2.4 in) over 10 days, compared to August’s 51 mm (2.0 in) over 8 days. Notably, humidity levels also rise in September to 82%, compared to 72% in August. For more insights on the weather in August, check out Port Saint John's weather in August.
September and October experience similar temperature ranges, with September showcasing a minimum of 9°C (48°F) and a maximum of 34°C (94°F), while October has a slightly higher minimum of 10°C (50°F) and a consistent maximum of 34°C (93°F). The average temperature rises slightly from 17°C (64°F) in September to 18°C (65°F) in October. However, October tends to be wetter, with 111 mm (4.4 in) of precipitation over 13 days compared to September's 62 mm (2.4 in) over 10 days. Humidity levels remain relatively constant, with September at 82% and October slightly increasing to 83%. For a detailed look at October's weather, you can visit Port Saint John's weather in October.
When comparing the weather in September and November, we see some notable differences. September typically features a broader temperature range with a minimum of 9°C (48°F) and an average of 17°C (64°F), while November shows slightly warmer temperatures with a minimum of 11°C (52°F) and an average of 19°C (67°F). Both months can experience maximum temperatures peaking at 34°C (93°F) to 34°C (94°F), but November is characterized by increased precipitation, receiving 123 mm (4.9 in) over 18 days compared to September's 62 mm (2.4 in) over just 10 days. Humidity also rises in November, averaging 87% compared to 82% in September. For a detailed look at November’s weather, check out Port Saint John's weather in November.
In September, temperatures in Port Saint John range from a minimum of 9°C (48°F) to a maximum of 34°C (94°F), with an average of 17°C (64°F). The month sees around 62 mm (2.4 in) of precipitation over about 10 days, with a humidity level of 82%. In contrast, December offers slightly warmer conditions, with minimum temperatures of 13°C (56°F) and maximums reaching 31°C (88°F), averaging at 21°C (70°F). However, it is also wetter, experiencing 129 mm (5.1 in) of rainfall across 18 days and higher humidity at 88%. To learn more about what to expect, visit Port Saint John's weather in December.
As September arrives in Port Saint John, the weather ushers in a delightful transition that differs markedly from the sweltering summer months. Daytime temperatures can peak at a warm 34°C, offering a pleasant reprieve from the heat while the nights cool down to an average of 17°C. The increased humidity (82%) and occasional rainfall, with about 10 days seeing precipitation, contribute to a refreshing atmosphere that signals the shift away from winter’s chill. This month stands out not just for its moderate warmth but also for the vibrant landscapes that come alive with the early spring rains. To explore more about the unique climate of this stunning coastal region, visit Port Saint John's Climate.