Last updated: August 21, 2025
In September, Port-au-Prince experiences a tropical climate characterized by warm temperatures and significant rainfall. With a maximum temperature reaching 31°C (87°F) and an average temperature of 24°C (76°F), the month remains comfortably warm. However, the minimum temperature dips to around 20°C (68°F) during the cooler nights. The city sees an impressive precipitation amount of 228 mm (9.0 in), spread over 26 days, leading to a humidity level of 73% that can make the atmosphere feel particularly sultry. This blend of heat and moisture shapes September into a month of lush greenery and vibrant life in Port-au-Prince, despite the frequent downpours.
In September, Port-au-Prince experiences a pleasant blend of warmth and mildness, with temperatures reflecting the character of late summer. The minimum temperature remains stable at 20°C (68°F), while the average climbs to 24°C (76°F), making it a comfortable time for outdoor activities. The maximum temperature reaches 31°C (87°F), nearly consistent with the warm highs of August and July, but slightly moderated. This pattern suggests that September is a gentle transition from the hot summer months, as the city begins to cool down in anticipation of autumn, while still embracing the tropical charm that defines Haiti's climate.
In September, Port-au-Prince experiences a significant spike in precipitation, with rainfall totaling 228 mm (9.0 in) over 26 days. This month marks the peak of the rainy season, reflecting an increase from the already substantial amounts seen in August. The consistent rain during September not only contributes to the region's lush landscapes but also underscores the shift in weather patterns, as the city transitions from the late summer heat into a wetter fall. With heavy downpours becoming a daily occurrence, residents must adapt to the sustained moisture, which is a stark contrast to the drier months preceding September.
In September, Port-au-Prince experiences an uptick in humidity, reaching 73%, which marks a continuation of the rising trend observed since the summer months. After a relatively moderate 57% in late spring and early summer, the humidity begins to climb, with August already peaking at 71%. This late-summer surge signals a transition into a wetter season, where the air feels notably heavier and more saturated. As the year progresses towards its end, October and November also maintain high humidity levels around 72%, suggesting that Port-au-Prince's climate remains characteristically warm and humid, particularly during this transitional phase. Thus, September not only embodies the peak of summer humidity but also serves as a precursor to the lush, vibrant conditions of the fall months.
In September, Port-au-Prince, Haiti, experiences a UV Index of 12, falling within the extreme exposure category, which necessitates caution during outdoor activities. As summer transitions into autumn, the UV index shows a slight decrease from the peak values seen in August (also 13), yet remains significantly high. With a burn time of only 10 minutes, it's crucial for residents and visitors to protect their skin from harmful rays. This trend of elevated UV levels emphasizes the importance of sunscreen and protective clothing throughout the year. To learn more about the UV Index trends in Port-au-Prince, visit Port-au-Prince UV Index.
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September in Port-au-Prince, Haiti, brings a delightful blend of warmth and radiant sunshine, averaging 312 hours of sunlight—a balance that complements the vibrant atmosphere of the city. While this marks a dip from the peak sun-soaked days of July, which dazzles with 355 hours, it still outshines the early months of the year. The transition from summer to autumn sees sunlight gradually decreasing, yet September maintains a robust glow compared to the more overcast winter months ahead. As the days shorten, the city's captivating scenery glimmers under the gentle fall light, inviting locals and visitors alike to bask in its vibrant culture.
In September, Port-au-Prince experiences a 42% chance of sunny weather, which places it in line with the city's average for the year. As summer transitions into fall, the likelihood of sunshine sees a slight uptick compared to the more cloud-laden months of August, which holds a low 31%. This trend reveals a subtle return of brighter days, bridging the seasonal shift as the rainy season begins to recede. While September may not boast the sunniest days of the year, it certainly offers a refreshing break from the heavy gloom of late summer, making it a promising time for those looking to enjoy a mix of sun and scattered showers.
In September, Port-au-Prince enjoys about 12 hours of daylight, a continuation of the trend established during the late summer months. This month marks the gradual transition from the longer days of summer, which peak at 13 hours in June and July, to the shorter days as the year approaches winter. Interestingly, the daylight duration is consistent with August, maintaining that warm balance before it begins to decrease in October. The slight dip in daylight towards the end of the year emphasizes Haiti's tropical climate, where the changes in daylight are subtle yet significant, enhancing the vibrant rhythms of daily life in this beautiful Caribbean locale.
In September, Port-au-Prince experiences the calmest winds of the year, with an average speed dropping to just 0.9 m/s (2 mph). This gentle breeze offers a stark contrast to the slightly more robust winds of preceding months like July and August, which hold steady at 1.3 m/s (3 mph) and 1.2 m/s (3 mph), respectively. As summer transitions into fall, the overall trend reveals a gradual decline in wind speed, suggesting a serene atmosphere that perfectly complements the warm, tropical climate of Haiti. With these subdued gusts, September provides a tranquil setting, inviting residents and visitors alike to revel in the beauty of the city without the distraction of blustery winds.
Weather in Port-au-Prince varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Port-au-Prince, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns. In September, temperatures range from a minimum of 20°C (68°F) to a maximum of 31°C (87°F), with an average of 24°C (76°F). The month is characterized by significant rainfall, accumulating 228 mm (9.0 in) over 26 days, and a humidity level of 73%, creating a tropical feel. In stark contrast, January features cooler weather, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 29°C (84°F) and an average of 21°C (71°F). Rainfall is minimal in January, with only 31 mm (1.2 in) over just 7 days, and humidity drops to 65%. For more details, check out Port-au-Prince weather in January.
September and February exhibit distinct weather patterns. September tends to be warmer, with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 31°C (87°F) and an average temperature of 24°C (76°F). It also experiences significantly higher precipitation, with 228 mm (9.0 in) spread over 26 days, contributing to a humidity level of 73%. In contrast, February is cooler, featuring a minimum temperature of 15°C (60°F), an average of 22°C (72°F), and a maximum of 30°C (86°F). Precipitation decreases dramatically to 32 mm (1.3 in) over just 9 days, resulting in a lower humidity of 63%. For more details, you can check Port-au-Prince weather in February.
In September, the weather is notably warmer, with average temperatures ranging from a minimum of 20°C (68°F) to a maximum of 31°C (87°F), and frequent precipitation occurring on 26 days, amounting to 228 mm (9.0 in) of rain. The humidity level is also higher at 73%, contributing to a sultry atmosphere. In contrast, March sees cooler conditions with an average temperature of 22°C (72°F) and a maximum of 29°C (84°F). Precipitation in March is significantly lower, totaling 113 mm (4.4 in) over 17 days, and humidity decreases to 59%, resulting in a more comfortable environment. For more details, visit Port-au-Prince weather in March.
In comparing the weather of September and April, September tends to be hotter and more humid. The average temperature in September is 24°C (76°F), with maximums reaching up to 31°C (87°F), while April has slightly cooler averages at 23°C (74°F) and maximums of 29°C (85°F). Additionally, September experiences more precipitation, totaling 228 mm (9.0 in) across 26 days, compared to April's 190 mm (7.5 in) over 24 days. The humidity in September is notably higher at 73%, contrasting with April's lower humidity of 58%. For more detailed information on April weather, you can visit Port-au-Prince weather in April.
In comparing the weather of September and May, both months exhibit similar average temperatures, with September ranging from a minimum of 20°C (68°F) to a maximum of 31°C (87°F), while May sees a slightly lower minimum of 18°C (65°F) and the same maximum of 31°C (88°F). However, September is notably wetter, receiving 228 mm (9.0 in) of rainfall over 26 days, compared to May's 184 mm (7.2 in) across 25 days. Additionally, September's humidity level is higher at 73%, whereas May enjoys a more comfortable 57%. For a more detailed look at May's weather, you can check Port-au-Prince weather in May.
In comparing the weather of September and June, we notice both months share similar average temperatures, hovering around 24°C (76°F), but differ in their extremes and humidity levels. September experiences slightly warmer minimum and maximum temperatures, with a low of 20°C (68°F) and a high of 31°C (87°F), whereas June has a minimum of 19°C (67°F) and a maximum of 31°C (88°F). Notably, September is much wetter, receiving 228 mm (9.0 in) of precipitation over 26 days, compared to June’s 132 mm (5.2 in) over 20 days. Additionally, the humidity in September is substantially higher at 73%, while June maintains a more comfortable 57%. For a closer look at the specifics of June’s climate, you can visit Port-au-Prince weather in June.
September weather generally features slightly warmer temperatures than July, with minimums of 20°C (68°F) compared to July's 19°C (67°F). The average temperature in September is 24°C (76°F), just a degree lower than July's 25°C (77°F), while September boasts a maximum temperature of 31°C (87°F), similar to July's 32°C (90°F). However, September experiences significantly more precipitation, with 228 mm (9.0 in) falling over 26 days, in contrast to July's 139 mm (5.5 in) over 22 days. Additionally, September's humidity is higher at 73%, compared to July's 63%. For more detailed insights, check out Port-au-Prince weather in July.
In comparing the weather between August and September, we see some notable differences. September has slightly cooler average temperatures, with a minimum of 20°C (68°F), an average of 24°C (76°F), and a maximum of 31°C (87°F), whereas August tends to be warmer, featuring a minimum of 20°C (68°F), an average of 25°C (77°F), and a maximum of 32°C (89°F). Additionally, September experiences more precipitation, with 228 mm (9.0 in) of rainfall over 26 days, compared to August's 192 mm (7.6 in) over 23 days. Humidity levels are also slightly higher in September at 73%, compared to 71% in August. For a closer look at August's climatic conditions, you can refer to Port-au-Prince weather in August.
In comparing the weather between September and October, we see a slight cooling trend with minimal differences in temperature. While September boasts a minimum of 20°C (68°F) and peaks at 31°C (87°F), October sees only a slight drop with a minimum of 19°C (66°F), maintaining the same maximum. Both months experience high humidity levels, with September at 73% and October slightly lower at 72%. Precipitation also decreases from September’s 228 mm (9.0 in) over 26 days to October's 207 mm (8.2 in) across 24 days. For a more detailed view of October’s weather, you can visit Port-au-Prince weather in October.
In September, the weather tends to be warmer with minimum temperatures around 20°C (68°F) and average highs reaching up to 31°C (87°F). This month also experiences significant rainfall, averaging 228 mm (9.0 in) over 26 days, resulting in a humidity level of 73%. In contrast, November sees slightly cooler temperatures, with a minimum of 16°C (62°F) and a maximum of 29°C (85°F), paired with reduced precipitation of 150 mm (5.9 in) over 18 days. The humidity remains relatively consistent at 72%, making November a bit drier overall. For more detailed information, you can refer to Port-au-Prince weather in November.
In September, the weather is notably warmer, with average temperatures reaching around 24°C (76°F) and maximums climbing up to 31°C (87°F). This month also sees a significant amount of rainfall, with precipitation occurring over 26 days and totaling 228 mm (9.0 in). In contrast, December experiences cooler temperatures, with averages dropping to 22°C (72°F) and highs of 29°C (84°F). Furthermore, December is much drier, featuring only 36 mm (1.4 in) of precipitation over just 8 days. This results in a slightly lower humidity level of 69%. For more specific details, check the Port-au-Prince weather in December.
September in Port-au-Prince marks a transition into the wetter part of the year, characterized by increased rainfall and high humidity levels. This month typically brings frequent showers, making the air feel more saturated compared to the dryer preceding months. With temperatures that can peak at a warm 31°C (87°F) but often settle at a comfortable 24°C (76°F), September stands out as a blend of heat mingled with refreshing, albeit frequent, downpours. While humidity hovers around 73%, it contributes to a unique tropical atmosphere that can be both invigorating and oppressive. For a deeper understanding of how this month fits into the overall climate pattern, check out our detailed analysis at Port-au-Prince Climate.