Last updated: August 31, 2025
September in Rabaul, Papua New Guinea offers a tropical climate characterized by warm temperatures and significant rainfall. With maximums reaching 29°C (85°F) and an average of 27°C (80°F), the weather remains comfortably warm but can feel humid, often due to a high humidity level of 88%. Visitors should prepare for frequent rain, as 19 days typically see a total precipitation of 178 mm (7.0 in). This combination of warmth and moisture creates a vibrant and lush environment, making September a unique time to explore the stunning natural beauty of Rabaul.
In September, Rabaul, Papua New Guinea, continues to bask in its tropical climate, characterized by consistent temperatures that closely mirror those of the preceding months. With minimums resting at a warm 25°C (77°F) and averages hovering around 27°C (80°F), visitors can expect a pleasant atmosphere. The maximum temperature peaks at around 29°C (85°F), providing just the right balance for outdoor adventures and exploration of the region's stunning landscapes. As the month aligns with a gradual transition towards the warmer quarter of the year, September's weather remains inviting, making it an ideal time for travelers seeking both warmth and comfort in this vibrant Pacific destination.
In September, Rabaul experiences a notable transition in its precipitation patterns, receiving 178 mm (7.0 in) of rain over 19 days. As the dry season begins to wane, the rainfall in September marks a shift towards increased moisture, although it remains slightly lower than the preceding months. This uptick in precipitation from the drier months of June and July sets the stage for the upcoming wet season, emphasizing the region's tropical climate. The rainfall begins to build momentum, hinting at the more substantial downpours expected in October and November, which typically average higher precipitation levels. Overall, September serves as a bridge between the drier months and the wetter ones, illustrating the dynamic weather patterns characteristic of Rabaul.
As September rolls into Rabaul, Papua New Guinea, the humidity continues to hover at a notably high level of 88%, reflecting a trend that peaks during the wet season. Following the previous month of 89%, September's figures indicate a slight dip, although they still align with the trend of increased moisture that begins in the mid-year months of June and July. While the humidity starts to decrease slightly as the year progresses into October, it remains elevated compared to the early part of the year, which generally sees readings in the 77-78% range. This pattern highlights Rabaul's characteristically tropical climate, where warmth and moisture intermingle, creating a luscious environment that supports its rich biodiversity.
In September, Rabaul experiences a UV Index of 15, categorized as extreme, with a burn time of just 10 minutes. This month continues the trend of high UV exposure seen from January through April, where indices peaked between 15 and 17. Though a slight decrease occurs in May and June, the UV levels rebound in September, urging residents and visitors alike to remain vigilant and protect their skin against rapid sunburn. With consistent extreme levels throughout the year, it’s crucial to stay informed about UV exposure. For more detailed insights, visit Rabaul UV Index.
UV Risk Categories
As September rolls into Rabaul, Papua New Guinea, residents and visitors alike can bask in 263 hours of sunshine, a delightful close to the dry season. This month sees just slightly less sun than August's peak of 273 hours, highlighting a trend of consistently abundant daylight as the year progresses. Following the mid-year high of 265 hours in June, the slightly lower yet still generous sun exposure in September promises warm days and inviting beach weather. As the dry season starts to transition towards the wet, this beautiful month offers a perfect opportunity to soak in the beauty of Rabaul's stunning landscapes before the weather changes. With October expected to shine even more brightly at 277 hours, the sunny allure of Rabaul remains irresistible.
In Rabaul, Papua New Guinea, September brings with it a 17% chance of sunny weather, placing it on the lower end of the spectrum for the year. Following the vibrant sunshine of August, which enjoys a 38% chance, September marks a noticeable dip, signaling the arrival of the wetter season as the landscape transitions. While early spring might tease visitors with pockets of sunshine, the overall trend highlights a gradual increase in sun likelihood from the subsequent months, especially with October soaring to 41%. Thus, while the sun may be a bit shy in September, hope is on the horizon as the days brighten in the month ahead.
As September unfolds in Rabaul, Papua New Guinea, daylight returns to a harmonious 12 hours, mirroring the consistent brightness of the earlier months. Following a stretch of 11 hours during the cooler months of June through August, the daylight duration begins to lengthen, signaling a gentle transition towards the more vibrant months of late spring. This pattern of 12-hour days persists from September through December, providing a delightful balance of light that allows residents and visitors alike to bask in the tropical sun. The rhythmic cycle of daylight underscores the region's climatic stability, making Rabaul a picturesque destination year-round.
As September arrives in Rabaul, Papua New Guinea, residents and visitors alike can feel the invigorating breeze picking up, with average wind speeds reaching 4.1 m/s (9 mph). This increase marks a noticeable trend as the winds begin to strengthen from the more moderate months of summer, where speeds hovered around 2.5 m/s to 3.9 m/s. The heightened winds of September not only signal a shift in the seasonal climate but also offer a refreshing respite from the tropical heat, inviting outdoor adventures and a richer connection with the stunning natural beauty of the region. Following September, however, the winds gradually wane, retreating back to calmer conditions in the later months of the year, emphasizing the unique ebb and flow of Rabaul's weather patterns.
Weather in Rabaul varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rabaul, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather remains warm with minimum temperatures around 25°C (77°F) and average temperatures peaking at 27°C (80°F). The month experiences significant rainfall, with about 178 mm (7.0 in) of precipitation spread over 19 days and high humidity levels at 88%. In contrast, January sees slightly higher temperatures, with minimums and averages similar to September, but maximums can climb to 30°C (86°F). Rainfall increases to 216 mm (8.5 in) over 21 days, though humidity drops to 78%. For more detailed insights, you can check Rabaul weather in January.
When comparing the weather in September and February, both months exhibit warm temperatures, with minimums around 25°C (77°F), and averages hovering between 27°C (80°F) and 28°C (82°F). However, February tends to be slightly warmer, with a maximum temperature reaching up to 30°C (86°F). Precipitation is notably higher in February, accumulating 299 mm (11.8 in) over 26 days, compared to 178 mm (7.0 in) over 19 days in September. Additionally, February experiences lower humidity levels at 77%, whereas September has a higher humidity of 88%. For more details on February weather specifics, you can visit Rabaul weather in February.
In comparing the weather of September and March, both months experience similar average temperatures, with September showing a minimum of 25°C (77°F), an average of 27°C (80°F), and a maximum of 29°C (85°F). In contrast, March has a slightly higher maximum temperature of 30°C (86°F) while maintaining the same minimum and average temperatures. However, March is notably wetter, with total precipitation reaching 407 mm (16.0 in) over 28 days, compared to September's 178 mm (7.0 in) across 19 days. Additionally, humidity levels are slightly lower in March at 78%, compared to a high of 88% in September. For more detailed information, you can visit Rabaul weather in March.
When comparing the weather in September and April, both months exhibit similar average temperatures, with September ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), and April having slightly warmer temperatures, peaking at 30°C (86°F). However, April experiences a significantly higher amount of rainfall, with 336 mm (13.2 in) over 27 days, compared to September's 178 mm (7.0 in) spread across 19 days. Additionally, humidity levels are higher in September at 88%, while April maintains a lower 77% humidity. For more detailed information on the weather during April, you can visit Rabaul weather in April.
In both September and May, temperatures are quite similar, with minimums around 25°C and averages hovering between 27°C and 28°C. However, May tends to be slightly warmer with a maximum temperature reaching 30°C compared to September's peak of 29°C. When it comes to precipitation, May is wetter, accumulating 204 mm over 23 days, whereas September has less rainfall at 178 mm spread across 19 days. Additionally, humidity levels are higher in September at 88%, compared to a more comfortable 77% in May. For more detailed weather information about May, you can check Rabaul weather in May.
In comparing the weather between September and June, we find that both months showcase similar temperature ranges, with a minimum of 25°C (77°F), an average of around 27°C (80°F for September and 81°F for June), and a maximum of 29°C (85°F). However, September experiences significantly more precipitation, with 178 mm (7.0 in) over 19 days compared to June's 119 mm (4.7 in) under the same number of rainy days. Additionally, September's humidity levels are slightly higher at 88%, while June sees a lower humidity of 82%. For more specific insights into June weather, you can check the detailed information at Rabaul weather in June.
In comparing the weather of September and July, both months exhibit similar temperature ranges, with minimums around 25°C (77°F) and average temperatures peaking at 27°C (80°F). However, July tends to be slightly warmer, featuring a maximum temperature of 30°C (85°F), compared to September's 29°C (85°F). Precipitation levels are nearly identical, with July receiving 179 mm (7.1 in) over 20 days, while September sees a slight dip to 178 mm (7.0 in) across 19 days. Humidity levels are also comparable, with September slightly more humid at 88% compared to July's 86%. For more details on July's climate, visit Rabaul weather in July.
In comparing the weather of September and August, both months exhibit relatively stable temperatures, with minimums at 25°C (77°F), averages at 27°C (80°F), and maximums reaching 29°C (85°F). However, September experiences slightly less precipitation at 178 mm (7.0 in) over 19 days, compared to August's 191 mm (7.5 in) over 18 days. Additionally, while humidity levels are quite similar, September has a slightly lower humidity at 88% versus August's 89%. For more detailed insights into August weather, you can check Rabaul weather in August.
In September, the weather is characterized by slightly lower temperatures, with an average of 27°C (80°F) and a maximum of 29°C (85°F), compared to October, where the average temperature rises to 27°C (81°F) and peaks at 30°C (86°F). Both months experience high humidity levels, but September is slightly more humid at 88% compared to October's 85%. Precipitation is quite significant in both months, with September receiving 178 mm (7.0 in) over 19 days, while October sees a slightly lower total of 171 mm (6.7 in) spread over 22 days. For more details on the weather patterns in October, you can refer to Rabaul weather in October.
In September, the weather typically features temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), with an average of 27°C (80°F). The month often brings substantial rainfall, accumulating 178 mm (7.0 in) over 19 days, accompanied by high humidity at 88%.
In contrast, November experiences slightly warmer temperatures, with a minimum of 25°C (78°F) and a maximum of 30°C (86°F), averaging around 27°C (81°F). However, it also sees increased precipitation, totaling 227 mm (8.9 in) spread over 24 days, while humidity decreases slightly to 81%. For more detailed information on November weather, you can check Rabaul weather in November.
In September, the weather features warm temperatures with a minimum of 25°C (77°F) and an average around 27°C (80°F), peaking at 29°C (85°F). This month also sees significant rainfall, with 178 mm (7.0 in) over 19 days, contributing to high humidity levels of 88%. In contrast, December offers slightly warmer temperatures with a minimum of 25°C (78°F), an average of 27°C (81°F), and a maximum of 30°C (86°F). However, it experiences heavier precipitation, totaling 339 mm (13.3 in) across 28 days, and lower humidity at 78%. The increased rainfall in December can lead to a noticeably more humid atmosphere. For more detailed information, you can refer to Rabaul weather in December.
September in Rabaul brings a delightful blend of warmth and humidity, making it a unique month in comparison to other times of the year. With average temperatures hovering around 27°C, it offers pleasant conditions for outdoor activities, yet the high humidity levels of 88% and significant rainfall—with precipitation on 19 days—adds a touch of tropical intensity. This combination sets September apart, as the region experiences a peak in its wet season, fostering lush landscapes that showcase the beauty of nature. For more insights into Rabaul's climate trends throughout the year, visit Rabaul Climate.