Last updated: August 21, 2025
In September, Sihanoukville, Cambodia, experiences a tropical climate characterized by warm temperatures with a maximum of 30°C (86°F) and an average of 27°C (81°F), dipping to a minimum of 25°C (78°F). This month also marks one of the wettest times of the year, with precipitation reaching 521 mm (20.5 in) over 27 rainy days, leading to an impressive humidity level of 87%. Travelers should prepare for a mix of sun and rain, making it a vibrant time to experience the lush landscapes and lively atmosphere of this coastal gem.
September in Sihanoukville, Cambodia, offers a delightful tropical experience, with temperatures showcasing a mild yet warm climate. The month typically sees minimums around 25°C (78°F) and averages of 27°C (81°F), perfectly balancing comfort and warmth. With daytime highs peaking at 30°C (86°F), September maintains a consistent heat that echoes the nearby months of August and July. As the rainy season approaches, the humidity may rise, but the charm of Sihanoukville's beaches remains irresistible. The temperature trends reveal a stable warmth, making it an ideal time for beach lounging or exploring the vibrant local culture, all while enjoying the typical balmy vibe of this coastal gem.
In September, Sihanoukville experiences a substantial precipitation level of 521 mm (20.5 in), marking a continuation of the region's wet season. This rainfall is a slight dip from August's peak but remains significant, as it falls within a month where rainy days linger around 27, contributing to a lush, vibrant landscape. The trend in precipitation showcases a pattern of increasing rainfall from January through August, culminating in a dramatic high during the mid-year months before tapering off in October and November. September's abundant rain, while less intense than the preceding months, continues to play a crucial role in replenishing local ecosystems and supporting agricultural activities in this coastal paradise.
In September, Sihanoukville experiences a slight dip in humidity, measured at 87%, down from the peak of 88% in August. This month falls into the midst of the wet season, where humidity levels are typically at their highest. As the year progresses, a clear trend emerges: after a mild start in January and February, humidity begins to rise significantly from March onward, peaking in the summer months of July and August. As the rainy season continues, September's levels remain elevated, reflecting the lush and tropical climate of this coastal city. However, as the year transitions into October and November, a gradual decline brings a more comfortable atmosphere, hinting at the changing seasons ahead.
In September, Sihanoukville experiences a UV Index of 14, maintaining an extreme exposure category that calls for heightened sun safety awareness. This steady index aligns with the trend observed in the preceding months of July and August, where the UV levels also peaked at 14. In fact, Sihanoukville's UV Index has consistently remained in the extreme category throughout the year, with a noteworthy high of 15 in March and April. Considering the persistent risk of skin damage, it is crucial for residents and visitors alike to prioritize protection against the sun during this time. For more detailed insights, check Sihanoukville UV Index.
UV Risk Categories
September in Sihanoukville, Cambodia, experiences 260 hours of sunshine, marking a gentle transition from the vibrant summer months. While this is a drop from the sun-drenched heights of March and April, which bask in 333 and 315 hours respectively, the sunshine in September is still ample for beachgoers and explorers. As the rainy season approaches in October, with only a slight increase to 265 hours, September offers a perfect balance of sunny days and refreshing breezes, making it an ideal time for those looking to avoid the peak tourist crowds while still enjoying the warm coastal charm of this beautiful destination. Overall, the trends show a steady abundance of sunlight throughout the year, peaking in the warmer months and providing opportunities for relaxation and adventure alike.
As summer fades, September in Sihanoukville, Cambodia, ushers in a significant drop in sunny days, with only an 8% chance of sunshine. This trend marks the beginning of a monsoon season characterized by increased rainfall and cloud cover. Following a long stretch of high temperatures, the chance for sun reaches an annual low, aligning with the months of August and July, which similarly offer little in the way of clear skies. Travelers seeking sunny beach days should consider visiting earlier in the year when the likelihood of sun peaks in February at 53%, ensuring brighter and more enjoyable outings.
In Sihanoukville, Cambodia, the month of September enjoys a delightful 12 hours of daylight, continuing a trend established in the summer months. This consistency reflects a pattern where daylight duration peaks between March and August, soaking the region in warm sunlight perfect for beach outings and exploration. As the year progresses towards October, daylight begins to taper off, retreating back to 11 hours. However, September stands out as a harmonizing point in the year, offering ample time for outdoor adventures and savoring the tropical atmosphere before the gradual shift toward shorter days.
As September rolls into Sihanoukville, Cambodia, the coastal breeze reaches an inviting average wind speed of 4.6 m/s (10 mph), mirroring the stronger gusts of August. This slight consistency amidst the seasonal transitions reveals a trend of increasing winds from the lower speeds seen earlier in the year. From January to May, gentle breezes typically hover around 3.1 m/s to 3.2 m/s (7-7.2 mph), but the months of June and July usher in a noticeable uptick, with wind speeds peaking at 5.4 m/s (12 mph). As the rainy season approaches, the winds calm a bit in October, dropping to 4.0 m/s (9 mph), but September remains an ideal time for enjoying the refreshing air along the pristine beaches. The overall pattern highlights a dynamic coastal environment where the gentle to moderate winds provide the perfect backdrop for beachgoers and water sports enthusiasts alike.
Weather in Sihanoukville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sihanoukville, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather experiences. In September, the temperatures range from a minimum of 25°C (78°F) to a maximum of 30°C (86°F), with an average of 27°C (81°F). This month is characterized by high humidity at 87% and significant rainfall, totaling 521 mm (20.5 in) over 27 days. Conversely, January boasts slightly cooler temperatures, with a minimum of 23°C (74°F) and a maximum of 31°C (87°F), while maintaining the same average of 27°C (81°F). However, this month is significantly drier, with only 50 mm (2.0 in) of precipitation over just 10 days and a lower humidity of 62%. For more detailed insights, check the Sihanoukville weather in January.
September experiences warmer temperatures with a minimum of 25°C and an average of 27°C, peaking at 30°C, while February maintains similar averages but can reach a higher maximum of 31°C. However, September is significantly wetter, receiving 521 mm of precipitation over 27 days, compared to February's much drier climate with only 36 mm over 10 days. Additionally, the humidity in September is notably higher at 87%, while February sees a more comfortable 61%. For a detailed breakdown of February's weather, you can visit Sihanoukville weather in February.
When comparing the weather in September and March, several notable differences emerge. September tends to be more humid and rainy, with an average temperature of 27°C (81°F) and a high of 30°C (86°F). The month experiences significant rainfall, totaling 521 mm (20.5 in) over 27 days, resulting in a humidity level of 87%. In contrast, March boasts slightly warmer temperatures, averaging 28°C (82°F) with a maximum of 31°C (89°F), but it is considerably drier, receiving only 59 mm (2.3 in) of precipitation across 17 days and a much lower humidity of 61%. For more detailed insights on March weather, you can visit Sihanoukville weather in March.
When comparing the weather in September and April, it's clear that both months experience warm temperatures, but with notable differences in precipitation and humidity. September boasts a min temperature of 25°C (78°F) and averages 27°C (81°F), peaking at a maximum of 30°C (86°F), while experiencing significantly higher rainfall at 521 mm (20.5 in) over 27 days, resulting in a high humidity level of 87%. In contrast, April features slightly warmer temperatures with a minimum of 24°C (76°F), an average of 28°C (83°F), and a maximum of 32°C (90°F). However, it sees only 116 mm (4.5 in) of precipitation over 21 days and maintains a lower humidity level of 67%. For a more detailed look at April's weather, you can check Sihanoukville weather in April.
In comparing the weather of September and May, we see that both months experience warm temperatures, but May is slightly warmer overall. September sees minimum temperatures of 25°C, averaging around 27°C, with a maximum of 30°C, while May has a minimum of 26°C, an average of 28°C, and peaks at 31°C. Rainfall is more prominent in September, with 521 mm of precipitation over 27 days, compared to May's 324 mm across 29 days. Additionally, September has a higher humidity level at 87%, contrasting with May's 78%. For a more detailed look at May weather specifics, check out Sihanoukville weather in May.
In comparing the weather between September and June, both months exhibit similar temperature ranges, with minimums around 25°C (78°F), maximums reaching 30°C (86°F), and average temperatures slightly higher in June at 28°C (83°F) compared to 27°C (81°F) in September. However, September is notably wetter, with 521 mm (20.5 in) of precipitation spread over 27 days, surpassing June’s 423 mm (16.6 in) during the same number of rainy days. The humidity levels are also marginally higher in September at 87% compared to June's 84%. For more specific details about the June climate, you can visit Sihanoukville weather in June.
In comparing the weather between July and September, both months display a similar temperature range, with minimum temperatures consistently around 25°C (78°F), average temperatures slightly varying between 27°C (81°F in September and 82°F in July), and maximums reaching up to 30°C (86°F) in both months. However, September experiences slightly less precipitation, with 521 mm (20.5 in) over 27 days compared to July's 568 mm (22.4 in) over 29 days. Additionally, humidity levels remain high in both months, with September at 87% and July at 86%. For more detailed information, you can check this link: Sihanoukville weather in July.
In comparing the weather of September and August, both months feature similar temperature ranges, with minimums at 25°C (78°F), averages at 27°C (81°F), and maximums at 30°C (86°F). However, September experiences slightly less precipitation at 521 mm (20.5 in), compared to August's 606 mm (23.9 in), making September a marginally drier month with 27 rainy days as opposed to 28 in August. Humidity levels are also slightly lower in September at 87%, compared to August's 88%. For more details, you can check Sihanoukville weather in August.
September and October exhibit similar average temperatures, with both months maintaining a minimum of around 25°C (77°F) and an average of 27°C (81°F). However, October sees a slight increase in maximum temperatures, reaching up to 31°C (88°F) compared to September’s maximum of 30°C (86°F). In terms of precipitation, October experiences a decrease to 430 mm (16.9 in) over 28 days, while September has a higher rainfall total of 521 mm (20.5 in) across 27 days. Humidity also slightly declines from September’s 87% to 84% in October, creating a somewhat drier atmosphere as the month progresses. For more details on October weather, you can check this link: Sihanoukville weather in October.
In September, the weather is characterized by a mix of warm temperatures and high humidity, with average temperatures ranging from a minimum of 25°C (78°F) to a maximum of 30°C (86°F). The month sees significant rainfall, accumulating to 521 mm (20.5 in) over 27 days, resulting in a rather damp atmosphere with humidity levels soaring at 87%.
In contrast, November experiences slightly warmer average temperatures, with a minimum of 25°C (77°F), an average of 28°C (82°F), and a maximum of 31°C (89°F). However, rainfall is substantially reduced to 151 mm (6.0 in) over 18 days, and humidity decreases to 84%. This makes November a relatively drier and more comfortable period compared to September. For more detailed information on the weather in Sihanoukville during November, you can check Sihanoukville weather in November.
In September, the weather is characterized by warmer temperatures, with minimums around 25°C (78°F) and maximums reaching 30°C (86°F), while December offers slightly cooler minimums at 23°C (73°F) and maximums peaking at 31°C (89°F). Precipitation is significantly higher in September, totaling 521 mm (20.5 in) over 27 days, compared to December's much lower 64 mm (2.5 in) over just 11 days. Additionally, humidity levels are higher in September at 87%, contrasting with December’s more comfortable 76%. For more detailed information, you can check Sihanoukville weather in December.
September in Sihanoukville brings a noticeable shift as it boasts higher humidity levels and significant rainfall compared to other months. With an average temperature of 27°C (81°F), this period is characterized by its tropical warmth, but the 21 days of precipitation and accumulated rainfall of 521 mm (20.5 in) make it one of the wettest months of the year. The lush landscapes come alive, but visitors should be prepared for the nearly daily showers. For those planning a trip, understanding the nuances of September's weather is essential. For a deeper dive into the region's climate, visit Sihanoukville Climate.