Last updated: August 21, 2025
In September, Ogasawara, Japan experiences a tropical climate marked by warm temperatures, with a maximum reaching 30°C (86°F) and an average of 28°C (82°F), while nights offer a milder 25°C (77°F). This month also sees a significant precipitation level of 181 mm (7.1 in), distributed over approximately 16 days, contributing to the region's lush greenery. With an average humidity of 85%, the air feels distinctly tropical, creating a vibrant yet humid atmosphere that characterizes Ogasawara's late summer scenery.
In September, Ogasawara, Japan, welcomes the late summer warmth with temperatures that maintain a pleasant balance, offering a minimum of 25°C (77°F), an average of 28°C (82°F), and a maximum of 30°C (86°F). This month marks a slight transition from the sweltering heat of August while still embracing the tropical vibe that characterizes the region. Notably, September’s temperatures reflect the tail end of the summer, where the humidity begins to ease slightly, inviting visitors to enjoy outdoor adventures amidst stunning natural landscapes. As autumn approaches, the days remain warm, making it an ideal time to explore the serene beauty of these islands before the cooler months settle in.
In September, Ogasawara, Japan, experiences some of its wettest weather, with precipitation totaling an impressive 181 mm (7.1 in), making it the second-highest month of the year. This surge in rainfall occurs over an average of 16 days, indicating a pattern of consistent, lighter showers rather than intense downpours. The increase in precipitation in September contrasts sharply with the drier months earlier in the year, such as February and July, which recorded only 37 mm (1.5 in) and 100 mm (3.9 in) respectively. This trend highlights the region's transition as it heads into the autumn months, ensuring the lush landscapes remain vibrant while likely impacting local activities and ecosystems.
In September, Ogasawara, Japan experiences a humidity level of 85%, slightly lower than the peak summer months but still indicative of a tropical climate. As the year progresses, humidity begins to trend downward from its high point in June at 93%, with a gradual decline marked by August’s 84% and October’s 82% just around the corner. The increasing humidity from January’s consistent 69% through to May’s 87% sets the stage for a lush, verdant environment typical of this picturesque archipelago. September’s levels reflect a lingering summer warmth, creating a cozy atmosphere before the gradual cool-down towards the end of the year.
In September, Ogasawara, Japan, continues to bask in intense sunlight, with a UV Index of 12, placing it firmly in the extreme exposure category. This trend of heightened UV levels has persisted throughout the summer months, with only slight fluctuations; July saw a peak of 13, while August dropped to 12. As September rolls in, beachgoers and outdoor enthusiasts should be particularly cautious, as the burn time remains a brief 10 minutes. With the approaching autumn, the UV index begins to taper off, heading towards a very high index of 10 in October. For detailed UV forecasts and safety tips, check out Ogasawara UV Index.
UV Risk Categories
As summer fades into autumn, September in Ogasawara, Japan, boasts a generous 309 hours of sunshine, making it one of the sunniest months of the year. Following the peak brightness of July, which recorded an impressive 342 hours, September maintains vibrant warmth, though slightly less intense than its preceding months of July and August with 327 hours. The gradual decrease in sunshine hours signals a transition toward fall, yet the lingering glow offers ample opportunity for outdoor adventures and explorations amidst the stunning natural beauty of the archipelago. This sunny embrace creates a delightful backdrop for visitors and residents alike, making September a splendid time to experience the charming islands before the cooler months set in.
As the summer fades into fall, the prospects for sunny weather in Ogasawara, Japan, during September remain quite promising, with a 46% chance of clear skies. This places September in a favorable position, especially following the peak sunlit month of August at 52%. Interestingly, September's likelihood of sunshine is on par with the months of October and notably higher than the winter months of January and February. The trend indicates a steady decline in sunny probabilities from the summer peak, yet September still offers a delightful balance of warmth and sunshine, making it an inviting time to experience the beauty of Ogasawara.
September in Ogasawara, Japan, ushers in a subtle transition as daylight duration recedes from the peak of summer. After enjoying a generous 13 hours of daylight throughout the warmer months of June, July, and August, the island experiences a gentle decline, settling at 12 hours of daylight in September. This gradual reduction signals the annual shift toward the shorter days of autumn, while still allowing for ample time to savor the vibrant landscapes and cultural richness that this tropical paradise offers. As October approaches with 11 hours of daylight, the rhythm of daylight mirrors the calming, reflective nature of the season, inviting residents and visitors alike to embrace a balance of outdoor adventures and cozy indoor experiences.
In Ogasawara, Japan, the September winds offer a gentle reprieve, with an average speed of 5.0 m/s (11 mph), marking a slight decline from the previous summer months. As the seasons shift, this decrease in wind speed reflects a broader trend of lighter breezes during the late summer, when the island often enjoys warmer temperatures and calmer conditions. Throughout the year, wind speeds fluctuate, peaking in January and October at 7.4 m/s (17 mph) and 8.2 m/s (18 mph) respectively, while the spring months exhibit brisker gusts that give way to the milder currents of late summer. This transition hints at the refreshing embrace of autumn just around the corner, inviting both locals and visitors to savor the tranquil atmosphere that September brings.
Weather in Ogasawara varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ogasawara, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is warm and humid, with average temperatures around 28°C (82°F) and high humidity levels of 85%. This month also sees significant rainfall, with precipitation measuring 181 mm (7.1 in) spread over 16 days. In contrast, January offers a cooler climate, with average temperatures dropping to 19°C (66°F) and much lower humidity at 69%. The rainfall is also reduced, with only 59 mm (2.3 in) of precipitation over 8 days. For more detailed information about the weather conditions in January, you can check Ogasawara weather in January.
September is characterized by warm temperatures, with an average reaching 28°C (82°F) and a high of 30°C (86°F). It experiences significant rainfall, accumulating 181 mm (7.1 in) over 16 days, accompanied by high humidity levels at 85%. In contrast, February presents much cooler weather, with an average temperature of 18°C (65°F) and a maximum of 23°C (73°F). Precipitation is notably lower in February, totaling only 37 mm (1.5 in) across 6 days, and humidity decreases to 69%. This stark difference in weather between the two months highlights the transition from the warm, wet conditions of September to the cooler, drier climate of February. For more detailed information about February's climate, check out Ogasawara weather in February.
September and March present contrasting weather conditions. In September, temperatures are notably warmer, with minimums around 25°C (77°F) and averages reaching 28°C (82°F), making it feel quite tropical. This month also sees a significant amount of rainfall, averaging 181 mm (7.1 in) over 16 days and high humidity levels at 85%. In contrast, March offers a much cooler climate, with minimum temperatures dropping to 15°C (59°F) and averages around 20°C (68°F). Precipitation is less frequent in March, totaling 69 mm (2.7 in) over just 9 days, accompanied by a lower humidity of 74%. For a more detailed overview of the weather in March, you can explore Ogasawara weather in March.
In September, the weather tends to be hotter and more humid compared to April, with temperatures averaging around 28°C (82°F) and reaching a maximum of 30°C (86°F). In contrast, April offers a milder climate, with average temperatures of 21°C (70°F) and highs of 25°C (77°F). September also experiences significantly more precipitation, totaling 181 mm (7.1 in) over 16 days, while April sees only 94 mm (3.7 in) across 9 days. The humidity is slightly higher in September at 85% compared to April's 81%, contributing to a more oppressive feel during the late summer month. For more details on April weather conditions, you can check Ogasawara weather in April.
In comparing the weather of September and May, September tends to be warmer, with average temperatures ranging from 25°C (77°F) to a maximum of 30°C (86°F), compared to May's cooler range of 18°C (65°F) to 27°C (81°F). Both months experience significant rainfall, with September receiving 181 mm (7.1 in) over 16 days, slightly more than May’s 178 mm (7.0 in) over just 12 days. Humidity levels are relatively high in both months, with September at 85% and May slightly higher at 87%. Overall, while both months are moist and warm, September is noticeably hotter. For more details on May weather, check Ogasawara weather in May.
In comparing the weather between September and June, September tends to be slightly warmer, with average temperatures reaching 28°C (82°F) and maximum highs of 30°C (86°F), compared to June's average of 26°C (79°F) and maximum of 28°C (83°F). However, June experiences a higher humidity level at 93%, which makes the warmth feel more intense, whereas September has a humidity of 85%. Additionally, September sees more rainfall with 181 mm (7.1 in) spread across 16 days, while June receives 166 mm (6.5 in) over 13 days. For more specifics on June weather, you can refer to Ogasawara weather in June.
In comparing the weather between September and July, both months experience warm temperatures, but September tends to be slightly warmer, with an average of 28°C (82°F) compared to July's average of 27°C (81°F). Additionally, September sees higher maximum temperatures, reaching up to 30°C (86°F), while July peaks at 29°C (85°F). Precipitation is notably greater in September, totaling 181 mm (7.1 in) over 16 days, compared to July's 100 mm (3.9 in) over 14 days. Humidity levels also remain high in both months, with September averaging 85% and July at 88%. For more detailed insights into weather patterns, you can check Ogasawara weather in July.
In September, the weather is slightly warmer, with minimum temperatures reaching 25°C (77°F) and maximums peaking at 30°C (86°F). The month also sees a significant increase in precipitation, totaling 181 mm (7.1 in) over 16 days, contributing to a high humidity level of 85%. In contrast, August experiences a minimum temperature of 26°C (79°F) and a maximum of 29°C (85°F), with much less rain, accumulating only 93 mm (3.7 in) over 13 days and a humidity level of 84%. Overall, September tends to be wetter and a bit warmer, while August remains relatively dry and slightly cooler. For a closer look at August weather specifics, visit Ogasawara weather in August.
In September, the weather is characterized by warmer temperatures, with a minimum of 25°C (77°F) and an average of 28°C (82°F), peaking at 30°C (86°F). The month also sees significant rainfall, with a total of 181 mm (7.1 in) spread over 16 days, accompanied by high humidity at 85%. In contrast, October experiences slightly cooler temperatures, with minimums dropping to 21°C (71°F) and an average of 27°C (81°F), while the maximum reaches 29°C (85°F). Although October has a lower total precipitation of 158 mm (6.2 in) across 19 days, humidity remains fairly high at 82%. For more details, you can check Ogasawara weather in October.
September typically boasts warmer temperatures compared to November, with minimums around 25°C (77°F) and averages reaching up to 28°C (82°F). In contrast, November sees cooler temperatures, with a minimum of 19°C (67°F) and an average of 24°C (76°F). While September experiences more rainfall, totaling 181 mm (7.1 in) across 16 days, November has a lower precipitation level of 131 mm (5.1 in) over 14 days. Additionally, the humidity in September is higher at 85%, compared to November's 80%. For more detailed insights, you can explore Ogasawara weather in November.
In September, the weather is warm and humid, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 30°C (86°F) and an average temperature of 28°C (82°F). The month experiences considerable rainfall, averaging 181 mm (7.1 in) over 16 days, contributing to a high humidity level of 85%. In contrast, December brings a cooler climate, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 26°C (78°F) and an average of 22°C (71°F). Precipitation decreases to 167 mm (6.6 in) over 11 days, and humidity drops to 75%. For more details on the December weather, check out Ogasawara weather in December.
As September rolls into Ogasawara, the weather shifts to a warm embrace with average temperatures hovering around 28°C (82°F), creating a tropical ambiance. This month stands out with increased humidity at 85%, making it feel particularly rich and lush, while rainfall is also more frequent, totaling 181 mm over 16 days. This contrasts with the drier and slightly cooler months preceding it, as September becomes a bridge into the vibrant, lush part of the year. For those looking to explore more about Ogasawara's unique weather patterns, delve deeper into Ogasawara Climate.