Last updated: August 21, 2025
In Oshima, Japan, August is characterized by a warm and humid climate, with average temperatures hovering around 27°C (80°F), peaking at a maximum of 29°C (85°F) and rarely dipping below 22°C (72°F). This month also brings considerable rainfall, with an average precipitation total of 155 mm (6.1 in) spread over 13 days, contributing to an overall humidity level of 90%. Visitors should be prepared for a tropical experience, balancing warm weather with frequent showers—perfect for exploring the lush landscapes and vibrant culture of this beautiful island.
In August, Oshima, Japan, experiences its warmest temperatures of the year, with minimums averaging around 22°C (72°F) and maximums reaching up to 29°C (85°F). The peak average temperature of 27°C (80°F) creates a vibrant atmosphere perfect for summer activities and enjoying the lush natural landscapes. This month marks a significant leap from the cooler temperatures of earlier months, notably transitioned from a comfortable average of 25°C (77°F) in July. As summer winds down into September, a slight cooling trend begins, yet August remains a highlight for locals and visitors alike, offering the perfect mix of warmth and leisure under the sun.
August in Oshima, Japan experiences an average precipitation of 155 mm (6.1 in), marking a notable decline compared to the torrential rains of July. With rainfall spread across 13 days, August maintains a balance, allowing for respite after the peak monsoon season in July, which recorded 301 mm (11.9 in) over 15 days. This dip in precipitation continues a trend of variable rainfall throughout the summer, as June and July saw significantly higher amounts, peaking at 277 mm (10.9 in) and 301 mm respectively. Interestingly, following August, September ramps up again, with 249 mm (9.8 in) anticipated over 19 days, indicating that while August provides a brief pause in heavy rains, the patterns of fluctuating precipitation remain a defining characteristic of Oshima's climate.
Oshima, Japan experiences significant fluctuations in humidity throughout the year, with August typically registering at 90%. This high level, while slightly lower than the peak of 93% observed in July, still places it among the most humid months of the year. As the summer progresses, humidity levels rise steadily from 70% in March to a peak in July, creating a muggy atmosphere that characterizes the peak of the warm season. Following August, humidity begins to taper off, dropping to 86% in September and continuing downwards into the fall months. Overall, the data reveals a trend of increasing humidity from early spring through summer, culminating in the moisture-laden month of August before a gradual decline into the more temperate autumn.
In August, Oshima, Japan, experiences an extreme UV Index of 11, mirroring the intensity of the previous month, July. This consistent high level means residents and visitors alike should remain vigilant, as the recommended burn time is just 10 minutes under direct sunlight. Comparatively, the UV exposure trends show a gradual increase from moderate levels in January and February, escalating to very high by March and April, before peaking in the summer months. As summer progresses, the UV Index remains elevated, transitioning to very high again in September. It's crucial to stay informed about UV levels and take proactive sun safety measures. For detailed insights, check out the Oshima UV Index.
UV Risk Categories
In August, Oshima, Japan, basks in an impressive 313 hours of sunshine, marking it as the sunniest month of the year. This peak follows a gradual increase from the 189 hours recorded in January, as the days lengthen and temperatures rise. The transition from winter to summer reveals a consistent upward trend, with each month building on the last—most notably, between May and August, where sunshine hours leap from 293 to 313. Even as the season shifts toward autumn, September still enjoys a generous 254 hours, showcasing that Oshima's vibrant summer radiance lingers a little longer before giving way to the cooler months. The overall pattern illustrates a clear seasonal rhythm, delighting sun-seekers and nature enthusiasts alike.
In Oshima, Japan, August brings a 39% chance of sunny weather, which remains consistent with the slightly more promising conditions of July. While the summer months generally see lower probabilities for bright, sun-filled days compared to the earlier months of the year, August stands out as a transitional period. Interestingly, the likelihood of sunny weather starts to pick up again in September, hinting at a gradual return to brighter days as the summer wanes. Despite the average sun chances, August still offers opportunities for outdoor enjoyment, inviting visitors to bask in the warmth of the season, albeit with a cautious eye on the occasional cloud cover.
In Oshima, Japan, the sunshine hours exhibit a captivating rhythm throughout the year, peaking during the warmer months. By August, the region enjoys about 13 hours of daylight, a slight decline from the 14 hours experienced in the height of summer in June and July. As summer transitions toward autumn, daylight begins to gradually wane, with September following suit at 12 hours. This seasonal variance not only illustrates the shifting balance between sunlight and twilight but also invites residents and visitors alike to savor the lingering warmth and plentiful daylight before the shorter days of fall set in.
In Oshima, Japan, the August winds bring a refreshing shift, whipping through at an average speed of 6.8 m/s (15 mph). While the summer months of June and July experience a lull with winds clocking in at a gentle 5.0 m/s (11 mph), August marks a resurgence in breeziness as it transitions towards the more dynamic autumn months. Following August, winds pick up intensity in September and November, reaching 7.4 m/s (17 mph) and 7.9 m/s (18 mph), respectively, creating a natural rhythm in the island's climate. Interestingly, the year kicks off with stronger gusts, peaking in January at 9.3 m/s (21 mph), then tapering off into the lighter breezes of late summer. This pattern showcases a fascinating interplay between seasonal changes and wind dynamics, making Oshima a captivating destination for weather enthusiasts.
Weather in Oshima varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Oshima, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January present contrasting weather conditions. In August, temperatures are notably warmer, ranging from a minimum of 22°C (72°F) to a maximum of 29°C (85°F), with an average of 27°C (80°F). This month also sees significant rainfall, with about 155 mm (6.1 in) of precipitation over 13 days, accompanied by high humidity levels of 90%. Conversely, January is much cooler, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 18°C (65°F) and an average of 10°C (50°F). Precipitation is less frequent, totaling 91 mm (3.6 in) over just 9 days, and the humidity is lower at 76%. For more specific details about January weather, you can check Oshima weather in January.
When comparing the weather in August and February, distinct differences in temperature and humidity emerge. August boasts warmer temperatures, with a minimum of 22°C (72°F) and an average of 27°C (80°F), peaking at 29°C (85°F). In contrast, February's temperatures range from a chilly minimum of 4°C (39°F) to a maximum of 19°C (66°F), yielding a much cooler average of 10°C (50°F). Additionally, August experiences higher humidity at 90% and significantly more precipitation, accumulating 155 mm (6.1 in) over 13 days, while February sees 89 mm (3.5 in) spread across 11 days with a lower humidity of 74%. For a closer look at February weather specifics, you can check Oshima weather in February.
In August, the weather is distinctly warm and humid, with average temperatures around 27°C (80°F) and daily highs reaching up to 29°C (85°F). The month sees considerable rainfall, averaging 155 mm (6.1 in) over about 13 days, creating a muggy atmosphere with humidity levels peaking at 90%. In contrast, March offers a cooler climate, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 19°C (66°F) and an average of 13°C (55°F). Although March experiences slightly more precipitation, totaling 201 mm (7.9 in) over 14 days, the humidity is lower at 70%, making it feel fresher compared to the sweltering August conditions. For more details on March weather, visit Oshima weather in March.
When comparing the weather in August and April, notable differences emerge in temperature, precipitation, and humidity. August typically features higher temperatures, with averages around 27°C (80°F) and maximums reaching up to 29°C (85°F), while April sees much cooler temperatures, averaging 15°C (59°F) and peaking at 21°C (71°F). Both months experience significant rainfall, with April slightly edging out August in total precipitation at 157 mm (6.2 in) compared to August's 155 mm (6.1 in). However, April has a lower humidity level of 74%, contrasted with August's high humidity at 90%. For a detailed look at April's conditions, you can check Oshima weather in April.
In comparing the weather of August and May, August generally offers warmer temperatures, with a minimum of 22°C and an average of 27°C, peaking at 29°C. In contrast, May is notably cooler, featuring a minimum of 13°C, an average of 19°C, and a maximum of 23°C. Although August has lower precipitation levels at 155 mm across 13 days, it has a higher humidity of 90%, while May experiences slightly more rain at 198 mm over just 11 days, with a humidity level of 81%. For a detailed look at May's weather, you can visit Oshima weather in May.
When comparing the weather in August to that of June, we notice significant differences in temperature and precipitation patterns. August typically features warmer temperatures, with a minimum of 22°C (72°F) and an average of 27°C (80°F), peaking at 29°C (85°F). In contrast, June is cooler, with a minimum of 17°C (63°F) and an average of 22°C (71°F), reaching a maximum of only 25°C (78°F).
In terms of precipitation, June experiences more rainfall, with a total of 277 mm (10.9 in) over 14 days, while August sees less rain, accumulating 155 mm (6.1 in) across 13 days. However, both months maintain high humidity levels, with August at 90% and June at 88%. For a more detailed look at June weather in Oshima, you can check Oshima weather in June.
In comparing the weather between July and August, August tends to be slightly warmer, with an average temperature of 27°C (80°F) compared to July's 25°C (77°F). Both months share the same maximum temperature of 29°C (85°F), but July experiences a lower minimum temperature of 20°C (69°F) versus August's 22°C (72°F). However, July receives significantly more rainfall, with 301 mm (11.9 in) over 15 days, compared to August's 155 mm (6.1 in) over 13 days. Humidity levels are also a bit higher in July at 93%, while August sees a relative humidity of 90%. For a more detailed look at July weather, you can check Oshima weather in July.
August weather typically features warmer temperatures, with an average of 27°C (80°F) and humidity reaching a high of 90%. It also experiences significant rainfall, totaling around 155 mm (6.1 in) over 13 days. In contrast, September sees a slight decrease in the minimum temperature to 19°C (67°F) and an average of 25°C (76°F). However, it experiences increased precipitation of 249 mm (9.8 in) across 19 days, accompanied by a slightly lower humidity level of 86%. For more detailed information, you can check Oshima weather in September.
August and October present distinct contrasts in weather patterns. August is typically warmer, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 29°C (85°F), accompanied by high humidity levels of 90%. However, it experiences considerable rainfall, with around 155 mm (6.1 in) of precipitation over approximately 13 days. In contrast, October brings cooler temperatures, with an average ranging from 15°C (59°F) to 27°C (80°F). The month is notably wetter, with a significant increase in precipitation to 339 mm (13.4 in) over about 18 days, albeit with a lower humidity of 83%. For more detailed information about October weather, you can visit Oshima weather in October.
August and November present contrasting weather patterns. In August, temperatures average around 27°C (80°F) with highs reaching 29°C (85°F) and a notably high humidity level of 90%. This month also experiences substantial rainfall, with 155 mm (6.1 in) spread over 13 days. In contrast, November brings a much cooler climate, with average temperatures dropping to 17°C (63°F) and maximums of 23°C (73°F). While precipitation is slightly lower at 152 mm (6.0 in), it occurs over more days, totaling 15. The humidity in November is also less oppressive at 80%, making it a more comfortable month overall. For more specific details, you can check Oshima weather in November.
August and December present stark contrasts in weather patterns. In August, temperatures range from a minimum of 22°C (72°F) to a maximum of 29°C (85°F), with an average of 27°C (80°F), creating a warm and humid environment with high humidity levels at 90%. This month also sees considerable rainfall, totaling 155 mm (6.1 in) across 13 days. In contrast, December is much cooler, with temperatures ranging from a chilly 5°C (41°F) to a mild 21°C (71°F), averaging around 12°C (55°F). Precipitation is lower in December, totaling 95 mm (3.7 in) over 12 days, and the humidity drops to 78%. For more detailed information, you can check Oshima weather in December.
In August, Oshima experiences its warmest weather of the year, characterized by high humidity levels that can make the temperatures feel even more intense. The month is marked by frequent rainfall, with a notable number of precipitation days, which adds to the lush, tropical atmosphere of the island. Unlike the cooler months, August's climate is a perfect blend of warmth and moisture, making it ideal for enjoying outdoor activities while also preparing for sudden showers. For a more detailed look at Oshima's climate patterns throughout the year, visit Oshima Climate.