Last updated: August 21, 2025
In January, Oshima, Japan experiences a cool climate, characterized by a maximum temperature of 18°C (65°F) and a minimum temperature of 2°C (36°F), averaging around 10°C (50°F). Visitors should prepare for a moderate amount of rainfall, with 91 mm (3.6 in) of precipitation spread across 9 days during the month. The island's humidity level hovers around 76%, contributing to its crisp, refreshing air. Whether you’re exploring the lush landscapes or enjoying indoor activities, January in Oshima offers a unique blend of chilly weather and scenic beauty.
In Oshima, Japan, January ushers in the new year with a chill, featuring minimum temperatures around 2°C (36°F) and averages settling at 10°C (50°F), culminating in maximums of 18°C (65°F). This month marks the beginning of a gentle warming trend, as the island transitions from winter to spring. Notably, temperatures gradually rise by February, maintaining an average of 10°C while inching towards a max of 19°C (66°F). This pattern of slight increases continues into March, where daytime warmth reaches 19°C (66°F). By mid-spring, temperatures climb more noticeably, demonstrating Oshima’s delightful shift from winter's mild grip to the rosy embrace of spring, setting the stage for blossoming landscapes and rising visitor numbers.
In January, Oshima experiences a moderate rainfall of 91 mm (3.6 in) over approximately 9 days, setting the tone for the wetter months ahead. Following closely is February, with a slightly reduced precipitation of 89 mm (3.5 in) but an increase in rainy days to 11. As spring approaches, March sees a significant uptick in precipitation, reaching 201 mm (7.9 in) over 14 days, emphasizing the transition into a more rain-drenched season. The trend continues through late spring and summer, peaking in July with 301 mm (11.9 in) spread across 15 days. While January serves as a precursor to this wetter pattern, it stands out for its relatively lower rainfall, hinting at the dramatic shifts in weather that characterize Oshima's climate as the year unfolds.
In Oshima, Japan, January ushers in a humidity level of 76%, setting the tone for the wetter months ahead. As winter gives way to spring, February sees a slight dip to 74%, but March reveals a trend toward drier air with humidity falling to 70%. However, as the landscape warms in April, humidity levels rise back to 74%. The real shift is felt in May, with a significant spike to 81%, signaling the onset of the rainy season. By June, the air becomes noticeably more humid at 88%, peaking in July with a staggering 93%. Following this, the humidity remains high through August at 90%, then gradually declines through the fall, landing at 83% in October and 80% in November, before closing the year at 78% in December. This pattern reflects a dynamic interplay of seasonal changes, with the island’s humidity reaching its zenith in the heart of summer while showing a gentle descent as autumn approaches.
In January, Oshima experiences a moderate UV Index of 4, indicating a burn time of 30 minutes for unprotected skin. This trend of moderate exposure continues into February with a slight increase to UV Index 5, maintaining the same burn time. However, as spring approaches, the UV Index escalates sharply, reaching 8 in March and soaring to 10 by April, where the burn time drops to just 15 minutes. The peak of summer sees the extreme UV conditions take hold, with values peaking at 12 in July, while maintaining this high level into August. Following the summer, the UV Index gradually decreases, settling at 10 in September and tapering back to 5 in November, before returning to its starting point of 4 in December. This progression underscores the significant seasonal variation in UV exposure on the island. For detailed insights and precautions to take throughout the year, visit Oshima UV Index.
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In Oshima, Japan, January marks the beginning of the year with a modest 189 hours of sunshine, setting a tranquil tone as the days gradually lengthen. As winter gives way to spring, the sunlight steadily increases—February brings 228 hours, followed by 260 hours in March, hinting at the vibrant blooms to come. By April, the sunshine reaches 276 hours, ushering in the full splendor of spring, which reaches its zenith in May with an impressive 293 hours. However, as summer arrives, the hours of sunshine display a more dynamic rhythm, peaking in August at 313 hours before tapering off into autumn. The months that follow demonstrate a gentle decline, showcasing 254 hours in September and settling into 216 hours by October. Despite these fluctuations, Oshima’s annual sunshine pattern illustrates a clear journey from the quiet light of winter to the exuberant brightness of summer, concluding with a comforting embrace of the cooler seasons.
In Oshima, Japan, January boasts a 54% chance of sunny weather, making it a promising start to the year. This slight dip in sunshine likelihood compared to February's 63% indicates a gradual shift towards clearer skies as winter yields to early spring. Throughout the coming months, the probability of sunny days fluctuates, with a notable decrease in the summer months, where sun chances drop further to 25% in June and 27% in May. Interestingly, while late fall offers a much sunnier disposition with 58% in November and culminating in a bright 68% in December, January still stands as an inviting time for those looking to bask in Oshima's winter sun. The diverse weather patterns throughout the year highlight January as a sweet spot for experiencing a balance of clear days and invigorating winter air.
In Oshima, Japan, January welcomes the year with 10 hours of daylight, a trend that continues into February. As spring approaches in March, daylight begins to increase, stretching to 11 hours by the month's end. The transition into April ushers in longer days, basking in up to 13 hours of daylight, a duration that remains steady through May. The sun reaches its zenith in June and July, with 14 hours of radiant daylight, allowing for ample time to enjoy the outdoors. As summer wanes into August, daylight gradually declines to 13 hours, followed by a gentle tapering off in September at 12 hours. By October, daylight recedes to 11 hours, effectively signaling the onset of autumn. The shorter days continue into November with 10 hours and culminate in December, where only 9 hours of daylight bid farewell to the year. This cyclical pattern illustrates the harmonious rhythm of the seasons in Oshima, where daylight shapes the beauty and activities of each month.
In Oshima, Japan, January greets residents and visitors with brisk winds, featuring an average speed of 9.3 m/s (21 mph). This marks the beginning of a slightly higher wind season, as February closely follows with an average of 9.4 m/s (21 mph). However, as winter transitions into spring, we see a notable decline in wind speeds, dropping to 7.0 m/s (16 mph) by March and continuing to hover around the low to mid 7s m/s range through April and May. By June, the winds soften considerably to 5.0 m/s (11 mph), marking a calm summer period, before gradually increasing again in the latter part of the year—where November’s winds pick up to 7.9 m/s (18 mph) and December returns to nearly January’s brisk pace at 9.2 m/s (21 mph). This yearly rhythm highlights a clear pattern: January and February's strong winds transition to a gentle summer breeze, only to regain strength as autumn approaches.
Weather in Oshima varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Oshima, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, temperatures typically range from a minimum of 2°C (36°F) to a maximum of 18°C (65°F), with an average of 10°C (50°F). The month sees about 91 mm (3.6 in) of precipitation over 9 days, coupled with a humidity level of 76%. In contrast, February experiences slightly warmer temperatures, with a minimum of 4°C (39°F) and a maximum of 19°C (66°F), while maintaining the same average of 10°C (50°F). Precipitation is slightly lower at 89 mm (3.5 in), but it occurs over a slightly longer period of 11 days, and humidity drops to 74%. For those looking for more detailed weather information, visit Oshima weather in February.
In January, the weather tends to be cooler with an average temperature of 10°C (50°F) and a maximum of 18°C (65°F), while March sees a slight increase in temperatures, averaging 13°C (55°F) with a maximum of 19°C (66°F). January experiences about 91 mm (3.6 in) of precipitation over 9 days, which is notably less than March's 201 mm (7.9 in) over 14 days, indicating a wetter month. Additionally, January has a higher humidity level at 76%, compared to March’s 70%, making the early winter month feel a bit more damp. For a more detailed look at what to expect in March, check out Oshima weather in March.
January weather is characterized by cooler temperatures, with minimums around 2°C (36°F) and maximums reaching up to 18°C (65°F). The month averages a moderate 10°C (50°F) and experiences precipitation on about 9 days, totaling 91 mm (3.6 in) and accompanied by a relatively high humidity of 76%. In contrast, April sees a warmer climate, with minimum temperatures rising to 7°C (46°F) and maximums reaching 21°C (71°F). The average temperature in April is 15°C (59°F), but it comes with increased rainfall, totaling 157 mm (6.2 in) over 12 days, while humidity slightly decreases to 74%. For more details on the weather in April, you can visit Oshima weather in April.
January and May showcase notably different weather patterns. In January, temperatures range from a chilly minimum of 2°C (36°F) to a comfortable maximum of 18°C (65°F), with an average of 10°C (50°F). The month experiences about 91 mm (3.6 in) of precipitation over 9 days, accompanied by a humidity level of 76%. In contrast, May sees a significant rise in temperatures, with a minimum of 13°C (56°F) and a maximum of 23°C (73°F), averaging at 19°C (66°F). However, it also brings heavier rainfall, totaling 198 mm (7.8 in) across 11 days and a humidity level of 81%. For a deeper look into May's conditions, you can check Oshima weather in May.
In January, Oshima experiences relatively mild temperatures, with a minimum of 2°C (36°F) and an average of 10°C (50°F). The maximum temperature reaches around 18°C (65°F), accompanied by moderate precipitation of 91 mm (3.6 in) over 9 days, and humidity levels hover around 76%. In contrast, June brings significantly warmer weather, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 25°C (78°F), leading to an average of 22°C (71°F). However, June is also the wettest month with 277 mm (10.9 in) of precipitation falling over 14 days and heightened humidity at 88%. For more details, you can check Oshima weather in June.
January and July present striking contrasts in weather patterns. In January, temperatures range from a mild 2°C (36°F) at night to a pleasant 18°C (65°F) during the day, with an average of 10°C (50°F). However, this month experiences significant rainfall, totaling 91 mm (3.6 in) over about 9 days, coupled with a relative humidity of 76%, creating a cool and damp atmosphere.
In contrast, July warms up considerably, with nighttime lows of 20°C (69°F) and daytime highs averaging around 29°C (85°F). The month is wetter, with precipitation soaring to 301 mm (11.9 in) across approximately 15 days, and humidity levels rise to a steamy 93%. The weather in July tends to be more oppressive due to the combination of higher temperatures and increased rainfall, characteristic of summer in the region. For a detailed look at July weather patterns, you can check this link: Oshima weather in July.
In January, the weather is quite cool, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 18°C (65°F) and an average of around 10°C (50°F). The month experiences frequent rainfall, with about 91 mm (3.6 in) of precipitation over nine days, accompanied by a humidity level of 76%. In contrast, August brings warm and humid conditions, with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 29°C (85°F) and an average of 27°C (80°F). The summer month sees higher precipitation levels at 155 mm (6.1 in) across 13 days, alongside increased humidity at 90%. For more details about the weather during this month, check out Oshima weather in August.
January and September showcase a stark contrast in weather conditions. In January, temperatures range from a chilly 2°C (36°F) at night to a mild 18°C (65°F) during the day, with an average of 10°C (50°F). This month experiences moderate rainfall, totaling 91 mm (3.6 in) over about 9 days, accompanied by a humidity level of 76%.
Conversely, September brings much warmer temperatures, with minimums of 19°C (67°F) and maximums peaking at 29°C (84°F), averaging 25°C (76°F). The month is also marked by significantly higher precipitation, with 249 mm (9.8 in) spread across 19 days and a humidity level of 86%. For more detailed information, you can visit Oshima weather in September.
January weather is markedly cooler than October, 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). The month sees about 91 mm (3.6 in) of precipitation spread over 9 days, coupled with a humidity level of 76%. In contrast, October enjoys milder temperatures, with minimums around 15°C (59°F) and maximums reaching 27°C (80°F), averaging at 21°C (70°F). However, this month experiences much higher precipitation at 339 mm (13.4 in) over 18 days, along with a slightly elevated humidity of 83%. For more detailed information on October weather, you can visit Oshima weather in October.
In comparison between January and November, January presents cooler temperatures, with an average of 10°C (50°F), while November enjoys a milder average of 17°C (63°F). The maximum temperature in January reaches only 18°C (65°F), in contrast to November's higher maximum of 23°C (73°F). Precipitation levels also differ significantly; January experiences 91 mm (3.6 in) over 9 days, whereas November sees an increased rainfall of 152 mm (6.0 in) across 15 days. Additionally, November's humidity is slightly higher at 80% compared to January's 76%. For more details on what to expect, check out Oshima weather in November.
In January, the weather tends to be cooler compared to December, with average temperatures ranging from a minimum of 2°C (36°F) to a maximum of 18°C (65°F). In contrast, December experiences slightly milder conditions, with temperatures varying from a minimum of 5°C (41°F) to a maximum of 21°C (71°F). Precipitation levels are similar for both months, with January receiving 91 mm (3.6 in) over 9 days and December seeing slightly higher rainfall at 95 mm (3.7 in) over 12 days. Additionally, January's humidity averages around 76%, while December is marginally higher at 78%. For more details on December weather, you can visit Oshima weather in December.
As January unfolds on Oshima, the weather offers a distinct contrast to the milder seasons that precede and follow it. With temperatures dipping to a crisp average of 10°C (50°F) and a notable increase in precipitation, this month is characterized by cooler days and a higher likelihood of rain, counting up to nine wet days. The island’s humidity also reaches 76%, adding to the overall cool and damp atmosphere. This chilly climate invites visitors and locals alike to embrace cozy indoor activities and enjoy the unique beauty of Oshima in winter. For more insights into how January weather compares to other months, explore the detailed statistics on Oshima Climate.