Oshima Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Oshima.
Climate overview of Oshima
Temperatures in Oshima, Tokyo Prefecture, Japan, vary greatly throughout the year. August is the hottest month at 28°C (82°F), while January is the coldest at 12°C (54°F).
Rainfall is high, totalling around 2191 mm (86 in) per year. June is the wettest month and December the driest. The city also experiences a distinct rainy season from March to July, with warm summers and mild winters.
Oshima Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Oshima - and find the best time to visit.
Monthly Temperature in Oshima
The climate in Oshima is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 28°C (82°F) in August, the warmest time of the year, to a moderate 12°C (54°F) during cooler months like January.
At night, you can expect temperatures ranging from 25°C (77°F) in August to around 8°C (46°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Oshima
Oshima has a notably wet climate with abundant precipitation, recording 2191 mm (86 in) of rainfall per year. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives heavy rainfall, averaging 276 mm (11 in) of precipitation, recorded across 20 rainy days. In contrast, the driest month December brings less rainfall, with 107 mm (4.2 in) over 12 rainy days. For more details, please visit our Oshima Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Oshima
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: August
- Warmest weather: July, August and September
- Fewest rainy days: January, November and December
- Seasonal pattern: A distinct rainy season from March to July, with warm summers and mild winters
Frequently asked questions about the climate in Oshima
What is the best time to visit Oshima?
August typically offers the most optimal weather in Oshima. In contrast, January, February, March, June and October tend to have less optimal conditions. Oshima has a distinct rainy season from March to July, with warm summers and mild winters.
What temperatures can I expect in Oshima?
Daytime highs range from 12°C (54°F) in January to 28°C (82°F) in August. Nighttime lows range from 8°C (46°F) to 25°C (77°F). Temperatures vary considerably through the year.
How much rain does Oshima get?
Annual rainfall is around 2191 mm (86 in). June is the wettest month with 276 mm (11 in), while December is the driest with 107 mm (4.2 in).
Oshima 3-Day Forecast
Oshima on the map
Oshima is highlighted - select any city to see its climate.
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