Izu Oshima weather by month & the best time to visit
🇯🇵 Japan · major coastal city · humid subtropical climate
The best time to visit Izu Oshima is May — its sunniest month (Sunshine Score 62/100), with June and July close behind. Izu Oshima averages about 1,871 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 175 mm of rain in May.
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- Sun hours / year
- 1,871
- Sunniest month
- May
- Peak score
- 62/100
- Rain / year
- 1,946 mm
- Midday UV at peak
- 8 (very high)
- Sea at warmest
- 30°C / 86°F
- Population
- 3.8M
- Elevation
- 35 m
When is the best time to visit Izu Oshima?
For sunshine, the best time to visit Izu Oshima is May, then June and July. The dullest month is February (18/100, 92 mm of rain). The full month-by-month picture is in the table below.
How sunny is Izu Oshima?
Izu Oshima gets a moderate 1,871 hours of sunshine a year. May (62/100) is noticeably better than February (18). It ranks #18 of 79 destinations in Japan for annual sunshine, above the national median of 1,773 hours. The year's 1,946 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 19 | 11° / 52°F | 7° / 45°F | 84 mm | 2 | 20° / 68°F |
| February | 18 | 11° / 52°F | 7° / 45°F | 92 mm | 3 | 19° / 66°F |
| March | 31 | 14° / 57°F | 9° / 48°F | 146 mm | 4 | 18° / 64°F |
| April | 47 | 17° / 63°F | 13° / 55°F | 163 mm | 5 | 20° / 68°F |
| May | 62 | 20° / 68°F | 17° / 63°F | 175 mm | 6 | 21° / 70°F |
| June | 62 | 23° / 73°F | 20° / 68°F | 225 mm | 6 | 24° / 75°F |
| July | 62 | 26° / 79°F | 23° / 73°F | 201 mm | 7 | 27° / 81°F |
| August | 62 | 28° / 82°F | 25° / 77°F | 160 mm | 8 | 30° / 86°F |
| September | 62 | 26° / 79°F | 23° / 73°F | 233 mm | 6 | 29° / 84°F |
| October | 62 | 22° / 72°F | 18° / 64°F | 251 mm | 4 | 27° / 81°F |
| November | 55 | 18° / 64°F | 14° / 57°F | 127 mm | 3 | 24° / 75°F |
| December | 31 | 13° / 55°F | 9° / 48°F | 89 mm | 2 | 21° / 70°F |
Sea temperature in Izu Oshima by month
The sea off Izu Oshima is warmest in August at around 30°C / 86°F, and coolest in March at 18°C / 64°F. The water sits at a comfortable 21°C or warmer roughly 8 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Izu Oshima on the interactive sunshine globe →
Nearby places for sunshine
- Tokyo Japan · 94 km · best in Aug · 1,958 h sun/yr
- Shizuoka Japan · 107 km · best in May · 2,035 h sun/yr
- Ibaraki Japan · 183 km · best in May · 1,948 h sun/yr
- Nagoya Japan · 233 km · best in May · 1,906 h sun/yr
- Toyama Japan · 286 km · best in May · 1,590 h sun/yr
- Kanazawa Japan · 322 km · best in Jun · 1,565 h sun/yr
Nearest destinations
- Miyakejima Japan · 81 km · 1,871 h sun/yr · best in Nov
- Hachijojima Japan · 189 km · 1,827 h sun/yr · best in Aug
- Matsumoto Japan · 202 km · 1,590 h sun/yr · best in May
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