Oita vs Iwakuni: which is sunnier?
🇯🇵 Japan vs 🇯🇵 Japan · 88 km apart · long-term climate normals (NASA POWER, 2001–2020)
Oita and Iwakuni are virtually tied for annual sunshine — about 1,801 vs 1,773 hours a year. Oita has the higher Sunshine Score in 3 of 12 months; the other 9 are within 2 points.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Oita | Iwakuni | |
|---|---|---|
| Sunshine hours / year | 1,801 | 1,773 |
| Sunniest month | October (65/100) | October (67/100) |
| Nov–Feb average score | 32/100 | 27/100 |
| Jun–Aug average score | 62/100 | 62/100 |
| Rain / year | 1,780 mm | 1,621 mm |
| Warmest sea | 30°C / 86°F | 30°C / 86°F |
| Peak midday UV | 8 (very high) | 7 (high) |
Oita vs Iwakuni month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| Oita | Iwakuni | Oita | Iwakuni | Oita | Iwakuni | Oita | Iwakuni | |
| January | 13 | 7 | 10° | 9° | 60 | 56 | 14° | 14° |
| February | 19 | 19 | 11° | 11° | 82 | 76 | 13° | 12° |
| March | 35 | 34 | 14° | 14° | 109 | 109 | 13° | 12° |
| April | 54 | 55 | 18° | 18° | 130 | 128 | 15° | 16° |
| May | 62 | 61 | 21° | 22° | 157 | 153 | 18° | 18° |
| June | 62 | 61 | 24° | 25° | 292 | 242 | 22° | 22° |
| July | 62 | 61 | 28° | 28° | 293 | 268 | 27° | 26° |
| August | 62 | 64 | 29° | 30° | 169 | 138 | 30° | 30° |
| September | 62 | 61 | 27° | 27° | 208 | 181 | 28° | 28° |
| October | 65 | 67 | 22° | 23° | 129 | 119 | 24° | 24° |
| November | 62 | 56 | 18° | 17° | 80 | 77 | 22° | 21° |
| December | 32 | 25 | 13° | 12° | 71 | 74 | 18° | 16° |
The sunnier month by month: Jan Oita · Feb even · Mar even · Apr even · May even · Jun even · Jul even · Aug even · Sep even · Oct even · Nov Oita · Dec Oita.
When to pick which
- November–February: Oita (average score 32/100 vs 27). Daytime highs are similar (13°C vs 12°C). See the winter sun ranking.
- March–May: too close to call — Oita averages 50/100, Iwakuni 50/100. Daytime highs are similar (18°C vs 18°C).
- June–August: too close to call — Oita averages 62/100, Iwakuni 62/100. Daytime highs are similar (27°C vs 28°C).
- September–October: too close to call — Oita averages 64/100, Iwakuni 64/100. Daytime highs are similar (25°C vs 25°C).
Sea temperature
Both seas peak at 30°C / 86°F. Swimmable water (21°C+): Oita about 6 months a year, Iwakuni about 6 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: Oita weather by month · Iwakuni weather by month · Best time to visit Japan.
More comparisons: Oita vs Kitakyushu · Oita vs Ube · Iwakuni vs Hiroshima · Iwakuni vs Matsuyama · all head-to-heads