Hiroshima vs Okayama: which is sunnier?
🇯🇵 Japan vs 🇯🇵 Japan · 93 km apart · long-term climate normals (NASA POWER, 2001–2020)
Okayama is the sunnier overall: about 1,914 hours of sunshine a year to Hiroshima's 1,773. Okayama has the higher Sunshine Score in 2 of 12 months, Hiroshima in 1 (9 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Hiroshima | Okayama | |
|---|---|---|
| Sunshine hours / year | 1,773 | 1,914 |
| Sunniest month | October (67/100) | August (68/100) |
| Nov–Feb average score | 11/100 | 9/100 |
| Jun–Aug average score | 63/100 | 64/100 |
| Rain / year | 1,527 mm | 1,487 mm |
| Peak midday UV | 7 (high) | 8 (very high) |
Hiroshima vs Okayama month by month
| Month | Sunshine Score | Day high °C | Rain mm | |||
|---|---|---|---|---|---|---|
| Hiroshima | Okayama | Hiroshima | Okayama | Hiroshima | Okayama | |
| January | 0 | 0 | 6° | 5° | 60 | 86 |
| February | 0 | 0 | 8° | 7° | 73 | 81 |
| March | 17 | 18 | 11° | 11° | 104 | 103 |
| April | 50 | 53 | 17° | 17° | 118 | 105 |
| May | 63 | 67 | 22° | 23° | 142 | 122 |
| June | 61 | 62 | 25° | 26° | 208 | 172 |
| July | 61 | 62 | 28° | 29° | 240 | 212 |
| August | 66 | 68 | 29° | 30° | 127 | 120 |
| September | 61 | 62 | 26° | 26° | 179 | 179 |
| October | 67 | 67 | 20° | 20° | 121 | 122 |
| November | 44 | 37 | 15° | 14° | 76 | 83 |
| December | 0 | 0 | 8° | 8° | 79 | 102 |
The sunnier month by month: Jan even · Feb even · Mar even · Apr Okayama · May Okayama · Jun even · Jul even · Aug even · Sep even · Oct even · Nov Hiroshima · Dec even.
When to pick which
- November–February: too close to call — Hiroshima averages 11/100, Okayama 9/100. Daytime highs are similar (9°C vs 9°C). See the winter sun ranking.
- March–May: Okayama (average score 46/100 vs 43). Daytime highs are similar (17°C vs 17°C).
- June–August: too close to call — Hiroshima averages 63/100, Okayama 64/100. Daytime highs are similar (27°C vs 28°C).
- September–October: too close to call — Hiroshima averages 64/100, Okayama 65/100. Daytime highs are similar (23°C vs 23°C).
Full month-by-month guides: Hiroshima weather by month · Okayama weather by month · Best time to visit Japan.
More comparisons: Hiroshima vs Matsuyama · Hiroshima vs Izumo · Hiroshima vs Iwakuni · Okayama vs Tottori · Okayama vs Takamatsu · Okayama vs Izumo · all head-to-heads