Hiroshima vs Izumo: which is sunnier?
🇯🇵 Japan vs 🇯🇵 Japan · 109 km apart · long-term climate normals (NASA POWER, 2001–2020)
Hiroshima is the sunnier overall: about 1,773 hours of sunshine a year to Izumo's 1,647. Izumo has the higher Sunshine Score in 3 of 12 months, Hiroshima in 2 (7 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Hiroshima | Izumo | |
|---|---|---|
| Sunshine hours / year | 1,773 | 1,647 |
| Sunniest month | October (67/100) | May (65/100) |
| Nov–Feb average score | 11/100 | 15/100 |
| Jun–Aug average score | 63/100 | 62/100 |
| Rain / year | 1,527 mm | 1,738 mm |
| Warmest sea | 30°C / 86°F | 28°C / 82°F |
| Peak midday UV | 7 (high) | 7 (high) |
Hiroshima vs Izumo month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| Hiroshima | Izumo | Hiroshima | Izumo | Hiroshima | Izumo | Hiroshima | Izumo | |
| January | 0 | 0 | 6° | 8° | 60 | 132 | 14° | 15° |
| February | 0 | 6 | 8° | 9° | 73 | 108 | 12° | 14° |
| March | 17 | 22 | 11° | 12° | 104 | 124 | 12° | 13° |
| April | 50 | 45 | 17° | 16° | 118 | 116 | 16° | 16° |
| May | 63 | 65 | 22° | 21° | 142 | 124 | 18° | 19° |
| June | 61 | 61 | 25° | 25° | 208 | 182 | 22° | 22° |
| July | 61 | 61 | 28° | 28° | 240 | 221 | 26° | 26° |
| August | 66 | 65 | 29° | 30° | 127 | 125 | 30° | 28° |
| September | 61 | 61 | 26° | 26° | 179 | 204 | 29° | 28° |
| October | 67 | 63 | 20° | 21° | 121 | 138 | 25° | 23° |
| November | 44 | 45 | 15° | 16° | 76 | 111 | 21° | 21° |
| December | 0 | 10 | 8° | 10° | 79 | 153 | 16° | 17° |
The sunnier month by month: Jan even · Feb Izumo · Mar Izumo · Apr Hiroshima · May even · Jun even · Jul even · Aug even · Sep even · Oct Hiroshima · Nov even · Dec Izumo.
When to pick which
- November–February: Izumo (average score 15/100 vs 11). Izumo is the warmer, around 11°C daytime highs vs 9°C. See the winter sun ranking.
- March–May: too close to call — Hiroshima averages 43/100, Izumo 44/100. Daytime highs are similar (17°C vs 16°C).
- June–August: too close to call — Hiroshima averages 63/100, Izumo 62/100. Daytime highs are similar (27°C vs 28°C).
- September–October: too close to call — Hiroshima averages 64/100, Izumo 62/100. Daytime highs are similar (23°C vs 24°C).
Sea temperature
Hiroshima's sea gets warmer: 30°C / 86°F at its peak vs 28°C. Swimmable water (21°C+): Hiroshima about 6 months a year, Izumo about 6 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: Hiroshima weather by month · Izumo weather by month · Best time to visit Japan.
More comparisons: Hiroshima vs Okayama · Hiroshima vs Matsuyama · Hiroshima vs Iwakuni · Izumo vs Okayama · Izumo vs Tottori · Izumo vs Yonago · all head-to-heads