Matsuyama vs Iwakuni: which is sunnier?
🇯🇵 Japan vs 🇯🇵 Japan · 55 km apart · long-term climate normals (NASA POWER, 2001–2020)
Matsuyama is the sunnier overall: about 1,883 hours of sunshine a year to Iwakuni's 1,773. Their Sunshine Scores are within 2 points of each other in every month of the year.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Matsuyama | Iwakuni | |
|---|---|---|
| Sunshine hours / year | 1,883 | 1,773 |
| Sunniest month | October (68/100) | October (67/100) |
| Nov–Feb average score | 27/100 | 27/100 |
| Jun–Aug average score | 63/100 | 62/100 |
| Rain / year | 1,621 mm | 1,621 mm |
| Warmest sea | 30°C / 86°F | 30°C / 86°F |
| Peak midday UV | 8 (very high) | 7 (high) |
Matsuyama vs Iwakuni month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| Matsuyama | Iwakuni | Matsuyama | Iwakuni | Matsuyama | Iwakuni | Matsuyama | Iwakuni | |
| January | 7 | 7 | 9° | 9° | 56 | 56 | 14° | 14° |
| February | 19 | 19 | 11° | 11° | 76 | 76 | 12° | 12° |
| March | 35 | 34 | 14° | 14° | 109 | 109 | 13° | 12° |
| April | 55 | 55 | 18° | 18° | 128 | 128 | 16° | 16° |
| May | 62 | 61 | 22° | 22° | 153 | 153 | 18° | 18° |
| June | 62 | 61 | 25° | 25° | 242 | 242 | 22° | 22° |
| July | 62 | 61 | 28° | 28° | 268 | 268 | 27° | 26° |
| August | 64 | 64 | 30° | 30° | 138 | 138 | 30° | 30° |
| September | 62 | 61 | 27° | 27° | 181 | 181 | 29° | 28° |
| October | 68 | 67 | 23° | 23° | 119 | 119 | 24° | 24° |
| November | 57 | 56 | 17° | 17° | 77 | 77 | 21° | 21° |
| December | 25 | 25 | 12° | 12° | 74 | 74 | 16° | 16° |
The sunnier month by month: Jan even · Feb even · Mar even · Apr even · May even · Jun even · Jul even · Aug even · Sep even · Oct even · Nov even · Dec even.
When to pick which
- November–February: too close to call — Matsuyama averages 27/100, Iwakuni 27/100. Daytime highs are similar (12°C vs 12°C). See the winter sun ranking.
- March–May: too close to call — Matsuyama averages 51/100, Iwakuni 50/100. Daytime highs are similar (18°C vs 18°C).
- June–August: too close to call — Matsuyama averages 63/100, Iwakuni 62/100. Daytime highs are similar (28°C vs 28°C).
- September–October: too close to call — Matsuyama averages 65/100, 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+): Matsuyama 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: Matsuyama weather by month · Iwakuni weather by month · Best time to visit Japan.
More comparisons: Matsuyama vs Hiroshima · Matsuyama vs Kochi · Iwakuni vs Hiroshima · Iwakuni vs Oita · all head-to-heads