Iwakuni weather by month & the best time to visit
🇯🇵 Japan · beach resort · humid subtropical climate
The best time to visit Iwakuni is October — its sunniest month (Sunshine Score 67/100), with August and May close behind. Iwakuni averages about 1,773 hours of sunshine a year. Daytime highs around 23°C / 73°F and roughly 119 mm of rain in October.
Jump to: month-by-month table · sea temperature · nearby alternatives · embed this data
- Sun hours / year
- 1,773
- Sunniest month
- October
- Peak score
- 67/100
- Rain / year
- 1,621 mm
- Midday UV at peak
- 7 (high)
- Sea at warmest
- 30°C / 86°F
- Population
- 129k
- Elevation
- Sea level
When is the best time to visit Iwakuni?
For sunshine, the best time to visit Iwakuni is October, then August and May. The dullest month is January (7/100, 56 mm of rain). The full month-by-month picture is in the table below.
How sunny is Iwakuni?
Iwakuni isn't a sunny place by world standards: about 1,773 hours of sunshine a year. 60 Sunshine Score points separate October (67) from January (7), so the month you pick matters. It ranks #41 of 79 destinations in Japan for annual sunshine, right at the national median of 1,773 hours. Rain has a clear season: the wettest stretch, around June, carries about 41% of the annual 1,621 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 7 | 9° / 48°F | 4° / 39°F | 56 mm | 2 | 14° / 57°F |
| February | 19 | 11° / 52°F | 5° / 41°F | 76 mm | 3 | 12° / 54°F |
| March | 34 | 14° / 57°F | 7° / 45°F | 109 mm | 4 | 12° / 54°F |
| April | 55 | 18° / 64°F | 11° / 52°F | 128 mm | 5 | 16° / 61°F |
| May | 61 | 22° / 72°F | 15° / 59°F | 153 mm | 6 | 18° / 64°F |
| June | 61 | 25° / 77°F | 20° / 68°F | 242 mm | 6 | 22° / 72°F |
| July | 61 | 28° / 82°F | 24° / 75°F | 268 mm | 7 | 26° / 79°F |
| August | 64 | 30° / 86°F | 25° / 77°F | 138 mm | 7 | 30° / 86°F |
| September | 61 | 27° / 81°F | 22° / 72°F | 181 mm | 6 | 28° / 82°F |
| October | 67 | 23° / 73°F | 17° / 63°F | 119 mm | 4 | 24° / 75°F |
| November | 56 | 17° / 63°F | 12° / 54°F | 77 mm | 3 | 21° / 70°F |
| December | 25 | 12° / 54°F | 7° / 45°F | 74 mm | 2 | 16° / 61°F |
Sea temperature in Iwakuni by month
The sea off Iwakuni is warmest in August at around 30°C / 86°F, and coolest in February at 12°C / 54°F. The water sits at a comfortable 21°C or warmer roughly 6 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Iwakuni on the interactive sunshine globe →
Nearby places for sunshine
- Matsuyama Japan · 55 km · best in Oct · 1,883 h sun/yr
- Hiroshima Japan · 70 km · best in Oct · 1,773 h sun/yr
- Oita Japan · 88 km · best in Oct · 1,801 h sun/yr
- Ube Japan · 92 km · best in Oct · 1,801 h sun/yr
- Kitakyushu Japan · 117 km · best in Oct · 1,801 h sun/yr
- Kochi (Japan) Japan · 147 km · best in May · 1,922 h sun/yr
Nearest destinations
- Masuda Japan · 72 km · 1,655 h sun/yr · best in Oct
Head-to-head
How Iwakuni compares month by month: Iwakuni vs Hiroshima · Iwakuni vs Matsuyama · Iwakuni vs Oita · all comparisons
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