Rishiri weather by month & the best time to visit
Japan · seaside town · oceanic / maritime climate
The best time to visit Rishiri is September — its sunniest month (Sunshine Score 65/100), with July and August close behind. Rishiri averages about 1,513 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 123 mm of rain in September.
When is the best time to visit Rishiri?
For sunshine, the best time to visit Rishiri is September, then July and August. The dullest month is January (0/100, 97 mm of rain). The full month-by-month picture is in the table below.
How sunny is Rishiri?
Rishiri isn't a sunny place by world standards: about 1,513 hours of sunshine a year. 65 Sunshine Score points separate September (65) from January (0), so the month you pick matters. It ranks #70 of 79 destinations in Japan for annual sunshine, below the national median of 1,773 hours. The year's 1,179 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | -1° / 30°F | -4° / 25°F | 97 mm | 0 | 6° / 43°F |
| February | 0 | -1° / 30°F | -4° / 25°F | 80 mm | 1 | 3° / 37°F |
| March | 0 | 2° / 36°F | -1° / 30°F | 71 mm | 2 | 4° / 39°F |
| April | 0 | 6° / 43°F | 3° / 37°F | 58 mm | 3 | 6° / 43°F |
| May | 12 | 10° / 50°F | 7° / 45°F | 73 mm | 4 | 8° / 46°F |
| June | 43 | 15° / 59°F | 12° / 54°F | 78 mm | 5 | 13° / 55°F |
| July | 63 | 19° / 66°F | 16° / 61°F | 102 mm | 5 | 19° / 66°F |
| August | 63 | 21° / 70°F | 19° / 66°F | 131 mm | 5 | 22° / 72°F |
| September | 65 | 20° / 68°F | 17° / 63°F | 123 mm | 4 | 21° / 70°F |
| October | 33 | 14° / 57°F | 11° / 52°F | 117 mm | 2 | 17° / 63°F |
| November | 0 | 7° / 45°F | 4° / 39°F | 123 mm | 1 | 11° / 52°F |
| December | 0 | 1° / 34°F | -2° / 28°F | 126 mm | 0 | 7° / 45°F |
Sea temperature in Rishiri by month
The sea off Rishiri is warmest in August at around 22°C / 72°F, and coolest in February at 3°C / 37°F. The water sits at a comfortable 21°C or warmer roughly 2 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Rishiri: questions and answers
What kind of destination is Rishiri?
Rishiri is a seaside town in Japan with a oceanic / maritime climate — the sea reaches 22°C at its warmest and is swimmable (21°C+) about 2 months a year.
How many hours of sunshine does Rishiri get a year?
Rishiri gets about 1,513 hours of sunshine a year, at its best around September.
When is the best time to visit Rishiri?
The sunniest time to visit Rishiri is September, when the Sunshine Score peaks at 65/100 (with July and August close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in Rishiri?
January is the least sunny month in Rishiri, scoring 0/100 with about 97 mm of rain.
What is the sea temperature in Rishiri?
The sea in Rishiri ranges from about 3°C (February) to 22°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Rishiri?
The typical midday UV index in Rishiri peaks around 5 (moderate) in June, easing to about 0 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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