Weather in Rishiri

Prepare for your trip to Rishiri by checking the current weather information. Below, you will find up-to-date forecasts and visual climate charts for your convenience.

The climate of Rishiri can be described as cool and temperate, significantly influenced by its northern latitude. Extreme heat is non-existent here, making the island a true haven for those who prefer cooler weather. The conditions are perfect for the peaceful contemplation of nature, offering tourists comfortable coolness even at the height of the calendar summer.

The seasons on the island are quite distinct. Winters are frosty, with an average temperature of around -3°C, creating a harsh yet picturesque atmosphere. Summer, by contrast, is very mild: in August, the warmest month, the air warms up to an average of just 20°C, making this the best time for hiking and outdoor activities without the risk of overheating.

A characteristic feature of the local weather is the high frequency of precipitation during the colder months: in winter, snow can fall almost daily (up to 26 days a month), although the volume is often small. In summer, the number of cloudy and rainy days decreases significantly, allowing travellers to enjoy more stable weather.

The climate in Rishiri is distinctively cool, typical of Japan's northern latitudes, where exhausting heat is absent even in summer. The coldest period falls in January and February, when the average temperature drops to -3.7°C. Winters are frosty: the thermometer consistently stays below freezing, reaching minimums of around -5.1°C. Even during the day, the air rarely warms above -2°C in these months, so high-quality warm clothing is essential for a winter trip.

The summer season on Rishiri is mild and refreshing, making it attractive for those who struggle with the heat. The warmest month is August, with an average temperature of 20.2°C. Maximum highs during this time rarely exceed 21.3°C, creating ideal conditions for hiking and nature walks. July and September also offer comfortable weather, maintaining an average temperature of around 18°C, although it can still be cool even in summer, especially when it is windy.

A feature of Rishiri's temperature pattern is the minimal daily range. Thanks to the maritime influence, the difference between daytime highs and nighttime lows is usually only 1–2 degrees. This ensures stable weather conditions throughout the day without sharp fluctuations. The transitional seasons are prolonged: spring arrives slowly, with temperatures around +1°C in March, while autumn brings a gradual cooling from +12°C in October to +5°C in November.

Precipitation on the island of Rishiri is distributed unevenly throughout the year, creating distinct seasonality. The winter months, especially December and January, are characterized by a high frequency of precipitation: snow falls almost daily, as the number of "wet" days reaches 26 per month. Given the sub-zero average temperatures (down to -3.7°C), the island is blanketed in a dense layer of snow, creating picturesque winter landscapes, although the total volume of precipitation remains moderate.

Summer brings drier and more comfortable weather. July can be considered the most favourable month for travel, as the number of rainy days drops to a minimum — about 8 days per month. This is the best time for hiking and exploring nature, as the likelihood of prolonged rain is extremely low. However, by August, the frequency of precipitation increases slightly, reaching 13 days.

The transitional seasons demonstrate a shift in weather patterns. Spring, especially April, is a relatively dry period (with only 9 days of precipitation), making it pleasant to visit. In autumn, starting from October, the weather deteriorates: the number of inclement days rises sharply to 17, and by November reaches 22. During this time, rain gradually turns to snow, and precipitation volumes reach their annual peaks (around 6 mm).

The weather on Rishiri Island is characterized by a cool northern climate, so the principle of layering clothing is relevant all year round. In winter, when temperatures drop below freezing and it snows frequently, you will definitely need quality thermal underwear, a windproof down jacket, a hat, a scarf, and gloves. Given the high humidity and frequent precipitation in the cold months (up to 26 wet days in January), warm waterproof shoes with non-slip soles will be your best ally.

Summer on the island is mild and fresh, with no exhausting heat: even in August, the average temperature stays around +20°C. For a trip during this season, light trousers and T-shirts are suitable, but be sure to pack a fleece jacket and a windbreaker for cool evenings or windy days by the coast. Since Rishiri is famous for its nature trails and hiking opportunities, comfortable and broken-in trekking boots are a must-have item on your packing list.

Regardless of the time of year, be prepared for the changeability of the island weather. Rain is possible even in summer, so a compact raincoat or a sturdy umbrella should always be at hand. Also, do not forget sunscreen and sunglasses: even in cool weather, especially when climbing the mountain, the sun can be quite strong.