Climate Insights for Tomari

The climate in Tomari is cool. The average annual temperature is 3°C and approximately 815mm of precipitation falls per year. Tomari receives a notable amount of rainfall throughout the year, including during its driest month. Tomari is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, December, when temperatures can drop to -14°C. Tomari experiences heavy snowfall, typically from January through December.

Temperatures in Tomari vary considerably across the year, with a 34°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 20°C with a mean of 17°C. The coldest month is February, when overnight lows fall to -14°C and the daily average is -11°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between October and November, with a 9°C shift in average temperatures.

Tomari is a moderately rainy area, receiving approximately 815mm of precipitation annually, which averages out to around 68mm per month. The wettest month is October, averaging 93mm of rainfall. August and June also tend to see above-average precipitation. The driest month is February, with just 37mm. That's 56mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Tomari receives heavy snowfall, accumulating around 305cm annually from January through December. The snowiest month is December, with approximately 74cm. Winter travel should account for significant snow cover.

Tomari is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Tomari, which began on June 21, 2026. Tomari is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 20°C, while the coldest stretch bottoms out in February near -14°C. Autumn is next, beginning on September 23, 2026 — 80 days from now.

The best time to visit Tomari is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 77mm per month. By contrast, February can be quite cold with temperatures dropping to -14°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Tomari based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.