Tomakomai Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Tomakomai.
Climate overview of Tomakomai
Temperatures in Tomakomai, Hokkaido, Japan, vary greatly throughout the year. August is the hottest month at 23°C (73°F), while January is the coldest at 0°C (32°F).
The city has a wet climate, receiving around 1277 mm (50 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and very cold winters. August is the wettest month. The most sunshine falls in May, with an average of 6.6 hours of daily sunshine.
Tomakomai Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Tomakomai - and find the best time to visit.
Monthly Temperature in Tomakomai
The climate in Tomakomai is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 23°C (73°F) in August to a very cold 0°C (32°F) in January.
Nighttime temperatures range from 19°C (66°F) in August to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Tomakomai
Tomakomai has a notably wet climate with abundant precipitation, recording 1277 mm (50 in) of rain/snowfall per year. The seasons in Tomakomai bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 197 mm (7.8 in) of precipitation. This rainfall is distributed across 19 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 54 mm (2.1 in) over 22 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Tomakomai Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Tomakomai
In Tomakomai, summer days are longer and more sunny, with daily sunshine hours peaking at 6.6 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 2.9 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Tomakomai by Month
The relative humidity is high throughout the year in Tomakomai.
The city experiences its highest humidity in July, reaching 76%. In April, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Tomakomai
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and September
- Warmest weather: August
- Most sunshine: May
- Wettest months: May, June, July, August, September and October, when rainfall is highest.
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Tomakomai
What is the best time to visit Tomakomai?
July and September typically offer the most optimal weather in Tomakomai. In contrast, January, February, March, April, May, November and December tend to have less optimal conditions. Tomakomai has warm summers and very cold winters.
What temperatures can I expect in Tomakomai?
Daytime highs range from 0°C (32°F) in January to 23°C (73°F) in August. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Tomakomai get?
Annual rainfall is around 1277 mm (50 in). August is the wettest month with 197 mm (7.8 in), while January is the driest with 54 mm (2.1 in).
How sunny is Tomakomai?
Tomakomai receives around 1,749 hours of sunshine per year. May is the sunniest month with 199 hours, while December is the cloudiest with just 87 hours.
Tomakomai 3-Day Forecast
Tomakomai on the map
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