Weather is probably a major factor when you plan your trip to Hamatonbetsu, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 16°C, while the coldest months are February and January, with an average of -4°C. The snowiest months in Hamatonbetsu are March, January, February and December, with each month seeing an average of 249 cm of snowfall.