Weather is probably a major factor when you plan your trip to Shimo-nojiri, 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 21°C, while the coldest months are January and February, with an average of -1°C. The rainiest months in Shimo-nojiri are July, December, August and January, with each month seeing an average of 240 mm of rainfall.