Planning for the weather is a good way to make your trip to Toyama relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are January and February, with an average of 3°C. The rainiest months in Toyama are July, September, August and December, with each month seeing an average of 286 mm of rainfall.