Other facts from our historical weather data: Which is the warmest month in Ust-Kamtsjatsk? August has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Ust-Kamtsjatsk? The coldest month is January with an average maximum temperature of -5°C (23°F). Which is the wettest month in Ust-Kamtsjatsk? October tops the wettest month list with 107mm (4.2 in) of rainfall. Which is the driest month in Ust-Kamtsjatsk? June is the driest month with 55mm (2.2 in) of precipitation. Which is the sunniest month in Ust-Kamtsjatsk? April is the sunniest month with an average of 186 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.