Other facts from our historical weather data: Which is the warmest month in Red Castle? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Red Castle? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Red Castle? November tops the wettest month list with 129mm (5.1 in) of rainfall. Which is the driest month in Red Castle? May is the driest month with 85mm (3.3 in) of precipitation. Which is the sunniest month in Red Castle? May is the sunniest month with an average of 203 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.