If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Castelnuovo Magra: The hottest months are usually August and July with an average temp of 72°F, while the coldest months are January and February with an average of 48°F. The rainiest months in Castelnuovo Magra are November, December, October, and February, with each month seeing an average of 7 inches of rainfall.