Planning for the weather is a good way to make your trip to Legnano relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 22°C, while the coldest months are January and December, with an average of 5°C. The rainiest months in Legnano are November, October, May and August, with each month seeing an average of 194 mm of rainfall.