Planning for the weather is a good way to make your trip to Bellinzona relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are January and February, with an average of 2°C. The rainiest months in Bellinzona are October, November, August and May, with each month seeing an average of 214 mm of rainfall.