If you start the Via Francigena in Lausanne, Switzerland, during September, the weather feels like fall. Expect sunny days with some rain on some days. The temperature is usually between 20°C and 12°C.
The route goes through the places Vevey, Aigle, and Saint-Maurice where the weather stays similar. But the temperature usually drops a bit to an average of around 16°C to 6°C in Martigny as it gets higher.
Next, the path goes through Orsières and col du Grand-Saint-Bernard. Here, there are more cloudy days and the temperature gets lower. Sometimes it snows and it can be as cold as 3°C.
In Italy, the path goes from Aosta to Santhià. The weather here gets gradually sunnier and warmer, with temperatures between 16°C and 25°C. It may rain sometimes, but usually not much.
The journey continues through Lombardy and Emilia Romagna where it stays warm with temperatures from 23°C to 25°C. It can sometimes rain, but it's usually sunny.
In Tuscany, the route goes through Siena on the way to Rome. Here, be ready for occasional big rainstorms even though it's mostly sunny. The temperature drops a little to highs around 20°C and lows around 11°C.
Lastly, the path goes through Campagnano di Roma and then towards Rome. The weather is mostly sunny or sometimes cloudy with temperatures around 22°C. As you get closer to Rome, be ready for some bigger rain showers. The temperatures range from 21°C to 14°C.
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