In August, the Via Francigena route from Lausanne to Rome experiences varied weather patterns. The beginning of the trail in Switzerland encounters a mix of sunny and rainy days, with occasional heavy showers. As the route descends into Italy, temperatures generally rise while precipitation varies, featuring periods of dry weather interspersed with showers. The Aosta Valley and Piedmont regions tend to have a mix of sunny spells and rain showers, while Lombardy experiences a warm climate with more frequent sunny days. Emilia-Romagna sees warm, sunny periods with some rain. Tuscany experiences intermittent rain with sunny days, and Lazio sees patchy rain with warm temperatures towards the end of the journey, indicative of the Mediterranean summer.
August weather in the Canton of Vaud varies from bright sunny days to periods of moderate to heavy rain. In Lausanne, expect temperatures to range from 19°C to 29°C, with some days experiencing heavy rain and thunder, and precipitation reaching up to 15.6 mm. As the route progresses to Vevey, the weather continues with a combination of heavy rain showers and sunny intervals; the temperatures peak at 30°C, while rainfall reaches a maximum of 13 mm. In Aigle, the hike experiences moderate rain up to 26.9 mm on certain days, with temperatures ranging from 14°C to 31°C amidst sunny breaks.
Saint-Maurice welcomes hikers with a mix of heavy showers and partly cloudy weather. Rainfall varies between negligible to substantial with periods of up to 23.1 mm. Martigny faces similar conditions, with temperatures between 6°C and 26°C, and rainfall peaks at 42.4 mm. In Orsières and Bourg-Saint-Pierre, there are frequent rain showers, including heavy rain of up to 21.3 mm, while temperatures fluctuate from 0°C to 23°C. Towards Col du Grand-Saint-Bernard, weather conditions become harsh with rain and snow patches, and precipitation can soar to 54.3 mm on rainy days.
The Aosta Valley greets travelers with a mixed bag of weather. Étroubles has days of heavy showers, topping at 22.9 mm, alongside sunnier weather with temperatures reaching 24°C. Aosta follows with occasionally rainy periods with 22.1 mm falling on wet days, and highs touching 29°C. In Châtillon, the trend continues with moderate and heavy showers, peaking at 16.2 mm, and temperatures from 4°C to 23°C. The region tends to combine stretches of sun interspersed with cloudy, rainy spells.
In Piedmont, Ivrea witnesses fluctuating weather patterns, including patchy rain and heavy showers, with rain levels reaching 79.7 mm, while temperatures can reach up to 31°C. Moving further to Viverone and Santhià, the weather shows sunny spells, albeit with intermittent moderate rain showers, with temperatures maxing at 32°C.
Lombardy experiences warm weather with frequent sunny days. In Tromello and Pavia, temperatures can rise significantly to 35°C, interrupted by occasional heavy rainfall. Belgioioso and Orio Litta follow a similar pattern, with sunny periods prevailing, yet there are intervals of moderate rain showers.
As hikers pass through Piacenza, Fiorenzuola d'Arda, and Fidenza in Emilia-Romagna, the weather mostly remains warm and sunny. Temperatures frequently surpass 30°C, although there are instances of moderate to heavy showers with rainfall reaching up to 29.4 mm.
In Tuscany, the route is met with a blend of weather conditions. Starting in Pontremoli and Aulla, sunny days frequently interrupt the rain spells, with some heavy showers peaking at 33.2 mm in Pontremoli. In Lucca, sunny days dominate, but rain showers are possible, particularly in late stages of the month. Siena and surrounding towns in Tuscany experience a mix of sunny weather and rains, contributing to an overall warm climate, with temperatures reaching up to 34°C during sunny spans.
Finally, in Lazio, as pilgrims make their way to Rome, weather conditions improve with more frequent sunny spells, although rain showers still occur with precipitation up to 28.4 mm in Campagnano di Roma. Temperatures vary from 14°C to 32°C, providing both cooler mornings and warmer afternoons. Hikers will occasionally encounter heavy rain showers but can expect the weather to predominantly remain warm with intermittent cloud cover.
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