September on the Cammino di San Benedetto is generally mild to warm. Afternoons commonly reach 22–31°C in valleys and 17–26°C at higher elevations, with nights around 10–17°C. Skies vary from clear to overcast, and dry stretches are frequent, but showers and occasional heavy rain punctuate the month, with localized daily totals of 10–35 mm and isolated bursts near 67 mm. After rain, brighter spells return quickly.
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As the trail enters Umbria, days around Norcia are variable, with highs 19–31°C and lows 11–22°C under a mix of clear, partly cloudy, and overcast skies. Rain falls intermittently, ranging from light drizzle to moderate falls, with single-day totals up to 22 mm. Moving through Cascia, temperatures hold near 18–31°C by day and 10–19°C at night, with several dry days interspersed with showers around 1–6 mm. Closer to Monteleone di Spoleto, conditions cool slightly to 16–30°C by day and 10–18°C at night, and the wettest spells bring heavier rain near 27 mm amid periods of brighter weather.
Crossing into Lazio at Leonessa, highs run 19–27°C with lows 8–18°C, and skies swing from mainly clear to overcast with light to moderate rain up to 10 mm. Around Poggio Bustone, temperatures stay 21–28°C by day with 12–17°C nights; mostly dry intervals are punctuated by a notable downpour near 45 mm and occasional lighter rain. Approaching Rieti, afternoons warm to 22–31°C with 12–17°C nights, and precipitation is generally light, often 0–3 mm, with plenty of bright periods.
Through Rocca Sinibalda, highs of 22–31°C and lows of 12–17°C accompany a mainly dry pattern, with brief showers around 4 mm. Near Castel di Tora, heat can peak near 33°C with 12–18°C nights, and while many days stay dry, a heavy episode can deliver about 37 mm. Reaching Orvinio, cooler highs of 20–28°C and lows of 9–17°C come with sun–cloud variability and occasional heavier rain around 25 mm.
Continuing toward Mandela, daytime temperatures sit near 22–30°C with 13–18°C nights; weather alternates between overcast spells and sunshine, and rain ranges from light to moderate with a heavy burst around 31 mm. In Subiaco, highs of 18–30°C and lows of 12–17°C prevail; the month mixes dry days with significant rain, including a downpour near 34 mm and several moderate falls of 10–13 mm.
Climbing to Trevi nel Lazio, days run 17–27°C with 10–17°C nights, and showers become more frequent, with a wettest day near 23 mm. Around Collepardo, temperatures vary 15–29°C by day and 9–17°C at night; the wettest surges reach about 35 mm, with other episodes near 7–9 mm and clear breaks between. Farther to Casamari, warmth returns with highs 21–32°C and lows 9–19°C, and most days are dry aside from occasional light to moderate rain up to 8 mm.
Passing Arpino, highs span 19–31°C with intermittent showers and a heavier peak near 19 mm amid many partly cloudy days. Around Roccasecca, temperatures reach 19–33°C with 12–19°C nights, and the most intense rainfall along this stretch can exceed 60 mm in a day, alongside other wet days of 3–25 mm and extended sunny spells. The approach to Montecassino finishes slightly cooler overall, with highs 17–31°C and lows 11–18°C, and scattered rain events up to about 14 mm alternating with clear to overcast skies.
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