Ciclovia Francigena Italia, stage 4: Lucca → Siena

On stage 4 (Lucca → Siena, 136 km) the best month is October: 78% of days were dry with highs of 10–30 °C; the wind barely favours either direction (1.0 km/h on average; ERA5 2006–2025, 9:00–18:00).

ERA5 2006–2025 · OpenStreetMap · Methodology and sources

← Ciclovia Francigena Italia (Whole route)

136 kmLength

OctoberBest months

eitherBetter direction in the best month

1.0 km/hAverage tailwind in the best month

78%Dry days with 10–30 °C

June · 61%Best summer month

Start: Lucca · Finish: Siena · Route geometry: OpenStreetMap / Waymarked Trails

Weather by month

Good days

Month	Good days	Rain days ≥ 1 mm	Rain, mm	Avg high	Days ≥ 30 °C	Days < 10 °C	Daylight, h
January	39%	23%	79	10 °C	0%	51%	9.3 †
February	55%	26%	91	11 °C	0%	28%	10.4 †
March	69%	26%	86	14 °C	0%	10%	11.8
April	73%	27%	74	18 °C	0%	0%	13.4
May	69%	30%	86	22 °C	1%	0%	14.7
June	61%	22%	49	27 °C	18%	0%	15.4
July	41%	12%	33	30 °C	50%	0%	15.1
August	39%	16%	45	30 °C	49%	0%	14.0
September	70%	23%	97	25 °C	8%	0%	12.4
October	78%	22%	115	20 °C	0%	0%	10.9 †
November	67%	27%	129	14 °C	0%	8%	9.6 †
December	47%	23%	96	11 °C	0%	37%	8.9 †

Best months are all months within 3 percentage points of the best one. † less than 11 hours of daylight — long stages get tight.

Wind by month

Wind Lucca → Siena, km/h

Month	Wind Lucca → Siena, km/h	Headwind > 15 km/h, Lucca → Siena	Headwind > 15 km/h, Siena → Lucca	Better way
January	−1.4	1%	1%	either
February	−0.5	1%	1%	either
March	0.0	1%	1%	either
April	+0.6	1%	0%	either
May	+1.6	0%	1%	either
June	+2.2	0%	0%	Lucca → Siena
July	+2.9	0%	0%	Lucca → Siena
August	+2.2	0%	0%	Lucca → Siena
September	+0.6	0%	0%	either
October	−1.0	1%	0%	either
November	−1.7	1%	1%	either
December	−1.6	1%	0%	either

Along the route (sections of about 25 km)

km	Heading	Tailwind in October, km/h
424–449	SE	−1.6
449–474	SE	−0.8
474–499	S	0.0
499–525	SE	−1.4
525–550	SE	−0.9
550–560	SE	−1.6

Other stages

How to read the numbers

Wind is the 10 m wind of a 25-km grid cell, daytime hours 9:00–18:00 local solar time; at saddle height in a sheltered valley it is weaker, on a coast or ridge stronger. A positive value is a tailwind. ERA5 slightly over-counts days with ≥ 1 mm of rain (by about 5–7 percentage points) and underestimates daily highs by 1–2 °C. Good day = less than 1 mm of rain between 9:00 and 18:00 (riding hours, local solar time) and a high between 10 and 30 °C; rain at night or in the evening does not spoil it.