Parenzana: which way and when to ride

The best month for Parenzana is October: 77% of days were dry with highs of 10–30 °C. In October the wind barely favours either direction — on average 0.2 km/h along the route (ERA5 2006–2025, daytime 9:00–18:00).

How it works ↓

ERA5 2006–2025 · OpenStreetMap · Methodology and sources

118 kmLength

April, September–October (peak October)Best months

eitherBetter direction in the best month

0.2 km/hAverage tailwind in the best month

77%Dry days with 10–30 °C

June · 72%Best summer month

Start: Trieste · Finish: Poreč · Route geometry: OpenStreetMap / Waymarked Trails

Also passes through Slovenia

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	19%	20%	86	8 °C	0%	73%	9.1 †
February	41%	21%	94	9 °C	0%	49%	10.3 †
March	66%	21%	94	12 °C	0%	17%	11.8
April	75%	24%	80	16 °C	0%	2%	13.4
May	69%	31%	112	20 °C	0%	0%	14.9
June	72%	22%	74	25 °C	6%	0%	15.7
July	61%	15%	61	28 °C	25%	0%	15.3
August	60%	16%	87	28 °C	25%	0%	14.1
September	76%	24%	146	23 °C	0%	0%	12.5
October	77%	23%	120	18 °C	0%	0%	10.8 †
November	62%	26%	145	13 °C	0%	14%	9.4 †
December	31%	21%	105	9 °C	0%	56%	8.7 †

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 Trieste → Poreč, km/h

Month	Wind Trieste → Poreč, km/h	Headwind > 15 km/h, Trieste → Poreč	Headwind > 15 km/h, Poreč → Trieste	Better way
January	+1.3	3%	8%	either
February	+1.1	4%	9%	either
March	0.0	5%	9%	either
April	−1.0	3%	5%	either
May	−1.1	3%	3%	either
June	−1.1	2%	2%	either
July	−0.2	1%	3%	either
August	+0.3	1%	3%	either
September	+0.7	3%	6%	either
October	+0.2	4%	7%	either
November	+0.5	5%	8%	either
December	+1.4	3%	7%	either

The Parenzana between Trieste and Poreč is at its best in the shoulder seasons: 77% good days in October, 76% in September, 75% in April (2006–2025). Midsummer loses out to them because of heat, not rain: in July and August every fourth day (25%) reaches 30 °C or above, the July average high is 28 °C, and good days drop to 60–61%. Of the summer months, June is the best at 72%.

Direction: either way

In none of the 12 months does the wind along the route average more than 2 km/h; in October it is 0.2 km/h. Choose between a start in Trieste and in Poreč according to transport. The figures describe the climate of 2006–2025, not a forecast (see the climate block on the page).

A former narrow-gauge railway through three countries

The narrow-gauge railway Trieste–Poreč ran from 1902 to 1935 and was about 123 km long; today a cycle and pedestrian route follows its track through Italy, Slovenia and Croatia. Measured on OpenStreetMap traces, the site counts 118 km. Neighbouring routes: Croatia, Slovenia, Italy.

Along the route (sections of about 25 km)

km	Heading	Tailwind in October, km/h
0–2	E	−3.5
2–27	SW	+3.0
27–52	S	−1.1
52–77	SE	−3.3
77–103	SW	+1.6
103–117	SW	+1.5

OpenStreetMap · Waymarked Trails