Italy · 1991–2020

Best time to visit
Castelvetrano.

May leads for comfortable weather in Castelvetrano: typically 23.5°C by day, 13.6°C at night, with 18 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.5°C

Typical low13.6°C

Rain in May18 mm

Comfort

May

May · June · October

96climate match

Beach

July

July · August · September

94climate match

Outdoors

April

April · November · May

97climate match

The weakest month is January, scoring 48 against May’s 96 — days reach only 15°C, 9° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

4815° / 7.3°

Feb

4814.9° / 7°

Mar

6117.2° / 8.7°

Apr

7619.9° / 10.4°

May

9623.5° / 13.6°

Jun

8427.5° / 17.2°

Jul

6930.5° / 20.4°

Aug

6631° / 20.9°

Sep

7528.2° / 19.2°

Oct

8324.5° / 15.9°

Nov

7320.1° / 12.3°

Dec

5316.3° / 9.4°

Monthly climate evidence for Castelvetrano — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 16 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	15°C	7.3°C	63 mm	7.9	15.0°C	9 h 49	48	Good coverage
February	14.9°C	7°C	54 mm	8	14.5°C	10 h 44	48	Good coverage
March	17.2°C	8.7°C	51 mm	6.7	14.6°C	11 h 50	61	Good coverage
April	19.9°C	10.4°C	33 mm	4.8	15.4°C	13 h 07	76	Good coverage
May	23.5°C	13.6°C	18 mm	2.9	17.5°C	14 h 11	96	Good coverage
June	27.5°C	17.2°C	5 mm	0.9	20.8°C	14 h 45	84	Good coverage
July	30.5°C	20.4°C	2 mm	0.5	23.7°C	14 h 32	69	Good coverage
August	31°C	20.9°C	5 mm	0.9	25.1°C	13 h 37	66	Good coverage
September	28.2°C	19.2°C	46 mm	4.6	23.9°C	12 h 23	75	Good coverage
October	24.5°C	15.9°C	111 mm	6.3	21.7°C	11 h 09	83	Good coverage
November	20.1°C	12.3°C	71 mm	8.1	19.1°C	10 h 05	73	Good coverage
December	16.3°C	9.4°C	73 mm	9.9	16.3°C	9 h 34	53	Good coverage

What has changed

Castelvetrano runs +1.1°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.6

Feb

+0.6

Mar

+1.0

Apr

+1.3

May

+0.4

Jun

+1.9

Jul

+1.6

Aug

+1.3

Sep

+1.3

Oct

+1.0

Nov

+1.3

Dec

+0.8

May daytime highs, 2011–2025. Last recorded: 23.8°C.

Records at TRAPANI BIRGI, 1966–2025
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.6°C14 Jan 1982	-1.5°C13 Jan 1999	96 mm25 Jan 1992	148 mm2017 · driest 0 mm in 2020	56
February	23.9°C27 Feb 1966	-1.6°C10 Feb 1999	41 mm6 Feb 2018	150 mm2015 · driest 0 mm in 2020	57
March	29.0°C30 Mar 1981	-0.8°C12 Mar 1999	144 mm3 Mar 2010	174 mm2010 · driest 0 mm in 2017	56
April	33.4°C18 Apr 2016	-1.6°C19 Apr 1992	155 mm28 Apr 1976	172 mm1976 · driest 0 mm in 1983	55
May	39.4°C23 May 2006	6.0°C8 May 2019	182 mm29 May 1978	257 mm1980 · driest 0 mm in 2017	53
June	43.0°C26 Jun 1982	7.0°C22 Jun 1995	21 mm14 Jun 2018	26 mm2018 · driest 0 mm in 1985	56
July	42.2°C25 Jul 2025	11.0°C1 Jul 1977	17 mm23 Jul 2012	17 mm2012 · driest 0 mm in 2018	54
August	40.2°C10 Aug 2021	9.0°C3 Aug 1973	23 mm27 Aug 1975	55 mm1975 · driest 0 mm in 1991	53
September	40.0°C1 Sep 1988	10.0°C29 Sep 1977	290 mm16 Sep 1982	290 mm1982 · driest 0 mm in 1987	53
October	36.0°C20 Oct 1978	-1.1°C27 Oct 1997	259 mm24 Oct 1993	553 mm1993 · driest 1 mm in 1985	56
November	27.2°C7 Nov 2023	-0.9°C25 Nov 1997	127 mm18 Nov 1976	267 mm1976 · driest 1 mm in 1970	54
December	28.8°C8 Dec 1985	-1.1°C15 Dec 1997	82 mm9 Dec 2004	197 mm2004 · driest 0 mm in 1976	54

Typical days per month at TRAPANI BIRGI, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	0	0	2
February	0	0	2
March	<1	0	1
April	2	<1	<1
May	9	2	<1
June	21	6	<1
July	28	15	<1
August	29	18	<1
September	26	6	1
October	13	<1	2
November	<1	0	2
December	0	0	2

The best month has moved. On the 1961–1990 numbers the strongest month here was October (scoring 97); on 2011–2025 it is May (96). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in TRAPANI BIRGI’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	<1%	28%	5%	33%	13.8–16.5°C
February	2%	30%	6%	37%	13.8–16.8°C
March	12%	24%	4%	27%	15.7–18.5°C
April	37%	18%	3%	15%	18.3–20.9°C
May	81%	10%	2%	5%	21.5–25.3°C
June	96%	4%	<1%	<1%	25.4–29.8°C
July	99%	1%	<1%	<1%	28.4–31.9°C
August	98%	3%	<1%	2%	29.2–32.0°C
September	87%	14%	4%	13%	26.7–29.5°C
October	79%	19%	7%	22%	22.9–25.9°C
November	44%	28%	8%	35%	18.5–21.3°C
December	5%	32%	7%	33%	14.8–17.6°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1967Each stripe is one year’s mean temperature against the 22-year average. Warmest: 2022. Coolest: 1980.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2525083
NOAA station: ITM00016429 · TRAPANI BIRGI
Station distance: 37 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 37.68°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from TRAPANI BIRGI is what differs

Marsala→Trapani→Mazara del Vallo→Alcamo→Casa Santa→Castellammare del Golfo→

Or put two places side by side: Castelvetrano vs Marsala

Best time to visitCastelvetrano.

May

July

April

The whole year,without the guesswork.

Castelvetrano runs +1.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Castelvetrano.

The whole year,
without the guesswork.

Castelvetrano runs +1.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.