Rosignano Solvay-Castiglioncello weather in September

In September, Rosignano Solvay-Castiglioncello sees average daytime highs of 24°C and overnight lows near 17°C, with 98 mm of rain across 8.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 54% of the time in September, and the air most often feels humid.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Rosignano Solvay-Castiglioncello's 4th-clearest and 8th-windiest month. For the whole year in context, see Rosignano Solvay-Castiglioncello's year-round climate.

Daytime high
24°
4th warmest
Overnight low
17°
9th coldest
Rainfall
98 mm
8.9 wet days
Daylight
12 h 18 min
6:04 AM – 6:21 PM
Cloud cover
41%
4th clearest
Wind
8 km/h
8th windiest
Solar energy
4.46 kWh/m²
Travel score
7.3
out of 10

Rosignano Solvay-Castiglioncello is borough of Rosignano Marittimo, Tuscany, Italy.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 22°C by the end.

A typical September day in Rosignano Solvay-Castiglioncello reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12619
22619
32619
42619
52619
62619
72618
82518
92518
102518
112518
122518
132518
142518
152417
162417
172417
182417
192417
202417
212317
222317
232316
242316
252316
262316
272316
282216
292216
302216

Rosignano Solvay-Castiglioncello weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 638.80.39.22.5
Feb11° / 658.60.610.22.8
Mar14° / 638.60.211.64.2
Apr17° / 10°7610.3013.25.3
May21° / 14°638.4014.56.8
Jun25° / 18°466.3015.27.8
Jul28° / 21°243.2014.97.9
Aug28° / 21°374.9013.87.4
Sep24° / 17°988.9012.37.3
Oct20° / 14°12411.4010.86.2
Nov15° / 10°12613.109.54.2
Dec11° / 8610.50.38.82.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38119
48020
58020
67921
77822
87624
97525
107426
117327
127129
137129
146931
156931
166832
176733
186733
196634
206634
216535
226535
236535
246436
256436
266436
276436
286436
296337
306238

Chance of precipitation in September

Any precipitation

Rosignano Solvay-Castiglioncello gets around 98 mm of rain over 8.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 36% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
123
224
324
425
525
626
726
827
928
1028
1129
1230
1330
1431
1531
1632
1732
1832
1933
2033
2133
2233
2333
2434
2534
2634
2734
2835
2935
3036

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1617293612
2718303510
381931349
482032337
592132326
6102133315
7102234304
8112234304
9112235293
10122235293
11132235282
12132235282
13142235281
14142235271
15152335261
16152335251
17162434251
18172534231
19182534221
20182634211
21192734201
22202834190
23202834170
24212934160
25213034150
26213134130
27223234120
28233334110
29233334100
3024343490

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:47 AM to 6:20 AM, and sunset from 6:49 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:476:49
213.05:486:47
312.95:496:46
412.95:506:44
512.85:516:42
612.85:526:40
712.75:546:38
812.75:556:36
912.65:566:35
1012.65:576:33
1112.55:586:31
1212.55:596:29
1312.46:006:27
1412.46:026:25
1512.36:036:23
1612.36:046:21
1712.26:056:19
1812.26:066:18
1912.16:076:16
2012.16:086:14
2112.06:106:12
2212.06:116:10
2311.96:126:08
2411.96:136:06
2511.86:146:04
2611.86:156:02
2711.76:176:01
2811.76:185:59
2911.66:195:57
3011.66:205:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.46 kWh/m².

For context, solar energy here swings from a low near 1.44 kWh/m² to a high of 7 kWh/m² in July across the year — September's 4.46 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
84.9Bright
94.8Bright
104.8Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Rosignano Solvay-Castiglioncello?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.3
Sightseeing
4th-best month of the year
6.2
Beach & pool
4th-best month of the year

September is one of the better times to visit Rosignano Solvay-Castiglioncello for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rosignano Solvay-Castiglioncello in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Rosignano Solvay-Castiglioncello sees daytime highs around 24°C and nights near 17°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Rosignano Solvay-Castiglioncello in September

The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 25°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 3 to Oct 22 — about 4.7 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct21Refreshing
Nov18Cool
Dec16Cool

UV index in Rosignano Solvay-Castiglioncello in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rosignano Solvay-Castiglioncello peaks around July 12 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 12UV 9Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr6High
May6High
Jun8Very high
Jul9Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Rosignano Solvay-Castiglioncello?

Rosignano Solvay-Castiglioncello sits at 43.4°N, 10.4°E, 13 m above sea level, in Italy. The nearest listed city is Cecina, 11 km away.

Topography around Rosignano Solvay-Castiglioncello

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rosignano Solvay-Castiglioncello.

Within 3 km, the terrain around Rosignano Solvay-Castiglioncello has only modest variations in elevation — a maximum elevation change of 178 m around an average of 25 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 672 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,823 m.

The land around Rosignano Solvay-Castiglioncello is covered by water (37%) and trees (21%) within 3 km, water (45%) and trees (27%) within 16 km, and water (46%) and trees (35%) within 80 km.

3 km
178 m
16 km
672 m
80 km
1,823 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Cecina 11 km · Livorno 19 km · Cascina 33 km · Pontedera 34 km · Pisa 36 km · San Miniato 46 km · San Miniato Basso 47 km · Lucca 51 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%other 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rosignano Solvay-Castiglioncello (43.3895°, 10.4361°, elevation 13 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).