Follonica weather in September

In September, Follonica sees average daytime highs of 24°C and overnight lows near 18°C, with 83 mm of rain across 8.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 4th-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 55% 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 Follonica's 4th-clearest and 8th-windiest month. For the whole year in context, see Follonica's year-round climate.

Daytime high
24°
4th warmest
Overnight low
18°
10th coldest
Rainfall
83 mm
8.8 wet days
Daylight
12 h 18 min
6:03 AM – 6:20 PM
Cloud cover
40%
4th clearest
Wind
11 km/h
8th windiest
Solar energy
4.55 kWh/m²
Travel score
7.3
out of 10

Follonica is chief town of the homonym municipality.

Founded
1834

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 Follonica reaches about 24°C in the afternoon and slips back to 18°C overnight — a 6°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
52519
62519
72519
82518
92518
102518
112418
122418
132418
142418
152418
162418
172417
182317
192317
202317
212317
222317
232317
242317
252217
262216
272216
282216
292216
302216

Follonica weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 588.80.49.22.6
Feb11° / 608.40.910.22.9
Mar14° / 578.30.411.64.2
Apr16° / 10°6610.4013.15.2
May20° / 14°548.5014.46.8
Jun24° / 18°365.8015.18.0
Jul27° / 20°203.8014.88.1
Aug28° / 21°274.4013.87.7
Sep24° / 18°838.8012.37.3
Oct20° / 14°10610.4010.86.3
Nov15° / 10°12212.809.54.2
Dec11° / 8410.50.38.92.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18317
28218
38119
48020
58020
67921
77822
87723
97723
107525
117525
127426
137327
147327
157129
167129
177030
186931
196931
206931
216832
226733
236733
246733
256634
266634
276634
286535
296535
306436

Chance of precipitation in September

Any precipitation

Follonica gets around 83 mm of rain over 8.8 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 33% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
122
223
323
424
524
625
726
827
927
1028
1129
1229
1330
1431
1531
1632
1732
1832
1933
2033
2133
2233
2333
2433
2533
2633
2733
2833
2933
3033

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 19% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1121934324
2132034303
3132135283
4142235272
5152235252
6162335242
7162435232
8172435221
9182436221
10182436211
11192336201
12192337201
13202337191
14202337191
15212336181
16222436181
17232435171
18242435161
19252434151
20262534141
21282533131
22282633121
23292732121
24302832110
25302931100
2631303090
2731313080
2832322980
2932322870
3033332870

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:46 AM to 6:19 AM, and sunset from 6:47 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:466:47
213.05:476:46
312.95:486:44
412.95:496:42
512.85:506:40
612.85:516:38
712.75:536:37
812.75:546:35
912.65:556:33
1012.65:566:31
1112.55:576:29
1212.55:586:27
1312.45:596:25
1412.46:006:24
1512.36:026:22
1612.36:036:20
1712.26:046:18
1812.26:056:16
1912.16:066:14
2012.16:076:12
2112.06:086:11
2212.06:096:09
2311.96:116:07
2411.96:126:05
2511.86:136:03
2611.86:146:01
2711.76:155:59
2811.76:165:58
2911.66:175:56
3011.66:195:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.55 kWh/m².

For context, solar energy here swings from a low near 1.55 kWh/m² to a high of 7.12 kWh/m² in July across the year — September's 4.55 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.8Bright
114.8Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Follonica

In seasonPeak

In September, Follonica sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Follonica's rainy season runs September–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Follonica?

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
6.0
Beach & pool
4th-best month of the year

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

What to pack for Follonica in September

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

In September, Follonica sees daytime highs around 24°C and nights near 18°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Follonica 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 at the nearest coast (about 13 km away) 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 26 — about 4.8 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 Follonica 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 Follonica peaks around July 13 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 13UV 9Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr5High
May6High
Jun8Very high
Jul9Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Follonica?

Follonica sits at 42.9°N, 10.8°E, 4 m above sea level, in Italy. The nearest listed city is Piombino, 19 km away.

PoggibonsiLivorno

Topography around Follonica

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Follonica.

Within 3 km, the terrain around Follonica has only modest variations in elevation — a maximum elevation change of 151 m around an average of 21 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 625 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,738 m.

The land around Follonica is covered by water (27%) and grassland (22%) within 3 km, trees (40%) and water (30%) within 16 km, and water (49%) and trees (30%) within 80 km.

3 km
151 m
16 km
625 m
80 km
1,738 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Piombino 19 km · Grosseto 34 km · Cecina 47 km · Rosignano Solvay-Castiglioncello 58 km · Colle di Val d'Elsa 62 km · Siena 63 km · Poggibonsi 68 km · Livorno 77 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 Follonica (42.9278°, 10.7645°, elevation 4 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).