Forio weather in September

In September, Forio sees average daytime highs of 24°C and overnight lows near 22°C, with 73 mm of rain across 7.7 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 22°C by the end. The sky is clear or mostly clear about 64% of the time in September, and the air most often feels muggy.

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 Forio's 4th-clearest and 8th-windiest month. For the whole year in context, see Forio's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
73 mm
7.7 wet days
Daylight
12 h 18 min
5:51 AM – 6:07 PM
Cloud cover
35%
4th clearest
Wind
14 km/h
8th windiest
Solar energy
4.79 kWh/m²
Travel score
7.7
out of 10

Forio is chief town of the homonym municipality.

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 25°C in the first days to 22°C by the end.

A typical September day in Forio reaches about 24°C in the afternoon and slips back to 22°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 25°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12524
22523
32523
42523
52523
62523
72523
82423
92423
102422
112422
122422
132422
142422
152422
162422
172422
182322
192321
202321
212321
222321
232321
242321
252321
262321
272321
282221
292220
302220

Forio weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan13° / 11°9610.99.43.6
Feb13° / 11°829.910.43.5
Mar14° / 12°73911.74.2
Apr16° / 14°567.813.15.3
May19° / 17°325.114.27.2
Jun23° / 21°152.514.98.6
Jul25° / 24°91.414.69.1
Aug26° / 25°162.113.68.7
Sep24° / 22°737.712.37.7
Oct21° / 19°1049.910.96.7
Nov17° / 15°15613.49.75.3
Dec14° / 12°12512.49.14.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 64% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18614
28515
38416
48317
58218
68119
78119
87921
97921
107822
117822
127723
137624
147624
157525
167525
177525
187525
197426
207426
217426
227327
237327
247327
257228
267129
277129
287129
297129
307030

Chance of precipitation in September

Any precipitation

Forio gets around 73 mm of rain over 7.7 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 26% and peaks near 30% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
115
216
317
418
519
620
721
822
923
1024
1124
1225
1326
1427
1528
1628
1729
1829
1930
2030
2130
2230
2330
2430
2530
2629
2729
2829
2929
3029

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1482334291
2492435271
34102635251
45102736221
55112736200
65122837180
75122937170
85132938150
96133038140
106133039130
116143039120
126143039110
137153039100
14716303890
15717303790
16718303680
17819313580
18820313480
19921313270
20923313170
21924312970
221025312860
231026312760
241027322560
251128322450
261128332350
271129332240
281130342140
291130342040
301231352030

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

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 5:36 AM to 6:05 AM, and sunset from 6:33 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:366:33
212.95:376:31
312.95:386:29
412.85:396:28
512.85:406:26
612.75:416:24
712.75:426:23
812.65:436:21
912.65:446:19
1012.55:456:17
1112.55:466:16
1212.55:476:14
1312.45:486:12
1412.45:496:10
1512.35:506:09
1612.35:516:07
1712.25:526:05
1812.25:536:03
1912.15:546:02
2012.15:556:00
2112.05:565:58
2212.05:575:56
2311.95:585:55
2411.95:595:53
2511.86:005:51
2611.86:015:49
2711.86:025:48
2811.76:035:46
2911.76:045:44
3011.66:055:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.79 kWh/m².

For context, solar energy here swings from a low near 1.76 kWh/m² to a high of 7.23 kWh/m² in June across the year — September's 4.79 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.3Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
134.9Bright
144.9Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.6Bright
204.5Bright
214.5Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Forio

In seasonPeak

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

Forio's rainy season runs September–March, 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 Forio?

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

7.7
Sightseeing
4th-best month of the year
6.3
Beach & pool
4th-best month of the year

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

What to pack for Forio in September

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

In September, Forio sees daytime highs around 24°C and nights near 22°C. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

Sea temperature near Forio in September

The nearest coast averages about 24°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 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 27 to Nov 5 — about 5.4 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun23Refreshing
Jul25Warm
Aug26Warm
Sep24Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Forio in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Forio peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highHighModerateLowJul 16UV 9Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr4Moderate
May7High
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Forio?

Forio sits at 40.7°N, 13.9°E, 18 m above sea level, in Italy. The nearest listed city is Ischia, 7.0 km away.

Topography around Forio

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

Within 3 km, the terrain around Forio has large variations in elevation — a maximum elevation change of 761 m around an average of 78 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 761 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,574 m.

The land around Forio is covered by water (56%) and trees (30%) within 3 km, water (94%) within 16 km, and water (63%) and trees (22%) within 80 km.

3 km
761 m
16 km
761 m
80 km
1,574 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Ischia 7.0 km · Ischia Porto 8.0 km · Bacoli 19 km · Pozzuoli 23 km · Monterusciello 24 km · Bagnoli 27 km · Quarto 29 km · Pianura 30 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 Forio (40.7376°, 13.86°, elevation 18 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).