Lido di Ostia weather in September

In September, Lido di Ostia sees average daytime highs of 23°C and overnight lows near 20°C, with 86 mm of rain across 7.9 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-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 62% 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 Lido di Ostia's 4th-clearest and 8th-windiest month. For the whole year in context, see Lido di Ostia's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
86 mm
7.9 wet days
Daylight
12 h 18 min
5:57 AM – 6:13 PM
Cloud cover
36%
4th clearest
Wind
13 km/h
8th windiest
Solar energy
4.64 kWh/m²
Travel score
7.6
out of 10

Lido di Ostia is human settlement in Rome, Lazio, Italy.

Density
5,553/km²
people per km²

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 Lido di Ostia reaches about 23°C in the afternoon and slips back to 20°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 25°C. Set against its neighbours, September runs about 3°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12522
22522
32522
42522
52522
62421
72421
82421
92421
102421
112421
122421
132421
142421
152320
162320
172320
182320
192320
202320
212320
222320
232320
242219
252219
262219
272219
282219
292219
302219

Lido di Ostia weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 8110.69.33.4
Feb12° / 789.610.33.4
Mar14° / 10°728.611.74.3
Apr16° / 12°61813.15.3
May19° / 16°40614.37.1
Jun23° / 20°223.3158.5
Jul25° / 23°151.814.79.0
Aug26° / 23°212.613.78.6
Sep23° / 20°867.912.37.6
Oct20° / 17°13210.410.96.6
Nov17° / 13°16113.39.65.0
Dec13° / 10°11511.793.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% 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 (%)
18515
28416
38416
48317
58218
68119
78020
87921
97921
107822
117723
127723
137624
147624
157525
167525
177525
187525
197426
207426
217426
227327
237327
247426
257327
267327
277129
287129
297129
307129

Chance of precipitation in September

Any precipitation

Lido di Ostia gets around 86 mm of rain over 7.9 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 26% and peaks near 31% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
119
219
320
421
522
622
723
824
925
1025
1126
1226
1327
1427
1527
1628
1728
1828
1929
2029
2129
2229
2329
2429
2529
2630
2730
2830
2931
3031

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 35% of days. Sticky, muggy-or-worse air turns up on roughly 43% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
137243827
248253924
348273922
449284020
549294017
6410294115
7511304114
8511304112
9512314211
1051231429
1161331438
1261331437
1361431427
1461531426
1571532415
1671632405
1771733394
1881833374
1981934363
2092034343
2192135333
22102136312
23102237292
24102238282
25112339261
26112440241
27112441231
28112541211
29122642201
30122742181

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 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
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light 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
2714light breeze
2814light breeze
2914light breeze
3014light 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 5:41 AM to 6:12 AM, and sunset from 6:40 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:416:40
212.95:426:38
312.95:436:37
412.85:446:35
512.85:456:33
612.85:466:31
712.75:476:30
812.75:486:28
912.65:506:26
1012.65:516:24
1112.55:526:23
1212.55:536:21
1312.45:546:19
1412.45:556:17
1512.35:566:15
1612.35:576:13
1712.25:586:12
1812.25:596:10
1912.16:006:08
2012.16:016:06
2112.06:026:04
2212.06:036:03
2311.96:046:01
2411.96:065:59
2511.86:075:57
2611.86:085:55
2711.76:095:54
2811.76:105:52
2911.76:115:50
3011.66:125:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.64 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 7.16 kWh/m² in July across the year — September's 4.64 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.4Bright
45.3Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.0Bright
104.9Bright
114.9Bright
124.8Bright
134.8Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.4Bright
204.4Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Lido di Ostia

In seasonPeak

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

Lido di Ostia's rainy season runs September–February, 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 Lido di Ostia?

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

7.6
Sightseeing
4th-best month of the year
6.1
Beach & pool
4th-best month of the year

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

What to pack for Lido di Ostia in September

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

In September, Lido di Ostia sees daytime highs around 23°C and nights near 20°C. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

Sea temperature near Lido di Ostia 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 14 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 31 to Nov 1 — about 5.1 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep24Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Lido di Ostia 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 Lido di Ostia peaks around July 15 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highHighModerateLowJul 15UV 9Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr4Moderate
May7High
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Lido di Ostia?

Lido di Ostia sits at 41.7°N, 12.3°E, 1 m above sea level, in Italy. The nearest listed city is Fiumicino, 5.0 km away.

Topography around Lido di Ostia

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

Within 3 km, the terrain around Lido di Ostia has only modest variations in elevation — a maximum elevation change of 24 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,788 m.

The land around Lido di Ostia is covered by water (45%), grassland (20%) and artificial surfaces (20%) within 3 km, water (56%) within 16 km, and trees (37%) and water (35%) within 80 km.

3 km
24 m
16 km
126 m
80 km
1,788 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Fiumicino 5.0 km · Acilia-Castel Fusano-Ostia Antica 6.0 km · Casal Palocco 6.0 km · Infernetto 7.0 km · Malafede 10 km · Spinaceto 15 km · Torvaianica 20 km · Pomezia 20 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 Lido di Ostia (41.7321°, 12.2765°, elevation 1 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).