Acilia-Castel Fusano-Ostia Antica weather in May

In May, Acilia-Castel Fusano-Ostia Antica sees average daytime highs of 19°C and overnight lows near 16°C, with 40 mm of rain across 6 wet days and about 14.3 hours of daylight. It is the 6th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 54% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 13 h 48 min at the start of May to 14 h 48 min by month's end. Set against the rest of the year, May is Acilia-Castel Fusano-Ostia Antica's 5th-clearest and 9th-windiest month. For the whole year in context, see Acilia-Castel Fusano-Ostia Antica's year-round climate.

Daytime high
19°
6th warmest
Overnight low
16°
7th coldest
Rainfall
40 mm
6 wet days
Daylight
14 h 18 min
4:56 AM – 7:17 PM
Cloud cover
40%
5th clearest
Wind
13 km/h
9th windiest
Solar energy
6.51 kWh/m²
Travel score
7.1
out of 10

Acilia-Castel Fusano-Ostia Antica is settlement in Rome.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 21°C by the end.

A typical May day in Acilia-Castel Fusano-Ostia Antica reaches about 19°C in the afternoon and slips back to 16°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11714
21814
31815
41815
51815
61815
71815
81815
91815
101915
111916
121916
131916
141916
151916
161916
171916
182016
192016
202017
212017
222017
232017
242017
252017
262017
272117
282117
292118
302118
312118

Acilia-Castel Fusano-Ostia Antica weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 9th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

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

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26337
36436
46436
56535
66535
76634
86634
96832
106832
116832
126931
136931
147030
157129
167129
177228
187228
197228
207327
217327
227426
237426
247426
257525
267525
277525
287426
297426
307525
317525

Chance of precipitation in May

Any precipitation

Acilia-Castel Fusano-Ostia Antica gets around 40 mm of rain over 6 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 20% and peaks near 26% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
126
226
325
425
525
624
724
824
923
1023
1122
1222
1321
1420
1520
1619
1719
1818
1918
2017
2117
2216
2316
2415
2515
2615
2715
2814
2914
3014
3114

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the comfortable band about 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1474940
2445150
3415360
4395380
5375490
63455110
73355120
83155140
93054160
102854180
112753200
122653210
132651230
142550250
152448271
162447291
172345302
182244322
192242343
202141353
212039364
221938385
231937396
241736407
251635418
261534439
2714324410
2813314512
2911304613
3010294615
319274617

Wind in May

Winds average 13 km/h in May.

Across May, 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.

05101520151015202531
Wind speed (km/h)Feels
114light 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
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 5:14 AM to 4:45 AM, and sunset from 7:01 PM to 7:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:147:01
213.85:137:02
313.95:127:03
413.95:107:05
513.95:097:06
614.05:087:07
714.05:077:08
814.15:057:09
914.15:047:10
1014.15:037:11
1114.25:027:12
1214.25:017:13
1314.25:007:14
1414.34:597:15
1514.34:577:16
1614.34:567:17
1714.44:557:18
1814.44:557:19
1914.44:547:20
2014.54:537:21
2114.54:527:22
2214.54:517:23
2314.64:507:24
2414.64:497:25
2514.64:497:26
2614.74:487:27
2714.74:477:28
2814.74:477:29
2914.74:467:30
3014.84:457:31
3114.84:457:31

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.51 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 — May's 6.51 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Intense
36.0Intense
46.1Intense
56.1Intense
66.2Intense
76.2Intense
86.2Intense
96.3Intense
106.3Intense
116.3Intense
126.4Intense
136.4Intense
146.4Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.6Intense
206.6Intense
216.6Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.8Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in May

Hazard calendar for Acilia-Castel Fusano-Ostia Antica

In seasonPeak

None of Acilia-Castel Fusano-Ostia Antica's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Acilia-Castel Fusano-Ostia Antica'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 May a good time to visit Acilia-Castel Fusano-Ostia Antica?

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

7.1
Sightseeing
5th-best month of the year
3.2
Beach & pool
6th-best month of the year

May is one of the better times to visit Acilia-Castel Fusano-Ostia Antica for general sightseeing.

What to pack for Acilia-Castel Fusano-Ostia Antica in May

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

In May, Acilia-Castel Fusano-Ostia Antica sees daytime highs around 19°C and nights near 16°C. Pack sun protection. About 6 days see rain.

sun protection

Sea temperature near Acilia-Castel Fusano-Ostia Antica in May

The nearest coast averages about 18°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 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 Acilia-Castel Fusano-Ostia Antica in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Acilia-Castel Fusano-Ostia Antica 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 Acilia-Castel Fusano-Ostia Antica?

Acilia-Castel Fusano-Ostia Antica sits at 41.8°N, 12.3°E, 5 m above sea level, in Italy. The nearest listed city is Casal Palocco, 2.0 km away.

Topography around Acilia-Castel Fusano-Ostia Antica

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Acilia-Castel Fusano-Ostia Antica.

Within 3 km, the terrain around Acilia-Castel Fusano-Ostia Antica has only modest variations in elevation — a maximum elevation change of 53 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 135 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,840 m.

The land around Acilia-Castel Fusano-Ostia Antica is covered by artificial surfaces (37%) and grassland (29%) within 3 km, water (34%) and trees (21%) within 16 km, and trees (39%) and water (33%) within 80 km.

3 km
53 m
16 km
135 m
80 km
1,840 m
treesshrubsgrasslandcroplandartificial surfaceswater
May weather nearby: Casal Palocco 2.0 km · Malafede 4.0 km · Infernetto 4.0 km · Lido di Ostia 6.0 km · Fiumicino 8.0 km · Spinaceto 9.0 km · Pomezia 18 km · Vatican City 19 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 Acilia-Castel Fusano-Ostia Antica (41.7634°, 12.3308°, elevation 5 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).