Fermo weather in September

In September, Fermo sees average daytime highs of 24°C and overnight lows near 19°C, with 57 mm of rain across 7.6 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 25°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 Fermo's 4th-clearest and 7th-windiest month. For the whole year in context, see Fermo's year-round climate.

Daytime high
24°
4th warmest
Overnight low
19°
9th coldest
Rainfall
57 mm
7.6 wet days
Daylight
12 h 18 min
5:51 AM – 6:08 PM
Cloud cover
40%
4th clearest
Wind
11 km/h
7th windiest
Solar energy
4.44 kWh/m²
Travel score
7.5
out of 10

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 Fermo reaches about 24°C in the afternoon and slips back to 19°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12621
22521
32521
42521
52521
62521
72520
82520
92420
102420
112420
122420
132420
142420
152419
162319
172319
182319
192319
202319
212319
222319
232218
242218
252218
262218
272218
282218
292218
302118

Fermo 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° / 529.10.59.22.5
Feb11° / 518.70.510.22.6
Mar13° / 608.40.211.63.7
Apr16° / 11°548.7013.15.1
May20° / 16°497.6014.46.9
Jun25° / 20°305.5015.18.0
Jul27° / 23°233.8014.98.1
Aug27° / 23°335013.87.8
Sep24° / 19°577.6012.37.5
Oct19° / 16°568.2010.86.5
Nov15° / 12°7010.309.54.5
Dec12° / 7010.50.28.93.0

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 29%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27822
37723
47723
57624
67624
77426
87426
97327
107327
117228
127129
137129
147129
157030
166931
176832
186832
196832
206832
216832
226832
236832
246832
256832
266733
276733
286634
296634
306535

Chance of precipitation in September

Any precipitation

Fermo gets around 57 mm of rain over 7.6 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 27% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
124
224
324
425
525
625
725
825
925
1025
1126
1226
1326
1426
1526
1627
1727
1827
1927
2027
2127
2227
2327
2426
2526
2626
2726
2826
2926
3027

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 28% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1815293612
2915303511
3101531349
4111632338
5121633327
6131633316
7131634315
8141734315
9151734304
10151734303
11161734303
12161834293
13171834292
14171933282
15182033282
16182133272
17192132262
18202232251
19212332241
20222332221
21232432211
22232532191
23242532181
24252632160
25262633150
26262733140
27272733120
28272833110
29282834100
3028293490

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 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
111calm
211calm
311calm
411calm
511calm
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 5:34 AM to 6:07 AM, and sunset from 6:36 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:346:36
213.05:356:34
312.95:366:32
412.95:376:30
512.85:386:29
612.85:396:27
712.75:416:25
812.75:426:23
912.65:436:21
1012.65:446:19
1112.55:456:18
1212.55:466:16
1312.45:476:14
1412.45:486:12
1512.35:506:10
1612.35:516:08
1712.25:526:06
1812.25:536:04
1912.15:546:02
2012.15:556:01
2112.05:565:59
2212.05:585:57
2311.95:595:55
2411.96:005:53
2511.86:015:51
2611.86:025:49
2711.76:035:47
2811.76:055:46
2911.66:065:44
3011.66:075:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.44 kWh/m².

For context, solar energy here swings from a low near 1.47 kWh/m² to a high of 6.87 kWh/m² in July across the year — September's 4.44 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.0Bright
254.0Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit Fermo?

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

7.5
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 Fermo for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Fermo in September

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

In September, Fermo sees daytime highs around 24°C and nights near 19°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Fermo 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 26°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 1 to Oct 13 — about 4.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep23Refreshing
Oct20Cool
Nov17Cool
Dec15Bracing

UV index in Fermo 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 Fermo peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 16UV 9Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Fermo in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Fermo is worst in March — around 17 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (September, 11 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodGoodMar 1917 µg/m³Sep 1411 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb16Moderate
Mar17Moderate
Apr17Moderate
May14Moderate
Jun14Moderate
Jul12Good
Aug12Good
Sep11Good
Oct13Moderate
Nov11Good
Dec11Good
Location & terrain

Where is Fermo?

Fermo sits at 43.2°N, 13.7°E, 319 m above sea level, in Italy. The nearest listed city is Porto San Giorgio, 6.0 km away.

Topography around Fermo

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

Within 3 km, the terrain around Fermo has significant variations in elevation — a maximum elevation change of 299 m around an average of 129 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 465 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,847 m.

The land around Fermo is covered by cropland (49%) and grassland (20%) within 3 km, cropland (34%) and water (25%) within 16 km, and trees (32%), water (30%) and cropland (20%) within 80 km.

3 km
299 m
16 km
465 m
80 km
2,847 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Porto San Giorgio 6.0 km · Porto Sant'Elpidio 10 km · Civitanova Marche 16 km · San Benedetto del Tronto 26 km · Macerata 27 km · Tolentino 36 km · Ascoli Piceno 36 km · Osimo 41 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 Fermo (43.163°, 13.7227°, elevation 319 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).