Sulmona weather in September

In September, Sulmona sees average daytime highs of 20°C and overnight lows near 10°C, with 90 mm of rain across 11.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels dry.

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 Sulmona's 4th-clearest and 9th-windiest month. For the whole year in context, see Sulmona's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
90 mm
11.3 wet days
Daylight
12 h 18 min
5:50 AM – 6:07 PM
Cloud cover
51%
4th clearest
Wind
4 km/h
9th windiest
Solar energy
4.45 kWh/m²
Travel score
6.2
out of 10

Sulmona 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 22°C in the first days to 18°C by the end.

A typical September day in Sulmona reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 24°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12211
22211
32211
42211
52111
62111
72110
82110
92110
102110
112010
122010
132010
142010
152010
16209
17209
18199
19199
20199
21199
22199
23199
24199
25188
26188
27188
28188
29188
30188

How September really feels in Sulmona

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sulmona weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°8410.97.69.30.0
Feb / -3°7710.97.410.30.2
Mar / -0°9913.76.611.71.6
Apr12° / 10514.72.513.13.0
May17° / 10914.50.114.34.9
Jun21° / 11°7810.90156.7
Jul24° / 13°688.8014.77.7
Aug24° / 13°619.2013.77.5
Sep20° / 10°9011.3012.36.2
Oct16° / 8610.70.410.94.8
Nov10° / 10911.92.69.62.3
Dec / -2°9812.16.690.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17129
26931
36931
46733
56634
66535
76436
86337
96238
106238
116139
126040
136040
145941
155941
165941
175842
185842
195743
205644
215644
225644
235644
245644
255545
265545
275545
285545
295446
305446

Chance of precipitation in September

Any precipitation

Sulmona gets around 90 mm of rain over 11.3 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 38% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
339
439
539
639
739
839
939
1039
1139
1239
1339
1439
1539
1639
1739
1839
1939
2038
2138
2237
2336
2436
2535
2635
2734
2834
2934
3034

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
165332
268302
371281
473261
575241
677221
779201
880191
981181
1082171
1183161
1284160
1385150
1485150
1586140
1686140
1787130
1888120
1988120
2089110
2190100
2290100
239190
249280
259370
269370
279460
289550
299550
309640

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:06 AM, and sunset from 6:34 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:346:34
212.95:356:32
312.95:366:30
412.95:376:29
512.85:386:27
612.85:406:25
712.75:416:23
812.75:426:21
912.65:436:20
1012.65:446:18
1112.55:456:16
1212.55:466:14
1312.45:476:12
1412.45:486:11
1512.35:496:09
1612.35:506:07
1712.25:516:05
1812.25:526:03
1912.15:546:02
2012.15:556:00
2112.05:565:58
2212.05:575:56
2311.95:585:54
2411.95:595:52
2511.86:005:51
2611.86:015:49
2711.76:025:47
2811.76:035:45
2911.66:045:43
3011.66:065:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².

For context, solar energy here swings from a low near 1.66 kWh/m² to a high of 6.77 kWh/m² in July across the year — September's 4.45 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.8Bright
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
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Sulmona?

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

6.2
Sightseeing
4th-best month of the year
3.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sulmona for sightseeing.

What to pack for Sulmona in September

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

In September, Sulmona sees daytime highs around 20°C and nights near 10°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Sulmona 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 52 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from May 31 to Oct 15 — about 4.5 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr14Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep23Refreshing
Oct20Cool
Nov17Cool
Dec15Cool

UV index in Sulmona 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 Sulmona peaks around July 16 at about 10 (extreme) — 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 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highVery highHighModerateLowJul 16UV 10Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5High
Apr5High
May7Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low

Air quality in Sulmona 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 Sulmona is worst in April — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1219 µg/m³Sep 1813 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar18Moderate
Apr19Moderate
May16Moderate
Jun15Moderate
Jul14Moderate
Aug14Moderate
Sep12Moderate
Oct14Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Sulmona?

Sulmona sits at 42.0°N, 13.9°E, 405 m above sea level, in Italy. The nearest listed city is Chieti, 39 km away.

Topography around Sulmona

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

Within 3 km, the terrain around Sulmona has significant variations in elevation — a maximum elevation change of 272 m around an average of 416 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,541 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,846 m.

The land around Sulmona is covered by cropland (30%) and trees (29%) within 3 km, trees (56%) and grassland (31%) within 16 km, and trees (52%) and grassland (21%) within 80 km.

3 km
272 m
16 km
2,541 m
80 km
2,846 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Chieti 39 km · Avezzano 41 km · Lanciano 43 km · Sora 45 km · Francavilla al Mare 51 km · Pescara 51 km · Montesilvano 54 km · L'Aquila 55 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 Sulmona (42.0495°, 13.9258°, elevation 405 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).