Sezze weather in September

In September, Sezze sees average daytime highs of 25°C and overnight lows near 17°C, with 89 mm of rain across 9.8 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 27°C in the first days to 23°C by the end. The sky is clear or mostly clear about 53% 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 Sezze's 4th-clearest and 11th-windiest month. For the whole year in context, see Sezze's year-round climate.

Daytime high
25°
4th warmest
Overnight low
17°
9th coldest
Rainfall
89 mm
9.8 wet days
Daylight
12 h 18 min
5:54 AM – 6:10 PM
Cloud cover
43%
4th clearest
Wind
7 km/h
11th windiest
Solar energy
4.62 kWh/m²
Travel score
7.0
out of 10

Sezze 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 27°C in the first days to 23°C by the end.

A typical September day in Sezze reaches about 25°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12818
22818
32718
42718
52718
62718
72718
82718
92617
102617
112617
122617
132617
142617
152517
162517
172517
182516
192516
202516
212416
222416
232416
242416
252416
262415
272415
282315
292315
302315

Sezze 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 daysDaylight (hours)Travel score
Jan12° / 819.89.33.1
Feb12° / 8510.110.33.4
Mar15° / 8610.111.74.6
Apr18° / 8511.313.15.6
May22° / 13°65914.37.0
Jun26° / 17°356.114.97.6
Jul29° / 19°234.314.76.7
Aug30° / 20°244.713.76.3
Sep25° / 17°899.812.37.0
Oct21° / 13°12710.610.96.6
Nov16° / 155139.74.8
Dec13° / 11511.29.13.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28119
38020
47921
57822
67723
77624
87525
97426
107426
117327
127228
137228
147129
157129
167030
177030
187030
196931
206931
216931
226832
236832
246733
256733
266634
276634
286535
296535
306535

Chance of precipitation in September

Any precipitation

Sezze gets around 89 mm of rain over 9.8 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 33% and peaks near 36% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
125
226
326
427
528
629
730
830
931
1032
1132
1233
1334
1434
1535
1635
1736
1836
1936
2036
2136
2236
2335
2435
2535
2635
2735
2835
2935
3035

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 22% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
141339422
241539402
341640382
451741361
551842341
651943321
752044301
852145281
962145270
1062246260
1162346250
1262446240
1372446230
1472546220
1572646210
1682746200
1782845190
1892945180
1993044160
20103143160
21113242150
22123342140
23123441130
24133540120
25133739110
26133839100
2714403890
2814413780
2915423770
3015433660

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:38 AM to 6:09 AM, and sunset from 6:37 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:386:37
212.95:396:35
312.95:406:33
412.85:416:32
512.85:426:30
612.75:436:28
712.75:446:26
812.75:456:25
912.65:476:23
1012.65:486:21
1112.55:496:19
1212.55:506:17
1312.45:516:16
1412.45:526:14
1512.35:536:12
1612.35:546:10
1712.25:556:08
1812.25:566:07
1912.15:576:05
2012.15:586:03
2112.05:596:01
2212.06:006:00
2311.96:015:58
2411.96:025:56
2511.86:035:54
2611.86:045:52
2711.86:065:51
2811.76:075:49
2911.76:085:47
3011.66:095:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.62 kWh/m².

For context, solar energy here swings from a low near 1.69 kWh/m² to a high of 7.12 kWh/m² in July across the year — September's 4.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.1Bright
85.0Bright
95.0Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
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 Sezze

In seasonPeak

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

Sezze's rainy season runs September–April, 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 Sezze?

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

7.0
Sightseeing
2nd-best month of the year
6.5
Beach & pool
4th-best month of the year

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

What to pack for Sezze in September

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

In September, Sezze sees daytime highs around 25°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Sezze 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 21 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 29 to Nov 4 — about 5.3 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep24Refreshing
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Sezze 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 Sezze peaks around July 15 at about 10 (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 highModerateLowJul 15UV 10Dec 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 Sezze?

Sezze sits at 41.5°N, 13.1°E, 319 m above sea level, in Italy. The nearest listed city is Latina, 14 km away.

Topography around Sezze

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

Within 3 km, the terrain around Sezze has large variations in elevation — a maximum elevation change of 633 m around an average of 203 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,529 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,452 m.

The land around Sezze is covered by trees (56%) within 3 km, trees (48%) and cropland (26%) within 16 km, and trees (38%) and water (37%) within 80 km.

3 km
633 m
16 km
1,529 m
80 km
2,452 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Latina 14 km · Cisterna di Latina 22 km · Sabaudia 22 km · Colleferro 26 km · Terracina 28 km · Frosinone 28 km · Velletri 31 km · Nettuno 33 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 Sezze (41.5003°, 13.0618°, 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).