Imperia weather in September

In September, Imperia sees average daytime highs of 21°C and overnight lows near 15°C, with 90 mm of rain across 10.5 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 22°C in the first days to 19°C by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Imperia's 3rd-clearest and 8th-windiest month. For the whole year in context, see Imperia's year-round climate.

Daytime high
21°
4th warmest
Overnight low
15°
9th coldest
Rainfall
90 mm
10.5 wet days
Daylight
12 h 18 min
6:13 AM – 6:31 PM
Cloud cover
48%
3rd clearest
Wind
8 km/h
8th windiest
Solar energy
4.39 kWh/m²
Travel score
6.5
out of 10

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 19°C by the end.

A typical September day in Imperia reaches about 21°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 23°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12217
22217
32217
42217
52217
62216
72216
82216
92116
102116
112116
122116
132116
142115
152115
162115
172015
182015
192015
202015
212015
222015
232014
242014
251914
261914
271914
281914
291914
301914

Imperia 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
Jan / 737.23.29.11.7
Feb / 626.83.110.22.0
Mar12° / 7892.111.63.1
Apr14° / 10312.3113.23.9
May17° / 12°8312.4014.55.3
Jun21° / 16°7211.5015.26.4
Jul24° / 18°5510.4014.97.2
Aug24° / 18°5210.9013.87.1
Sep21° / 15°9010.5012.36.5
Oct17° / 12°1089.90.110.85.4
Nov12° / 144101.39.53.3
Dec / 898.12.78.82.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 37%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16733
26832
36733
46733
56733
66733
76634
86733
96634
106634
116535
126535
136436
146436
156337
166238
176238
186238
196238
206139
216040
226040
236040
245941
255842
265842
275743
285743
295545
305545

Chance of precipitation in September

Any precipitation

Imperia gets around 90 mm of rain over 10.5 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 35% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
338
438
537
637
737
836
936
1036
1135
1235
1335
1434
1534
1634
1734
1834
1934
2034
2134
2234
2334
2434
2534
2634
2734
2834
2934
3033

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 39% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
120283516
222303514
323313412
425323310
52633328
62834327
72934316
83035305
93135304
103235293
113336293
123436282
133536272
143735262
153835252
164035242
174135231
184334221
194534201
204634191
214833181
224934171
235034151
245134141
255234131
265334121
275434111
285534101
295534101
30573490

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min 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 90 minutes over September. Sunrise moves from 5:56 AM to 6:30 AM, and sunset from 6:59 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:566:59
213.05:576:58
313.05:586:56
412.95:596:54
512.96:006:52
612.86:026:50
712.86:036:48
812.76:046:46
912.76:056:44
1012.66:066:43
1112.66:076:41
1212.56:096:39
1312.56:106:37
1412.46:116:35
1512.36:126:33
1612.36:136:31
1712.26:146:29
1812.26:166:27
1912.16:176:25
2012.16:186:23
2112.06:196:21
2212.06:206:20
2311.96:226:18
2411.96:236:16
2511.86:246:14
2611.86:256:12
2711.76:266:10
2811.76:286:08
2911.66:296:06
3011.66:306:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.39 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.65 kWh/m² in July across the year — September's 4.39 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.7Bright
104.7Bright
114.6Bright
124.6Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Imperia?

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

6.5
Sightseeing
3rd-best month of the year
3.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Imperia for sightseeing.

What to pack for Imperia in September

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

In September, Imperia sees daytime highs around 21°C and nights near 15°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Imperia in September

The nearest coast averages about 22°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 25°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Oct 12 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Bracing
May18Cool
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep22Refreshing
Oct20Cool
Nov17Cool
Dec15Cool

UV index in Imperia 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 Imperia peaks around July 14 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 14UV 9Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5Moderate
Apr7Very high
May7High
Jun8Very high
Jul9Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

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

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2018 µg/m³Nov 1813 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar19Moderate
Apr18Moderate
May15Moderate
Jun15Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct14Moderate
Nov13Moderate
Dec14Moderate
Location & terrain

Where is Imperia?

Imperia sits at 43.9°N, 8.0°E, 10 m above sea level, in Italy. The nearest listed city is Sanremo, 22 km away.

Topography around Imperia

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

Within 3 km, the terrain around Imperia has significant variations in elevation — a maximum elevation change of 351 m around an average of 72 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,165 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,195 m.

The land around Imperia is covered by trees (40%) and water (38%) within 3 km, water (52%) and trees (39%) within 16 km, and trees (45%) and water (38%) within 80 km.

3 km
351 m
16 km
1,165 m
80 km
3,195 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sanremo 22 km · Albenga 23 km · Ventimiglia 36 km · Menton 45 km · Monte Carlo 52 km · Monaco 52 km · Savona 58 km · Mondovì 59 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 Imperia (43.8892°, 8.0393°, elevation 10 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).