Rovinj weather in September

In September, Rovinj sees average daytime highs of 22°C and overnight lows near 18°C, with 121 mm of rain across 9.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 51% of the time in September, and the air most often feels humid.

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 Rovinj's 4th-clearest and 7th-windiest month. For the whole year in context, see Rovinj's year-round climate.

Daytime high
22°
4th warmest
Overnight low
18°
9th coldest
Rainfall
121 mm
9.6 wet days
Daylight
12 h 18 min
5:50 AM – 6:09 PM
Cloud cover
43%
4th clearest
Wind
14 km/h
7th windiest
Solar energy
4.32 kWh/m²
Travel score
7.0
out of 10

Rovinj is town and settlement in Istria County, Croatia.

Density
186/km²
people per km²

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 24°C in the first days to 20°C by the end.

A typical September day in Rovinj reaches about 22°C in the afternoon and slips back to 18°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°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°151015202530
Avg high (°C)Avg low (°C)
12520
22420
32420
42420
52420
62420
72420
82319
92319
102319
112319
122319
132319
142219
152218
162218
172218
182218
192218
202118
212118
222117
232117
242117
252117
262117
272017
282017
292017
302017

Rovinj weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7490.491.7
Feb / 818.70.910.11.9
Mar12° / 728.90.411.63.2
Apr15° / 11°709.50.113.24.6
May19° / 15°759.5014.66.4
Jun24° / 20°547.6015.47.6
Jul26° / 22°435.7015.17.8
Aug26° / 22°647.2013.97.6
Sep22° / 18°1219.6012.37.0
Oct18° / 15°11611.1010.75.8
Nov14° / 11°14712.809.33.7
Dec10° / 10610.70.58.62.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17129
27030
37030
47030
57129
67030
77030
87030
97030
106931
116832
126931
136832
146832
156733
166634
176634
186535
196535
206337
216337
226337
236337
246337
256238
266238
276238
286238
296238
306139

Chance of precipitation in September

Any precipitation

Rovinj gets around 121 mm of rain over 9.6 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 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
229
329
430
530
631
731
832
933
1033
1134
1234
1335
1435
1535
1635
1735
1835
1935
2035
2135
2234
2334
2433
2533
2633
2734
2834
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 31% of days. Sticky, muggy-or-worse air turns up on roughly 18% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1142129296
2152130285
3162230275
4172231264
5182231244
6192231243
7202232233
8212232223
9232132222
10242132212
11252033202
12262033201
13272033191
14292032181
15302032171
16312032161
17322031151
18342131141
19352130130
20362229120
21372229110
22382329100
2339242990
2439242980
2539252970
2639262960
2739262950
2840272950
2940272940
3040272940

Wind in September

Winds average 14 km/h in September.

Across September, 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.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

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 5:32 AM to 6:08 AM, and sunset from 6:38 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:326:38
213.15:336:36
313.05:346:35
413.05:366:33
512.95:376:31
612.85:386:29
712.85:396:27
812.75:416:25
912.75:426:23
1012.65:436:21
1112.65:446:19
1212.55:466:17
1312.55:476:15
1412.45:486:13
1512.45:496:11
1612.35:506:09
1712.35:526:07
1812.25:536:05
1912.15:546:03
2012.15:556:01
2112.05:575:59
2212.05:585:57
2311.95:595:55
2411.96:005:53
2511.86:025:51
2611.86:035:49
2711.76:045:47
2811.76:065:45
2911.66:075:43
3011.66:085:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.32 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 6.82 kWh/m² in June across the year — September's 4.32 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.8Bright
74.8Bright
84.7Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.1Bright
204.0Bright
214.0Bright
224.0Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Rovinj?

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

7.0
Sightseeing
4th-best month of the year
4.9
Beach & pool
4th-best month of the year

September is one of the better times to visit Rovinj for general sightseeing.

What to pack for Rovinj in September

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

In September, Rovinj sees daytime highs around 22°C and nights near 18°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Rovinj 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 offshore is warmest in August at about 26°C and coldest in February near 10°C.

It's comfortable for a long swim from Jun 1 to Oct 12 — about 4.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb10Bracing
Mar11Bracing
Apr13Bracing
May18Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep23Refreshing
Oct20Cool
Nov17Cool
Dec14Bracing

UV index in Rovinj 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 Rovinj peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 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 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr7High
May7High
Jun8Very high
Jul9Very high
Aug8Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Rovinj?

Rovinj sits at 45.1°N, 13.6°E, 0 m above sea level, in Croatia. The nearest listed city is Pula, 29 km away.

PulaPiranKoperCresTriesteRijekaDivačaMonfalcone

Topography around Rovinj

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

Within 3 km, the terrain around Rovinj has only modest variations in elevation — a maximum elevation change of 70 m around an average of 11 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 301 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,494 m.

The land around Rovinj is covered by water (52%) and trees (22%) within 3 km, water (57%) and trees (29%) within 16 km, and water (60%) and trees (31%) within 80 km.

3 km
70 m
16 km
301 m
80 km
1,494 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Pula 29 km · Piran 50 km · Koper 52 km · Cres 63 km · Trieste 64 km · Rijeka 69 km · Divača 72 km · Monfalcone 81 km

Croatia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 53% of US
price level, 2025
GDP per capita
$27,104
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
87%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
7.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 617
Religion
Roman Catholic 79%other Christian 5%none or atheist 5%Orthodox 3%

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 Rovinj (45.0827°, 13.6346°, elevation 0 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).