Yalova weather in September

In September, Yalova sees average daytime highs of 24°C and overnight lows near 18°C, with 48 mm of rain across 6.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 67% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Yalova's 4th-clearest and 6th-windiest month. For the whole year in context, see Yalova's year-round climate.

Daytime high
24°
4th warmest
Overnight low
18°
10th coldest
Rainfall
48 mm
6.5 wet days
Daylight
12 h 18 min
5:49 AM – 6:05 PM
Cloud cover
32%
4th clearest
Wind
12 km/h
6th windiest
Solar energy
4.49 kWh/m²
Travel score
8.0
out of 10

Yalova is central district and city in Yalova Province, Turkey.

Air quality
Elevated
PM2.5 18 µg/m³ · 2019

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 26°C in the first days to 22°C by the end.

A typical September day in Yalova reaches about 24°C in the afternoon and slips back to 18°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12620
22620
32620
42619
52519
62519
72519
82519
92519
102519
112519
122519
132419
142418
152418
162418
172418
182418
192418
202318
212318
222318
232317
242317
252317
262317
272217
282217
292217
302217

Yalova weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9012.63.99.41.3
Feb / 7211.83.110.41.6
Mar11° / 7610.61.511.72.7
Apr15° / 528.60.113.14.8
May20° / 14°396.7014.27.1
Jun25° / 18°386.1014.98.0
Jul27° / 21°243.9014.68.2
Aug27° / 21°263.4013.68.2
Sep24° / 18°486.5012.38.0
Oct19° / 15°739.1010.96.4
Nov14° / 10°749.90.39.74.3
Dec10° / 10012.929.12.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% 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 18%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2919
3919
4919
59010
69010
79010
88911
98911
108911
118713
128713
138614
148515
158416
168317
178218
188119
198020
207822
217822
227624
237624
247426
257426
267327
277228
287129
297129
307129

Chance of precipitation in September

Any precipitation

Yalova gets around 48 mm of rain over 6.5 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 21% and peaks near 26% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
117
217
318
418
518
618
718
818
918
1018
1118
1218
1318
1419
1519
1620
1720
1821
1922
2022
2123
2224
2324
2425
2525
2626
2726
2826
2926
3026

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 40% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
162037361
272137331
382337311
492438290
5102539260
6102639240
7112640220
8112741200
9122742190
10122743170
11132843160
12132844150
13132844140
14142844130
15142945130
16142944120
17152944110
18153044110
19163043110
20173043100
21173142100
2218314190
2319324090
2420323980
2521323880
2623333780
2724333670
2825333570
2925333470
3026343360

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
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
1113light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 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 78 minutes over September. Sunrise moves from 5:34 AM to 6:04 AM, and sunset from 6:31 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:346:31
212.95:356:29
312.95:366:28
412.85:376:26
512.85:386:24
612.75:396:23
712.75:406:21
812.65:416:19
912.65:426:17
1012.55:436:16
1112.55:446:14
1212.45:456:12
1312.45:466:10
1412.45:476:09
1512.35:486:07
1612.35:496:05
1712.25:506:03
1812.25:516:02
1912.15:526:00
2012.15:535:58
2112.05:545:56
2212.05:555:55
2311.95:565:53
2411.95:575:51
2511.85:585:49
2611.85:595:48
2711.86:005:46
2811.76:025:44
2911.76:035:43
3011.66:045:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.49 kWh/m².

For context, solar energy here swings from a low near 1.47 kWh/m² to a high of 6.77 kWh/m² in July across the year — September's 4.49 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
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 Yalova?

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

8.0
Sightseeing
3rd-best month of the year
6.6
Beach & pool
4th-best month of the year

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

What to pack for Yalova in September

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

In September, Yalova sees daytime highs around 24°C and nights near 18°C. Worth packing: light clothes. About 7 days see rain.

light clothes

Sea temperature near Yalova 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 at the nearest coast (about 13 km away) is warmest in August at about 24°C and coldest in February near 8°C.

It's comfortable for a long swim from Jun 12 to Oct 6 — about 3.8 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar9Bracing
Apr11Bracing
May16Cool
Jun21Refreshing
Jul23Refreshing
Aug24Warm
Sep22Refreshing
Oct19Cool
Nov15Cool
Dec12Bracing

UV index in Yalova in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yalova peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowJul 17UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr7High
May7High
Jun9Very high
Jul9Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Yalova 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 Yalova is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Yalova's WHO annual average of 18 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2325 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb19Moderate
Mar25Moderate
Apr24Moderate
May23Moderate
Jun19Moderate
Jul15Moderate
Aug15Moderate
Sep15Moderate
Oct15Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Yalova?

Yalova sits at 40.7°N, 29.3°E, 9 m above sea level, in Turkey. The nearest listed city is Orhangazi, 19 km away.

Topography around Yalova

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

Within 3 km, the terrain around Yalova has only modest variations in elevation — a maximum elevation change of 98 m around an average of 19 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 918 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Yalova is covered by artificial surfaces (36%) and water (36%) within 3 km, water (43%) and trees (37%) within 16 km, and trees (44%) and water (32%) within 80 km.

3 km
98 m
16 km
918 m
80 km
2,553 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Orhangazi 19 km · Gebze 21 km · Gemlik 27 km · Karamürsel 29 km · Maltepe 33 km · Sultanbeyli 34 km · Sancaktepe 39 km · Ataşehir 39 km

Turkey travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$18,599
2025
Happiness
5.3 / 10
World Happiness, 2025
Homicide rate
3.2
per 100k, 2023
Road deaths
6.7
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 488
Religion
Muslim 100%other 0%

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 Yalova (40.655°, 29.2769°, elevation 9 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).