Sapanca weather in September

In September, Sapanca sees average daytime highs of 25°C and overnight lows near 15°C, with 60 mm of rain across 8.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-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 52% of the time in September, and the air most often feels comfortable.

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

Daytime high
25°
4th warmest
Overnight low
15°
9th coldest
Rainfall
60 mm
8.2 wet days
Daylight
12 h 18 min
5:45 AM – 6:01 PM
Cloud cover
41%
4th clearest
Wind
6 km/h
7th windiest
Solar energy
4.5 kWh/m²
Travel score
7.4
out of 10

Sapanca is district and town of Sakarya, Turkey.

Density
146/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 27°C in the first days to 23°C by the end.

A typical September day in Sapanca reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12717
22717
32716
42616
52616
62616
72616
82616
92616
102615
112615
122515
132515
142515
152515
162515
172515
182515
192515
202514
212414
222414
232414
242414
252414
262414
272413
282313
292313
302313

How September really feels in Sapanca

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.

Sapanca weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9813.36.69.41.2
Feb10° / 8812.95.610.41.8
Mar13° / 9713.63.211.73.1
Apr17° / 7911.70.613.15.3
May22° / 11°7810.6014.26.7
Jun26° / 15°7710.3014.97.1
Jul28° / 18°426.3014.67.2
Aug28° / 18°426.1013.66.9
Sep25° / 15°608.2012.37.4
Oct20° / 11°8910.4010.96.3
Nov15° / 779.919.74.4
Dec / 1041349.11.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% 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 30%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27723
37723
47723
57723
67624
77624
87525
97525
107525
117426
127327
137327
147228
157030
167030
176931
186931
196832
206733
216733
226634
236535
246535
256535
266337
276337
286337
296238
306238

Chance of precipitation in September

Any precipitation

Sapanca gets around 60 mm of rain over 8.2 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 26% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
226
326
426
526
625
725
824
924
1023
1123
1223
1323
1423
1524
1624
1725
1826
1926
2027
2128
2229
2329
2430
2531
2631
2731
2831
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
182539261
292639241
3102839221
4112939201
5123039180
6133139170
7143140150
8143240140
9153340120
10153340110
11163440100
1216344090
1317354090
1417354080
1518353980
1619363870
1719363770
1820373670
1921373560
2022383460
2124383260
2225393150
2327392940
2428402840
2530402730
2632402530
2733412420
2835412320
2936412220
3037402020

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 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
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:30 AM to 6:00 AM, and sunset from 6:27 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:306:27
212.95:316:25
312.95:326:24
412.85:336:22
512.85:346:20
612.75:356:19
712.75:366:17
812.65:376:15
912.65:386:13
1012.55:396:12
1112.55:406:10
1212.45:416:08
1312.45:426:06
1412.45:436:05
1512.35:446:03
1612.35:456:01
1712.25:465:59
1812.25:475:58
1912.15:485:56
2012.15:495:54
2112.05:505:52
2212.05:515:51
2311.95:525:49
2411.95:535:47
2511.85:545:45
2611.85:555:44
2711.85:575:42
2811.75:585:40
2911.75:595:39
3011.66:005:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 1.52 kWh/m² to a high of 6.68 kWh/m² in July across the year — September's 4.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
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 Sapanca?

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

7.4
Sightseeing
1st-best month of the year
6.7
Beach & pool
3rd-best month of the year

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

What to pack for Sapanca in September

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

In September, Sapanca sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Sapanca 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 50 km away) is warmest in August at about 25°C and coldest in February near 7°C.

It's comfortable for a long swim from Jun 11 to Oct 10 — about 4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb7Bracing
Mar8Bracing
Apr10Bracing
May16Cool
Jun21Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct19Cool
Nov15Cool
Dec11Bracing

UV index in Sapanca 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 Sapanca peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highHighModerateLowAug 10UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7High
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Sapanca 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 Sapanca is worst in March — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMar 2316 µg/m³Dec 198 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar16Moderate
Apr16Moderate
May15Moderate
Jun13Moderate
Jul10Good
Aug10Good
Sep10Good
Oct10Good
Nov10Good
Dec8Good
Location & terrain

Where is Sapanca?

Sapanca sits at 40.7°N, 30.3°E, 47 m above sea level, in Turkey. The nearest listed city is Adapazarı, 15 km away.

Topography around Sapanca

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

Within 3 km, the terrain around Sapanca has significant variations in elevation — a maximum elevation change of 533 m around an average of 109 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,573 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.

The land around Sapanca is covered by trees (51%) and water (34%) within 3 km, trees (71%) within 16 km, and trees (57%) within 80 km.

3 km
533 m
16 km
1,573 m
80 km
1,820 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Adapazarı 15 km · Geyve 21 km · İzmit 30 km · Akyazı 30 km · Ferizli 33 km · Gölcük 38 km · Derince 39 km · Körfez 42 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 Sapanca (40.6914°, 30.2674°, elevation 47 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).