Düzce weather in September

In September, Düzce sees average daytime highs of 22°C and overnight lows near 11°C, with 73 mm of rain across 8.9 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 20°C by the end. The sky is clear or mostly clear about 48% of the time in September, and the air most often feels dry.

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 Düzce's 3rd-clearest and 9th-windiest month. For the whole year in context, see Düzce's year-round climate.

Daytime high
22°
3rd warmest
Overnight low
11°
9th coldest
Rainfall
73 mm
8.9 wet days
Daylight
12 h 18 min
5:42 AM – 5:58 PM
Cloud cover
44%
3rd clearest
Wind
5 km/h
9th windiest
Solar energy
4.71 kWh/m²
Travel score
7.1
out of 10

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

Air quality
Very high
PM2.5 44.6 µg/m³ · 2019
Density
263/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 23°C in the first days to 20°C by the end.

A typical September day in Düzce reaches about 22°C in the afternoon and slips back to 11°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°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)
12413
22413
32413
42312
52312
62312
72312
82312
92312
102312
112312
122211
132211
142211
152211
162211
172211
182211
192211
202211
212111
222110
232110
242110
252110
262110
272110
282110
29209
30209

How September really feels in Düzce

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.

Düzce weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°10014.410.69.40.0
Feb / -2°9614.29.110.40.4
Mar10° / 113157.611.71.9
Apr14° / 104141.813.13.8
May19° / 11314.8014.25.4
Jun22° / 12°10013.2014.96.4
Jul24° / 14°508.5014.67.6
Aug25° / 15°548.1013.67.6
Sep22° / 11°738.9012.37.1
Oct18° / 9811.50.410.95.5
Nov12° / 8210.53.29.73.1
Dec / -1°10513.97.99.10.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% 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 (%)
17228
27129
37129
47129
57129
67129
77129
87129
97030
107030
116931
126931
136832
146733
156733
166535
176535
186436
196337
206337
216238
226238
236139
246139
256040
266040
276040
286040
295941
305941

Chance of precipitation in September

Any precipitation

Düzce gets around 73 mm of rain over 8.9 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
231
331
430
530
630
729
828
928
1027
1127
1226
1326
1426
1527
1627
1727
1828
1928
2029
2129
2230
2330
2431
2531
2631
2731
2831
2931
3031

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 54% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13039273
23339263
33539243
43738222
53938212
64138192
74238181
84438171
94538151
104738141
114838131
124938131
135038120
145237110
155237110
165436100
175436100
18563590
19573490
20593380
21623170
22633070
23662860
24682750
25702550
26722440
27742330
28762130
29782020
30791920

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:26 AM to 5:56 AM, and sunset from 6:24 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:266:24
212.95:276:22
312.95:286:20
412.85:296:19
512.85:306:17
612.75:326:15
712.75:336:13
812.65:346:12
912.65:356:10
1012.55:366:08
1112.55:376:06
1212.55:386:05
1312.45:396:03
1412.45:406:01
1512.35:415:59
1612.35:425:58
1712.25:435:56
1812.25:445:54
1912.15:455:52
2012.15:465:51
2112.05:475:49
2212.05:485:47
2311.95:495:45
2411.95:505:44
2511.85:515:42
2611.85:525:40
2711.85:535:38
2811.75:545:37
2911.75:555:35
3011.65:565:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.71 kWh/m².

For context, solar energy here swings from a low near 1.69 kWh/m² to a high of 6.85 kWh/m² in July across the year — September's 4.71 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.6Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.2Bright
284.1Bright
294.0Bright
304.0Bright
Planning a trip in September

Is September a good time to visit Düzce?

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

7.1
Sightseeing
3rd-best month of the year
4.9
Beach & pool
3rd-best month of the year

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

What to pack for Düzce in September

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

In September, Düzce sees daytime highs around 22°C and nights near 11°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Düzce 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 32 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 12 — about 4.1 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb7Bracing
Mar8Bracing
Apr11Bracing
May16Cool
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep23Refreshing
Oct20Cool
Nov15Cool
Dec12Bracing

UV index in Düzce 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 Düzce peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateLowAug 10UV 9Dec 18UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Düzce 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 Düzce is worst in May — around 61 µg/m³ PM2.5 (unhealthy), about 1.7× the cleanest month (December, 35 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Düzce's WHO annual average of 44.6 µg/m³.

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorMay 961 µg/m³Dec 2335 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb41Poor
Mar59Unhealthy
Apr60Unhealthy
May61Unhealthy
Jun48Poor
Jul39Poor
Aug38Poor
Sep37Poor
Oct40Poor
Nov41Poor
Dec35Poor
Location & terrain

Where is Düzce?

Düzce sits at 40.8°N, 31.2°E, 153 m above sea level, in Turkey. The nearest listed city is Kaynaşlı, 15 km away.

Topography around Düzce

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

Within 3 km, the terrain around Düzce has only modest variations in elevation — a maximum elevation change of 41 m around an average of 151 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,477 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,359 m.

The land around Düzce is covered by artificial surfaces (48%) and trees (31%) within 3 km, trees (74%) within 16 km, and trees (61%) within 80 km.

3 km
41 m
16 km
1,477 m
80 km
2,359 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Kaynaşlı 15 km · Akçakoca 28 km · Hendek 35 km · Kocaali 35 km · Bolu 39 km · Karasu Mahallesi 41 km · Alaplı 42 km · Akyazı 49 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 Düzce (40.8389°, 31.1639°, elevation 153 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).