Kastamonu weather in September

In September, Kastamonu sees average daytime highs of 23°C and overnight lows near 10°C, with 33 mm of rain across 6.9 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 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 53% 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 Kastamonu's 3rd-clearest and 9th-windiest month. For the whole year in context, see Kastamonu's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
10°
9th coldest
Rainfall
33 mm
6.9 wet days
Daylight
12 h 18 min
5:31 AM – 5:47 PM
Cloud cover
39%
3rd clearest
Wind
6 km/h
9th windiest
Solar energy
4.54 kWh/m²
Travel score
7.6
out of 10

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

Air quality
High
PM2.5 29.2 µg/m³ · 2019
Density
85/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 25°C in the first days to 21°C by the end.

A typical September day in Kastamonu reaches about 23°C in the afternoon and slips back to 10°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 29°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12512
22512
32512
42511
52411
62411
72411
82411
92411
102411
112411
122310
132310
142310
152310
162310
172310
182310
192310
202210
212210
222210
23229
24229
25229
26219
27219
28219
29219
30219

How September really feels in Kastamonu

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.

Kastamonu 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 / -4°51119.49.40.0
Feb / -3°5210.98.810.30.2
Mar / -1°6512.27.411.71.7
Apr14° / 6413.22.413.13.9
May19° / 7213.60.114.35.7
Jun23° / 11°5811.8014.96.8
Jul26° / 13°306014.77.8
Aug27° / 14°245.7013.77.8
Sep23° / 10°336.9012.37.6
Oct18° / 518.60.610.95.9
Nov11° / 447.93.49.72.8
Dec / -2°5910.67.79.10.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% 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 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38020
47921
57921
67921
77921
87822
97822
107822
117723
127624
137525
147525
157327
167327
177129
187129
196931
206733
216733
226535
236436
246436
256337
266337
276337
286337
296337
306337

Chance of precipitation in September

Any precipitation

Kastamonu gets around 33 mm of rain over 6.9 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 23% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
122
222
323
423
523
622
722
822
922
1021
1121
1221
1321
1421
1521
1621
1721
1822
1922
2023
2123
2224
2324
2424
2525
2625
2725
2825
2925
3024

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 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
182171
283161
385150
486140
588120
689110
790100
89190
99280
109370
119370
129460
139550
149640
159640
169730
179730
189730
199820
209820
219820
229820
239910
249910
259910
269910
279910
289910
299910
3010000

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
87calm
97calm
107calm
117calm
127calm
137calm
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 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 5:15 AM to 5:46 AM, and sunset from 6:14 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:156:14
212.95:166:12
312.95:186:10
412.85:196:09
512.85:206:07
612.75:216:05
712.75:226:03
812.65:236:02
912.65:246:00
1012.65:255:58
1112.55:265:56
1212.55:275:55
1312.45:285:53
1412.45:295:51
1512.35:305:49
1612.35:315:47
1712.25:325:46
1812.25:335:44
1912.15:345:42
2012.15:355:40
2112.05:365:38
2212.05:375:37
2311.95:385:35
2411.95:395:33
2511.85:415:31
2611.85:425:30
2711.85:435:28
2811.75:445:26
2911.75:455:24
3011.65:465:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.54 kWh/m².

For context, solar energy here swings from a low near 1.61 kWh/m² to a high of 6.68 kWh/m² in July across the year — September's 4.54 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Kastamonu?

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

7.6
Sightseeing
3rd-best month of the year
5.8
Beach & pool
3rd-best month of the year

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

What to pack for Kastamonu in September

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

In September, Kastamonu sees daytime highs around 23°C and nights near 10°C. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Kastamonu 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 Kastamonu peaks around August 10 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 highModerateLowAug 10UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep7Very high
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Kastamonu 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 Kastamonu is worst in April — around 41 µg/m³ PM2.5 (poor), about 1.9× the cleanest month (December, 21 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Kastamonu's WHO annual average of 29.2 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateApr 1941 µg/m³Dec 2122 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb26Moderate
Mar40Poor
Apr41Poor
May40Poor
Jun32Moderate
Jul25Moderate
Aug25Moderate
Sep25Moderate
Oct27Moderate
Nov25Moderate
Dec21Moderate
Location & terrain

Where is Kastamonu?

Kastamonu sits at 41.4°N, 33.8°E, 786 m above sea level, in Turkey. The nearest listed city is Taşköprü, 39 km away.

SafranboluİskilipOsmancıkÇerkeş

Topography around Kastamonu

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

Within 3 km, the terrain around Kastamonu has significant variations in elevation — a maximum elevation change of 317 m around an average of 884 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 791 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,562 m.

The land around Kastamonu is covered by trees (49%) and artificial surfaces (22%) within 3 km, trees (45%), cropland (32%) and grassland (20%) within 16 km, and trees (64%) and grassland (23%) within 80 km.

3 km
317 m
16 km
791 m
80 km
2,562 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Taşköprü 39 km · Tosya 46 km · Boyabat 83 km · Çankırı 88 km · Safranbolu 91 km · İskilip 92 km · Osmancık 97 km · Çerkeş 97 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 Kastamonu (41.3781°, 33.7753°, elevation 786 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. 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).