Bolu weather in October

In October, Bolu sees average daytime highs of 17°C and overnight lows near 7°C, with 90 mm of precipitation across 11.2 wet days and about 10.9 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 14°C by the end. The sky is clear or mostly clear about 37% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 18 min by month's end. Set against the rest of the year, October is Bolu's 5th-clearest and 11th-windiest month. For the whole year in context, see Bolu's year-round climate.

Daytime high
17°
6th warmest
Overnight low
7th coldest
Precipitation
90 mm
11.2 wet days
Daylight
10 h 54 min
6:12 AM – 5:05 PM
Cloud cover
54%
5th clearest
Wind
5 km/h
11th windiest
Solar energy
3.28 kWh/m²
Travel score
5.4
out of 10

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

Air quality
Elevated
PM2.5 24.4 µg/m³ · 2019
Density
6,840/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 14°C by the end.

A typical October day in Bolu reaches about 17°C in the afternoon and slips back to 7°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 22°C. Set against its neighbours, October runs about 5°C cooler than September and about 6°C warmer than November.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1209
2209
3199
4198
5198
6198
7198
8198
9198
10188
11188
12188
13188
14187
15177
16177
17177
18177
19167
20167
21166
22166
23166
24156
25156
26155
27155
28145
29145
30144
31144

How October really feels in Bolu

Once humidity and wind are folded in, October 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

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Bolu weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°9113.9119.40.0
Feb / -3°8813.81010.40.2
Mar / -0°10714.98.511.71.6
Apr14° / 9914.42.513.13.5
May18° / 11015.90.114.25.2
Jun22° / 11°9613.3014.96.3
Jul24° / 14°508.6014.67.6
Aug25° / 14°528.3013.67.7
Sep22° / 11°668.8012.37.1
Oct17° / 9011.20.810.95.4
Nov11° / 7510.33.69.72.8
Dec / -2°9613.48.29.10.4

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26238
36139
46139
56040
65842
75842
85743
95644
105545
115446
125347
135248
145149
155050
165050
174951
184852
194852
204753
214654
224654
234753
244753
254654
264753
274753
284753
294852
304852
314852

Chance of precipitation in October

Any precipitationSnow

Bolu gets around 90 mm of rain and snow over 11.2 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 36% and peaks near 39% on the wettest days, and about 1 day brings snow. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1301
2301
3311
4311
5311
6321
7321
8331
9331
10341
11341
12351
13362
14362
15372
16372
17382
18383
19393
20393
21393
22393
23394
24394
25394
26384
27385
28375
29375
30365
31356

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1919
2928
3937
4937
5937
6946
7946
8946
9946
10946
11955
12955
13955
14955
15964
16964
17964
18973
19973
20982
21982
22982
23982
24991
25991
26991
27991
28991
291000
301000
311000

Wind in October

Winds average 5 km/h in October.

Across October, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
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
286calm
296calm
306calm
316calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over October. Sunrise moves from 5:55 AM to 6:29 AM, and sunset from 5:30 PM to 4:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:555:30
211.55:565:28
311.55:585:26
411.45:595:25
511.46:005:23
611.36:015:21
711.36:025:20
811.36:035:18
911.26:045:16
1011.26:055:15
1111.16:065:13
1211.16:075:12
1311.06:085:10
1411.06:105:09
1510.96:115:07
1610.96:125:05
1710.96:135:04
1810.86:145:02
1910.86:155:01
2010.76:165:00
2110.76:174:58
2210.66:194:57
2310.66:204:55
2410.66:214:54
2510.56:224:53
2610.56:234:51
2710.46:244:50
2810.46:264:49
2910.36:274:47
3010.36:284:46
3110.36:294:45

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.28 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 6.88 kWh/m² in July across the year — October's 3.28 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Moderate
33.9Moderate
43.9Moderate
53.8Moderate
63.8Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.5Moderate
123.5Moderate
133.4Moderate
143.4Moderate
153.3Moderate
163.3Moderate
173.2Moderate
183.2Moderate
193.1Moderate
203.1Moderate
213.0Moderate
223.0Moderate
233.0Moderate
242.9Moderate
252.9Moderate
262.9Moderate
272.8Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.7Moderate
Planning a trip in October

Is October a good time to visit Bolu?

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

5.4
Sightseeing
5th-best month of the year
1.4
Beach & pool
6th-best month of the year

October is a reasonable time to visit Bolu for sightseeing.

What to pack for Bolu in October

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

In October, Bolu sees daytime highs around 17°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Bolu in October

The nearest coast averages about 20°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 47 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 Bolu in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bolu peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 highHighModerateLowAug 10UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Bolu in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Bolu is worst in May — around 33 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 19 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Bolu's WHO annual average of 24.4 µg/m³.

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMay 933 µg/m³Dec 2319 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb23Moderate
Mar32Moderate
Apr33Moderate
May33Moderate
Jun26Moderate
Jul21Moderate
Aug21Moderate
Sep20Moderate
Oct22Moderate
Nov22Moderate
Dec19Moderate
Location & terrain

Where is Bolu?

Bolu sits at 40.7°N, 31.6°E, 733 m above sea level, in Turkey. The nearest listed city is Kaynaşlı, 24 km away.

Topography around Bolu

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

Within 3 km, the terrain around Bolu has only modest variations in elevation — a maximum elevation change of 178 m around an average of 745 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,296 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,359 m.

The land around Bolu is covered by artificial surfaces (51%) and cropland (33%) within 3 km, trees (67%) within 16 km, and trees (63%) and grassland (21%) within 80 km.

3 km
178 m
16 km
1,296 m
80 km
2,359 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Kaynaşlı 24 km · Düzce 39 km · Gerede 50 km · Alaplı 53 km · Akçakoca 56 km · Devrek 61 km · Ereğli 63 km · Nallıhan 65 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 Bolu (40.7358°, 31.6061°, elevation 733 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).