AI-generatedBolu at a glance
- Best time
- May – Oct
- Warmest month
- Aug · 29°
- Sunshine a year
- 1,790 h
- Rain a year
- 1,107 mm
- Climate
- Temperate
- Time zone
- UTC+3
- Elevation
- 733 m
Climate in Bolu
Bolu has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 29 °C, while January is the coolest at 6 °C. With around 1,790 hours of sunshine a year, Bolu is moderately sunny; July is the sunniest month with 8.4 hours a day.
Holiday weather through the year
Best time to visit Bolu
The best time to visit Bolu is from May to October. For sightseeing, day trips and hiking, conditions are most comfortable from September to October. Rain is frequent from December to April; the wettest month is March with 117 mm.
Bolu through the seasons
How the weather changes over the seasons, with averages for each.
Bolu in spring
Mar – May
Fair
- 12–22 °C by day
- 5.1 h of sun a day
- 45 rainy days in all
Bolu in summer
Jun – Aug
Good
- 26–29 °C by day
- 8.0 h of sun a day
- 28 rainy days in all
Bolu in autumn
Sep – Nov
Good
- 14–25 °C by day
- 4.4 h of sun a day
- 32 rainy days in all
Bolu in winter
Dec – Feb
Poor
- 6–8 °C by day
- 2.0 h of sun a day
- 43 rainy days in all
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Sep – Oct
15–28 °C and not too much rain
Rainy months
Dec – Apr
Rainy season or more than 12 rainy days
Snow
Nov – Mar
Snow on 2 or more days
Find your perfect month
Tell us what you like and we rate every month in Bolu for you.
Your best months: May – June, September
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Good
Best time to visit: May – October
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 10°
- Midday, 13:00: about 19°
- Afternoon, 16:00: about 19°
- Evening, 20:00: about 14°
- Night, 23:00: about 11°
07:0318:15
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:46–07:40 · evening 17:38–18:32
- Blue hour
- Morning 06:36–06:46 · evening 18:32–18:43
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Bolu compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 22° at the start of the month to 17° at the end. The days get 1.3 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 22° | 17° |
| Night-time low | 9° | 5° |
| Daylight | 11.8 h | 10.6 h |
What is the weather like in Bolu in October?
In October, Bolu is mild: daytime highs average 20 °C, and nights cool down to about 8 °C. Expect around 4.1 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 104 mm in total. All in all, October is a good month for a holiday in Bolu.
More details for October
- Daylight
- 11 h 12 min07:03 – 18:15
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 9 km/haverage daily peakAll months
- Cloud cover
- 57 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3offset from UTC
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %18 %
- Few rainy daysweight 30 %45 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Compare two months in Bolu
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Bolu: score 81 against 67. In July, days are 9 °C warmer than in October. July has 4 fewer rainy days. The sun shines 4 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Holiday weather score | 67 | 81better |
| Daytime high | 20° | 29° |
| Night-time low | 8° | 14° |
| Sunshine | 4.1 h | 8.4 hbetter |
| Rainy days | 12 | 8better |
| Rainfall | 104 mm | 54 mmbetter |
| Muggy days | 0better | 4 |
Based on the climate averages 1996–2025.
Bolu month by month
The typical weather for every month at a glance.
7January6° · 1.7 h
In January, Bolu is cold: daytime highs average 6 °C, and nights often drop below freezing (−2 °C). The sun is scarce, with only about 1.7 hours a day. It rains often – on about 15 days, adding up to 105 mm. Snow falls on about 9 days. All in all, January is not an ideal month for a holiday in Bolu.
Bolu in January10February8° · 2.7 h
In February, Bolu is cold: daytime highs average 8 °C, and nights often drop below freezing (−1 °C). The sun is scarce, with only about 2.7 hours a day. It rains often – on about 14 days, adding up to 99 mm. Snow falls on about 8 days. All in all, February is not an ideal month for a holiday in Bolu.
Bolu in February28March12° · 3.8 h
In March, Bolu is cool: daytime highs average 12 °C, and nights cool down to about 1 °C. The sun is scarce, with only about 3.8 hours a day. It rains often – on about 16 days, adding up to 117 mm. Snow falls on about 7 days. All in all, March is not an ideal month for a holiday in Bolu.
Bolu in March62April17° · 5.2 h
In April, Bolu is mild: daytime highs average 17 °C, and nights cool down to about 5 °C. Expect around 5.2 hours of sunshine a day. It rains often – on about 14 days, adding up to 102 mm. Snow falls on about 2 days. All in all, April is a good month for a holiday in Bolu.
Bolu in April68May22° · 6.4 h
In May, Bolu is warm: daytime highs average 22 °C, and nights cool down to about 9 °C. Expect around 6.4 hours of sunshine a day. It rains often – on about 15 days, adding up to 105 mm. All in all, May is a good month for a holiday in Bolu.
Bolu in May76June26° · 7.5 h
In June, Bolu is warm: daytime highs average 26 °C, and nights cool down to about 12 °C. The sun shines for around 7.5 hours a day. Rain is frequent, with about 13 rainy days and 100 mm in total. All in all, June is a good month for a holiday in Bolu.
Bolu in June81July29° · 8.4 h
In July, Bolu is hot: daytime highs average 29 °C, and nights cool down to about 14 °C. The sun shines for around 8.4 hours a day. Rain falls on about 8 days, adding up to 54 mm. On about 9 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Bolu.
Bolu in July77August29° · 8.0 h
In August, Bolu is hot: daytime highs average 29 °C, and nights cool down to about 15 °C. The sun shines for around 8.0 hours a day. Rain falls on about 7 days, adding up to 52 mm. On about 11 days the thermometer climbs to 30 °C or more. All in all, August is a good month for a holiday in Bolu.
Bolu in August78September25° · 6.2 h
In September, Bolu is warm: daytime highs average 25 °C, and nights cool down to about 11 °C. Expect around 6.2 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 84 mm in total. All in all, September is a good month for a holiday in Bolu.
Bolu in September67October20° · 4.1 h
In October, Bolu is mild: daytime highs average 20 °C, and nights cool down to about 8 °C. Expect around 4.1 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 104 mm in total. All in all, October is a good month for a holiday in Bolu.
Bolu in October46November14° · 3.0 h
In November, Bolu is cool: daytime highs average 14 °C, and nights cool down to about 3 °C. The sun is scarce, with only about 3.0 hours a day. Rain is frequent, with about 10 rainy days and 80 mm in total. Snow falls on about 2 days. All in all, November is a so-so month for a holiday in Bolu.
Bolu in November9December8° · 1.6 h
In December, Bolu is cold: daytime highs average 8 °C, and nights cool down to about 0 °C. The sun is scarce, with only about 1.6 hours a day. Rain is frequent, with about 14 rainy days and 106 mm in total. Snow falls on about 6 days. All in all, December is not an ideal month for a holiday in Bolu.
Bolu in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Bolu
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 8°. A duvet at night and a jumper for the evening.
The coolest nights are in January (−2°), the warmest in August (15°). Nights are pleasant for sleeping (15 to 20 °C) in August. Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 7 | 6° | −2° | 1.7 h | 15 | 105 |
| FebruaryFeb | 10 | 8° | −1° | 2.7 h | 14 | 99 |
| MarchMar | 28 | 12° | 1° | 3.8 h | 16 | 117 |
| AprilApr | 62 | 17° | 5° | 5.2 h | 14 | 102 |
| MayMay | 68 | 22° | 9° | 6.4 h | 15 | 105 |
| JuneJun | 76 | 26° | 12° | 7.5 h | 13 | 100 |
| JulyJul | 81 | 29° | 14° | 8.4 h | 8 | 54 |
| AugustAug | 77 | 29° | 15° | 8.0 h | 7 | 52 |
| SeptemberSep | 78 | 25° | 11° | 6.2 h | 10 | 84 |
| OctoberOct | 67 | 20° | 8° | 4.1 h | 12 | 104 |
| NovemberNov | 46 | 14° | 3° | 3.0 h | 10 | 80 |
| DecemberDec | 9 | 8° | 0° | 1.6 h | 14 | 106 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
40.74° N, 31.61° E · 733 m · Europe/Istanbul
Sunshine hours in Bolu
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 4.1 of 11.2 hours of daylight in Bolu, 37 % of the daylight hours.
Sunshine hours: measured at the weather station 1 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Bolu: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Bolu has about 12 rainy days with 104 mm of rain in total.
UV index in Bolu
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 4 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 10).
Minutes until sunburn in October
- Very fair skin
- about 35 min
- Fair skin
- about 40 min
- Light brown skin
- about 55 min
- Olive skin
- about 75 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Bolu
How breezy and how cloudy Bolu is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Bolu typically peaks at 9 km/h during the day: Beaufort 2, light breeze or less.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 57 % of the sky over Bolu: variable cloud, with about 4.1 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Bolu
How often the day gets hot in Bolu (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Bolu has about 0 hot days, with an average daytime high of 20 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Bolu
When Bolu is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Bolu.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Planning a trip to Bolu
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Bolu in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Bolu has its best school-holiday weather during the summer holidays (score 78) and its weakest during the Christmas holidays (score 8).
- 52
Easter holidays
Mar – Apr
Fair
- 16 °C by day
- 4.8 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain, Snow
- 70
May half-term
May – Jun
Good
- 23 °C by day
- 6.6 h of sun a day
- 15 rainy days a month
- 78
Summer holidays
Jul – Aug
GoodBest holidays
- 29 °C by day
- 8.1 h of sun a day
- 7 rainy days a month
- 67
October half-term
Oct
Good
- 20 °C by day
- 4.1 h of sun a day
- 12 rainy days a month
Good for: Sightseeing & walks
- 8
Christmas holidays
Dec – Jan
Poor
- 7 °C by day
- 1.7 h of sun a day
- 14 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 3 h 45 min
- Distance
- 2,720 km
- Time zone
- UTC+3
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Bolu compared
Put Bolu side by side with another destination.
Bolu vs Zonguldak
In October the holiday weather in Bolu and Zonguldak is about equally good (score 67 vs 71). During the day it is about as warm in Zonguldak as in Bolu.
| in October | Bolu | Zonguldak |
|---|---|---|
| Holiday weather score | 67 | 71 |
| Daytime high | 20° | 20° |
| Sunshine | 4 h | 4 h |
| Rainy days | 12 | 10 |
| Best time | May – Oct | May – Aug |
Through the year
Turkey in October: the best places
In October, Bolu ranks 25 among the 31 nearest destinations in this country.
- Konya21°93
- 2Aksaray22°93
- 3Uşak21°90
- 4Ankara21°88
- 5Hattusa20°88
- 6Yozgat18°88
- 7Isparta21°88
- 8Nevşehir20°88
- 25BoluThis page20°67
Near Bolu
Other destinations close by.
Places with a climate like Bolu
Destinations whose weather through the year is closest to Bolu's – good alternatives.
Frequently asked questions about Bolu
When is the best time to visit Bolu?
The best time to visit Bolu is from May to October. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Bolu?
August is the warmest month, with average highs of 29 °C and nights around 15 °C. January is the coolest month at 6 °C.
When does it rain most in Bolu?
Rain is frequent from December to April; the wettest month is March with 117 mm. The driest month is August with 52 mm.
How many hours of sunshine does Bolu get?
Bolu gets around 1,790 hours of sunshine a year. The sunniest month is July with 8.4 hours a day; in December there are 1.6 hours a day.
What time zone is Bolu in?
Bolu is on UTC+3 all year.
How long is the flight from London to Bolu?
A nonstop flight from London to Bolu takes about 3 h 45 min, for a straight-line distance of about 2,720 km.
Which school holidays are best for Bolu?
Bolu has its best school-holiday weather during the summer holidays (score 78) and its weakest during the Christmas holidays (score 8). Holiday ratings (0–100): Easter holidays 52, May half-term 70, summer holidays 78, October half-term 67, Christmas holidays 8.