Bolu weather in May
In May, Bolu sees average daytime highs of 18°C and overnight lows near 8°C, with 110 mm of precipitation across 15.9 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.
Highs climb over the month, from about 16°C in the first days to 19°C by the end. The sky is clear or mostly clear about 34% of the time in May, and the air most often feels dry.
Daylight stretches from about 13 h 42 min at the start of May to 14 h 42 min by month's end. Set against the rest of the year, May is Bolu's 7th-clearest and 9th-windiest month. For the whole year in context, see Bolu's year-round climate.
- Daytime high
- 18°
- 5th warmest
- Overnight low
- 8°
- 8th coldest
- Precipitation
- 110 mm
- 15.9 wet days
- Daylight
- 14 h 18 min
- 4:42 AM – 6:58 PM
- Cloud cover
- 57%
- 7th clearest
- Wind
- 5 km/h
- 9th windiest
- Solar energy
- 6.06 kWh/m²
- Travel score
- 5.2
- 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 May
Highs climb over the month, from about 16°C in the first days to 19°C by the end.
A typical May day in Bolu reaches about 18°C in the afternoon and slips back to 8°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 23°C. Set against its neighbours, May runs about 4°C warmer than April and about 4°C cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 |
| Avg low (°C) | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 16 | 6 |
| 2 | 16 | 6 |
| 3 | 16 | 6 |
| 4 | 16 | 6 |
| 5 | 17 | 6 |
| 6 | 17 | 6 |
| 7 | 17 | 7 |
| 8 | 17 | 7 |
| 9 | 17 | 7 |
| 10 | 17 | 7 |
| 11 | 18 | 7 |
| 12 | 18 | 7 |
| 13 | 18 | 8 |
| 14 | 18 | 8 |
| 15 | 18 | 8 |
| 16 | 18 | 8 |
| 17 | 18 | 8 |
| 18 | 19 | 8 |
| 19 | 19 | 8 |
| 20 | 19 | 8 |
| 21 | 19 | 9 |
| 22 | 19 | 9 |
| 23 | 19 | 9 |
| 24 | 19 | 9 |
| 25 | 19 | 9 |
| 26 | 19 | 9 |
| 27 | 19 | 9 |
| 28 | 19 | 9 |
| 29 | 19 | 9 |
| 30 | 20 | 10 |
| 31 | 20 | 10 |
How May really feels in Bolu
Once humidity and wind are folded in, May 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.
May 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 May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 4° / -4° | 91 | 13.9 | 11 | 9.4 | 0.0 |
| Feb | 5° / -3° | 88 | 13.8 | 10 | 10.4 | 0.2 |
| Mar | 9° / -0° | 107 | 14.9 | 8.5 | 11.7 | 1.6 |
| Apr | 14° / 4° | 99 | 14.4 | 2.5 | 13.1 | 3.5 |
| May | 18° / 8° | 110 | 15.9 | 0.1 | 14.2 | 5.2 |
| Jun | 22° / 11° | 96 | 13.3 | 0 | 14.9 | 6.3 |
| Jul | 24° / 14° | 50 | 8.6 | 0 | 14.6 | 7.6 |
| Aug | 25° / 14° | 52 | 8.3 | 0 | 13.6 | 7.7 |
| Sep | 22° / 11° | 66 | 8.8 | 0 | 12.3 | 7.1 |
| Oct | 17° / 7° | 90 | 11.2 | 0.8 | 10.9 | 5.4 |
| Nov | 11° / 2° | 75 | 10.3 | 3.6 | 9.7 | 2.8 |
| Dec | 6° / -2° | 96 | 13.4 | 8.2 | 9.1 | 0.4 |
Cloud cover in May
The sky is clear or mostly clear about 34% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 49%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 47 | 47 | 48 | 49 | 49 | 50 | 50 | 50 | 50 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 53 | 53 | 54 |
| Cloudier (%) | 53 | 53 | 52 | 51 | 51 | 50 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 47 | 47 | 46 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 47 | 53 |
| 2 | 47 | 53 |
| 3 | 48 | 52 |
| 4 | 49 | 51 |
| 5 | 49 | 51 |
| 6 | 50 | 50 |
| 7 | 50 | 50 |
| 8 | 50 | 50 |
| 9 | 50 | 50 |
| 10 | 51 | 49 |
| 11 | 51 | 49 |
| 12 | 51 | 49 |
| 13 | 52 | 48 |
| 14 | 52 | 48 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 52 | 48 |
| 19 | 52 | 48 |
| 20 | 51 | 49 |
| 21 | 51 | 49 |
| 22 | 51 | 49 |
| 23 | 51 | 49 |
| 24 | 51 | 49 |
| 25 | 51 | 49 |
| 26 | 51 | 49 |
| 27 | 52 | 48 |
| 28 | 52 | 48 |
| 29 | 53 | 47 |
| 30 | 53 | 47 |
| 31 | 54 | 46 |
Chance of precipitation in May
Bolu gets around 110 mm of rain and snow over 15.9 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 50% and peaks near 54% on the wettest days, and about 0 day brings snow. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 45 | 46 | 46 | 47 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 50 | 50 | 50 | 51 | 51 | 51 | 52 | 52 | 53 | 53 | 53 | 54 | 54 | 54 | 54 | 54 | 54 |
| Snow chance (%) | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 45 | 2 |
| 2 | 46 | 2 |
| 3 | 46 | 1 |
| 4 | 47 | 1 |
| 5 | 48 | 1 |
| 6 | 48 | 1 |
| 7 | 48 | 1 |
| 8 | 49 | 1 |
| 9 | 49 | 1 |
| 10 | 49 | 1 |
| 11 | 49 | 1 |
| 12 | 50 | 0 |
| 13 | 50 | 0 |
| 14 | 50 | 0 |
| 15 | 50 | 0 |
| 16 | 50 | 0 |
| 17 | 50 | 0 |
| 18 | 51 | 0 |
| 19 | 51 | 0 |
| 20 | 51 | 0 |
| 21 | 52 | 0 |
| 22 | 52 | 0 |
| 23 | 53 | 0 |
| 24 | 53 | 0 |
| 25 | 53 | 0 |
| 26 | 54 | 0 |
| 27 | 54 | 0 |
| 28 | 54 | 0 |
| 29 | 54 | 0 |
| 30 | 54 | 0 |
| 31 | 54 | 0 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 92% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 99 | 99 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 97 | 97 | 96 | 96 | 95 | 95 | 94 | 93 | 93 | 92 | 91 | 90 | 89 | 88 | 86 | 85 | 84 | 82 | 81 | 78 | 77 | 75 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 8 | 9 | 10 | 11 | 12 | 14 | 15 | 16 | 18 | 19 | 21 | 22 | 24 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 99 | 1 | 0 |
| 2 | 99 | 1 | 0 |
| 3 | 99 | 1 | 0 |
| 4 | 99 | 1 | 0 |
| 5 | 99 | 1 | 0 |
| 6 | 99 | 1 | 0 |
| 7 | 98 | 2 | 0 |
| 8 | 98 | 2 | 0 |
| 9 | 98 | 2 | 0 |
| 10 | 97 | 3 | 0 |
| 11 | 97 | 3 | 0 |
| 12 | 96 | 4 | 0 |
| 13 | 96 | 4 | 0 |
| 14 | 95 | 5 | 0 |
| 15 | 95 | 5 | 0 |
| 16 | 94 | 6 | 0 |
| 17 | 93 | 7 | 0 |
| 18 | 93 | 7 | 0 |
| 19 | 92 | 8 | 0 |
| 20 | 91 | 9 | 0 |
| 21 | 90 | 10 | 0 |
| 22 | 89 | 11 | 0 |
| 23 | 88 | 12 | 0 |
| 24 | 86 | 14 | 0 |
| 25 | 85 | 15 | 0 |
| 26 | 84 | 16 | 0 |
| 27 | 82 | 18 | 0 |
| 28 | 81 | 19 | 0 |
| 29 | 78 | 21 | 1 |
| 30 | 77 | 22 | 1 |
| 31 | 75 | 24 | 1 |
Wind in May
Winds average 5 km/h in May.
Across May, 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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in May
Daylight runs from about 13 h 42 min at the start of May to 14 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 60 minutes over May. Sunrise moves from 4:59 AM to 4:31 AM, and sunset from 6:42 PM to 7:11 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.7 | 13.8 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.4 | 14.4 | 14.4 | 14.4 | 14.5 | 14.5 | 14.5 | 14.6 | 14.6 | 14.6 | 14.6 | 14.7 | 14.7 |
| Sunrise (AM) | 4:59 | 4:58 | 4:57 | 4:55 | 4:54 | 4:53 | 4:52 | 4:51 | 4:49 | 4:48 | 4:47 | 4:46 | 4:45 | 4:44 | 4:43 | 4:42 | 4:41 | 4:40 | 4:39 | 4:38 | 4:37 | 4:37 | 4:36 | 4:35 | 4:34 | 4:34 | 4:33 | 4:32 | 4:32 | 4:31 | 4:31 |
| Sunset (PM) | 6:42 | 6:43 | 6:44 | 6:45 | 6:46 | 6:48 | 6:49 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 | 6:55 | 6:56 | 6:57 | 6:58 | 6:59 | 7:00 | 7:01 | 7:02 | 7:03 | 7:03 | 7:04 | 7:05 | 7:06 | 7:07 | 7:08 | 7:09 | 7:10 | 7:10 | 7:11 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.7 | 4:59 | 6:42 |
| 2 | 13.8 | 4:58 | 6:43 |
| 3 | 13.8 | 4:57 | 6:44 |
| 4 | 13.8 | 4:55 | 6:45 |
| 5 | 13.9 | 4:54 | 6:46 |
| 6 | 13.9 | 4:53 | 6:48 |
| 7 | 13.9 | 4:52 | 6:49 |
| 8 | 14.0 | 4:51 | 6:50 |
| 9 | 14.0 | 4:49 | 6:51 |
| 10 | 14.1 | 4:48 | 6:52 |
| 11 | 14.1 | 4:47 | 6:53 |
| 12 | 14.1 | 4:46 | 6:54 |
| 13 | 14.2 | 4:45 | 6:55 |
| 14 | 14.2 | 4:44 | 6:56 |
| 15 | 14.2 | 4:43 | 6:57 |
| 16 | 14.3 | 4:42 | 6:58 |
| 17 | 14.3 | 4:41 | 6:59 |
| 18 | 14.3 | 4:40 | 7:00 |
| 19 | 14.4 | 4:39 | 7:01 |
| 20 | 14.4 | 4:38 | 7:02 |
| 21 | 14.4 | 4:37 | 7:03 |
| 22 | 14.4 | 4:37 | 7:03 |
| 23 | 14.5 | 4:36 | 7:04 |
| 24 | 14.5 | 4:35 | 7:05 |
| 25 | 14.5 | 4:34 | 7:06 |
| 26 | 14.6 | 4:34 | 7:07 |
| 27 | 14.6 | 4:33 | 7:08 |
| 28 | 14.6 | 4:32 | 7:09 |
| 29 | 14.6 | 4:32 | 7:10 |
| 30 | 14.7 | 4:31 | 7:10 |
| 31 | 14.7 | 4:31 | 7:11 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 6.06 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 — May's 6.06 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.7 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 6.0 | 6.0 | 6.0 | 6.0 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.3 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.7 | Bright |
| 2 | 5.8 | Bright |
| 3 | 5.8 | Bright |
| 4 | 5.8 | Bright |
| 5 | 5.8 | Bright |
| 6 | 5.9 | Bright |
| 7 | 5.9 | Bright |
| 8 | 5.9 | Bright |
| 9 | 5.9 | Bright |
| 10 | 6.0 | Bright |
| 11 | 6.0 | Intense |
| 12 | 6.0 | Intense |
| 13 | 6.0 | Intense |
| 14 | 6.1 | Intense |
| 15 | 6.1 | Intense |
| 16 | 6.1 | Intense |
| 17 | 6.1 | Intense |
| 18 | 6.1 | Intense |
| 19 | 6.2 | Intense |
| 20 | 6.2 | Intense |
| 21 | 6.2 | Intense |
| 22 | 6.2 | Intense |
| 23 | 6.2 | Intense |
| 24 | 6.2 | Intense |
| 25 | 6.2 | Intense |
| 26 | 6.2 | Intense |
| 27 | 6.2 | Intense |
| 28 | 6.3 | Intense |
| 29 | 6.3 | Intense |
| 30 | 6.3 | Intense |
| 31 | 6.3 | Intense |
Is May a good time to visit Bolu?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Bolu for sightseeing.
What to pack for Bolu in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Bolu sees daytime highs around 18°C and nights near 8°C. Pack rain gear and sun protection. Worth having: a warm layer. About 16 days see rain.
Sea temperature near Bolu in May
The nearest coast averages about 16°C in May — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 9 | 7 | 8 | 11 | 16 | 21 | 24 | 25 | 23 | 20 | 15 | 12 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Warm | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 7 | Bracing |
| Mar | 8 | Bracing |
| Apr | 11 | Bracing |
| May | 16 | Cool |
| Jun | 21 | Refreshing |
| Jul | 24 | Refreshing |
| Aug | 25 | Warm |
| Sep | 23 | Refreshing |
| Oct | 20 | Cool |
| Nov | 15 | Cool |
| Dec | 12 | Bracing |
UV index in Bolu in May
Clear-sky midday UV in May 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 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 2 | 3 | 7 | 7 | 9 | 9 | 9 | 6 | 4 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 2 | Moderate |
| Mar | 3 | Moderate |
| Apr | 7 | High |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Bolu in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 20 | 23 | 32 | 33 | 33 | 26 | 21 | 21 | 20 | 22 | 22 | 19 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 23 | Moderate |
| Mar | 32 | Moderate |
| Apr | 33 | Moderate |
| May | 33 | Moderate |
| Jun | 26 | Moderate |
| Jul | 21 | Moderate |
| Aug | 21 | Moderate |
| Sep | 20 | Moderate |
| Oct | 22 | Moderate |
| Nov | 22 | Moderate |
| Dec | 19 | Moderate |
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.
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
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).