Climate averages 1991–2020
Bolu weather
in May.
A mild, wet month: the 5th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Bolu: daytime highs average 19.8°C and nights cool to about 9.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 110 mm of rain on roughly 16 days, which makes May a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 26 min on an average May day.
The nearest other city in this atlas is Düzce (39 km away). In May its highs average 21.3°C, 1.5°C warmer than Bolu, with 113 mm of rain.
Among the 138 cities listed in Turkey, Bolu ranks joint 110th of 138 for the warmest May highs and joint 130th of 138 for the driest May (rainfall, lowest first). The mean May high of those 138 cities is 22.4°C; Bolu is 2.7°C cooler than that mean.
From May to June, average highs rise by 3.0°C to 22.8°C, and monthly rainfall falls from 110 mm to 96 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bolu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C-2.9°C | -2.9°C | 91 | 13.9 | 9.610 h |
| February | 6.0°C-2.5°C | -2.5°C | 89 | 13.8 | 10.611 h |
| March | 9.9°C0.3°C | 0.3°C | 107 | 14.9 | 11.912 h |
| April | 15.3°C4.4°C | 4.4°C | 99 | 14.4 | 13.313 h |
| May, selected | 19.8°C9.2°C | 9.2°C | 110 | 15.7 | 14.414 h |
| June | 22.8°C12.9°C | 12.9°C | 96 | 13.2 | 15.015 h |
| July | 25.5°C15.0°C | 15.0°C | 50 | 8.7 | 14.815 h |
| August | 26.3°C15.7°C | 15.7°C | 52 | 8.4 | 13.814 h |
| September | 23.1°C12.4°C | 12.4°C | 66 | 8.7 | 12.513 h |
| October | 18.4°C8.5°C | 8.5°C | 90 | 10.9 | 11.211 h |
| November | 12.3°C2.8°C | 2.8°C | 75 | 10.2 | 10.010 h |
| December | 6.7°C-1.0°C | -1.0°C | 96 | 13.7 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Düzce in MayTurkey · 39 kmHigh 21.3°C · Low 11.2°C · 113 mm rain
- Ereğli (Zonguldak Province), Turkey in MayTurkey · 63 kmHigh 18.7°C · Low 13.1°C · 55 mm rain
- Zonguldak in MayTurkey · 81 kmHigh 20.0°C · Low 12.8°C · 43 mm rain
- Karabük in MayTurkey · 100 kmHigh 22.0°C · Low 11.0°C · 84 mm rain
- Adapazarı in MayTurkey · 101 kmHigh 21.6°C · Low 10.9°C · 73 mm rain
- Bartın in MayTurkey · 117 kmHigh 20.4°C · Low 11.8°C · 42 mm rain
- Polatlı in MayTurkey · 137 kmHigh 22.7°C · Low 10.0°C · 36 mm rain
- Ankara in MayTurkey · 139 kmHigh 22.5°C · Low 10.7°C · 44 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bolu) is explained once on the Bolu year overview and on the Sources, method and limits page.