Climate averages 1991–2020
Bo weather
by month.
See how the year changes. February has the highest average daily maximum; January has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Bo averages a daytime high of 30.4°C and a nighttime low of 22.5°C, with about 2,471 mm of rain on roughly 236 days. February is the warmest month (average high 34.3°C) and August the coolest (27.2°C). August is the wettest month with 476 mm; January is the driest with 17 mm.
The annual picture
A year in Bo
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
Bo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 33.1°C21.9°C | 21.9°C | 17 | 3.7 | 11.712 h |
| February | 34.3°C22.9°C | 22.9°C | 20 | 4.7 | 11.912 h |
| March | 33.9°C23.6°C | 23.6°C | 56 | 11.4 | 12.112 h |
| April | 32.2°C23.6°C | 23.6°C | 120 | 18.0 | 12.312 h |
| May | 30.4°C23.2°C | 23.2°C | 246 | 27.0 | 12.512 h |
| June | 29.0°C22.4°C | 22.4°C | 333 | 28.9 | 12.613 h |
| July | 27.7°C21.9°C | 21.9°C | 396 | 29.1 | 12.513 h |
| August | 27.2°C21.8°C | 21.8°C | 476 | 29.4 | 12.412 h |
| September | 28.1°C21.9°C | 21.9°C | 433 | 29.3 | 12.212 h |
| October | 28.8°C22.1°C | 22.1°C | 245 | 29.2 | 12.012 h |
| November | 29.4°C22.3°C | 22.3°C | 103 | 19.3 | 11.812 h |
| December | 30.8°C22.2°C | 22.2°C | 26 | 6.4 | 11.712 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
Nearby cities
- KenemaSierra Leone · 61 kmHigh 30.0°C · Low 22.5°C · 2,215 mm rain a year
- MakeniSierra Leone · 108 kmHigh 31.3°C · Low 23.0°C · 2,265 mm rain a year
- KoiduSierra Leone · 113 kmHigh 29.5°C · Low 21.7°C · 2,439 mm rain a year
- FreetownSierra Leone · 175 kmHigh 27.3°C · Low 25.0°C · 2,873 mm rain a year
- GueckedouGuinea · 189 kmHigh 29.6°C · Low 21.5°C · 2,143 mm rain a year
- MonroviaLiberia · 212 kmHigh 28.3°C · Low 23.6°C · 3,464 mm rain a year
- KissidougouGuinea · 226 kmHigh 30.2°C · Low 21.0°C · 1,926 mm rain a year
- FaranahGuinea · 255 kmHigh 31.7°C · Low 21.8°C · 1,525 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC±0, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 8.00°, -11.70° (6 km from the city centre), adjusted down by 0.1°C for the difference between the city's elevation (104 m) and the cell's (93 m). Rain comes from the 0.25° cell at 8.00°, -11.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.