Bo climate
Bo (Sierra Leone) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 26 °C80 °F, and about 1,938 mm76 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Bo climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3290 | 2067 | 2679 | 10.0 |
| Feb | 3493 | 2271 | 2882 | 60.2 |
| Mar | 3595 | 2374 | 2984 | 150.6 |
| Apr | 3494 | 2475 | 2985 | 391.5 |
| May | 3290 | 2475 | 2882 | 1184.7 |
| Jun | 3085 | 2373 | 2679 | 32013 |
| Jul | 2882 | 2271 | 2577 | 40616 |
| Aug | 2781 | 2171 | 2476 | 44017 |
| Sep | 2882 | 2271 | 2577 | 34814 |
| Oct | 2984 | 2272 | 2678 | 1867.3 |
| Nov | 3086 | 2272 | 2679 | 522.1 |
| Dec | 3188 | 2169 | 2678 | 80.3 |
| Year | 3595 | 2067 | 2680 | 1,93876 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 68% | 40% | 5.0 | 11:42 |
| Feb | 67% | 46% | 5.2 | 11:52 |
| Mar | 65% | 55% | 5.3 | 12:04 |
| Apr | 67% | 65% | 5.2 | 12:17 |
| May | 76% | 77% | 4.8 | 12:29 |
| Jun | 85% | 82% | 4.2 | 12:35 |
| Jul | 89% | 87% | 3.8 | 12:33 |
| Aug | 90% | 90% | 3.7 | 12:23 |
| Sep | 90% | 88% | 4.2 | 12:09 |
| Oct | 89% | 78% | 4.8 | 11:56 |
| Nov | 84% | 68% | 4.6 | 11:45 |
| Dec | 75% | 48% | 4.6 | 11:40 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Bo is like
The warmest month is April, with an average high of 34 °C94 °F and a low of 24 °C75 °F. The coldest is August, when highs average 27 °C81 °F and lows 21 °C71 °F. Seasonal differences are small — just 4.7 °C8.5 °F between the warmest and the coolest month.
It is wet, with about 1,938 mm76 in of precipitation per year. The wettest three-month stretch is July–September, which brings 62% of the annual total. Months with less than 20 mm0.8 in on average: December–March. The wettest month is August (440 mm17 in), the driest is January (1 mm0.0 in).
Relative humidity ranges from 65% in March to 90% in August. The clearest skies (lowest average cloud amount, 40%) are typical of January. Average wind speed near the ground ranges from 4 km/h (2 mph) in November to 7 km/h (4 mph) in August.
Best time to visit Bo
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November and December: average highs of 30 °C86 °F to 31 °C88 °F with 8 mm0.3 in to 52 mm2.1 in of precipitation per month.
The most challenging month is August, which is very wet (440 mm17 in) and humid (90% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Bo
- Wetter months (June–October) — highs 2781 to 30 °C85 °F, lows 2171 to 23 °C73 °F, about 340 mm13 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (November–May) — highs 3086 to 35 °C95 °F, lows 2067 to 24 °C75 °F, about 34 mm1.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Bo compares
Compared with Kenema, about 61 km to the east, Bo has practically the same average temperature and receives a similar amount of precipitation.
Of the 4 places in Sierra Leone covered by World Climates, Bo is the warmest by annual mean temperature and the 3rd wettest by annual precipitation. See all of them on the Sierra Leone climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Palmas (Brazil, Aw), Udupi (India, Am) and Mangaluru (India, Am).
Nearby places
- Kenema 61 km · 26 °C79 °F · 1,933 mm76 in
- Koidu 113 km · 26 °C78 °F · 2,024 mm80 in
- Freetown 175 km · 26 °C79 °F · 2,570 mm101 in
- Monrovia 212 km · 27 °C80 °F · 1,718 mm68 in
- Kissidougou 226 km · 25 °C76 °F · 1,744 mm69 in
- Kindia 264 km · 25 °C78 °F · 2,847 mm112 in
- Manéah 270 km · 27 °C81 °F · 2,941 mm116 in
- Conakry 276 km · 27 °C81 °F · 2,897 mm114 in
Frequently asked questions
What is the warmest month in Bo?
April is the warmest month in Bo, with an average high of 34 °C (94 °F) and an average low of 24 °C (75 °F).
What is the coldest month in Bo?
August is the coldest month, with an average high of 27 °C (81 °F) and an average low of 21 °C (71 °F).
When does it rain the most in Bo?
August is the wettest month with about 440 mm (17.3 in) of precipitation; January is the driest with about 1 mm (0.0 in).
What is the best time to visit Bo?
Judging by long-term averages, the most comfortable months are November and December.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.