Bo, Sierra Leone experiences average highs of 31°C (88°F) and lows of 23°C (73°F) throughout the year. Rainfall is frequent, averaging about 19 rainy days per month. High humidity combined with warm temperatures produces a tropical feel year-round. Average highs have stayed broadly stable across the available records.
Bo, Sierra Leone Weather & Climate 2026
Monthly climate averages for Bo, Sierra Leone. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
3.5/10
Best: January, December
UV Index
7
High
Temperature 31°C / 23°C
Feels Like 36°C / 27°C
Rainy Days 19
Rainfall 226 mm
Sunshine 8 h
Humidity 84%
Wind Speed 10 km/h
Dew Point 24°C
Hottest Month
36°C
February
Avg Low23°C
Rain3days
Coldest Month
22°C
August
Avg High27°C
Rain29days
Driest Month
2days
January
Avg High34°C
Avg Low23°C
Windiest Month
13 km/h
February (Gusts 30)
Worst Time to Visit
Consider avoiding April, May due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:31
Daylight 12.6h
Sunset 19:06
Live conditions—
Bo on the map · live conditions
Bo, Sierra Leone
- Continent
- Africa
- Country
- Sierra Leone
- City
- Bo
- Population
- 174.4K
- Coordinates
- 7.96°, -11.74°
Seasonal Breakdown
Spring
Mar–May
Avg High 33°C
Avg Low 24°C
Rain 18 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 22°C
Rain 29 days/mo
Autumn
Sep–Nov
Avg High 29°C
Avg Low 22°C
Rain 25 days/mo
Winter
Dec–Feb
Avg High 34°C
Avg Low 23°C
Rain 4 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 34°C / 23°C . Feb: 36°C / 23°C . Mar: 35°C / 24°C . Apr: 33°C / 24°C . May: 31°C / 24°C . Jun: 29°C / 23°C . Jul: 28°C / 22°C . Aug: 27°C / 22°C . Sep: 28°C / 22°C . Oct: 29°C / 22°C . Nov: 30°C / 23°C . Dec: 32°C / 22°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 7 mm. Feb: 19 mm. Mar: 47 mm. Apr: 104 mm. May: 221 mm. Jun: 329 mm. Jul: 455 mm. Aug: 552 mm. Sep: 581 mm. Oct: 267 mm. Nov: 108 mm. Dec: 24 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 70%. Feb: 66%. Mar: 71%. Apr: 80%. May: 87%. Jun: 90%. Jul: 92%. Aug: 92%. Sep: 93%. Oct: 91%. Nov: 89%. Dec: 81%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 12 km/h . Feb: 13 km/h . Mar: 12 km/h . Apr: 11 km/h . May: 9 km/h . Jun: 9 km/h . Jul: 10 km/h . Aug: 10 km/h . Sep: 9 km/h . Oct: 8 km/h . Nov: 8 km/h . Dec: 9 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 10h. Mar: 10h. Apr: 10h. May: 8h. Jun: 8h. Jul: 6h. Aug: 6h. Sep: 6h. Oct: 8h. Nov: 9h. Dec: 10h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 8. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 7. Oct: UV 7. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 18 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Feb 2025 · 37°C | Feb · 36°C |
| Coldest month | Aug 2025 · 22°C | Aug · 22°C |
| Wettest month | Sep 2025 · 794 mm | Sep · 581 mm |
| Windiest month | Feb 2025 · 15 km/h | Feb · 13 km/h |
Month-by-Month Weather Table
January best
Fair 
February
Poor March
Poor April
Poor May
Wet June
Wet July
Wet August
Wet September
Wet October
Wet November
Wet December best
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 34°C / 23°C | 37°C / 27°C | 2days (7 mm) Excellent | 10.1h Excellent | 70% Muggy | 7 High | Fair | View Details |
| February | 36°C / 23°C | 39°C / 28°C | 3days (19 mm) Excellent | 10.3h Excellent | 66% Muggy | 7.9 Very High | Poor | View Details |
| March | 35°C / 24°C | 40°C / 29°C | 11days (47 mm) Wet | 10.2h Excellent | 71% Muggy | 8.5 Very High | Poor | View Details |
| April | 33°C / 24°C | 39°C / 29°C | 16days (104 mm) Wet | 9.7h Good | 80% Humid | 8.2 Very High | Poor | View Details |
| May | 31°C / 24°C | 37°C / 29°C | 26days (221 mm) Wet | 8.2h Good | 87% Very Muggy | 7.4 Very High | Wet | View Details |
| June | 29°C / 23°C | 35°C / 27°C | 28days (329 mm) Wet | 7.8h Good | 90% Very Muggy | 7.2 Very High | Wet | View Details |
| July | 28°C / 22°C | 33°C / 26°C | 30days (455 mm) Wet | 6.4h Fair | 92% Very Muggy | 6.6 High | Wet | View Details |
| August | 27°C / 22°C | 32°C / 26°C | 29days (552 mm) Wet | 5.6h Fair | 92% Very Muggy | 6.4 High | Wet | View Details |
| September | 28°C / 22°C | 34°C / 27°C | 29days (581 mm) Wet | 6.3h Fair | 93% Very Muggy | 7 High | Wet | View Details |
| October | 29°C / 22°C | 35°C / 27°C | 28days (267 mm) Wet | 8.1h Good | 91% Very Muggy | 7.1 Very High | Wet | View Details |
| November | 30°C / 23°C | 36°C / 27°C | 18days (108 mm) Wet | 9.1h Good | 89% Very Muggy | 6.8 High | Wet | View Details |
| December best | 32°C / 22°C | 36°C / 27°C | 6days (24 mm) Good | 10h Excellent | 81% Humid | 6.7 High | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Bo are January, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Bo, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Bo is February, with average daytime highs of 36°C (96°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Bo is August, with average overnight lows of 22°C (72°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Bo is September, averaging 581mm of precipitation across 29 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Bo runs through July, August, September, June, with the heaviest rainfall in July. Based on 10-year averages for Bo.
Bo receives approximately 102 sunshine hours per year. The sunniest month is February with around 10 hours. Based on climate data for Bo.
The least favorable months to visit Bo are April, May, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider January, December instead.
The annual average UV index in Bo is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Bo is 84%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Average wind speeds in Bo are 10 km/h (6 mph). The windiest month is February with peak winds reaching 13 km/h (8 mph) (gusts up to 30 km/h / 19 mph).
Bo averages 2 clear-sky days per month with overall cloud cover around 71%. The clearest skies occur in January.
The annual average dew point in Bo is 24°C (75°F), which feels oppressively humid. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Bo has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Bo ranges from 27°C (81°F) to 36°C (97°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
June is not the best time to visit Bo, with a climate score of 2.8/10. Consider visiting during January, December instead for better conditions.
For June in Bo, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 29°C (85°F) and 28 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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