Bo in Spring
In spring (March, April and May), Bo sees average daytime highs around 32°C and overnight lows near 24°C, with 423 mm of rain over about 57 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 35°C in early March to 30°C by late May. The sky is clear or mostly clear about 11% of the time across spring, and the air most often feels oppressive.
Spring is Bo's weakest season of the year to visit on our travel score. For the whole year in context, see Bo's year-round climate.
- Avg daytime high
- 32°C
- 2nd-warmest season
- Avg overnight low
- 24°C
- Rainfall
- 423 mm
- 57 wet days
- Avg wind
- 5 km/h
- Travel score
- 2.8
- weakest season of the year
- Months
- Mar · Apr · May
Temperature in Bo in Spring
Over the season highs ease from about 35°C in early March to 30°C by late May.
A typical spring day in Bo reaches about 32°C and drops to 24°C overnight. The warmest of the three months is March, the coolest May.
How spring really feels in Bo
Once humidity and wind are folded in, spring brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Bo weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 22° | 17 | 3.7 | 11.6 | 4.1 |
| Feb | 35° / 23° | 20 | 4.7 | 11.7 | 3.1 |
| Mar | 34° / 24° | 56 | 11.4 | 11.9 | 2.8 |
| Apr | 33° / 24° | 120 | 18.1 | 12.2 | 2.9 |
| May | 31° / 23° | 246 | 27 | 12.4 | 2.7 |
| Jun | 29° / 23° | 333 | 28.9 | 12.5 | 2.8 |
| Jul | 28° / 22° | 396 | 29.1 | 12.4 | 3.3 |
| Aug | 28° / 22° | 476 | 29.4 | 12.3 | 3.4 |
| Sep | 28° / 22° | 433 | 29.3 | 12 | 3.0 |
| Oct | 29° / 22° | 245 | 29.2 | 11.8 | 2.9 |
| Nov | 30° / 22° | 103 | 19.3 | 11.6 | 3.9 |
| Dec | 31° / 22° | 26 | 6.4 | 11.5 | 5.0 |
Cloud cover in Spring
The sky is clear or mostly clear about 11% of the time across spring.
Chance of precipitation in Spring
Bo gets around 423 mm of rain over 57 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 5 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 48 min in early March to 12 h 24 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 4.9 kWh/m².
Hazard calendar for Bo
In spring, Bo overlaps its monsoon and dust season. The full year is below, with each hazard's peak months called out.
Bo's monsoon runs May–October, when most of the year's rain falls.
Bo sees seasonal dust haze (February–April), heaviest in February.
Is spring a good time to visit Bo?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a weaker month for outdoor sightseeing in Bo.
What to pack for Bo in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Bo sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 57 days see rain.
UV index in Bo in Spring
Clear-sky midday UV across spring averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bo peaks around August 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 8 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 10 | 11 | 12 | 10 | 12 | 11 | 11 | 13 | 13 | 12 | 9 | 8 |
| Level | Very high | Extreme | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 10 | Very high |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 9 | Very high |
| Dec | 8 | Very high |
Air quality in Bo in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Bo is worst in April — around 202 µg/m³ PM2.5 (very unhealthy), about 19.4× the cleanest month (August, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 70 | 77 | 194 | 202 | 33 | 19 | 13 | 10 | 11 | 17 | 25 | 50 |
| Level | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy | Moderate | Moderate | Moderate | Good | Good | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 70 | Unhealthy |
| Feb | 77 | Unhealthy |
| Mar | 194 | Very unhealthy |
| Apr | 202 | Very unhealthy |
| May | 33 | Moderate |
| Jun | 19 | Moderate |
| Jul | 13 | Moderate |
| Aug | 10 | Good |
| Sep | 11 | Good |
| Oct | 17 | Moderate |
| Nov | 25 | Moderate |
| Dec | 50 | Poor |
Where is Bo?
Bo sits at 8.0°N, 11.7°W, 104 m above sea level, in Sierra Leone. The nearest listed city is Bumpe, 20 km away.
Topography around Bo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bo.
Within 3 km, the terrain around Bo has only modest variations in elevation — a maximum elevation change of 93 m around an average of 93 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 328 m; within 80 km, large variations in elevation — a maximum elevation change of 820 m.
The land around Bo is covered by artificial surfaces (56%) and trees (22%) within 3 km, trees (51%) and shrubs (35%) within 16 km, and trees (63%) and shrubs (20%) within 80 km.
Sierra Leone travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G
- 230 V · 50 Hz
- Prices
- ≈ 24% of US
- price level, 2025
- GDP per capita
- $846
- 2025
- Happiness
- 3.3 / 10
- World Happiness, 2025
- Safe drinking water
- 11%
- of population, 2024
- Homicide rate
- 2.2
- per 100k, 2020
- Road deaths
- 33
- per 100k/yr, 2019
- Income group
- Low
- World Bank
- 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 Bo (7.9647°, -11.7383°, elevation 104 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.