Bo weather in January

In January, Bo sees average daytime highs of 33°C and overnight lows near 22°C, with 17 mm of rain across 3.7 wet days and about 11.6 hours of daylight. It is the 3rd-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 32°C in the first days to 34°C by the end. The sky is clear or mostly clear about 56% of the time in January, and the air most often feels muggy.

Daylight stretches from about 11 h 30 min at the start of January to 11 h 42 min by month's end. Set against the rest of the year, January is Bo's 1st-clearest and 5th-windiest month. For the whole year in context, see Bo's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
22°
1st coldest
Rainfall
17 mm
3.7 wet days
Daylight
11 h 36 min
7:09 AM – 6:44 PM
Cloud cover
40%
1st clearest
Wind
5 km/h
5th windiest
Solar energy
5.3 kWh/m²
Travel score
4.1
out of 10

Bo is city of Sierra Leone.

Density
655/km²
people per km²
Founded
1787

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 32°C in the first days to 34°C by the end.

A typical January day in Bo reaches about 33°C in the afternoon and slips back to 22°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, January runs about 2°C warmer than December and about 1°C cooler than February.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13222
23222
33222
43222
53222
63222
73322
83322
93322
103322
113322
123322
133322
143322
153322
163322
173322
183322
193322
203322
213322
223322
233422
243422
253422
263422
273422
283422
293422
303422
313422

How January really feels in Bo

Once humidity and wind are folded in, January averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Bo weather by month

How January compares with the rest of the year at a glance. January is the 3rd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°173.711.64.1
Feb35° / 23°204.711.73.1
Mar34° / 24°5611.411.92.8
Apr33° / 24°12018.112.22.9
May31° / 23°2462712.42.7
Jun29° / 23°33328.912.52.8
Jul28° / 22°39629.112.43.3
Aug28° / 22°47629.412.33.4
Sep28° / 22°43329.3123.0
Oct29° / 22°24529.211.82.9
Nov30° / 22°10319.311.63.9
Dec31° / 22°266.411.55.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in January, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of January, with mostly cloudy or overcast conditions the remaining 27%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17426
27426
37327
47327
57327
67327
77228
87228
97228
107228
117129
127030
137030
147030
157030
167030
177030
187030
197129
207129
217228
227228
237426
247426
257525
267525
277624
287624
297624
307624
317624

Chance of precipitation in January

Any precipitation

Bo gets around 17 mm of rain over 3.7 wet days in January, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 14% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
110
210
310
410
510
610
710
810
910
1011
1111
1212
1312
1413
1513
1614
1714
1814
1914
2014
2114
2214
2314
2414
2514
2614
2714
2813
2913
3013
3113

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the muggy band about 44% of days. Sticky, muggy-or-worse air turns up on roughly 88% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
113834540
223835520
324836500
424838480
524839470
624840450
724842440
824843430
924844430
1024745420
1124746420
1214746410
1314747410
1414747410
1513747410
1613748410
1713748410
1813748410
1912748410
2012748410
2112847410
2222847420
2322846420
2422846420
2522845430
2622845430
2722945430
2812945430
2912945421
3011945421
3111945421

Wind in January

Winds average 5 km/h in January.

Across January, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 30 min at the start of January to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over January. Sunrise moves from 7:04 AM to 7:11 AM, and sunset from 6:36 PM to 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:046:36
211.57:046:37
311.57:056:37
411.57:056:38
511.67:056:38
611.67:066:39
711.67:066:39
811.67:066:40
911.67:076:40
1011.67:076:41
1111.67:076:41
1211.67:086:42
1311.67:086:42
1411.67:086:43
1511.67:096:43
1611.67:096:44
1711.67:096:44
1811.67:096:45
1911.67:096:45
2011.67:106:46
2111.67:106:46
2211.67:106:46
2311.67:106:47
2411.67:106:47
2511.67:106:48
2611.67:106:48
2711.67:116:48
2811.67:116:49
2911.67:116:49
3011.67:116:49
3111.77:116:50

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.3 kWh/m².

For context, solar energy here swings from a low near 3.29 kWh/m² to a high of 5.6 kWh/m² in February across the year — January's 5.3 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in January

Hazard calendar for Bo

In seasonPeak

None of Bo's seasonal hazards are active in January. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Bo's monsoon runs May–October, when most of the year's rain falls.

Bo sees seasonal dust haze (February–April), heaviest in February.

Monsoon
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Bo?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.1
Sightseeing
2nd-best month of the year
7.3
Beach & pool
1st-best month of the year

January is a reasonable time to visit Bo for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bo in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Bo sees daytime highs around 33°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 4 days see rain.

light clothessun protection

UV index in Bo in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 10 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeVery highAug 22UV 13Dec 15UV 8
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar12Extreme
Apr10Very high
May12Extreme
Jun11Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov9Very high
Dec8Very high

Air quality in Bo in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January 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).

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyModerateGoodModeratePoorApr 9200 µg/m³Aug 2011 µg/m³
PM2.5 (µg/m³)Level
Jan70Unhealthy
Feb77Unhealthy
Mar194Very unhealthy
Apr202Very unhealthy
May33Moderate
Jun19Moderate
Jul13Moderate
Aug10Good
Sep11Good
Oct17Moderate
Nov25Moderate
Dec50Poor
Location & terrain

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.

BumpeNjalaKenemaMile 91SegbwemaMakeniKoiduLunsar

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.

3 km
93 m
16 km
328 m
80 km
820 m
treesshrubsgrasslandartificial surfaceswaterwetlandmangroves
January weather nearby: Bumpe 20 km · Njala 43 km · Kenema 61 km · Mile 91 77 km · Segbwema 87 km · Makeni 108 km · Koidu 113 km · Lunsar 119 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
Muslim 77%Christian 23%

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).