Freetown weather in September

In September, Freetown sees average daytime highs of 26°C and overnight lows near 25°C, with 480 mm of rain across 28.6 wet days and about 12 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Freetown's 10th-clearest and 6th-windiest month. For the whole year in context, see Freetown's year-round climate.

Daytime high: 26°; 10th warmest
Overnight low: 25°; 2nd coldest
Rainfall: 480 mm; 28.6 wet days
Daylight: 12 hours; 6:46 AM – 6:49 PM
Cloud cover: 82%; 10th clearest
Wind: 14 km/h; 6th windiest
Solar energy: 4.43 kWh/m²
Travel score: 3.6; out of 10

Freetown is capital of Sierra Leone.

Founded: 1792

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

← August Freetown year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical September day in Freetown reaches about 26°C in the afternoon and slips back to 25°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 27°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	27	27	27	27	27	27	27	27
Avg low (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25

	Avg high (°C)	Avg low (°C)
1	26	25
2	26	25
3	26	25
4	26	25
5	26	25
6	26	25
7	26	25
8	26	25
9	26	25
10	26	25
11	26	25
12	26	25
13	26	25
14	26	25
15	26	25
16	26	25
17	26	25
18	26	25
19	26	25
20	26	25
21	26	25
22	26	25
23	27	25
24	27	25
25	27	25
26	27	25
27	27	25
28	27	25
29	27	25
30	27	25

Freetown weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	27° / 26°	10	2.3	11.6	8.1
Feb	27° / 26°	6	1.4	11.7	8.2
Mar	27° / 26°	9	2.4	11.9	8.0
Apr	27° / 26°	21	5.2	12.2	7.2
May	28° / 26°	159	21.4	12.4	4.6
Jun	27° / 25°	397	29.1	12.5	3.5
Jul	26° / 25°	683	30.2	12.4	3.5
Aug	26° / 25°	751	29.9	12.3	3.5
Sep	26° / 25°	480	28.6	12	3.6
Oct	27° / 25°	232	28.1	11.8	3.8
Nov	28° / 26°	98	20.6	11.6	4.9
Dec	28° / 26°	27	7.4	11.5	7.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 86%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	10	10	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	13	14	14	16	16	17	18	18	20	20	20	20	21
Cloudier (%)	90	90	89	89	89	89	89	89	89	89	89	89	89	89	88	88	88	87	86	86	84	84	83	82	82	80	80	80	80	79

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	11	89
11	11	89
12	11	89
13	11	89
14	11	89
15	12	88
16	12	88
17	12	88
18	13	87
19	14	86
20	14	86
21	16	84
22	16	84
23	17	83
24	18	82
25	18	82
26	20	80
27	20	80
28	20	80
29	20	80
30	21	79

Chance of precipitation in September

Any precipitation

Freetown gets around 480 mm of rain over 28.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 96% and peaks near 97% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	97	97	96	96	96	96	96	96	96	96	96	96	96	96	96	96	96	96	95	95	95	95	95	95	95	95	94	94	94	94

	Rain chance (%)
1	97
2	97
3	96
4	96
5	96
6	96
7	96
8	96
9	96
10	96
11	96
12	96
13	96
14	96
15	96
16	96
17	96
18	96
19	95
20	95
21	95
22	95
23	95
24	95
25	95
26	95
27	94
28	94
29	94
30	94

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 100% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Oppressive (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	17	17	17	17	16	16	16	16	16	15	15	15	15	15	14	14	14	14	14	14	13	13	13	13	13	13	12	12	12	12
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	calm

	Wind speed (km/h)	Feels
1	17	light breeze
2	17	light breeze
3	17	light breeze
4	17	light breeze
5	16	light breeze
6	16	light breeze
7	16	light breeze
8	16	light breeze
9	16	light breeze
10	15	light breeze
11	15	light breeze
12	15	light breeze
13	15	light breeze
14	15	light breeze
15	14	light breeze
16	14	light breeze
17	14	light breeze
18	14	light breeze
19	14	light breeze
20	14	light breeze
21	13	light breeze
22	13	light breeze
23	13	light breeze
24	13	light breeze
25	13	light breeze
26	13	light breeze
27	12	light breeze
28	12	light breeze
29	12	light breeze
30	12	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over September. Sunrise moves from 6:48 AM to 6:44 AM, and sunset from 6:58 PM to 6:40 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9
Sunrise (AM)	6:48	6:48	6:48	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:45	6:45	6:45	6:45	6:45	6:45	6:45	6:45	6:45	6:44	6:44	6:44
Sunset (PM)	6:58	6:57	6:56	6:56	6:55	6:55	6:54	6:54	6:53	6:52	6:52	6:51	6:50	6:50	6:49	6:49	6:48	6:47	6:47	6:46	6:46	6:45	6:44	6:44	6:43	6:43	6:42	6:41	6:41	6:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	6:48	6:58
2	12.2	6:48	6:57
3	12.1	6:48	6:56
4	12.1	6:47	6:56
5	12.1	6:47	6:55
6	12.1	6:47	6:55
7	12.1	6:47	6:54
8	12.1	6:47	6:54
9	12.1	6:47	6:53
10	12.1	6:47	6:52
11	12.1	6:47	6:52
12	12.1	6:46	6:51
13	12.1	6:46	6:50
14	12.1	6:46	6:50
15	12.1	6:46	6:49
16	12.0	6:46	6:49
17	12.0	6:46	6:48
18	12.0	6:46	6:47
19	12.0	6:45	6:47
20	12.0	6:45	6:46
21	12.0	6:45	6:46
22	12.0	6:45	6:45
23	12.0	6:45	6:44
24	12.0	6:45	6:44
25	12.0	6:45	6:43
26	12.0	6:45	6:43
27	12.0	6:45	6:42
28	11.9	6:44	6:41
29	11.9	6:44	6:41
30	11.9	6:44	6:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.43 kWh/m².

For context, solar energy here swings from a low near 3.94 kWh/m² to a high of 6.28 kWh/m² in March across the year — September's 4.43 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.2	4.2	4.2	4.2	4.2	4.2	4.3	4.3	4.3	4.3	4.3	4.4	4.4	4.4	4.4	4.5	4.5	4.5	4.5	4.5	4.6	4.6	4.6	4.6	4.7	4.7	4.7	4.7	4.7	4.7
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.2	Bright
2	4.2	Bright
3	4.2	Bright
4	4.2	Bright
5	4.2	Bright
6	4.2	Bright
7	4.3	Bright
8	4.3	Bright
9	4.3	Bright
10	4.3	Bright
11	4.3	Bright
12	4.4	Bright
13	4.4	Bright
14	4.4	Bright
15	4.4	Bright
16	4.5	Bright
17	4.5	Bright
18	4.5	Bright
19	4.5	Bright
20	4.5	Bright
21	4.6	Bright
22	4.6	Bright
23	4.6	Bright
24	4.6	Bright
25	4.7	Bright
26	4.7	Bright
27	4.7	Bright
28	4.7	Bright
29	4.7	Bright
30	4.7	Bright

Planning a trip in September

Hazard calendar for Freetown

In seasonPeak

In September, Freetown sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Freetown's monsoon runs June–September, when most of the year's rain falls.

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

Monsoon

Dust

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Freetown?

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

3.6

Sightseeing

9th-best month of the year

3.5

Beach & pool

10th-best month of the year

September is a weaker month for outdoor sightseeing in Freetown.

What to pack for Freetown in September

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

In September, Freetown sees daytime highs around 26°C and nights near 25°C. Pack rain gear. Worth having: light clothes. About 29 days see rain.

rain gearlight clothes

Sea temperature near Freetown in September

The nearest coast averages about 27°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 20 km away) is warmest in November at about 29°C and coldest in August near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	27	27	28	28	28	27	27	27	28	29	29
Comfort	Warm	Warm	Warm	Warm	Tropical	Tropical	Warm	Warm	Warm	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	27	Warm
Mar	27	Warm
Apr	28	Warm
May	28	Tropical
Jun	28	Tropical
Jul	27	Warm
Aug	27	Warm
Sep	27	Warm
Oct	28	Tropical
Nov	29	Tropical
Dec	29	Tropical

UV index in Freetown in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Freetown peaks around August 20 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)	9	12	12	11	12	12	11	13	12	11	9	8
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	12	Extreme
Mar	12	Extreme
Apr	11	Extreme
May	12	Extreme
Jun	12	Extreme
Jul	11	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	9	Very high
Dec	8	Very high

Air quality in Freetown in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Freetown is worst in February — around 78 µg/m³ PM2.5 (unhealthy), about 7.8× the cleanest month (September, 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)	69	78	64	43	31	20	13	11	10	16	26	54
Level	Unhealthy	Unhealthy	Unhealthy	Poor	Moderate	Moderate	Moderate	Good	Good	Moderate	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	69	Unhealthy
Feb	78	Unhealthy
Mar	64	Unhealthy
Apr	43	Poor
May	31	Moderate
Jun	20	Moderate
Jul	13	Moderate
Aug	11	Good
Sep	10	Good
Oct	16	Moderate
Nov	26	Moderate
Dec	54	Poor

Location & terrain

Where is Freetown?

Freetown sits at 8.5°N, 13.2°W, 38 m above sea level, in Sierra Leone. The nearest listed city is Goderich, 9.0 km away.

Topography around Freetown

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Freetown.

Within 3 km, the terrain around Freetown has significant variations in elevation — a maximum elevation change of 368 m around an average of 65 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 778 m; within 80 km, large variations in elevation — a maximum elevation change of 885 m.

The land around Freetown is covered by artificial surfaces (48%) and water (41%) within 3 km, water (63%) within 16 km, and water (46%) and trees (34%) within 80 km.

3 km

368 m

artificial surfaces 48%

16 km

778 m

water 63%

80 km

885 m

water 46%

treesshrubsgrasslandartificial surfacesbare terrainwaterwetlandmangroves

← August Freetown year-round climate October →Best places to visit in September

September weather nearby: Goderich 9.0 km · Waterloo 24 km · Port Loko 58 km · Lunsar 80 km · Forécariah 106 km · Mile 91 112 km · Conakry 127 km · Camayenne 127 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 Freetown (8.4871°, -13.2356°, elevation 38 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).

	Avg high (°C)	Avg low (°C)
1	26	25
2	26	25
3	26	25
4	26	25
5	26	25
6	26	25
7	26	25
8	26	25
9	26	25
10	26	25
11	26	25
12	26	25
13	26	25
14	26	25
15	26	25
16	26	25
17	26	25
18	26	25
19	26	25
20	26	25
21	26	25
22	26	25
23	27	25
24	27	25
25	27	25
26	27	25
27	27	25
28	27	25
29	27	25
30	27	25

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	11	89
11	11	89
12	11	89
13	11	89
14	11	89
15	12	88
16	12	88
17	12	88
18	13	87
19	14	86
20	14	86
21	16	84
22	16	84
23	17	83
24	18	82
25	18	82
26	20	80
27	20	80
28	20	80
29	20	80
30	21	79

	Rain chance (%)
1	97
2	97
3	96
4	96
5	96
6	96
7	96
8	96
9	96
10	96
11	96
12	96
13	96
14	96
15	96
16	96
17	96
18	96
19	95
20	95
21	95
22	95
23	95
24	95
25	95
26	95
27	94
28	94
29	94
30	94

	Oppressive (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	26	25
2	26	25
3	26	25
4	26	25
5	26	25
6	26	25
7	26	25
8	26	25
9	26	25
10	26	25
11	26	25
12	26	25
13	26	25
14	26	25
15	26	25
16	26	25
17	26	25
18	26	25
19	26	25
20	26	25
21	26	25
22	26	25
23	27	25
24	27	25
25	27	25
26	27	25
27	27	25
28	27	25
29	27	25
30	27	25

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	11	89
11	11	89
12	11	89
13	11	89
14	11	89
15	12	88
16	12	88
17	12	88
18	13	87
19	14	86
20	14	86
21	16	84
22	16	84
23	17	83
24	18	82
25	18	82
26	20	80
27	20	80
28	20	80
29	20	80
30	21	79

	Rain chance (%)
1	97
2	97
3	96
4	96
5	96
6	96
7	96
8	96
9	96
10	96
11	96
12	96
13	96
14	96
15	96
16	96
17	96
18	96
19	95
20	95
21	95
22	95
23	95
24	95
25	95
26	95
27	94
28	94
29	94
30	94

	Oppressive (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	26	25
2	26	25
3	26	25
4	26	25
5	26	25
6	26	25
7	26	25
8	26	25
9	26	25
10	26	25
11	26	25
12	26	25
13	26	25
14	26	25
15	26	25
16	26	25
17	26	25
18	26	25
19	26	25
20	26	25
21	26	25
22	26	25
23	27	25
24	27	25
25	27	25
26	27	25
27	27	25
28	27	25
29	27	25
30	27	25

	Clearer (%)	Cloudier (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	11	89
11	11	89
12	11	89
13	11	89
14	11	89
15	12	88
16	12	88
17	12	88
18	13	87
19	14	86
20	14	86
21	16	84
22	16	84
23	17	83
24	18	82
25	18	82
26	20	80
27	20	80
28	20	80
29	20	80
30	21	79

	Rain chance (%)
1	97
2	97
3	96
4	96
5	96
6	96
7	96
8	96
9	96
10	96
11	96
12	96
13	96
14	96
15	96
16	96
17	96
18	96
19	95
20	95
21	95
22	95
23	95
24	95
25	95
26	95
27	94
28	94
29	94
30	94

	Oppressive (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100