Bumpe weather in September

In September, Bumpe sees average daytime highs of 28°C and overnight lows near 22°C, with 459 mm of rain across 29.5 wet days and about 12 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 0% 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 Bumpe's 10th-clearest and 7th-windiest month. For the whole year in context, see Bumpe's year-round climate.

Daytime high: 28°; 10th warmest
Overnight low: 22°; 7th coldest
Rainfall: 459 mm; 29.5 wet days
Daylight: 12 hours; 6:41 AM – 6:43 PM
Cloud cover: 87%; 10th clearest
Wind: 5 km/h; 7th windiest
Solar energy: 3.8 kWh/m²
Travel score: 3.0; out of 10

Bumpe is place in Southern Province, Sierra Leone.

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

← August Bumpe 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 28°C through the month.

A typical September day in Bumpe reaches about 28°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than 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)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	29	29	29	29	29	29	29	29	29	29	29	29	29	29
Avg low (°C)	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22

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

How September really feels in Bumpe

Once humidity and wind are folded in, September averages 7 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Bumpe weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	33° / 22°	19	4.3	11.6	4.4
Feb	34° / 23°	22	4.7	11.7	3.5
Mar	34° / 24°	60	11.9	11.9	3.0
Apr	32° / 24°	126	18.5	12.2	2.9
May	31° / 23°	256	27.5	12.4	2.7
Jun	29° / 23°	354	29.1	12.5	2.8
Jul	28° / 22°	429	29.4	12.4	3.2
Aug	28° / 22°	522	29.5	12.3	3.3
Sep	28° / 22°	459	29.5	12	3.0
Oct	29° / 22°	257	29.7	11.8	2.9
Nov	30° / 22°	107	20.2	11.6	3.8
Dec	31° / 22°	30	7.4	11.5	4.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 96%.

	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 (%)	1	1	2	2	2	2	2	3	3	3	3	4	4	4	4	4	5	5	5	5	5	5	6	6	6	6	6	6	7	7
Cloudier (%)	99	99	98	98	98	98	98	97	97	97	97	96	96	96	96	96	95	95	95	95	95	95	94	94	94	94	94	94	93	93

	Clearer (%)	Cloudier (%)
1	1	99
2	1	99
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	3	97
9	3	97
10	3	97
11	3	97
12	4	96
13	4	96
14	4	96
15	4	96
16	4	96
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

Chance of precipitation in September

Any precipitation

Bumpe gets around 459 mm of rain over 29.5 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 98% and peaks near 99% 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 (%)	98	98	98	98	98	98	98	98	98	98	98	98	98	98	99	99	99	99	99	99	99	99	99	99	99	99	99	98	98	98

	Rain chance (%)
1	98
2	98
3	98
4	98
5	98
6	98
7	98
8	98
9	98
10	98
11	98
12	98
13	98
14	98
15	99
16	99
17	99
18	99
19	99
20	99
21	99
22	99
23	99
24	99
25	99
26	99
27	99
28	98
29	98
30	98

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 99% 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	99	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	98	98
Miserable (%)	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2

	Oppressive (%)	Miserable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	98	2

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 6 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)	6	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	6	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	4	calm
30	4	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 6:43 AM to 6:39 AM, and sunset from 6:52 PM to 6:35 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	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9
Sunrise (AM)	6:43	6:43	6:43	6:42	6:42	6:42	6:42	6:42	6:42	6:42	6:41	6:41	6:41	6:41	6:41	6:41	6:41	6:40	6:40	6:40	6:40	6:40	6:40	6:40	6:39	6:39	6:39	6:39	6:39	6:39
Sunset (PM)	6:52	6:51	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	6:40	6:39	6:39	6:38	6:37	6:37	6:36	6:36	6:35

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	6:43	6:52
2	12.1	6:43	6:51
3	12.1	6:43	6:51
4	12.1	6:42	6:50
5	12.1	6:42	6:50
6	12.1	6:42	6:49
7	12.1	6:42	6:49
8	12.1	6:42	6:48
9	12.1	6:42	6:47
10	12.1	6:42	6:47
11	12.1	6:41	6:46
12	12.1	6:41	6:46
13	12.1	6:41	6:45
14	12.1	6:41	6:44
15	12.1	6:41	6:44
16	12.0	6:41	6:43
17	12.0	6:41	6:43
18	12.0	6:40	6:42
19	12.0	6:40	6:41
20	12.0	6:40	6:41
21	12.0	6:40	6:40
22	12.0	6:40	6:40
23	12.0	6:40	6:39
24	12.0	6:40	6:39
25	12.0	6:39	6:38
26	12.0	6:39	6:37
27	12.0	6:39	6:37
28	12.0	6:39	6:36
29	11.9	6:39	6:36
30	11.9	6:39	6:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.8 kWh/m².

For context, solar energy here swings from a low near 3.26 kWh/m² to a high of 5.58 kWh/m² in February across the year — September's 3.8 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)	3.5	3.5	3.5	3.5	3.5	3.6	3.6	3.6	3.6	3.7	3.7	3.7	3.7	3.8	3.8	3.8	3.8	3.9	3.9	3.9	3.9	4.0	4.0	4.0	4.0	4.0	4.1	4.1	4.1	4.1
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.5	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.6	Moderate
7	3.6	Moderate
8	3.6	Moderate
9	3.6	Moderate
10	3.7	Moderate
11	3.7	Moderate
12	3.7	Moderate
13	3.7	Moderate
14	3.8	Moderate
15	3.8	Moderate
16	3.8	Moderate
17	3.8	Moderate
18	3.9	Moderate
19	3.9	Moderate
20	3.9	Moderate
21	3.9	Moderate
22	4.0	Moderate
23	4.0	Moderate
24	4.0	Bright
25	4.0	Bright
26	4.0	Bright
27	4.1	Bright
28	4.1	Bright
29	4.1	Bright
30	4.1	Bright

Planning a trip in September

Hazard calendar for Bumpe

In seasonPeak

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

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

Bumpe 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 Bumpe?

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

3.0

Sightseeing

7th-best month of the year

3.6

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Bumpe.

What to pack for Bumpe in September

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

In September, Bumpe sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. About 30 days see rain.

light clothesrain gear

UV index in Bumpe in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bumpe peaks around August 21 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	12	12	10	12	11	11	13	13	12	9	8
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	10	Very high
Feb	12	Extreme
Mar	12	Extreme
Apr	10	Extreme
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 Bumpe 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 Bumpe 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

Location & terrain

Where is Bumpe?

Bumpe sits at 7.9°N, 11.9°W, 38 m above sea level, in Sierra Leone. The nearest listed city is Bo, 20 km away.

Topography around Bumpe

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

Within 3 km, the terrain around Bumpe has only modest variations in elevation — a maximum elevation change of 49 m around an average of 39 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 132 m; within 80 km, large variations in elevation — a maximum elevation change of 820 m.

The land around Bumpe is covered by trees (46%) and shrubs (36%) within 3 km, trees (41%), shrubs (38%) and grassland (21%) within 16 km, and trees (57%) and shrubs (20%) within 80 km.

3 km

49 m

trees 46%

16 km

132 m

trees 41%

80 km

820 m

trees 57%

treesshrubsgrasslandartificial surfaceswaterwetlandmangroves

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

September weather nearby: Bo 20 km · Njala 40 km · Mile 91 72 km · Kenema 79 km · Segbwema 106 km · Makeni 112 km · Lunsar 112 km · Koidu 132 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 Bumpe (7.8921°, -11.9054°, 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. 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	28	22
2	28	22
3	28	22
4	28	22
5	28	22
6	28	22
7	28	22
8	28	22
9	28	22
10	28	22
11	28	22
12	28	22
13	28	22
14	28	22
15	28	22
16	28	22
17	29	22
18	29	22
19	29	22
20	29	22
21	29	22
22	29	22
23	29	22
24	29	22
25	29	22
26	29	22
27	29	22
28	29	22
29	29	22
30	29	22

	Clearer (%)	Cloudier (%)
1	1	99
2	1	99
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	3	97
9	3	97
10	3	97
11	3	97
12	4	96
13	4	96
14	4	96
15	4	96
16	4	96
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

	Rain chance (%)
1	98
2	98
3	98
4	98
5	98
6	98
7	98
8	98
9	98
10	98
11	98
12	98
13	98
14	98
15	99
16	99
17	99
18	99
19	99
20	99
21	99
22	99
23	99
24	99
25	99
26	99
27	99
28	98
29	98
30	98

	Oppressive (%)	Miserable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	98	2

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

	Clearer (%)	Cloudier (%)
1	1	99
2	1	99
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	3	97
9	3	97
10	3	97
11	3	97
12	4	96
13	4	96
14	4	96
15	4	96
16	4	96
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

	Rain chance (%)
1	98
2	98
3	98
4	98
5	98
6	98
7	98
8	98
9	98
10	98
11	98
12	98
13	98
14	98
15	99
16	99
17	99
18	99
19	99
20	99
21	99
22	99
23	99
24	99
25	99
26	99
27	99
28	98
29	98
30	98

	Oppressive (%)	Miserable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	98	2

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

	Clearer (%)	Cloudier (%)
1	1	99
2	1	99
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	3	97
9	3	97
10	3	97
11	3	97
12	4	96
13	4	96
14	4	96
15	4	96
16	4	96
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

	Rain chance (%)
1	98
2	98
3	98
4	98
5	98
6	98
7	98
8	98
9	98
10	98
11	98
12	98
13	98
14	98
15	99
16	99
17	99
18	99
19	99
20	99
21	99
22	99
23	99
24	99
25	99
26	99
27	99
28	98
29	98
30	98

	Oppressive (%)	Miserable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	98	2