Isiro weather in September

In September, Isiro sees average daytime highs of 27°C and overnight lows near 20°C, with 190 mm of rain across 26.5 wet days and about 12 hours of daylight. It is the 8th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Isiro's 10th-clearest and 8th-windiest month. For the whole year in context, see Isiro's year-round climate.

Daytime high: 27°; 8th warmest
Overnight low: 20°; 3rd coldest
Rainfall: 190 mm; 26.5 wet days
Daylight: 12 hours; 6:03 AM – 6:04 PM
Cloud cover: 80%; 10th clearest
Wind: 4 km/h; 8th windiest
Solar energy: 4.99 kWh/m²
Travel score: 3.8; out of 10

Isiro is city in the Democratic Republic of Congo, capital of the Haut-Uele province.

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

← August Isiro 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 27°C through the month.

A typical September day in Isiro reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°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)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27
Avg low (°C)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20

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

How September really feels in Isiro

Once humidity and wind are folded in, September averages 0 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Isiro weather by month

How September compares with the rest of the year at a glance. September is the 8th-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	31° / 20°	37	6.6	11.9	4.7
Feb	32° / 20°	60	9.7	11.9	4.0
Mar	30° / 21°	146	20.3	12	3.7
Apr	28° / 21°	188	23.9	12.1	3.8
May	28° / 21°	152	24.4	12.1	4.1
Jun	27° / 20°	134	24	12.2	4.1
Jul	27° / 20°	149	25.2	12.1	4.2
Aug	27° / 20°	178	26.3	12.1	4.0
Sep	27° / 20°	190	26.5	12	3.8
Oct	27° / 20°	229	28.3	11.9	3.6
Nov	27° / 20°	201	24	11.9	4.1
Dec	29° / 20°	58	10.1	11.8	5.3

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 12% 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 (%)	15	15	15	15	15	15	15	15	15	16	16	15	15	15	15	15	15	15	14	14	14	14	12	12	12	12	12	12	12	11
Cloudier (%)	85	85	85	85	85	85	85	85	85	84	84	85	85	85	85	85	85	85	86	86	86	86	88	88	88	88	88	88	88	89

	Clearer (%)	Cloudier (%)
1	15	85
2	15	85
3	15	85
4	15	85
5	15	85
6	15	85
7	15	85
8	15	85
9	15	85
10	16	84
11	16	84
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	15	85
18	15	85
19	14	86
20	14	86
21	14	86
22	14	86
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	12	88
29	12	88
30	11	89

Chance of precipitation in September

Any precipitation

Isiro gets around 190 mm of rain over 26.5 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 89% and peaks near 90% 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 (%)	86	87	87	88	88	88	88	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	89	90	90

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 80% 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
Muggy (%)	87	87	87	86	86	85	85	84	84	83	82	82	81	80	80	79	78	77	77	76	76	76	76	76	76	76	76	76	75	75
Oppressive (%)	13	13	13	14	14	15	15	16	16	17	18	18	19	20	20	21	22	23	23	24	24	24	24	24	24	24	24	24	25	25

	Muggy (%)	Oppressive (%)
1	87	13
2	87	13
3	87	13
4	86	14
5	86	14
6	85	15
7	85	15
8	84	16
9	84	16
10	83	17
11	82	18
12	82	18
13	81	19
14	80	20
15	80	20
16	79	21
17	78	22
18	77	23
19	77	23
20	76	24
21	76	24
22	76	24
23	76	24
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	75	25
30	75	25

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 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)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:08 AM to 5:59 AM, and sunset from 6:11 PM to 5:58 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)	12.1	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	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	12.0	12.0
Sunrise (AM)	6:08	6:07	6:07	6:07	6:07	6:06	6:06	6:06	6:05	6:05	6:05	6:05	6:04	6:04	6:04	6:03	6:03	6:03	6:03	6:02	6:02	6:02	6:01	6:01	6:01	6:01	6:00	6:00	6:00	5:59
Sunset (PM)	6:11	6:10	6:10	6:10	6:09	6:09	6:08	6:08	6:07	6:07	6:07	6:06	6:06	6:05	6:05	6:04	6:04	6:03	6:03	6:03	6:02	6:02	6:01	6:01	6:00	6:00	5:59	5:59	5:59	5:58

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.1	6:08	6:11
2	12.1	6:07	6:10
3	12.0	6:07	6:10
4	12.0	6:07	6:10
5	12.0	6:07	6:09
6	12.0	6:06	6:09
7	12.0	6:06	6:08
8	12.0	6:06	6:08
9	12.0	6:05	6:07
10	12.0	6:05	6:07
11	12.0	6:05	6:07
12	12.0	6:05	6:06
13	12.0	6:04	6:06
14	12.0	6:04	6:05
15	12.0	6:04	6:05
16	12.0	6:03	6:04
17	12.0	6:03	6:04
18	12.0	6:03	6:03
19	12.0	6:03	6:03
20	12.0	6:02	6:03
21	12.0	6:02	6:02
22	12.0	6:02	6:02
23	12.0	6:01	6:01
24	12.0	6:01	6:01
25	12.0	6:01	6:00
26	12.0	6:01	6:00
27	12.0	6:00	5:59
28	12.0	6:00	5:59
29	12.0	6:00	5:59
30	12.0	5:59	5:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.99 kWh/m².

For context, solar energy here swings from a low near 4.62 kWh/m² to a high of 5.75 kWh/m² in February across the year — September's 4.99 kWh/m² falls in the middle.

	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)	4.9	4.9	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	4.9	4.9	4.9
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	4.9	Bright
2	4.9	Bright
3	5.0	Bright
4	5.0	Bright
5	5.0	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	5.0	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	5.0	Bright
24	5.0	Bright
25	5.0	Bright
26	5.0	Bright
27	5.0	Bright
28	4.9	Bright
29	4.9	Bright
30	4.9	Bright

Planning a trip in September

Is September a good time to visit Isiro?

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

3.8

Sightseeing

9th-best month of the year

3.9

Beach & pool

11th-best month of the year

September is a weaker month for outdoor sightseeing in Isiro.

What to pack for Isiro in September

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

In September, Isiro sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in Isiro 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 Isiro peaks around March 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 9 (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	14	13	11	10	9	12	12	13	10	10
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Very high

	UV index (midday)	Level
Jan	10	Extreme
Feb	11	Extreme
Mar	14	Extreme
Apr	13	Extreme
May	11	Extreme
Jun	10	Very high
Jul	9	Very high
Aug	12	Extreme
Sep	12	Extreme
Oct	13	Extreme
Nov	10	Extreme
Dec	10	Very high

Air quality in Isiro 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 Isiro is worst in February — around 130 µg/m³ PM2.5 (unhealthy), about 14.4× the cleanest month (October, 9 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)	61	130	49	18	10	15	16	12	9	9	15	36
Level	Unhealthy	Unhealthy	Poor	Moderate	Good	Moderate	Moderate	Moderate	Good	Good	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	61	Unhealthy
Feb	130	Unhealthy
Mar	49	Poor
Apr	18	Moderate
May	10	Good
Jun	15	Moderate
Jul	16	Moderate
Aug	12	Moderate
Sep	9	Good
Oct	9	Good
Nov	15	Moderate
Dec	36	Poor

Location & terrain

Where is Isiro?

Isiro sits at 2.8°N, 27.6°E, 761 m above sea level, in Democratic Republic of the Congo. The nearest listed city is Wamba, 81 km away.

Topography around Isiro

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

Within 3 km, the terrain around Isiro has only modest variations in elevation — a maximum elevation change of 60 m around an average of 748 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 286 m; within 80 km, significant variations in elevation — a maximum elevation change of 469 m.

The land around Isiro is covered by artificial surfaces (36%), grassland (32%) and trees (31%) within 3 km, trees (86%) within 16 km, and trees (91%) within 80 km.

3 km

60 m

artificial surfaces 36%

16 km

286 m

trees 86%

80 km

469 m

trees 91%

treesgrasslandartificial surfaces

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

September weather nearby: Wamba 81 km · Bakwa 152 km · Watsa 215 km · Yambio 218 km · Mangbwalu 285 km · Babamba 288 km · Mangina 306 km · Hyosha 313 km

Democratic Republic of the Congo travel facts

Travel advisory: Level 4; Do Not Travel
Power plugs: Type C / E; 220 V · 50 Hz
Prices: ≈ 42% of US; price level, 2025
GDP per capita: $807; 2025
Happiness: 3.8 / 10; World Happiness, 2025
Safe drinking water: 12%; of population, 2024
Road deaths: 34.9; per 100k/yr, 2019
Income group: Low; World Bank
English: Very low; EF EPI 400

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 Isiro (2.7739°, 27.616°, elevation 761 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	27	20
2	27	20
3	27	20
4	27	20
5	27	20
6	27	20
7	27	20
8	27	20
9	27	20
10	27	20
11	27	20
12	27	20
13	27	20
14	27	20
15	27	20
16	27	20
17	27	20
18	27	20
19	27	20
20	27	20
21	27	20
22	27	20
23	27	20
24	27	20
25	27	20
26	27	20
27	27	20
28	27	20
29	27	20
30	27	20

	Clearer (%)	Cloudier (%)
1	15	85
2	15	85
3	15	85
4	15	85
5	15	85
6	15	85
7	15	85
8	15	85
9	15	85
10	16	84
11	16	84
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	15	85
18	15	85
19	14	86
20	14	86
21	14	86
22	14	86
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	12	88
29	12	88
30	11	89

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

	Muggy (%)	Oppressive (%)
1	87	13
2	87	13
3	87	13
4	86	14
5	86	14
6	85	15
7	85	15
8	84	16
9	84	16
10	83	17
11	82	18
12	82	18
13	81	19
14	80	20
15	80	20
16	79	21
17	78	22
18	77	23
19	77	23
20	76	24
21	76	24
22	76	24
23	76	24
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	75	25
30	75	25

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

	Clearer (%)	Cloudier (%)
1	15	85
2	15	85
3	15	85
4	15	85
5	15	85
6	15	85
7	15	85
8	15	85
9	15	85
10	16	84
11	16	84
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	15	85
18	15	85
19	14	86
20	14	86
21	14	86
22	14	86
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	12	88
29	12	88
30	11	89

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

	Muggy (%)	Oppressive (%)
1	87	13
2	87	13
3	87	13
4	86	14
5	86	14
6	85	15
7	85	15
8	84	16
9	84	16
10	83	17
11	82	18
12	82	18
13	81	19
14	80	20
15	80	20
16	79	21
17	78	22
18	77	23
19	77	23
20	76	24
21	76	24
22	76	24
23	76	24
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	75	25
30	75	25

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

	Clearer (%)	Cloudier (%)
1	15	85
2	15	85
3	15	85
4	15	85
5	15	85
6	15	85
7	15	85
8	15	85
9	15	85
10	16	84
11	16	84
12	15	85
13	15	85
14	15	85
15	15	85
16	15	85
17	15	85
18	15	85
19	14	86
20	14	86
21	14	86
22	14	86
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	12	88
29	12	88
30	11	89

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

	Muggy (%)	Oppressive (%)
1	87	13
2	87	13
3	87	13
4	86	14
5	86	14
6	85	15
7	85	15
8	84	16
9	84	16
10	83	17
11	82	18
12	82	18
13	81	19
14	80	20
15	80	20
16	79	21
17	78	22
18	77	23
19	77	23
20	76	24
21	76	24
22	76	24
23	76	24
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	75	25
30	75	25