Sylhet weather in September

In September, Sylhet sees average daytime highs of 31°C and overnight lows near 25°C, with 523 mm of rain across 27.6 wet days and about 12.2 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 11% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Sylhet's 9th-clearest and 7th-windiest month. For the whole year in context, see Sylhet's year-round climate.

Daytime high: 31°; 2nd warmest
Overnight low: 25°; 10th coldest
Rainfall: 523 mm; 27.6 wet days
Daylight: 12 h 06 min; 5:43 AM – 5:51 PM
Cloud cover: 79%; 9th clearest
Wind: 4 km/h; 7th windiest
Solar energy: 3.63 kWh/m²
Travel score: 2.6; out of 10

Sylhet is capital and largest city of Sylhet Division, Bangladesh.

Air quality: Severe; PM2.5 59.8 µg/m³ · 2018
Density: 8,943/km²; people per km²
Founded: 1867

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

← August Sylhet 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 31°C through the month.

A typical September day in Sylhet reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°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)	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31
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	24	24	24

	Avg high (°C)	Avg low (°C)
1	31	25
2	31	25
3	31	25
4	31	25
5	31	25
6	31	25
7	31	25
8	31	25
9	31	25
10	31	25
11	31	25
12	31	25
13	31	25
14	31	25
15	31	25
16	31	25
17	31	25
18	31	25
19	31	25
20	31	25
21	31	25
22	31	25
23	31	25
24	31	25
25	31	25
26	31	25
27	31	25
28	31	24
29	31	24
30	31	24

How September really feels in Sylhet

Once humidity and wind are folded in, September averages 30 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.

Sylhet weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	24° / 11°	10	1.8	10.6	9.0
Feb	26° / 14°	48	4.6	11.1	8.2
Mar	29° / 18°	187	11.2	11.8	6.1
Apr	29° / 21°	560	21.4	12.6	4.0
May	30° / 23°	759	27.6	13.2	3.1
Jun	30° / 25°	953	29.5	13.5	2.5
Jul	31° / 25°	941	30.8	13.4	2.3
Aug	31° / 26°	733	30.7	12.9	2.3
Sep	31° / 25°	523	27.6	12.2	2.6
Oct	30° / 23°	217	14.8	11.4	4.7
Nov	28° / 17°	28	2.3	10.8	7.8
Dec	25° / 13°	12	1.1	10.5	9.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 78%. Skies tend to open up as the month goes on.

	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 (%)	9	11	11	11	12	14	14	15	15	16	16	17	17	18	18	19	20	21	22	23	25	25	27	29	31	33	34	37	39	41
Cloudier (%)	91	89	89	89	88	86	86	85	85	84	84	83	83	82	82	81	80	79	78	77	75	75	73	71	69	67	66	63	61	59

	Clearer (%)	Cloudier (%)
1	9	91
2	11	89
3	11	89
4	11	89
5	12	88
6	14	86
7	14	86
8	15	85
9	15	85
10	16	84
11	16	84
12	17	83
13	17	83
14	18	82
15	18	82
16	19	81
17	20	80
18	21	79
19	22	78
20	23	77
21	25	75
22	25	75
23	27	73
24	29	71
25	31	69
26	33	67
27	34	66
28	37	63
29	39	61
30	41	59

Chance of precipitation in September

Any precipitation

Sylhet gets around 523 mm of rain over 27.6 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 92% and peaks near 98% on the wettest days. The odds ease toward the end of the month.

	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	97	97	97	96	96	95	95	94	94	93	93	93	92	92	91	91	90	89	89	88	87	86	86	85	84	83	82

	Rain chance (%)
1	98
2	98
3	98
4	97
5	97
6	97
7	96
8	96
9	95
10	95
11	94
12	94
13	93
14	93
15	93
16	92
17	92
18	91
19	91
20	90
21	89
22	89
23	88
24	87
25	86
26	86
27	85
28	84
29	83
30	82

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 90% 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 (%)	0	1	1	1	1	2	2	3	3	4	4	5	6	6	7	8	8	9	10	11	12	14	15	16	18	19	21	23	25	27
Miserable (%)	100	99	99	99	99	98	98	97	97	96	96	95	94	94	93	92	92	91	90	89	88	86	85	84	82	81	79	77	75	73

	Oppressive (%)	Miserable (%)
1	0	100
2	1	99
3	1	99
4	1	99
5	1	99
6	2	98
7	2	98
8	3	97
9	3	97
10	4	96
11	4	96
12	5	95
13	6	94
14	6	94
15	7	93
16	8	92
17	8	92
18	9	91
19	10	90
20	11	89
21	12	88
22	14	86
23	15	85
24	16	84
25	18	82
26	19	81
27	21	79
28	23	77
29	25	75
30	27	73

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 30 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over September. Sunrise moves from 5:37 AM to 5:48 AM, and sunset from 6:08 PM to 5:36 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)	12.5	12.5	12.5	12.4	12.4	12.4	12.4	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.8	11.8	11.8
Sunrise (AM)	5:37	5:37	5:38	5:38	5:38	5:39	5:39	5:40	5:40	5:40	5:41	5:41	5:41	5:42	5:42	5:43	5:43	5:43	5:44	5:44	5:44	5:45	5:45	5:46	5:46	5:46	5:47	5:47	5:48	5:48
Sunset (PM)	6:08	6:06	6:05	6:04	6:03	6:02	6:01	6:00	5:59	5:58	5:57	5:56	5:54	5:53	5:52	5:51	5:50	5:49	5:48	5:47	5:46	5:44	5:43	5:42	5:41	5:40	5:39	5:38	5:37	5:36

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.5	5:37	6:08
2	12.5	5:37	6:06
3	12.5	5:38	6:05
4	12.4	5:38	6:04
5	12.4	5:38	6:03
6	12.4	5:39	6:02
7	12.4	5:39	6:01
8	12.3	5:40	6:00
9	12.3	5:40	5:59
10	12.3	5:40	5:58
11	12.3	5:41	5:57
12	12.2	5:41	5:56
13	12.2	5:41	5:54
14	12.2	5:42	5:53
15	12.2	5:42	5:52
16	12.1	5:43	5:51
17	12.1	5:43	5:50
18	12.1	5:43	5:49
19	12.1	5:44	5:48
20	12.0	5:44	5:47
21	12.0	5:44	5:46
22	12.0	5:45	5:44
23	12.0	5:45	5:43
24	11.9	5:46	5:42
25	11.9	5:46	5:41
26	11.9	5:46	5:40
27	11.9	5:47	5:39
28	11.8	5:47	5:38
29	11.8	5:48	5:37
30	11.8	5:48	5:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.63 kWh/m².

For context, solar energy here swings from a low near 3.23 kWh/m² to a high of 5.31 kWh/m² in March across the year — September's 3.63 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)	3.5	3.5	3.5	3.5	3.5	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.8	3.8
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	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	3.6	Moderate
11	3.6	Moderate
12	3.6	Moderate
13	3.6	Moderate
14	3.6	Moderate
15	3.6	Moderate
16	3.6	Moderate
17	3.7	Moderate
18	3.7	Moderate
19	3.7	Moderate
20	3.7	Moderate
21	3.7	Moderate
22	3.7	Moderate
23	3.7	Moderate
24	3.7	Moderate
25	3.7	Moderate
26	3.7	Moderate
27	3.7	Moderate
28	3.7	Moderate
29	3.8	Moderate
30	3.8	Moderate

Planning a trip in September

Hazard calendar for Sylhet

In seasonPeak

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

Sylhet's monsoon runs April–September, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Sylhet?

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

2.6

Sightseeing

9th-best month of the year

3.9

Beach & pool

9th-best month of the year

September is a weaker month for outdoor sightseeing in Sylhet.

What to pack for Sylhet in September

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

In September, Sylhet sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

UV index in Sylhet in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks 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 Sylhet peaks around July 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 17 at about 4 (moderate).

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)	4	5	8	7	8	6	12	10	11	6	6	5
Level	Moderate	Moderate	Very high	High	Very high	High	Extreme	Extreme	Extreme	High	High	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	Moderate
Mar	8	Very high
Apr	7	High
May	8	Very high
Jun	6	High
Jul	12	Extreme
Aug	10	Extreme
Sep	11	Extreme
Oct	6	High
Nov	6	High
Dec	5	Moderate

Air quality in Sylhet 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 Sylhet is worst in January — around 100 µg/m³ PM2.5 (unhealthy), about 4.3× the cleanest month (July, 23 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Sylhet's WHO annual average of 59.8 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	100	94	95	62	44	32	23	30	36	51	67	83
Level	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Poor	Moderate	Moderate	Moderate	Poor	Poor	Unhealthy	Unhealthy

	PM2.5 (µg/m³)	Level
Jan	100	Unhealthy
Feb	94	Unhealthy
Mar	95	Unhealthy
Apr	62	Unhealthy
May	44	Poor
Jun	32	Moderate
Jul	23	Moderate
Aug	30	Moderate
Sep	36	Poor
Oct	51	Poor
Nov	67	Unhealthy
Dec	83	Unhealthy

Location & terrain

Where is Sylhet?

Sylhet sits at 24.9°N, 91.9°E, 26 m above sea level, in Bangladesh. The nearest listed city is Mymensingh, 149 km away.

Topography around Sylhet

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

Within 3 km, the terrain around Sylhet has only modest variations in elevation — a maximum elevation change of 55 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 82 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,953 m.

The land around Sylhet is covered by trees (52%) and artificial surfaces (41%) within 3 km, cropland (53%) and trees (39%) within 16 km, and trees (46%) and cropland (40%) within 80 km.

3 km

55 m

trees 52%

16 km

82 m

cropland 53%

80 km

1,953 m

trees 46%

treesgrasslandcroplandartificial surfaceswaterwetland

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

September weather nearby: Mymensingh 149 km · Dhaka 199 km · Samdrup Jongkhar 215 km · Tamu 258 km · Mongar 272 km · Trashigang 273 km · Rangpur 280 km · Chittagong 285 km

Bangladesh travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type A / C / D / G; 220 V · 50 Hz
Prices: ≈ 25% of US; price level, 2025
GDP per capita: $2,597; 2025
Happiness: 4.3 / 10; World Happiness, 2025
Safe drinking water: 59%; of population, 2024
Homicide rate: 2.3; per 100k, 2018
Road deaths: 15.3; per 100k/yr, 2019
Income group: Lower middle; World Bank
English: Moderate; EF EPI 506
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 Sylhet (24.899°, 91.872°, elevation 26 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	31	25
2	31	25
3	31	25
4	31	25
5	31	25
6	31	25
7	31	25
8	31	25
9	31	25
10	31	25
11	31	25
12	31	25
13	31	25
14	31	25
15	31	25
16	31	25
17	31	25
18	31	25
19	31	25
20	31	25
21	31	25
22	31	25
23	31	25
24	31	25
25	31	25
26	31	25
27	31	25
28	31	24
29	31	24
30	31	24

	Clearer (%)	Cloudier (%)
1	9	91
2	11	89
3	11	89
4	11	89
5	12	88
6	14	86
7	14	86
8	15	85
9	15	85
10	16	84
11	16	84
12	17	83
13	17	83
14	18	82
15	18	82
16	19	81
17	20	80
18	21	79
19	22	78
20	23	77
21	25	75
22	25	75
23	27	73
24	29	71
25	31	69
26	33	67
27	34	66
28	37	63
29	39	61
30	41	59

	Rain chance (%)
1	98
2	98
3	98
4	97
5	97
6	97
7	96
8	96
9	95
10	95
11	94
12	94
13	93
14	93
15	93
16	92
17	92
18	91
19	91
20	90
21	89
22	89
23	88
24	87
25	86
26	86
27	85
28	84
29	83
30	82

	Oppressive (%)	Miserable (%)
1	0	100
2	1	99
3	1	99
4	1	99
5	1	99
6	2	98
7	2	98
8	3	97
9	3	97
10	4	96
11	4	96
12	5	95
13	6	94
14	6	94
15	7	93
16	8	92
17	8	92
18	9	91
19	10	90
20	11	89
21	12	88
22	14	86
23	15	85
24	16	84
25	18	82
26	19	81
27	21	79
28	23	77
29	25	75
30	27	73

	Avg high (°C)	Avg low (°C)
1	31	25
2	31	25
3	31	25
4	31	25
5	31	25
6	31	25
7	31	25
8	31	25
9	31	25
10	31	25
11	31	25
12	31	25
13	31	25
14	31	25
15	31	25
16	31	25
17	31	25
18	31	25
19	31	25
20	31	25
21	31	25
22	31	25
23	31	25
24	31	25
25	31	25
26	31	25
27	31	25
28	31	24
29	31	24
30	31	24

	Clearer (%)	Cloudier (%)
1	9	91
2	11	89
3	11	89
4	11	89
5	12	88
6	14	86
7	14	86
8	15	85
9	15	85
10	16	84
11	16	84
12	17	83
13	17	83
14	18	82
15	18	82
16	19	81
17	20	80
18	21	79
19	22	78
20	23	77
21	25	75
22	25	75
23	27	73
24	29	71
25	31	69
26	33	67
27	34	66
28	37	63
29	39	61
30	41	59

	Rain chance (%)
1	98
2	98
3	98
4	97
5	97
6	97
7	96
8	96
9	95
10	95
11	94
12	94
13	93
14	93
15	93
16	92
17	92
18	91
19	91
20	90
21	89
22	89
23	88
24	87
25	86
26	86
27	85
28	84
29	83
30	82

	Oppressive (%)	Miserable (%)
1	0	100
2	1	99
3	1	99
4	1	99
5	1	99
6	2	98
7	2	98
8	3	97
9	3	97
10	4	96
11	4	96
12	5	95
13	6	94
14	6	94
15	7	93
16	8	92
17	8	92
18	9	91
19	10	90
20	11	89
21	12	88
22	14	86
23	15	85
24	16	84
25	18	82
26	19	81
27	21	79
28	23	77
29	25	75
30	27	73

	Avg high (°C)	Avg low (°C)
1	31	25
2	31	25
3	31	25
4	31	25
5	31	25
6	31	25
7	31	25
8	31	25
9	31	25
10	31	25
11	31	25
12	31	25
13	31	25
14	31	25
15	31	25
16	31	25
17	31	25
18	31	25
19	31	25
20	31	25
21	31	25
22	31	25
23	31	25
24	31	25
25	31	25
26	31	25
27	31	25
28	31	24
29	31	24
30	31	24

	Clearer (%)	Cloudier (%)
1	9	91
2	11	89
3	11	89
4	11	89
5	12	88
6	14	86
7	14	86
8	15	85
9	15	85
10	16	84
11	16	84
12	17	83
13	17	83
14	18	82
15	18	82
16	19	81
17	20	80
18	21	79
19	22	78
20	23	77
21	25	75
22	25	75
23	27	73
24	29	71
25	31	69
26	33	67
27	34	66
28	37	63
29	39	61
30	41	59

	Rain chance (%)
1	98
2	98
3	98
4	97
5	97
6	97
7	96
8	96
9	95
10	95
11	94
12	94
13	93
14	93
15	93
16	92
17	92
18	91
19	91
20	90
21	89
22	89
23	88
24	87
25	86
26	86
27	85
28	84
29	83
30	82

	Oppressive (%)	Miserable (%)
1	0	100
2	1	99
3	1	99
4	1	99
5	1	99
6	2	98
7	2	98
8	3	97
9	3	97
10	4	96
11	4	96
12	5	95
13	6	94
14	6	94
15	7	93
16	8	92
17	8	92
18	9	91
19	10	90
20	11	89
21	12	88
22	14	86
23	15	85
24	16	84
25	18	82
26	19	81
27	21	79
28	23	77
29	25	75
30	27	73