Calcutta weather in September

In September, Calcutta sees average daytime highs of 27°C and overnight lows near 15°C, with 30 mm of rain across 5.3 wet days and about 11.8 hours of daylight. It is the 7th-warmest and 8th-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 62% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Calcutta's 5th-clearest and 1st-windiest month. For the whole year in context, see Calcutta's year-round climate.

Daytime high
27°
7th warmest
Overnight low
15°
5th coldest
Rainfall
30 mm
5.3 wet days
Daylight
11 h 54 min
5:54 AM – 5:45 PM
Cloud cover
36%
5th clearest
Wind
10 km/h
1st windiest
Solar energy
5.15 kWh/m²
Travel score
7.6
out of 10

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 Calcutta reaches about 27°C in the afternoon and slips back to 15°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 34°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12614
22714
32714
42714
52714
62714
72714
82714
92714
102714
112715
122715
132715
142715
152715
162715
172715
182715
192715
202715
212715
222715
232715
242716
252716
262716
272716
282716
292716
302716

Calcutta weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 20°14014.713.44.8
Feb29° / 20°12113.212.94.9
Mar29° / 19°9011.812.25.7
Apr27° / 17°467.611.47.2
May26° / 13°15310.88.5
Jun24° / 11°8210.59.1
Jul24° / 10°112.310.68.9
Aug25° / 12°163.311.18.6
Sep27° / 15°305.311.87.6
Oct27° / 17°569.812.66.5
Nov28° / 18°10412.813.25.4
Dec29° / 19°13215.113.54.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% 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 27%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38020
48020
57921
67921
77822
87723
97723
107525
117525
127426
137426
147228
157228
167228
177228
187129
197129
207030
217030
226931
236931
246832
256733
266634
276634
286535
296436
306337

Chance of precipitation in September

Any precipitation

Calcutta gets around 30 mm of rain over 5.3 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 17% and peaks near 25% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
111
211
311
412
512
613
713
813
914
1014
1115
1215
1315
1416
1516
1617
1717
1818
1918
2019
2120
2220
2321
2422
2522
2623
2723
2824
2925
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 65% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1811810
2801910
3801910
4792010
5782110
6782110
7762220
8752320
9742420
10732520
11722620
12712720
13702820
14682930
15673030
16663130
17643240
18633340
19613450
20593560
21573670
22563770
23543880
24533890
255139100
264939110
274839120
284739130
294539151
304439161

Wind in September

Winds average 10 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 6:10 AM to 5:38 AM, and sunset from 5:39 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:105:39
211.56:095:40
311.56:085:40
411.66:075:41
511.66:065:41
611.66:055:41
711.66:045:42
811.76:035:42
911.76:025:42
1011.76:005:43
1111.75:595:43
1211.85:585:44
1311.85:575:44
1411.85:565:44
1511.85:555:45
1611.95:545:45
1711.95:535:45
1811.95:515:46
1911.95:505:46
2012.05:495:47
2112.05:485:47
2212.05:475:47
2312.05:465:48
2412.15:455:48
2512.15:445:49
2612.15:435:49
2712.15:415:49
2812.25:405:50
2912.25:395:50
3012.25:385:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.15 kWh/m².

For context, solar energy here swings from a low near 3.69 kWh/m² to a high of 5.77 kWh/m² in January across the year — September's 5.15 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in September

Hazard calendar for Calcutta

In seasonPeak

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

Calcutta's rainy season runs November–March, when most of the year's rain falls.

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

Is September a good time to visit Calcutta?

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

7.6
Sightseeing
5th-best month of the year
7.7
Beach & pool
2nd-best month of the year

September is one of the better times to visit Calcutta for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Calcutta in September

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

In September, Calcutta sees daytime highs around 27°C and nights near 15°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

UV index in Calcutta in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Calcutta peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 5 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighHighVery highExtremeJan 20UV 14Jun 21UV 5
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar12Extreme
Apr8Very high
May6High
Jun5Moderate
Jul5High
Aug7High
Sep8Very high
Oct10Very high
Nov12Extreme
Dec13Extreme

Air quality in Calcutta 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 Calcutta is worst in July — around 32 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (January, 12 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 1832 µg/m³Jan 1612 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar17Moderate
Apr23Moderate
May31Moderate
Jun30Moderate
Jul32Moderate
Aug30Moderate
Sep26Moderate
Oct19Moderate
Nov18Moderate
Dec13Moderate
Location & terrain

Where is Calcutta?

Calcutta sits at 25.0°S, 31.2°E, 435 m above sea level, in South Africa. The nearest listed city is Mkhuhlu, 1.0 km away.

Topography around Calcutta

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

Within 3 km, the terrain around Calcutta has only modest variations in elevation — a maximum elevation change of 118 m around an average of 432 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 526 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,118 m.

The land around Calcutta is covered by artificial surfaces (36%) and grassland (32%) within 3 km, grassland (49%) and trees (22%) within 16 km, and grassland (46%), trees (27%) and shrubs (22%) within 80 km.

3 km
118 m
16 km
526 m
80 km
2,118 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Mkhuhlu 1.0 km · Hlanganani 7.0 km · Dwarsloop 25 km · Mafemani 27 km · Thulamahashi 29 km · White River 45 km · Acornhoek 46 km · Sabie 48 km

South Africa travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / M / N
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$6,598
2025
Happiness
5.0 / 10
World Happiness, 2025
Safe drinking water
68%
of population, 2024
Homicide rate
43.7
per 100k, 2022
Road deaths
22.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very high
EF EPI 602
Religion
Christian 86%or other traditional African religions 5%nothing in particular 5%Muslim 2%

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 Calcutta (-24.9832°, 31.2349°, elevation 435 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).