Kolkata, India climate

Aw Tropical savanna (dry winter)

Kolkata has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 36°C, while the coldest is January averaging around 13°C at night. Precipitation totals about 1615 mm a year and is strongly seasonal — August alone averages 342 mm while December barely receives 6 mm.

☀️ All year

Very hot

Daytime highs near 36°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 13°C.

🌧️ Rain

Very wet

About 1615 mm of rain a year.

Wettest in August

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Kolkata climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	25	29	34	36	36	35	33	33	33	32	30	26
Avg temp (°C)	19	23	28	30	31	31	30	30	30	28	25	20
Avg low (°C)	13	16	21	25	26	26	26	26	26	24	19	14
Precipitation (mm)	16	28	27	48	132	241	337	342	274	139	26	6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	25	29	34	36	36	35
Avg temp (°C)	19	23	28	30	31	31
Avg low (°C)	13	16	21	25	26	26
Precipitation (mm)	16	28	27	48	132	241

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	33	33	32	30	26
Avg temp (°C)	30	30	30	28	25	20
Avg low (°C)	26	26	26	24	19	14
Precipitation (mm)	337	342	274	139	26	6

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	25	26	33	45	62	82	88	87	77	48	27	24
Relative humidity (%)	58	52	52	60	70	83	89	90	90	83	76	68
Wind speed (m/s)	1.6	1.7	2.0	2.7	2.8	2.9	2.8	2.4	1.8	1.3	1.4	1.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	25	26	33	45	62	82
Relative humidity (%)	58	52	52	60	70	83
Wind speed (m/s)	1.6	1.7	2.0	2.7	2.8	2.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	88	87	77	48	27	24
Relative humidity (%)	89	90	90	83	76	68
Wind speed (m/s)	2.8	2.4	1.8	1.3	1.4	1.5

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Netaji Subhash Chandra Bose Intl, a weather station, about 13 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →