Patna climate

Name: Patna
Address: IN

Patna is warmest in May, with average highs of 38 °C, and coldest in January, when nights average 11 °C. July is the wettest month (314 mm) and November the driest (5.8 mm). Figures are 1991–2020 climate normals.

Across a full year Patna averages 1,116 mm of rain and 300 days above 25 °C.

India · population 1,684,297 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month May 38 °C
Coldest month January 11 °C
Driest month November 6 mm
Wettest month July 314 mm
Least cloud November 15 % cloud
Hottest on record June 45 °C
Coldest on record December 5.6 °C

What to expectPatna through the year

Patna has a clear annual cycle: average daily highs run from 22 °C in January to 38 °C in May, a swing of 16 °C in mean temperature across the year.

Counted across a normal year, 300 days a year reach 25 °C, 211 of them reach 30 °C. The warmest reading in the 1991–2020 record is 45 °C, in June.

Rain is strongly seasonal. July averages 314 mm against 6 mm in November — 54 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	22.0 °C	17 mm	21 %
February	25.9 °C	14 mm	19 %
March	32.2 °C	11 mm	19 %
April	37.3 °C	14 mm	20 %
May	37.9 °C	34 mm	23 %
June	35.8 °C	182 mm	60 %
July	32.1 °C	314 mm	89 %
August	31.7 °C	265 mm	88 %
September	31.0 °C	200 mm	68 %
October	30.2 °C	51 mm	29 %
November	27.6 °C	6 mm	15 %
December	23.7 °C	7 mm	18 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	22.0 °C	10.6 °C	16.1 °C	28.1 °C	6.0 °C	2	0
February	25.9 °C	13.4 °C	19.7 °C	35.8 °C	7.2 °C	17	2
March	32.2 °C	18.4 °C	25.4 °C	40.5 °C	11.0 °C	31	23
April	37.3 °C	23.2 °C	30.3 °C	43.5 °C	17.3 °C	30	30
May	37.9 °C	26.1 °C	32.0 °C	44.9 °C	19.9 °C	31	31
June	35.8 °C	27.1 °C	31.3 °C	45.0 °C	23.5 °C	30	28
July	32.1 °C	26.4 °C	28.9 °C	39.8 °C	24.4 °C	31	27
August	31.7 °C	26.1 °C	28.5 °C	35.8 °C	24.3 °C	31	27
September	31.0 °C	25.2 °C	27.8 °C	34.8 °C	19.5 °C	30	23
October	30.2 °C	21.7 °C	25.9 °C	33.9 °C	15.4 °C	31	17
November	27.6 °C	16.5 °C	21.9 °C	32.1 °C	9.6 °C	28	2
December	23.7 °C	12.2 °C	17.8 °C	29.8 °C	5.6 °C	8	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	17 mm	2	11 h/day	21 %	72 %	12 km/h
February	14 mm	2	11 h/day	19 %	64 %	14 km/h
March	11 mm	2	12 h/day	19 %	48 %	17 km/h
April	14 mm	3	13 h/day	20 %	43 %	19 km/h
May	34 mm	6	13 h/day	23 %	54 %	19 km/h
June	182 mm	16	14 h/day	60 %	68 %	18 km/h
July	314 mm	26	14 h/day	89 %	82 %	16 km/h
August	265 mm	26	13 h/day	88 %	84 %	15 km/h
September	200 mm	20	12 h/day	68 %	84 %	14 km/h
October	51 mm	6	12 h/day	29 %	78 %	9.8 km/h
November	6 mm	1	11 h/day	15 %	68 %	10 km/h
December	7 mm	1	11 h/day	18 %	70 %	11 km/h

How Patna compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Patna	38 °C	11 °C	1,116 mm	300
Arrah · India	38 °C	10 °C	1,136 mm	300
Bihār Sharīf · India	38 °C	9.9 °C	1,085 mm	301
Muzaffarpur · India	37 °C	10 °C	1,243 mm	301

Where Patna ranks

Ranking	Position	Value
Places with the best weather in Asia in December	46th of 50	95/100

Planning a trip? See the best time to visit Patna.

QuestionsCommon questions about Patna’s climate

When is the best time to visit Patna?

That depends on what you want, so the honest answer is a comparison rather than a single month. February, November, December sit closest to 20 °C on average, May is the warmest month and November the driest. The month-by-month table above has the full picture.

How hot does Patna get?

In May, the warmest month, daily highs average 38 °C. About 211 days a year pass 30 °C. The highest value in the 1991–2020 record is 45 °C.

How cold does it get in winter?

Nights average 11 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Patna?

July, averaging 314 mm over 26 days with rain. The driest month is November with 6 mm. The year as a whole averages 1,116 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Patna rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 25.594°, 85.136° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.