Patna climate
Patna (Bihar, India) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 26 °C79 °F, and about 994 mm39 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Patna climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2374 | 846 | 1660 | 110.4 |
| Feb | 2883 | 1253 | 2068 | 140.5 |
| Mar | 3595 | 1864 | 2679 | 90.4 |
| Apr | 41105 | 2475 | 3290 | 140.6 |
| May | 42108 | 2882 | 3595 | 502.0 |
| Jun | 40103 | 3085 | 3594 | 1526.0 |
| Jul | 3493 | 2781 | 3087 | 27611 |
| Aug | 3290 | 2679 | 2985 | 2339.2 |
| Sep | 3188 | 2577 | 2882 | 1817.1 |
| Oct | 3187 | 2069 | 2678 | 502.0 |
| Nov | 2781 | 1458 | 2170 | 10.1 |
| Dec | 2474 | 1049 | 1762 | 30.1 |
| Year | 42108 | 846 | 2679 | 99439 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 51% | 32% | 3.2 | 10:42 |
| Feb | 44% | 25% | 4.5 | 11:16 |
| Mar | 31% | 24% | 5.7 | 11:57 |
| Apr | 26% | 29% | 6.4 | 12:44 |
| May | 34% | 41% | 6.4 | 13:23 |
| Jun | 50% | 66% | 5.5 | 13:43 |
| Jul | 77% | 82% | 4.6 | 13:35 |
| Aug | 83% | 77% | 4.9 | 13:02 |
| Sep | 84% | 65% | 4.7 | 12:16 |
| Oct | 74% | 28% | 4.6 | 11:30 |
| Nov | 64% | 14% | 4.0 | 10:51 |
| Dec | 58% | 25% | 3.1 | 10:33 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Patna is like
The warmest month is May, with an average high of 42 °C108 °F and a low of 28 °C82 °F. The coldest is January, when highs average 23 °C74 °F and lows 8 °C46 °F. Seasons are strongly marked: the warmest month is on average 19.4 °C35 °F warmer than the coldest.
Annual precipitation is moderate at about 994 mm39 in. The wettest three-month stretch is July–September, which brings 69% of the annual total. Months with less than 20 mm0.8 in on average: November–April. The wettest month is July (276 mm11 in), the driest is November (1 mm0.1 in).
Relative humidity ranges from 26% in April to 84% in September. The clearest skies (lowest average cloud amount, 14%) are typical of November. Average wind speed near the ground ranges from 4 km/h (3 mph) in November to 10 km/h (6 mph) in June. Daylight lasts from about 10.5 hours in December to 13.7 hours in June.
Best time to visit Patna
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–February: average highs of 23 °C74 °F to 28 °C83 °F with 1 mm0.1 in to 14 mm0.5 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 34 °C93 °F, very wet (276 mm11 in) and humid (77% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
Patna weather by month
- January23 °C74 °F / 8 °C46 °F
- February28 °C83 °F / 12 °C53 °F
- March35 °C95 °F / 18 °C64 °F
- April41 °C105 °F / 24 °C75 °F
- May42 °C108 °F / 28 °C82 °F
- June40 °C103 °F / 30 °C85 °F
- July34 °C93 °F / 27 °C81 °F
- August32 °C90 °F / 26 °C79 °F
- September31 °C88 °F / 25 °C77 °F
- October31 °C87 °F / 20 °C69 °F
- November27 °C81 °F / 14 °C58 °F
- December24 °C74 °F / 10 °C49 °F
What to pack for Patna
- Winter (December–February) — highs 2374 to 28 °C83 °F, lows 846 to 12 °C53 °F, about 9 mm0.4 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 3595 to 42 °C108 °F, lows 1864 to 28 °C82 °F, about 24 mm1.0 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Summer (June–August) — highs 3290 to 40 °C103 °F, lows 2679 to 30 °C85 °F, about 220 mm8.7 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 2781 to 31 °C88 °F, lows 1458 to 25 °C77 °F, about 77 mm3.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Patna compares
Of the 382 places in India covered by World Climates, Patna is the 181st warmest by annual mean temperature and the 184th wettest by annual precipitation. See all of them on the India climate page.
Places in other countries with the most similar temperature and rainfall pattern: Janakpur (Nepal, Cwa), Birgañj (Nepal, Cwa) and Lahan (Nepal, Cwa).
The same NASA POWER grid cell also contains Dinapur Nizamat (pop. 182,429), Dinapore (pop. 152,940) and Hajipur (pop. 147,688). Their long-term averages in this dataset are essentially the same as for Patna, so they do not have separate pages.
Nearby places
- Chapra 44 km · 26 °C79 °F · 1,041 mm41 in
- Jahanabad 45 km · 26 °C79 °F · 1,013 mm40 in
- Arrah 48 km · 26 °C79 °F · 968 mm38 in
- Bihar Sharif 59 km · 26 °C79 °F · 1,013 mm40 in
- Muzaffarpur 64 km · 26 °C79 °F · 1,060 mm42 in
- Gaya 90 km · 26 °C79 °F · 1,013 mm40 in
- Begusarai 102 km · 26 °C79 °F · 1,026 mm40 in
- Siwan 105 km · 26 °C79 °F · 1,012 mm40 in
Frequently asked questions
What is the warmest month in Patna?
May is the warmest month in Patna, with an average high of 42 °C (108 °F) and an average low of 28 °C (82 °F).
What is the coldest month in Patna?
January is the coldest month, with an average high of 23 °C (74 °F) and an average low of 8 °C (46 °F).
When does it rain the most in Patna?
July is the wettest month with about 276 mm (10.9 in) of precipitation; November is the driest with about 1 mm (0.1 in).
What is the best time to visit Patna?
Judging by long-term averages, the most comfortable months are November–February.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.