Biratnagar climate
Biratnagar (Nepal) has a monsoon-influenced humid subtropical climate (Köppen Cwa). The average temperature over the year is 26 °C79 °F, and about 1,394 mm55 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Biratnagar climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2474 | 1152 | 1763 | 60.2 |
| Feb | 2882 | 1457 | 2170 | 100.4 |
| Mar | 3492 | 1966 | 2679 | 230.9 |
| Apr | 3799 | 2374 | 3086 | 532.1 |
| May | 3799 | 2678 | 3188 | 1285.1 |
| Jun | 3696 | 2780 | 3188 | 2168.5 |
| Jul | 3290 | 2680 | 2985 | 37915 |
| Aug | 3289 | 2679 | 2984 | 26911 |
| Sep | 3188 | 2577 | 2882 | 2359.3 |
| Oct | 3086 | 2271 | 2678 | 682.7 |
| Nov | 2882 | 1763 | 2272 | 40.2 |
| Dec | 2476 | 1355 | 1965 | 20.1 |
| Year | 3799 | 1152 | 2679 | 1,39455 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 49% | 32% | 3.2 | 10:39 |
| Feb | 41% | 36% | 4.2 | 11:14 |
| Mar | 32% | 40% | 5.3 | 11:56 |
| Apr | 37% | 47% | 5.8 | 12:45 |
| May | 53% | 59% | 5.7 | 13:26 |
| Jun | 69% | 76% | 4.9 | 13:47 |
| Jul | 85% | 87% | 4.4 | 13:39 |
| Aug | 86% | 83% | 4.6 | 13:04 |
| Sep | 86% | 72% | 4.3 | 12:16 |
| Oct | 77% | 41% | 4.5 | 11:29 |
| Nov | 65% | 21% | 4.0 | 10:48 |
| Dec | 57% | 23% | 3.3 | 10:29 |
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 Biratnagar is like
The warmest month is May, with an average high of 37 °C99 °F and a low of 26 °C78 °F. The coldest is January, when highs average 24 °C74 °F and lows 11 °C52 °F. There is a clear seasonal cycle, with 14.1 °C25.4 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,394 mm55 in of precipitation per year. The wettest three-month stretch is July–September, which brings 63% of the annual total. Months with less than 20 mm0.8 in on average: November–February. The wettest month is July (379 mm15 in), the driest is December (2 mm0.1 in).
Relative humidity ranges from 32% in March to 86% in August. The clearest skies (lowest average cloud amount, 21%) are typical of November. Average wind speed near the ground ranges from 4 km/h (2 mph) in November to 7 km/h (5 mph) in April. Daylight lasts from about 10.5 hours in December to 13.8 hours in June.
Best time to visit Biratnagar
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–February. Average highs then reach 24 °C74 °F to 28 °C82 °F. Precipitation is 2 mm0.1 in to 10 mm0.4 in per month.
The most challenging month is July, which is hot, with average highs of 32 °C90 °F, very wet (379 mm15 in) and humid (85% relative humidity).
Comfort score: months are ranked by how close they come to an ideal. That means 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.
What to pack for Biratnagar
- Winter (December–February) — highs 2474 to 28 °C82 °F, lows 1152 to 14 °C57 °F, about 6 mm0.2 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 3492 to 37 °C99 °F, lows 1966 to 26 °C78 °F, about 68 mm2.7 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Summer (June–August) — highs 3289 to 36 °C96 °F, lows 2679 to 27 °C80 °F, about 288 mm11 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 2882 to 31 °C88 °F, lows 1763 to 25 °C77 °F, about 102 mm4.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Biratnagar compares
The nearest larger place is Purnia, about 78 km to the south. Compared with it, Biratnagar is on average 0.5 °C0.8 °F warmer. It receives a similar amount of precipitation. The difference is largest in December (1.7 °C3 °F warmer).
World Climates covers 13 places in Nepal. By annual mean temperature, Biratnagar is the 3rd warmest of them. By annual precipitation, it is the 2nd wettest. See all of them on the Nepal climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Purnia (India, Cwa), Malda (India, Cwa) and Siliguri (India, Cwa).
Nearby places
- Climate in Dharan 40 km · 24 °C76 °F · 1,231 mm48 in
- Climate in Purnia 78 km · 25 °C78 °F · 1,348 mm53 in
- Climate in Kishanganj 79 km · 25 °C77 °F · 1,701 mm67 in
- Climate in Lahan 84 km · 26 °C78 °F · 1,104 mm43 in
- Climate in Saharsa 93 km · 26 °C78 °F · 1,164 mm46 in
- Climate in Katihar 106 km · 26 °C78 °F · 1,229 mm48 in
- Climate in Darjiling 118 km · 13 °C56 °F · 1,545 mm61 in
- Climate in Siliguri 119 km · 25 °C77 °F · 1,774 mm70 in
Frequently asked questions
What is the warmest month in Biratnagar?
May is the warmest month in Biratnagar. Its average high is 37 °C (99 °F) and its average low is 26 °C (78 °F).
What is the coldest month in Biratnagar?
January is the coldest month. Its average high is 24 °C (74 °F) and its average low is 11 °C (52 °F).
When does it rain the most in Biratnagar?
July is the wettest month with about 379 mm (14.9 in) of precipitation. December is the driest with about 2 mm (0.1 in).
What is the best time to visit Biratnagar?
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. The gaps are largest 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.
The grid cell’s average elevation is 296 m, while Biratnagar lies at about 74 m. Temperatures on this page were therefore adjusted by +1.4 °C2.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.