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Arrah, Bihar Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Arrah, Bihar?
Arrah, Bihar gets 935 mm of precipitation a year over about 62 rainy days. May is the warmest month (average high 38°C) and January the coldest (average low 9°C).
Subtropical monsoon climate
Arrah, Bihar has hot summers and warm winters. Daytime highs range from about 22°C in January to 38°C in May. July is usually the wettest month. The most comfortable time to visit is typically January to February and December, when daytime highs sit near 24°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 11° | 24° |
| Spring | Mar–May | 22° | 36° |
| Summer | Jun–Aug | 27° | 34° |
| Autumn | Sep–Nov | 21° | 31° |
How much rain does Arrah get?
Arrah gets 935 mm of precipitation in an average year, spread over about 62 days with measurable rain. That is more rainy days than 56% of India.
July is the wettest month, with 249 mm. March is the driest, with 5 mm. July has the most rainy days, about 15.
Arrah weather by month
Arrah weather in January
In January, Arrah averages a high of 22°C and a low of 9°C. It gets 11 mm of precipitation over about 2 rainy days. Estimated sunshine is 69% of daylight hours, derived from ERA5 cloud cover. The January record high is 29°C (2008) and the record low is 0°C (1975). January is one of the most comfortable months to visit.
Arrah weather in February
In February, Arrah averages a high of 27°C and a low of 12°C. It gets 15 mm of precipitation over about 2 rainy days. Estimated sunshine is 83% of daylight hours, derived from ERA5 cloud cover. The February record high is 39°C (1991) and the record low is 3°C (1974). February is one of the most comfortable months to visit.
Arrah weather in March
In March, Arrah averages a high of 33°C and a low of 17°C. It gets 5 mm of precipitation over about 2 rainy days. Estimated sunshine is 81% of daylight hours, derived from ERA5 cloud cover. The March record high is 42°C (2010) and the record low is 8°C (1979).
Arrah weather in April
In April, Arrah averages a high of 37°C and a low of 22°C. It gets 13 mm of precipitation over about 2 rainy days. Estimated sunshine is 74% of daylight hours, derived from ERA5 cloud cover. The April record high is 45°C (1980) and the record low is 15°C (1983).
Arrah weather in May
In May, Arrah averages a high of 38°C and a low of 25°C. It gets 35 mm of precipitation over about 4 rainy days. Estimated sunshine is 72% of daylight hours, derived from ERA5 cloud cover. The May record high is 46°C (2005) and the record low is 18°C (1980).
Arrah weather in June
In June, Arrah averages a high of 37°C and a low of 27°C. It gets 147 mm of precipitation over about 8 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The June record high is 46°C (1995) and the record low is 19°C (1996).
Arrah weather in July
In July, Arrah averages a high of 34°C and a low of 27°C. It gets 249 mm of precipitation over about 15 rainy days. Estimated sunshine is 13% of daylight hours, derived from ERA5 cloud cover. The July record high is 40°C (1992) and the record low is 20°C (1977).
Arrah weather in August
In August, Arrah averages a high of 33°C and a low of 26°C. It gets 201 mm of precipitation over about 14 rainy days. Estimated sunshine is 17% of daylight hours, derived from ERA5 cloud cover. The August record high is 40°C (2002) and the record low is 22°C (1987).
Arrah weather in September
In September, Arrah averages a high of 33°C and a low of 26°C. It gets 201 mm of precipitation over about 10 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The September record high is 39°C (1980) and the record low is 20°C (1986).
Arrah weather in October
In October, Arrah averages a high of 32°C and a low of 22°C. It gets 31 mm of precipitation over about 3 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The October record high is 39°C (1994) and the record low is 14°C (1983).
Arrah weather in November
In November, Arrah averages a high of 29°C and a low of 16°C. It gets 19 mm of precipitation over about 1 rainy days. Estimated sunshine is 82% of daylight hours, derived from ERA5 cloud cover. The November record high is 35°C (1990) and the record low is 8°C (1975).
Arrah weather in December
In December, Arrah averages a high of 24°C and a low of 11°C. It gets 10 mm of precipitation over about 1 rainy days. Estimated sunshine is 80% of daylight hours, derived from ERA5 cloud cover. The December record high is 34°C (2014) and the record low is 4°C (1998). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in Arrah
February is the sunniest month in Arrah, with estimated sunshine of 83% of daylight hours from ERA5 cloud cover. July is the cloudiest, at 13%. The annual cloud-cover estimate is 58% of daylight hours; it is not a measurement of sunshine duration. Arrah is sunnier than 71% of India.
Humidity peaks in September at 84% and is lowest in April at 42%.
Arrah has about 123 days a year above 32°C. Arrah is hotter than 51% of India.
Arrah weather records
These records cover PATNA during 1970–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Arrah station is 46°C, on June 15, 1995. The coldest is 0°C, on January 28, 1975.
The wettest day in the available station history brought 462 mm of precipitation, on September 4, 1991.
16 all-time records have been set at the station since 1970.
The best time to visit Arrah
The most comfortable time to visit is typically January to February and December, when daytime highs sit near 24°C.
Winter (December–February) is warm, with average highs around 24°C and lows near 11°C.
Spring (March–May) is hot, with average highs around 36°C and lows near 21°C.
Summer (June–August) is hot, with average highs around 34°C and lows near 27°C. It can feel humid.
Autumn (September–November) is hot, with average highs around 31°C and lows near 21°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 9° | 22° | 11 mm | 2 | 80% | 69% | 29° | 0° |
| February | 12° | 27° | 15 mm | 2 | 69% | 83% | 39° | 3° |
| March | 17° | 33° | 5.1 mm | 2 | 58% | 81% | 42° | 8° |
| April | 22° | 37° | 13 mm | 2 | 42% | 74% | 45° | 15° |
| May | 25° | 38° | 35 mm | 4 | 58% | 72% | 46° | 18° |
| June | 27° | 37° | 147 mm | 8 | 65% | 40% | 46° | 19° |
| July | 27° | 34° | 249 mm | 15 | 80% | 13% | 40° | 20° |
| August | 26° | 33° | 201 mm | 14 | 82% | 17% | 40° | 22° |
| September | 26° | 33° | 201 mm | 10 | 84% | 21% | 39° | 20° |
| October | 22° | 32° | 31 mm | 3 | 79% | 65% | 39° | 14° |
| November | 16° | 29° | 19 mm | 1 | 71% | 82% | 35° | 8° |
| December | 11° | 24° | 9.7 mm | 1 | 74% | 80% | 34° | 4° |
Station: PATNA, 44 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Arrah climate questions
How much rain does Arrah get?
Arrah gets 935 mm of precipitation in an average year, over about 62 rainy days.
What is the wettest month in Arrah?
July is the wettest month in Arrah, with 249 mm. March is the driest, with 5 mm.
How many rainy days does Arrah have a year?
Arrah has about 62 days with measurable rain in an average year. July has the most, about 15.
What is the hottest month in Arrah?
May is the warmest month in Arrah, with an average high of 38°C.
What is the coldest month in Arrah?
January is the coldest month in Arrah, with an average low of 9°C.
What is the record high temperature in Arrah?
Within the available 1970–2025 station history, the record high at the Arrah station is 46°C, set on June 15, 1995. The record low is 0°C, on January 28, 1975.
What is the sunniest month in Arrah?
February is the sunniest month in Arrah, with estimated sunshine of 83% of daylight hours from ERA5 cloud cover. July is the cloudiest.
What is the best time to visit Arrah?
The most comfortable time to visit is typically January to February and December, when daytime highs sit near 24°C.