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Monthly climate in Siwan, Bihar, India

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Siwan features a humid subtropical climate (Cwa).Temperatures typically range between 15 °C (59 °F) and 32 °C (89 °F) through the year, but rarely can drop to 4 °C (40 °F) or can rise to as high as 45 °C (114 °F).The average annual precipitation amounts to about 1397 mm (55.0 inches) and receives 115 rainy days on the 1 mm (0.04 inches) threshold annually.Siwan enjoys an average of 3521 hours of sunshine throughout the year, and daylight varies from 10 hours 30 minutes to 13 hours 44 minutes per day.

Monthly average temperatures in Siwan, Bihar, India §

The warmest months in Siwan are April, May and June, with daily mean temperatures ranging from 30 to 32 °C (87 - 89 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 15 to 19 °C (59 - 66 °F) throughout the day. On average each year, Siwan experiences 274 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Siwan, Bihar, India.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 29°C
(84°F)		 33°C
(91°F)		 39°C
(103°F)		 42°C
(108°F)		 43°C
(110°F)		 45°C
(114°F)		 40°C
(104°F)		 37°C
(98°F)		 36°C
(98°F)		 36°C
(97°F)		 33°C
(92°F)		 29°C
(85°F)
Mean maximum 26°C
(79°F)		 31°C
(87°F)		 37°C
(99°F)		 41°C
(106°F)		 42°C
(108°F)		 41°C
(105°F)		 38°C
(100°F)		 36°C
(97°F)		 36°C
(97°F)		 35°C
(96°F)		 32°C
(91°F)		 28°C
(83°F)
Average high 21°C
(71°F)		 26°C
(79°F)		 32°C
(91°F)		 38°C
(100°F)		 37°C
(99°F)		 36°C
(97°F)		 33°C
(92°F)		 33°C
(92°F)		 33°C
(92°F)		 33°C
(91°F)		 29°C
(85°F)		 24°C
(76°F)
Daily mean 15°C
(59°F)		 19°C
(66°F)		 25°C
(77°F)		 30°C
(87°F)		 31°C
(89°F)		 32°C
(89°F)		 30°C
(86°F)		 30°C
(86°F)		 29°C
(85°F)		 27°C
(81°F)		 22°C
(72°F)		 17°C
(63°F)
Average low 10°C
(51°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(75°F)		 26°C
(79°F)		 28°C
(82°F)		 27°C
(82°F)		 27°C
(82°F)		 27°C
(80°F)		 23°C
(74°F)		 17°C
(62°F)		 12°C
(54°F)
Mean minimum 6°C
(43°F)		 9°C
(48°F)		 13°C
(56°F)		 20°C
(68°F)		 23°C
(73°F)		 26°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 25°C
(77°F)		 18°C
(65°F)		 12°C
(55°F)		 7°C
(45°F)
Minimum 4°C
(40°F)		 7°C
(45°F)		 9°C
(48°F)		 18°C
(64°F)		 21°C
(69°F)		 24°C
(75°F)		 25°C
(78°F)		 26°C
(79°F)		 23°C
(73°F)		 17°C
(62°F)		 11°C
(52°F)		 5°C
(41°F)

Compare climate in Siwan with other places

Compare temperature, precipitation, sunshine, UV index in Siwan, Bihar, India with other places around the world.

Monthly average precipitation in Siwan, Bihar, India §

Siwan usually has the most precipitation in July, August and September, with an average of 26 rainy days and 342 mm (13.5 inches) of precipitation per month.The driest months in Siwan are January, February and November. On average, 7 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Siwan, Bihar, India.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 10 (0.4) 10 (0.4) 10 (0.4) 14 (0.5) 69 (2.7) 183 (7.2) 439 (17.3) 337 (13.3) 250 (9.8) 56 (2.2) 0 (0.0) 21 (0.8)
Average precipitation days (≥ 1 mm) 2 2 2 3 6 16 28 28 22 6 0 0

Monthly sunshine hours in Siwan, Bihar, India §

The sunniest months in Siwan are March, April and May, when the sun shines an average of 11 hours 13 minutes a day.Least sunny months in Siwan: January, July and September receive an average of 8 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Siwan, Bihar, India.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 230 277 335 342 353 318 255 272 269 307 281 276
Mean daily daylight hours 10h 41m 11h 15m 12h 0m 12h 46m 13h 25m 13h 44m 13h 34m 13h 0m 12h 16m 11h 30m 10h 51m 10h 30m

Solar UV radiation in Siwan, Bihar, India §

Siwan experiences the highest level of ultraviolet (UV) radiation in July, August and September, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure.January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Siwan UV Index data.

Average daily maximum UV levels by month for Siwan, Bihar, India.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 5 6 8 10 10 10 12 11 11 9 6 5