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Rainfall · Uttar Pradesh

Rainfall in Unnao

889 mmof rain in an average year, 2006–2025

Unnao gets 86% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 1,007 mm, 13% above average (normal).

Julywettest month, 269 mm on average
2008wettest year, 1,390 mm
2015driest year, 537 mm
4months a year with 50 mm of rain or more

Month-wise rainfall in Unnao

Average rain in each month, 2006–2025.

0100200300JanJan: 15 mmFebFeb: 18 mmMarMar: 12 mmAprApr: 9 mmMayMay: 25 mmJunJun: 102 mmJulJul: 269 mmAugAug: 237 mmSepSep: 153 mmOctOct: 39 mmNovNov: 4 mmDecDec: 5 mm
MonthAverage rainShare of the year
January15 mm2%
February18 mm2%
March12 mm1%
April9 mm1%
May25 mm3%
June102 mm11%
July269 mm30%
August237 mm27%
September153 mm17%
October39 mm4%
November4 mm0%
December5 mm1%

Yearly rainfall in Unnao since 2006

Lighter bars are dry years, 20% or more below average (2010, 2014, 2015), when wells and borewells are drawn hardest. The last ten years averaged 15% more rain than the ten before.

05001000150020062006: 772 mm2007: 790 mm2008: 1,390 mm20092009: 870 mm2010: 681 mm2011: 904 mm20122012: 806 mm2013: 918 mm2014: 595 mm20152015: 537 mm2016: 829 mm2017: 859 mm20182018: 1,124 mm2019: 1,073 mm2020: 909 mm20212021: 1,050 mm2022: 1,022 mm2023: 863 mm20242024: 774 mm2025: 1,007 mm- - average 889 mm

What Unnao's rain is worth to a building

Every millimetre of rain on a square metre of roof is a litre of water. A 100 m² roof in Unnao sheds about 75,565 litres in an average year, most of it in four monsoon months. Sent into a recharge pit, it refills the ground instead of flooding the street.

Your building: how much can you recharge?

Water you can put back each year1,51,130 L≈ 15 water tankers of 10,000 L

1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.

Rainwater harvesting cost in UnnaoGroundwater level in UnnaoPonds and lakes in UnnaoWater quality in Unnao

Frequently asked questions

What is the average annual rainfall in Unnao?

About 889 mm a year, averaged over 2006–2025 from NASA POWER satellite and weather-model data for the centre of the district. The wettest year in that time was 2008 (1,390 mm) and the driest was 2015 (537 mm).

Which month gets the most rain in Unnao?

July, with 269 mm in an average year, followed by August and September. November is the driest month (4 mm).

How much of Unnao's rain falls in the monsoon?

86% of a normal year's rain falls from June to September. 4 months average 50 mm or more.

How much did it rain in Unnao in 2025?

1,007 mm, which is 13% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Unnao increasing or decreasing?

The last 10 years averaged 15% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Unnao harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Unnao sheds about 75,565 litres in an average year: area × rainfall × 0.85 for splash and evaporation. Sent into a recharge pit, that refills the ground under the house instead of running into the drain.

Rainfall from NASA POWER (bias-corrected satellite and weather-model rainfall) at the centre of Unnao district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.

Rainfall in other districts of Uttar Pradesh