May is one of the warmer months of the year in Sitamarhi, with average highs near 40.3°C and lows around 26.6°C (mean 33.5°C). It is one of the drier months, averaging 66 mm of rainfall and 37% relative humidity across the period.
May is one of the warmer months of the year in Sitamarhi. Across 45 years of records, the warmest May in Sitamarhi was 1995 — when the month averaged 35.9°C — while the coldest was 2021 at 30.7°C. Typical May days reach 40.3°C with nights near 26.6°C. The long-term trend is cooling, about 0.4°C per decade.
May is one of the drier months in Sitamarhi, averaging 66 mm of rainfall. The wettest May on record was 2021 with 308 mm, while the driest was 1995 at 4 mm.
Relative humidity in Sitamarhi during May averages 37%. The most humid May was 2021 at 52%, and the least humid was 1996 at 21%.
May receives about 6.4 kWh/m²/day of solar energy in Sitamarhi. The sunniest Mays were 1985 and 1993 at 7.3 kWh/m²/day, and the cloudiest was 2021 at 4.5.
Average wind speed in Sitamarhi during May is 2.4 m/s. The windiest Mays were 1984 and 1989 at 3.3 m/s, while the calmest was 2013 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 33.4°C | 34.7°C | 33.2°C | 33.5°C | 31.9°C | -1.5°C |
| Avg High | 40.8°C | 42.0°C | 39.7°C | 40.3°C | 38.0°C | -2.8°C |
| Avg Low | 25.9°C | 27.3°C | 26.8°C | 26.8°C | 25.7°C | -0.2°C |
| Avg Rain | 44 mm | 26 mm | 71 mm | 82 mm | 130 mm | +86 mm |
May temperatures in Sitamarhi have fallen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 19.3°C (2004) to a record high of 47.4°C (1998).
Rainfall in May is one of the drier months, averaging 66 mm, with a wettest year of 308 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.7°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A quieter season to visit Sitamarhi
If your dates are flexible, the more temperate months of November and February tend to be the most comfortable for visiting Sitamarhi. That said, May — with days averaging 40.3°C and nights around 26.6°C (mean 33.5°C) and moderate rainfall (66 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 37.9°C | 32.1°C | 26.2°C | 42.5°C | 23.8°C | 59 mm | 49% | 2.6 m/s | 5.6 |
| 2024 | 39.1°C | 32.9°C | 26.6°C | 45.2°C | 22.3°C | 103 mm | 43% | 2.7 m/s | 5.7 |
| 2023 | 39.0°C | 32.1°C | 25.2°C | 43.4°C | 22.4°C | 61 mm | 38% | 2.1 m/s | 6.3 |
| 2022 | 37.5°C | 31.7°C | 25.9°C | 41.0°C | 23.3°C | 161 mm | 52% | 1.9 m/s | 5.8 |
| 2021 ❄️ 🌧️ | 36.5°C | 30.7°C | 24.9°C | 41.6°C | 22.0°C | 308 mm | 52% | 2.4 m/s | 4.5 |
| 2020 | 38.1°C | 31.8°C | 25.4°C | 44.3°C | 22.1°C | 87 mm | 48% | 2.2 m/s | 5.9 |
| 2019 | 42.5°C | 34.7°C | 26.9°C | 45.7°C | 21.2°C | 32 mm | 30% | 2.6 m/s | 6.6 |
| 2018 | 38.5°C | 32.4°C | 26.3°C | 42.3°C | 23.7°C | 62 mm | 48% | 2.7 m/s | 5.9 |
| 2017 | 39.4°C | 33.3°C | 27.2°C | 43.1°C | 23.1°C | 137 mm | 45% | 2.2 m/s | 5.9 |
| 2016 | 39.8°C | 33.5°C | 27.2°C | 43.3°C | 25.3°C | 117 mm | 41% | 2.1 m/s | 5.7 |
| 2015 | 41.0°C | 33.8°C | 26.7°C | 44.5°C | 23.2°C | 48 mm | 36% | 1.9 m/s | 6.3 |
| 2014 | 40.7°C | 33.7°C | 26.8°C | 45.2°C | 24.0°C | 110 mm | 35% | 2.6 m/s | 6.5 |
| 2013 | 39.5°C | 32.2°C | 25.0°C | 43.7°C | 22.9°C | 102 mm | 34% | 1.8 m/s | 5.9 |
| 2012 | 42.7°C | 35.4°C | 28.1°C | 46.2°C | 23.9°C | 14 mm | 25% | 2.3 m/s | 6.7 |
| 2011 | 38.8°C | 32.6°C | 26.3°C | 42.1°C | 23.6°C | 114 mm | 46% | 2.3 m/s | 6.3 |
| 2010 | 40.0°C | 33.6°C | 27.2°C | 44.4°C | 24.4°C | 84 mm | 42% | 2.5 m/s | 6.3 |
| 2009 | 39.2°C | 33.0°C | 26.8°C | 44.4°C | 24.4°C | 74 mm | 43% | 2.8 m/s | 6 |
| 2008 | 39.2°C | 33.1°C | 27.0°C | 41.9°C | 24.9°C | 106 mm | 41% | 1.9 m/s | 6.2 |
| 2007 | 39.5°C | 33.0°C | 26.5°C | 43.3°C | 24.2°C | 77 mm | 43% | 2.2 m/s | 6.8 |
| 2006 | 39.2°C | 33.4°C | 27.6°C | 42.9°C | 25.2°C | 79 mm | 45% | 2.3 m/s | 6.1 |
| 2005 | 40.4°C | 33.2°C | 25.9°C | 45.5°C | 21.5°C | 25 mm | 33% | 2.2 m/s | 6.7 |
| 2004 | 39.8°C | 32.9°C | 26.1°C | 43.5°C | 19.3°C | 70 mm | 39% | 2.1 m/s | 6.6 |
| 2003 | 40.9°C | 33.6°C | 26.3°C | 44.8°C | 21.3°C | 12 mm | 29% | 2.5 m/s | 6.6 |
| 2002 | 38.3°C | 32.2°C | 26.1°C | 43.7°C | 23.5°C | 125 mm | 49% | 2.9 m/s | 5.9 |
| 2001 | 40.2°C | 34.1°C | 28.0°C | 43.3°C | 24.8°C | 70 mm | 41% | 2.6 m/s | 6.4 |
| 2000 | 39.8°C | 33.7°C | 27.6°C | 44.9°C | 22.7°C | 70 mm | 43% | 2.5 m/s | 6 |
| 1999 | 40.2°C | 33.7°C | 27.1°C | 45.3°C | 22.3°C | 59 mm | 40% | 2.3 m/s | 6.5 |
| 1998 | 41.8°C | 34.7°C | 27.7°C | 47.4°C | 23.7°C | 24 mm | 35% | 2.8 m/s | 6.7 |
| 1997 | 42.3°C | 34.2°C | 26.2°C | 45.3°C | 20.4°C | 27 mm | 22% | 2.5 m/s | 6.6 |
| 1996 | 43.7°C | 35.6°C | 27.5°C | 46.2°C | 24.3°C | 5 mm | 21% | 2.2 m/s | 6.9 |
| 1995 🔥 | 43.7°C | 35.9°C | 28.1°C | 46.2°C | 25.1°C | 4 mm | 23% | 2.6 m/s | 7.2 |
| 1994 | 42.1°C | 34.8°C | 27.4°C | 45.1°C | 22.9°C | 32 mm | 28% | 2.5 m/s | 6.6 |
| 1993 | 41.0°C | 33.9°C | 26.9°C | 46.5°C | 24.3°C | 35 mm | 31% | 2.2 m/s | 7.3 |
| 1992 | 40.5°C | 33.1°C | 25.6°C | 45.0°C | 22.1°C | 45 mm | 30% | 2.6 m/s | 6.5 |
| 1991 | 43.6°C | 35.8°C | 28.0°C | 46.6°C | 24.5°C | 10 mm | 23% | 2.6 m/s | 7 |
| 1990 | 41.4°C | 34.9°C | 28.5°C | 45.4°C | 25.2°C | 16 mm | 33% | 2.4 m/s | 6.2 |
| 1989 | 41.4°C | 34.0°C | 26.7°C | 46.1°C | 20.2°C | 45 mm | 32% | 3.3 m/s | 7.2 |
| 1988 | 41.2°C | 33.6°C | 26.0°C | 46.1°C | 22.2°C | 49 mm | 37% | 2.7 m/s | 7.2 |
| 1987 | 40.9°C | 33.2°C | 25.5°C | 45.4°C | 20.0°C | 19 mm | 28% | 2.2 m/s | 7 |
| 1986 | 39.3°C | 31.9°C | 24.5°C | 41.9°C | 20.4°C | 52 mm | 34% | 2.4 m/s | 6.8 |
| 1985 | 41.6°C | 34.1°C | 26.5°C | 44.5°C | 23.7°C | 23 mm | 29% | 2.4 m/s | 7.3 |
| 1984 | 41.3°C | 33.8°C | 26.2°C | 46.6°C | 22.6°C | 27 mm | 35% | 3.3 m/s | 6.6 |
| 1983 | 41.0°C | 33.6°C | 26.2°C | 44.2°C | 23.9°C | 18 mm | 30% | 2.2 m/s | — |
| 1982 | 40.9°C | 33.3°C | 25.6°C | 43.8°C | 20.3°C | 53 mm | 31% | 1.9 m/s | — |
| 1981 | 39.5°C | 32.8°C | 26.1°C | 42.0°C | 24.2°C | 107 mm | 44% | 2.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 40.3°C with lows near 26.6°C (mean 33.5°C), based on 45 years of NASA POWER data.
May averages 66 mm of rainfall in Sitamarhi, one of the drier months. The wettest on record was 308 mm in 2021.
The hottest May reached 47.4°C in 1998. The coldest dipped to 19.3°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 1.6°C. Daytime highs moved from 40.9°C to 38°C and overnight lows from 26.1°C to 25.8°C over the same span.
May is one of the warmer months of the year in Sitamarhi and one of the drier months, so plan for around 40.3°C daytime highs and 26.6°C at night.
Not quite — May is the 11th coolest month in Sitamarhi, averaging 33.5°C.
For May in Sitamarhi, pack light, breathable clothing and sun protection, with typical highs of 40.3°C and lows of 26.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 37% — relatively dry.
Average wind speed in May is 2.4 m/s. The windiest May on record averaged 3.3 m/s (1984).
The wettest May on record was 2021 with 308 mm. On average, May sees 66 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Sitamarhi behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
