March is close to Siwan's year-round average, with average highs near 40.2°C and lows around 11.8°C (mean 26°C). It is one of the drier months, averaging 9 mm of rainfall and 28% relative humidity across the period.
March is close to Siwan's year-round average. Across 45 years of records, the warmest Marchs in Siwan were 2010 and 2016 — when the month averaged 28.4°C — while the coldest was 1998 at 22.9°C. Typical March days reach 40.2°C with nights near 11.8°C. The long-term trend is warming, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.4°C | 26.1°C | 25.9°C | 26.2°C | 26.4°C | +1°C |
| Avg High | 40.1°C | 40.3°C | 40.0°C | 40.5°C | 39.9°C | -0.2°C |
| Avg Low | 10.8°C | 11.9°C | 11.8°C | 11.8°C | 12.8°C | +2°C |
| Avg Rain | 13 mm | 6 mm | 8 mm | 9 mm | 13 mm | +0 mm |
March temperatures in Siwan have risen by about 1.1°C between 1981–1985 and 2021–2025.
March has ranged from a record low of 8.6°C (2019) to a record high of 43.3°C (2004).
Rainfall in March is one of the drier months, averaging 9 mm, with a wettest year of 45 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Siwan
March is one of the best times to visit Siwan. Expect days averaging 40.2°C and nights around 11.8°C (mean 26°C) — close to Siwan's yearly average — with low rainfall (9 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 42.4°C | 12.9°C | 27.7°C | 3 mm | 23% | 2.3 m/s | 5.7 |
| 2024 | 40.6°C | 10.6°C | 25.6°C | 25 mm | 34% | 2.2 m/s | 5.3 |
| 2023 | 36.9°C | 15.8°C | 26.3°C | 17 mm | 39% | 1.9 m/s | 5 |
| 2022 | 39.7°C | 12.4°C | 26.0°C | 0 mm | 39% | 1.9 m/s | 5.6 |
| 2021 | 41.8°C | 12.4°C | 27.1°C | 0 mm | 22% | 2.4 m/s | 5.5 |
| 2020 | 38.0°C | 12.9°C | 25.5°C | 32 mm | 49% | 2.3 m/s | 5.3 |
| 2019 | 40.9°C | 8.6°C | 24.7°C | 7 mm | 31% | 2.2 m/s | 5.6 |
| 2018 | 39.7°C | 15.1°C | 27.4°C | 2 mm | 20% | 2.2 m/s | 5.8 |
| 2017 | 42.8°C | 11.0°C | 26.9°C | 8 mm | 28% | 1.9 m/s | 5.5 |
| 2016 | 40.9°C | 16.0°C | 28.4°C | 10 mm | 25% | 2.2 m/s | 5.5 |
| 2015 | 38.7°C | 11.1°C | 24.9°C | 32 mm | 43% | 2.2 m/s | 5.3 |
| 2014 | 40.1°C | 9.5°C | 24.8°C | 9 mm | 40% | 2.1 m/s | 5.8 |
| 2013 | 39.2°C | 10.2°C | 24.7°C | 2 mm | 35% | 2.2 m/s | 5.9 |
| 2012 | 40.2°C | 11.7°C | 26.0°C | 10 mm | 26% | 2.1 m/s | 5.9 |
| 2011 | 40.2°C | 10.8°C | 25.5°C | 9 mm | 28% | 2.1 m/s | 5.7 |
| 2010 🔥 | 42.5°C | 14.3°C | 28.4°C | 0 mm | 22% | 2.4 m/s | 5.9 |
| 2009 | 38.5°C | 10.6°C | 24.5°C | 1 mm | 26% | 1.8 m/s | 5.7 |
| 2008 | 38.9°C | 12.3°C | 25.6°C | 3 mm | 34% | 1.7 m/s | 5.5 |
| 2007 | 38.9°C | 10.5°C | 24.7°C | 36 mm | 42% | 1.9 m/s | 5.8 |
| 2006 | 40.5°C | 13.3°C | 26.9°C | 15 mm | 30% | 2.1 m/s | 5.7 |
| 2005 | 40.2°C | 15.6°C | 27.9°C | 10 mm | 34% | 2.2 m/s | 5.7 |
| 2004 | 43.3°C | 11.3°C | 27.3°C | 3 mm | 24% | 2.1 m/s | 5.9 |
| 2003 | 39.2°C | 8.7°C | 23.9°C | 1 mm | 31% | 1.8 m/s | 5.7 |
| 2002 | 39.5°C | 12.0°C | 25.8°C | 7 mm | 28% | 1.7 m/s | 5.9 |
| 2001 | 40.3°C | 12.1°C | 26.2°C | 3 mm | 17% | 2.1 m/s | 5.9 |
| 2000 | 40.6°C | 11.8°C | 26.2°C | 3 mm | 17% | 1.9 m/s | 5.9 |
| 1999 | 41.8°C | 12.0°C | 26.9°C | 0 mm | 14% | 2.7 m/s | 6.2 |
| 1998 ❄️ | 36.8°C | 9.1°C | 22.9°C | 13 mm | 37% | 2.3 m/s | 5.5 |
| 1997 | 38.2°C | 13.2°C | 25.7°C | 1 mm | 18% | 2.3 m/s | 5.6 |
| 1996 | 41.4°C | 14.7°C | 28.0°C | 0 mm | 31% | 2.5 m/s | 6 |
| 1995 | 41.6°C | 12.7°C | 27.2°C | 4 mm | 25% | 2.5 m/s | 5.6 |
| 1994 | 41.7°C | 10.3°C | 26.0°C | 0 mm | 21% | 2.2 m/s | 6.6 |
| 1993 | 37.9°C | 11.1°C | 24.5°C | 30 mm | 29% | 2.4 m/s | 5.8 |
| 1992 | 42.2°C | 12.4°C | 27.3°C | 0 mm | 18% | 3.5 m/s | 6.3 |
| 1991 | 41.8°C | 13.4°C | 27.6°C | 3 mm | 19% | 1.9 m/s | 6.1 |
| 1990 | 40.0°C | 10.3°C | 25.2°C | 5 mm | 27% | 1.8 m/s | 6.3 |
| 1989 | 40.6°C | 10.1°C | 25.4°C | 8 mm | 25% | 2.6 m/s | 6 |
| 1988 | 38.7°C | 9.7°C | 24.2°C | 39 mm | 33% | 2.1 m/s | 5.8 |
| 1987 | 40.1°C | 12.1°C | 26.1°C | 6 mm | 24% | 2.1 m/s | 6.1 |
| 1986 | 42.3°C | 10.7°C | 26.5°C | 1 mm | 30% | 2.2 m/s | 6.5 |
| 1985 | 41.7°C | 12.8°C | 27.2°C | 0 mm | 13% | 2.5 m/s | 6.7 |
| 1984 | 43.0°C | 8.9°C | 26.0°C | 1 mm | 21% | 2.3 m/s | 6.4 |
| 1983 | 39.7°C | 11.5°C | 25.6°C | 1 mm | 17% | 2.6 m/s | — |
| 1982 🌧️ | 37.6°C | 9.4°C | 23.5°C | 45 mm | 46% | 1.9 m/s | — |
| 1981 | 37.4°C | 11.6°C | 24.5°C | 13 mm | 36% | 1.9 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 40.2°C with lows near 11.8°C (mean 26°C), based on 45 years of NASA POWER data.
March averages 9 mm of rainfall in Siwan, one of the drier months. The wettest on record was 45 mm in 1982.
The hottest March reached 43.3°C in 2004. The coldest dipped to 8.6°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 1.1°C. Daytime highs moved from 39.9°C to 40.3°C and overnight lows from 10.8°C to 12.8°C over the same span.
March is close to Siwan's year-round average and one of the drier months, so plan for around 40.2°C daytime highs and 11.8°C at night.
Not quite — March is the 6th coolest month in Siwan, averaging 26°C.
For March in Siwan, pack light, breathable clothing and sun protection, with typical highs of 40.2°C and lows of 11.8°C.
Relative humidity in March averages 28% — relatively dry.
Average wind speed in March is 2.2 m/s. The windiest March on record averaged 3.5 m/s (1992).
The wettest March on record was 1982 with 45 mm. On average, March sees 9 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 Siwan behaves each March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
