September is one of the warmer months of the year in Katihar, with average highs near 34°C and lows around 22.9°C (mean 28.5°C). It is a relatively wet time of year, averaging 188 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Katihar. Across 45 years of records, the warmest September in Katihar was 1989 — when the month averaged 31°C — while the coldest was 1984 at 25.6°C. Typical September days reach 34°C with nights near 22.9°C. The long-term September temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.4°C | 28.8°C | 28.0°C | 28.3°C | 28.9°C | +0.5°C |
| Avg High | 34.5°C | 35.2°C | 33.1°C | 33.5°C | 33.6°C | -0.9°C |
| Avg Low | 22.3°C | 22.5°C | 23.0°C | 23.1°C | 24.2°C | +1.9°C |
| Avg Rain | 153 mm | 128 mm | 202 mm | 212 mm | 280 mm | +127 mm |
September temperatures in Katihar have risen by about 1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 19.5°C (1984) to a record high of 38.7°C (1992).
Rainfall in September is a relatively wet time of year, averaging 188 mm, with a wettest year of 460 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.4°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Katihar
September is a good time to visit Katihar, with days averaging 34°C and nights around 22.9°C (mean 28.5°C, warmer than Katihar's yearly average) and higher rainfall. November and February are marginally more temperate, but September still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 33.2°C | 24.6°C | 28.9°C | 193 mm | 86% | 1.4 m/s | 4.6 |
| 2024 | 34.8°C | 24.1°C | 29.4°C | 313 mm | 87% | 2.1 m/s | 4.7 |
| 2023 | 33.8°C | 24.8°C | 29.3°C | 373 mm | 88% | 1.8 m/s | 4.2 |
| 2022 | 33.3°C | 23.7°C | 28.5°C | 238 mm | 87% | 1.8 m/s | 4 |
| 2021 | 32.7°C | 24.2°C | 28.4°C | 105 mm | 89% | 1.9 m/s | 4.7 |
| 2020 🌧️ | 33.5°C | 23.8°C | 28.7°C | 460 mm | 88% | 1.5 m/s | 3.5 |
| 2019 | 33.6°C | 22.7°C | 28.1°C | 400 mm | 88% | 1.9 m/s | 3.8 |
| 2018 | 33.1°C | 23.4°C | 28.2°C | 130 mm | 85% | 1.9 m/s | 4.8 |
| 2017 | 33.5°C | 24.9°C | 29.2°C | 144 mm | 88% | 1.7 m/s | 4.5 |
| 2016 | 32.5°C | 24.6°C | 28.5°C | 365 mm | 88% | 1.5 m/s | 4.2 |
| 2015 | 34.1°C | 22.0°C | 28.1°C | 184 mm | 84% | 1.7 m/s | 4.9 |
| 2014 | 33.9°C | 23.0°C | 28.5°C | 178 mm | 86% | 1.7 m/s | 4.5 |
| 2013 | 33.9°C | 23.3°C | 28.6°C | 100 mm | 83% | 1.8 m/s | 4.9 |
| 2012 | 34.2°C | 21.8°C | 28.0°C | 197 mm | 86% | 2.1 m/s | 4.5 |
| 2011 | 33.3°C | 22.7°C | 28.0°C | 218 mm | 89% | 2.5 m/s | 4.5 |
| 2010 | 32.7°C | 22.2°C | 27.4°C | 205 mm | 87% | 1.8 m/s | 4.7 |
| 2009 | 32.9°C | 23.3°C | 28.1°C | 125 mm | 87% | 1.9 m/s | 4.9 |
| 2008 | 32.8°C | 22.8°C | 27.8°C | 145 mm | 86% | 1.7 m/s | 4.8 |
| 2007 | 32.3°C | 22.7°C | 27.5°C | 270 mm | 88% | 2.1 m/s | 4.1 |
| 2006 | 34.4°C | 23.1°C | 28.7°C | 366 mm | 86% | 2.3 m/s | 4.4 |
| 2005 | 33.4°C | 23.9°C | 28.7°C | 127 mm | 86% | 1.6 m/s | 4.9 |
| 2004 | 32.7°C | 22.7°C | 27.7°C | 159 mm | 89% | 2 m/s | 4.2 |
| 2003 | 33.7°C | 23.5°C | 28.6°C | 146 mm | 84% | 2.3 m/s | 4.5 |
| 2002 | 32.7°C | 22.0°C | 27.3°C | 229 mm | 87% | 2.1 m/s | 4.8 |
| 2001 | 32.6°C | 24.1°C | 28.4°C | 247 mm | 86% | 1.6 m/s | 4.4 |
| 2000 | 33.1°C | 22.0°C | 27.6°C | 206 mm | 87% | 2.2 m/s | 4.1 |
| 1999 | 31.9°C | 22.5°C | 27.2°C | 128 mm | 90% | 2.4 m/s | 4.2 |
| 1998 | 33.3°C | 23.5°C | 28.4°C | 175 mm | 87% | 1.8 m/s | 4.5 |
| 1997 | 32.8°C | 20.4°C | 26.6°C | 176 mm | 86% | 1.7 m/s | 4.7 |
| 1996 | 36.0°C | 23.6°C | 29.8°C | 77 mm | 76% | 1.5 m/s | 4.7 |
| 1995 | 34.9°C | 22.7°C | 28.8°C | 102 mm | 82% | 2.7 m/s | 4.6 |
| 1994 | 36.9°C | 19.5°C | 28.2°C | 69 mm | 68% | 2.4 m/s | 5.1 |
| 1993 | 37.5°C | 23.8°C | 30.6°C | 134 mm | 76% | 2.4 m/s | 4.3 |
| 1992 | 38.7°C | 22.0°C | 30.4°C | 62 mm | 66% | 2.3 m/s | 4.9 |
| 1991 | 32.9°C | 23.1°C | 28.0°C | 231 mm | 87% | 1.9 m/s | 4.1 |
| 1990 | 36.6°C | 23.7°C | 30.2°C | 124 mm | 79% | 2 m/s | 4.3 |
| 1989 🔥 | 37.8°C | 24.3°C | 31.0°C | 146 mm | 76% | 2.3 m/s | 4.1 |
| 1988 | 35.9°C | 22.9°C | 29.4°C | 64 mm | 79% | 1.8 m/s | 5 |
| 1987 | 33.1°C | 22.0°C | 27.6°C | 186 mm | 87% | 1.9 m/s | 4.6 |
| 1986 | 34.6°C | 22.0°C | 28.3°C | 187 mm | 82% | 2.4 m/s | 4.5 |
| 1985 | 34.7°C | 23.4°C | 29.1°C | 161 mm | 82% | 1.6 m/s | 5 |
| 1984 ❄️ | 31.7°C | 19.5°C | 25.6°C | 220 mm | 86% | 1.8 m/s | 4.5 |
| 1983 | 34.8°C | 24.3°C | 29.6°C | 115 mm | 80% | 2.3 m/s | — |
| 1982 | 34.3°C | 20.2°C | 27.3°C | 141 mm | 81% | 1.8 m/s | — |
| 1981 | 33.3°C | 22.5°C | 27.9°C | 160 mm | 87% | 1.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34°C with lows near 22.9°C (mean 28.5°C), based on 45 years of NASA POWER data.
September averages 188 mm of rainfall in Katihar, a relatively wet time of year. The wettest on record was 460 mm in 2020.
The hottest September reached 38.7°C in 1992. The coldest dipped to 19.5°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1°C. Daytime highs moved from 33.8°C to 33.6°C and overnight lows from 22°C to 24.3°C over the same span.
September is one of the warmer months of the year in Katihar and a relatively wet time of year, so plan for around 34°C daytime highs and 22.9°C at night.
Not quite — September is the 7th coolest month in Katihar, averaging 28.5°C.
For September in Katihar, pack light, breathable clothing and sun protection, with typical highs of 34°C and lows of 22.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 1.9 m/s. The windiest September on record averaged 2.7 m/s (1995).
The wettest September on record was 2020 with 460 mm. On average, September sees 188 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 Katihar behaves each September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
