October is one of the cooler months of the year in Siwan, with average highs near 33.2°C and lows around 15.6°C (mean 24.4°C). It is one of the drier months, averaging 48 mm of rainfall and 72% relative humidity across the period.
October is one of the cooler months of the year in Siwan. Across 45 years of records, the warmest Octobers in Siwan were 2015 and 2024 — when the month averaged 26.7°C — while the coldest was 1996 at 21.8°C. Typical October days reach 33.2°C with nights near 15.6°C. The long-term trend is warming, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.2°C | 23.6°C | 24.8°C | 24.4°C | 25.1°C | +0.9°C |
| Avg High | 33.3°C | 32.9°C | 33.3°C | 33.1°C | 33.3°C | 0°C |
| Avg Low | 15.0°C | 14.3°C | 16.3°C | 15.7°C | 17.0°C | +2°C |
| Avg Rain | 43 mm | 32 mm | 46 mm | 43 mm | 94 mm | +51 mm |
October temperatures in Siwan have risen by about 1.4°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 12.2°C (1990) to a record high of 36.7°C (2015).
Rainfall in October is one of the drier months, averaging 48 mm, with a wettest year of 244 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
One of the best times to visit Siwan
October is one of the best times to visit Siwan. Expect days averaging 33.2°C and nights around 15.6°C (mean 24.4°C) — cooler than Siwan's yearly average — with moderate rainfall (48 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 🌧️ | 32.2°C | 18.0°C | 25.1°C | 244 mm | 84% | 1.7 m/s | 3.8 |
| 2024 | 33.3°C | 20.2°C | 26.7°C | 3 mm | 79% | 1.7 m/s | 4.2 |
| 2023 | 33.8°C | 18.6°C | 26.2°C | 68 mm | 69% | 1.4 m/s | 4.5 |
| 2022 | 34.3°C | 16.0°C | 25.2°C | 90 mm | 78% | 1.4 m/s | 4.4 |
| 2021 | 33.1°C | 14.6°C | 23.8°C | 127 mm | 86% | 1.9 m/s | 3.9 |
| 2020 | 32.8°C | 14.8°C | 23.8°C | 33 mm | 77% | 1 m/s | 4.5 |
| 2019 | 30.5°C | 17.4°C | 24.0°C | 7 mm | 83% | 1.2 m/s | 3.8 |
| 2018 | 35.3°C | 16.3°C | 25.8°C | 4 mm | 58% | 1.6 m/s | 4.8 |
| 2017 | 35.2°C | 17.4°C | 26.3°C | 6 mm | 67% | 1.3 m/s | 4.4 |
| 2016 | 33.2°C | 14.8°C | 24.0°C | 45 mm | 78% | 1.2 m/s | 4.7 |
| 2015 🔥 | 36.7°C | 16.7°C | 26.7°C | 9 mm | 54% | 1.2 m/s | 4.7 |
| 2014 | 32.0°C | 15.5°C | 23.7°C | 71 mm | 77% | 1.2 m/s | 4.4 |
| 2013 | 31.1°C | 15.7°C | 23.4°C | 185 mm | 84% | 1.9 m/s | 3.6 |
| 2012 | 32.0°C | 12.8°C | 22.4°C | 26 mm | 76% | 1 m/s | 4.8 |
| 2011 | 32.2°C | 15.4°C | 23.8°C | 4 mm | 76% | 1 m/s | 4.6 |
| 2010 | 33.1°C | 15.1°C | 24.1°C | 74 mm | 78% | 1.3 m/s | 4.3 |
| 2009 | 33.8°C | 12.9°C | 23.4°C | 54 mm | 69% | 1.6 m/s | 4.6 |
| 2008 | 32.4°C | 16.2°C | 24.3°C | 10 mm | 79% | 1 m/s | 4.7 |
| 2007 | 31.4°C | 16.3°C | 23.8°C | 28 mm | 79% | 1 m/s | 4.5 |
| 2006 | 33.1°C | 17.9°C | 25.5°C | 10 mm | 74% | 0.9 m/s | 4.7 |
| 2005 | 34.7°C | 17.9°C | 26.3°C | 85 mm | 72% | 1.4 m/s | 4.3 |
| 2004 | 34.1°C | 17.4°C | 25.7°C | 22 mm | 60% | 1.3 m/s | 4.6 |
| 2003 | 33.4°C | 14.8°C | 24.1°C | 83 mm | 74% | 1.7 m/s | 4.4 |
| 2002 | 35.9°C | 15.1°C | 25.5°C | 60 mm | 60% | 1.2 m/s | 4.6 |
| 2001 | 31.7°C | 18.1°C | 24.9°C | 103 mm | 77% | 1.1 m/s | 4.3 |
| 2000 | 32.7°C | 15.9°C | 24.3°C | 1 mm | 69% | 0.9 m/s | 5 |
| 1999 | 33.8°C | 16.7°C | 25.3°C | 89 mm | 73% | 1.4 m/s | 4.5 |
| 1998 | 32.6°C | 14.3°C | 23.5°C | 66 mm | 81% | 1.4 m/s | 4.9 |
| 1997 | 31.0°C | 15.7°C | 23.4°C | 29 mm | 76% | 1.2 m/s | 4.5 |
| 1996 ❄️ | 31.5°C | 12.2°C | 21.8°C | 47 mm | 75% | 1.2 m/s | 4.6 |
| 1995 | 32.7°C | 14.0°C | 23.3°C | 9 mm | 71% | 1 m/s | 5.1 |
| 1994 | 32.8°C | 13.1°C | 22.9°C | 23 mm | 68% | 1.3 m/s | 5.2 |
| 1993 | 32.3°C | 14.3°C | 23.3°C | 10 mm | 71% | 1 m/s | 5.3 |
| 1992 | 36.6°C | 15.3°C | 25.9°C | 35 mm | 54% | 1.3 m/s | 4.8 |
| 1991 | 33.6°C | 15.4°C | 24.5°C | 1 mm | 62% | 1.2 m/s | 5.2 |
| 1990 | 32.4°C | 12.2°C | 22.3°C | 14 mm | 73% | 1.4 m/s | 4.9 |
| 1989 | 34.9°C | 16.1°C | 25.5°C | 28 mm | 57% | 1.2 m/s | 5.2 |
| 1988 | 32.0°C | 16.7°C | 24.4°C | 15 mm | 72% | 1.1 m/s | 5.2 |
| 1987 | 32.1°C | 14.4°C | 23.3°C | 49 mm | 79% | 1 m/s | 4.7 |
| 1986 | 34.8°C | 14.1°C | 24.5°C | 69 mm | 60% | 1.4 m/s | 5 |
| 1985 | 31.2°C | 13.9°C | 22.5°C | 154 mm | 83% | 1.5 m/s | 4.6 |
| 1984 | 32.4°C | 14.2°C | 23.3°C | 8 mm | 70% | 1.3 m/s | 5.1 |
| 1983 | 35.7°C | 14.2°C | 25.0°C | 52 mm | 58% | 1.6 m/s | — |
| 1982 | 35.5°C | 16.9°C | 26.2°C | 14 mm | 56% | 1.2 m/s | — |
| 1981 | 31.1°C | 14.7°C | 22.9°C | 0 mm | 74% | 1.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 33.2°C with lows near 15.6°C (mean 24.4°C), based on 45 years of NASA POWER data.
October averages 48 mm of rainfall in Siwan, one of the drier months. The wettest on record was 244 mm in 2025.
The hottest October reached 36.7°C in 2015. The coldest dipped to 12.2°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.4°C. Daytime highs moved from 33.2°C to 33.3°C and overnight lows from 14.8°C to 17.5°C over the same span.
October is one of the cooler months of the year in Siwan and one of the drier months, so plan for around 33.2°C daytime highs and 15.6°C at night.
Not quite — October is the 5th coolest month in Siwan, averaging 24.4°C.
For October in Siwan, pack light, breathable clothing and sun protection, with typical highs of 33.2°C and lows of 15.6°C.
Relative humidity in October averages 72% — moderately humid.
Average wind speed in October is 1.3 m/s. The windiest October on record averaged 1.9 m/s (2013).
The wettest October on record was 2025 with 244 mm. On average, October sees 48 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 October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
