October is one of the cooler months of the year in Siwan, with average highs near 30.9°C and lows around 20.3°C (mean 25.6°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 October in Siwan was 2017 — when the month averaged 28.1°C — while the coldest was 2012 at 23.5°C. Typical October days reach 30.9°C with nights near 20.3°C. The long-term trend is warming, about 0.2°C per decade.
October is one of the drier months in Siwan, averaging 48 mm of rainfall. The wettest October on record was 2025 with 244 mm, while the driest was 1981 at 0 mm.
Relative humidity in Siwan during October averages 72%. The most humid October was 2021 at 86%, and the least humid was 2015 at 54%.
October receives about 4.6 kWh/m²/day of solar energy in Siwan. The sunniest October was 1993 at 5.3 kWh/m²/day, and the cloudiest was 2013 at 3.6.
Average wind speed in Siwan during October is 1.3 m/s. The windiest Octobers were 2013 and 2021 at 1.9 m/s, while the calmest were 2000 and 2006 at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.4°C | 25.4°C | 25.6°C | 25.7°C | 26.1°C | +0.7°C |
| Avg High | 31.0°C | 30.9°C | 30.9°C | 30.9°C | 30.8°C | -0.2°C |
| Avg Low | 19.7°C | 19.9°C | 20.3°C | 20.5°C | 21.5°C | +1.8°C |
| Avg Rain | 43 mm | 32 mm | 46 mm | 43 mm | 94 mm | +51 mm |
October temperatures in Siwan have risen by about 0.8°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 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Siwan
October is a good time to visit Siwan, with days averaging 30.9°C and nights around 20.3°C (mean 25.6°C, close to Siwan's yearly average) and moderate rainfall. November and February are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🌧️ | 29.8°C | 25.7°C | 21.5°C | 32.2°C | 18.0°C | 244 mm | 84% | 1.7 m/s | 3.8 |
| 2024 | 31.8°C | 27.2°C | 22.5°C | 33.3°C | 20.2°C | 3 mm | 79% | 1.7 m/s | 4.2 |
| 2023 | 32.1°C | 26.9°C | 21.6°C | 33.8°C | 18.6°C | 68 mm | 69% | 1.4 m/s | 4.5 |
| 2022 | 30.3°C | 25.4°C | 20.4°C | 34.3°C | 16.0°C | 90 mm | 78% | 1.4 m/s | 4.4 |
| 2021 | 29.6°C | 25.5°C | 21.5°C | 33.1°C | 14.6°C | 127 mm | 86% | 1.9 m/s | 3.9 |
| 2020 | 31.0°C | 26.2°C | 21.5°C | 32.8°C | 14.8°C | 33 mm | 77% | 1 m/s | 4.5 |
| 2019 | 28.7°C | 24.6°C | 20.6°C | 30.5°C | 17.4°C | 7 mm | 83% | 1.2 m/s | 3.8 |
| 2018 | 34.1°C | 27.3°C | 20.5°C | 35.3°C | 16.3°C | 4 mm | 58% | 1.6 m/s | 4.8 |
| 2017 🔥 | 33.5°C | 28.1°C | 22.6°C | 35.2°C | 17.4°C | 6 mm | 67% | 1.3 m/s | 4.4 |
| 2016 | 30.7°C | 25.3°C | 19.9°C | 33.2°C | 14.8°C | 45 mm | 78% | 1.2 m/s | 4.7 |
| 2015 | 34.4°C | 27.5°C | 20.7°C | 36.7°C | 16.7°C | 9 mm | 54% | 1.2 m/s | 4.7 |
| 2014 | 29.4°C | 24.8°C | 20.1°C | 32.0°C | 15.5°C | 71 mm | 77% | 1.2 m/s | 4.4 |
| 2013 | 29.0°C | 25.0°C | 21.0°C | 31.1°C | 15.7°C | 185 mm | 84% | 1.9 m/s | 3.6 |
| 2012 ❄️ | 28.9°C | 23.5°C | 18.2°C | 32.0°C | 12.8°C | 26 mm | 76% | 1 m/s | 4.8 |
| 2011 | 30.2°C | 25.3°C | 20.4°C | 32.2°C | 15.4°C | 4 mm | 76% | 1 m/s | 4.6 |
| 2010 | 30.5°C | 25.8°C | 21.1°C | 33.1°C | 15.1°C | 74 mm | 78% | 1.3 m/s | 4.3 |
| 2009 | 30.7°C | 24.5°C | 18.4°C | 33.8°C | 12.9°C | 54 mm | 69% | 1.6 m/s | 4.6 |
| 2008 | 30.0°C | 25.3°C | 20.6°C | 32.4°C | 16.2°C | 10 mm | 79% | 1 m/s | 4.7 |
| 2007 | 29.1°C | 24.5°C | 19.9°C | 31.4°C | 16.3°C | 28 mm | 79% | 1 m/s | 4.5 |
| 2006 | 30.7°C | 25.8°C | 20.8°C | 33.1°C | 17.9°C | 10 mm | 74% | 0.9 m/s | 4.7 |
| 2005 | 31.7°C | 26.6°C | 21.5°C | 34.7°C | 17.9°C | 85 mm | 72% | 1.4 m/s | 4.3 |
| 2004 | 32.2°C | 26.5°C | 20.7°C | 34.1°C | 17.4°C | 22 mm | 60% | 1.3 m/s | 4.6 |
| 2003 | 30.8°C | 25.3°C | 19.7°C | 33.4°C | 14.8°C | 83 mm | 74% | 1.7 m/s | 4.4 |
| 2002 | 33.1°C | 26.6°C | 20.2°C | 35.9°C | 15.1°C | 60 mm | 60% | 1.2 m/s | 4.6 |
| 2001 | 30.0°C | 25.6°C | 21.3°C | 31.7°C | 18.1°C | 103 mm | 77% | 1.1 m/s | 4.3 |
| 2000 | 31.2°C | 25.6°C | 20.0°C | 32.7°C | 15.9°C | 1 mm | 69% | 0.9 m/s | 5 |
| 1999 | 31.1°C | 25.8°C | 20.5°C | 33.8°C | 16.7°C | 89 mm | 73% | 1.4 m/s | 4.5 |
| 1998 | 30.6°C | 26.4°C | 22.3°C | 32.6°C | 14.3°C | 66 mm | 81% | 1.4 m/s | 4.9 |
| 1997 | 29.3°C | 24.2°C | 19.0°C | 31.0°C | 15.7°C | 29 mm | 76% | 1.2 m/s | 4.5 |
| 1996 | 29.5°C | 24.4°C | 19.2°C | 31.5°C | 12.2°C | 47 mm | 75% | 1.2 m/s | 4.6 |
| 1995 | 31.0°C | 25.6°C | 20.2°C | 32.7°C | 14.0°C | 9 mm | 71% | 1 m/s | 5.1 |
| 1994 | 30.7°C | 24.6°C | 18.5°C | 32.8°C | 13.1°C | 23 mm | 68% | 1.3 m/s | 5.2 |
| 1993 | 30.5°C | 25.2°C | 19.8°C | 32.3°C | 14.3°C | 10 mm | 71% | 1 m/s | 5.3 |
| 1992 | 34.2°C | 27.6°C | 21.0°C | 36.6°C | 15.3°C | 35 mm | 54% | 1.3 m/s | 4.8 |
| 1991 | 32.2°C | 25.6°C | 19.0°C | 33.6°C | 15.4°C | 1 mm | 62% | 1.2 m/s | 5.2 |
| 1990 | 30.2°C | 24.7°C | 19.3°C | 32.4°C | 12.2°C | 14 mm | 73% | 1.4 m/s | 4.9 |
| 1989 | 33.1°C | 27.0°C | 21.0°C | 34.9°C | 16.1°C | 28 mm | 57% | 1.2 m/s | 5.2 |
| 1988 | 30.2°C | 24.8°C | 19.4°C | 32.0°C | 16.7°C | 15 mm | 72% | 1.1 m/s | 5.2 |
| 1987 | 29.1°C | 24.5°C | 19.9°C | 32.1°C | 14.4°C | 49 mm | 79% | 1 m/s | 4.7 |
| 1986 | 31.7°C | 25.5°C | 19.2°C | 34.8°C | 14.1°C | 69 mm | 60% | 1.4 m/s | 5 |
| 1985 | 28.1°C | 24.0°C | 19.9°C | 31.2°C | 13.9°C | 154 mm | 83% | 1.5 m/s | 4.6 |
| 1984 | 30.4°C | 24.7°C | 18.9°C | 32.4°C | 14.2°C | 8 mm | 70% | 1.3 m/s | 5.1 |
| 1983 | 33.1°C | 27.0°C | 20.9°C | 35.7°C | 14.2°C | 52 mm | 58% | 1.6 m/s | — |
| 1982 | 33.7°C | 27.2°C | 20.7°C | 35.5°C | 16.9°C | 14 mm | 56% | 1.2 m/s | — |
| 1981 | 29.5°C | 23.6°C | 17.8°C | 31.1°C | 14.7°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 30.9°C with lows near 20.3°C (mean 25.6°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 0.8°C — but days and nights have moved in opposite directions. Overnight lows rose from 19.6°C to 21.5°C while daytime highs eased from 31°C to 30.7°C, narrowing the gap between day and night.
October is one of the cooler months of the year in Siwan and one of the drier months, so plan for around 30.9°C daytime highs and 20.3°C at night.
Not quite — October is the 5th coolest month in Siwan, averaging 25.6°C.
For October in Siwan, pack light, breathable clothing and sun protection, with typical highs of 30.9°C and lows of 20.3°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.
