January is one of the cooler months of the year in Ariyalur, with average highs near 31.5°C and lows around 17.9°C (mean 24.7°C). It is one of the drier months, averaging 25 mm of rainfall and 79% relative humidity across the period.
January is one of the cooler months of the year in Ariyalur. Across 45 years of records, the warmest January in Ariyalur was 1983 — when the month averaged 26.6°C — while the coldest was 1997 at 22.6°C. Typical January days reach 31.5°C with nights near 17.9°C. The long-term January temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.1°C | 24.5°C | 25.0°C | 24.4°C | 24.6°C | -0.5°C |
| Avg High | 32.0°C | 31.7°C | 32.1°C | 30.9°C | 30.6°C | -1.4°C |
| Avg Low | 18.2°C | 17.4°C | 17.9°C | 17.9°C | 18.6°C | +0.4°C |
| Avg Rain | 31 mm | 15 mm | 14 mm | 18 mm | 63 mm | +32 mm |
January temperatures in Ariyalur have fallen by about 0.6°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 15.6°C (1997) to a record high of 35.2°C (1983).
Rainfall in January is one of the drier months, averaging 25 mm, with a wettest year of 189 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.4°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
One of the best times to visit Ariyalur
January is one of the best times to visit Ariyalur. Expect days averaging 31.5°C and nights around 17.9°C (mean 24.7°C) — cooler than Ariyalur's yearly average — with low rainfall (25 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.7°C | 19.1°C | 24.4°C | 26 mm | 85% | 3 m/s | 4.5 |
| 2024 | 31.3°C | 19.1°C | 25.2°C | 88 mm | 83% | 2.7 m/s | 4.6 |
| 2023 | 30.7°C | 17.2°C | 23.9°C | 10 mm | 78% | 2.8 m/s | 5 |
| 2022 | 31.0°C | 18.9°C | 24.9°C | 53 mm | 85% | 2.4 m/s | 4.7 |
| 2021 🌧️ | 29.6°C | 19.0°C | 24.3°C | 189 mm | 89% | 2.7 m/s | 3.9 |
| 2020 | 31.3°C | 18.1°C | 24.7°C | 13 mm | 83% | 2.3 m/s | 5.2 |
| 2019 | 32.4°C | 17.6°C | 25.0°C | 1 mm | 75% | 2.8 m/s | 5.2 |
| 2018 | 30.0°C | 17.3°C | 23.7°C | 23 mm | 81% | 2.6 m/s | 5.1 |
| 2017 | 32.6°C | 18.1°C | 25.3°C | 77 mm | 71% | 3.1 m/s | 4.8 |
| 2016 | 29.9°C | 18.0°C | 24.0°C | 2 mm | 84% | 2.3 m/s | 4.9 |
| 2015 | 30.8°C | 17.3°C | 24.0°C | 8 mm | 80% | 2.7 m/s | 4.8 |
| 2014 | 32.3°C | 20.0°C | 26.1°C | 8 mm | 72% | 3.3 m/s | 4.8 |
| 2013 | 32.4°C | 19.0°C | 25.7°C | 7 mm | 74% | 3 m/s | 5.3 |
| 2012 | 30.1°C | 17.0°C | 23.5°C | 10 mm | 80% | 2.3 m/s | 5.3 |
| 2011 | 28.8°C | 17.7°C | 23.2°C | 25 mm | 86% | 3 m/s | 5 |
| 2010 | 29.4°C | 17.4°C | 23.4°C | 19 mm | 85% | 2.6 m/s | 4.8 |
| 2009 | 30.2°C | 18.7°C | 24.5°C | 19 mm | 82% | 2.6 m/s | 5.2 |
| 2008 | 31.7°C | 17.1°C | 24.4°C | 30 mm | 84% | 2.4 m/s | 5.2 |
| 2007 | 31.8°C | 18.1°C | 25.0°C | 3 mm | 76% | 3 m/s | 4.9 |
| 2006 | 29.7°C | 16.3°C | 23.0°C | 21 mm | 85% | 2.6 m/s | 4.9 |
| 2005 | 32.0°C | 17.6°C | 24.8°C | 7 mm | 79% | 2.6 m/s | 5.1 |
| 2004 | 33.1°C | 17.8°C | 25.4°C | 8 mm | 74% | 2.8 m/s | 5.1 |
| 2003 | 33.6°C | 19.2°C | 26.4°C | 3 mm | 71% | 3.2 m/s | 5 |
| 2002 | 34.3°C | 17.9°C | 26.1°C | 28 mm | 76% | 2.8 m/s | 4.7 |
| 2001 | 32.3°C | 18.2°C | 25.3°C | 4 mm | 78% | 3 m/s | 4.7 |
| 2000 | 32.3°C | 17.8°C | 25.0°C | 14 mm | 78% | 3 m/s | 5 |
| 1999 | 30.5°C | 17.2°C | 23.9°C | 5 mm | 82% | 2.9 m/s | 5.3 |
| 1998 | 31.0°C | 18.5°C | 24.7°C | 3 mm | 82% | 2.5 m/s | 4.6 |
| 1997 ❄️ | 29.6°C | 15.6°C | 22.6°C | 26 mm | 83% | 2.4 m/s | 4.7 |
| 1996 | 33.2°C | 19.2°C | 26.2°C | 3 mm | 68% | 3.1 m/s | 4.8 |
| 1995 | 32.6°C | 17.6°C | 25.1°C | 32 mm | 76% | 3.1 m/s | 4.3 |
| 1994 | 29.6°C | 17.5°C | 23.5°C | 6 mm | 85% | 2.6 m/s | 4.8 |
| 1993 | 32.0°C | 17.6°C | 24.8°C | 3 mm | 76% | 2.6 m/s | 4.8 |
| 1992 | 31.9°C | 16.5°C | 24.2°C | 3 mm | 74% | 3 m/s | 4.9 |
| 1991 | 34.4°C | 18.4°C | 26.4°C | 4 mm | 72% | 2.9 m/s | 4.7 |
| 1990 | 32.4°C | 15.7°C | 24.0°C | 62 mm | 75% | 2.6 m/s | 5.1 |
| 1989 | 33.2°C | 17.7°C | 25.5°C | 7 mm | 71% | 3.1 m/s | 4.4 |
| 1988 | 31.9°C | 17.8°C | 24.8°C | 2 mm | 77% | 2.8 m/s | 4.9 |
| 1987 | 32.6°C | 18.4°C | 25.5°C | 7 mm | 71% | 3.1 m/s | 4.9 |
| 1986 | 31.3°C | 18.5°C | 24.9°C | 57 mm | 81% | 3 m/s | 4.4 |
| 1985 | 31.6°C | 18.4°C | 25.0°C | 100 mm | 81% | 2.5 m/s | 4.8 |
| 1984 | 29.0°C | 19.4°C | 24.2°C | 64 mm | 86% | 2.5 m/s | 4.1 |
| 1983 🔥 | 35.2°C | 18.0°C | 26.6°C | 1 mm | 69% | 2.8 m/s | — |
| 1982 | 30.6°C | 18.2°C | 24.4°C | 2 mm | 80% | 2.4 m/s | — |
| 1981 | 32.3°C | 17.8°C | 25.1°C | 38 mm | 74% | 2.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 31.5°C with lows near 17.9°C (mean 24.7°C), based on 45 years of NASA POWER data.
January averages 25 mm of rainfall in Ariyalur, one of the drier months. The wettest on record was 189 mm in 2021.
The hottest January reached 35.2°C in 1983. The coldest dipped to 15.6°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have fallen by about 0.6°C. Daytime highs moved from 31.7°C to 30.5°C and overnight lows from 18.4°C to 18.7°C over the same span.
January is one of the cooler months of the year in Ariyalur and one of the drier months, so plan for around 31.5°C daytime highs and 17.9°C at night.
Not quite — January is the 2nd coolest month in Ariyalur, averaging 24.7°C.
For January in Ariyalur, pack light, breathable clothing and sun protection, with typical highs of 31.5°C and lows of 17.9°C.
Relative humidity in January averages 79% — quite humid.
Average wind speed in January is 2.8 m/s. The windiest January on record averaged 3.3 m/s (2014).
The wettest January on record was 2021 with 189 mm. On average, January sees 25 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 Ariyalur behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
