January is one of the cooler months of the year in Theni, with average highs near 29.8°C and lows around 13.3°C (mean 21.6°C). It is one of the drier months, averaging 19 mm of rainfall and 76% relative humidity across the period.
January is one of the cooler months of the year in Theni. Across 45 years of records, the warmest January in Theni was 2013 — when the month averaged 23.5°C — while the coldest was 2006 at 19.1°C. Typical January days reach 29.8°C with nights near 13.3°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 | 21.6°C | 21.2°C | 21.7°C | 22.0°C | 21.5°C | -0.1°C |
| Avg High | 29.9°C | 29.7°C | 30.0°C | 30.3°C | 28.6°C | -1.3°C |
| Avg Low | 13.3°C | 12.6°C | 13.2°C | 13.6°C | 14.3°C | +1°C |
| Avg Rain | 29 mm | 14 mm | 11 mm | 8 mm | 46 mm | +16 mm |
January temperatures in Theni have stayed relatively stable across the record.
January has ranged from a record low of 11.6°C (1999) to a record high of 33.6°C (1983).
Rainfall in January is one of the drier months, averaging 19 mm, with a wettest year of 186 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
One of the best times to visit Theni
January is one of the best times to visit Theni. Expect days averaging 29.8°C and nights around 13.3°C (mean 21.6°C) — cooler than Theni's yearly average — with low rainfall (19 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 28.6°C | 14.2°C | 21.4°C | 21 mm | 82% | 1.3 m/s | 4.6 |
| 2024 | 29.4°C | 15.2°C | 22.3°C | 31 mm | 84% | 1.1 m/s | 4.8 |
| 2023 | 28.0°C | 13.2°C | 20.6°C | 10 mm | 78% | 1.2 m/s | 5.3 |
| 2022 | 27.8°C | 15.4°C | 21.6°C | 21 mm | 85% | 1.1 m/s | 5.2 |
| 2021 🌧️ | 27.0°C | 13.9°C | 20.5°C | 186 mm | 89% | 1.3 m/s | 4.2 |
| 2020 | 30.9°C | 14.0°C | 22.5°C | 3 mm | 80% | 1.1 m/s | 5.4 |
| 2019 | 32.2°C | 13.2°C | 22.7°C | 1 mm | 67% | 1.2 m/s | 5.5 |
| 2018 | 30.3°C | 13.8°C | 22.0°C | 5 mm | 72% | 1.1 m/s | 5.1 |
| 2017 | 30.9°C | 13.7°C | 22.3°C | 39 mm | 66% | 1.4 m/s | 5 |
| 2016 | 30.0°C | 13.4°C | 21.7°C | 1 mm | 78% | 1.1 m/s | 5.4 |
| 2015 | 30.2°C | 13.1°C | 21.6°C | 4 mm | 74% | 1.1 m/s | 5.4 |
| 2014 | 30.5°C | 15.2°C | 22.9°C | 9 mm | 71% | 1.4 m/s | 5.3 |
| 2013 🔥 | 31.9°C | 15.1°C | 23.5°C | 3 mm | 65% | 1.3 m/s | 5.6 |
| 2012 | 30.2°C | 12.4°C | 21.3°C | 3 mm | 72% | 1.2 m/s | 5.7 |
| 2011 | 26.9°C | 12.3°C | 19.6°C | 5 mm | 84% | 1.3 m/s | 5 |
| 2010 | 30.3°C | 13.7°C | 22.0°C | 11 mm | 74% | 1.3 m/s | 5.4 |
| 2009 | 30.7°C | 12.9°C | 21.8°C | 7 mm | 75% | 1.3 m/s | 5.6 |
| 2008 | 31.6°C | 13.4°C | 22.5°C | 2 mm | 74% | 1.2 m/s | 5.7 |
| 2007 | 28.4°C | 12.7°C | 20.5°C | 5 mm | 79% | 1.3 m/s | 5.2 |
| 2006 ❄️ | 26.1°C | 12.0°C | 19.1°C | 20 mm | 84% | 1.2 m/s | 5.1 |
| 2005 | 29.1°C | 13.6°C | 21.4°C | 33 mm | 78% | 1.1 m/s | 5.1 |
| 2004 | 31.7°C | 13.4°C | 22.6°C | 11 mm | 73% | 1.2 m/s | 5.6 |
| 2003 | 32.1°C | 14.0°C | 23.1°C | 4 mm | 70% | 1.4 m/s | 5.2 |
| 2002 | 30.9°C | 12.6°C | 21.7°C | 7 mm | 76% | 1.2 m/s | 5.1 |
| 2001 | 30.0°C | 14.2°C | 22.1°C | 16 mm | 75% | 1.3 m/s | 4.8 |
| 2000 | 29.8°C | 13.5°C | 21.7°C | 12 mm | 75% | 1.4 m/s | 5.1 |
| 1999 | 28.1°C | 11.6°C | 19.9°C | 3 mm | 79% | 1.1 m/s | 5.7 |
| 1998 | 28.4°C | 14.1°C | 21.2°C | 1 mm | 84% | 1.2 m/s | 5 |
| 1997 | 29.8°C | 12.4°C | 21.1°C | 5 mm | 77% | 1.1 m/s | 5.3 |
| 1996 | 30.4°C | 13.1°C | 21.7°C | 10 mm | 69% | 1.4 m/s | 5.4 |
| 1995 | 29.9°C | 12.2°C | 21.1°C | 23 mm | 76% | 1.2 m/s | 5 |
| 1994 | 26.7°C | 12.5°C | 19.6°C | 70 mm | 87% | 1.2 m/s | 5.3 |
| 1993 | 29.6°C | 11.9°C | 20.7°C | 0 mm | 75% | 1.3 m/s | 5.2 |
| 1992 | 30.4°C | 12.4°C | 21.4°C | 5 mm | 72% | 1.4 m/s | 5.7 |
| 1991 | 32.6°C | 13.4°C | 23.0°C | 0 mm | 67% | 1.3 m/s | 5.2 |
| 1990 | 30.8°C | 12.9°C | 21.8°C | 24 mm | 64% | 1.4 m/s | 5.4 |
| 1989 | 31.5°C | 13.5°C | 22.5°C | 1 mm | 65% | 1.4 m/s | 5 |
| 1988 | 28.5°C | 13.0°C | 20.7°C | 0 mm | 80% | 1.2 m/s | 5.6 |
| 1987 | 31.1°C | 12.4°C | 21.8°C | 3 mm | 67% | 1.4 m/s | 5.5 |
| 1986 | 31.0°C | 13.8°C | 22.4°C | 16 mm | 75% | 1.2 m/s | 5.2 |
| 1985 | 29.5°C | 13.2°C | 21.3°C | 122 mm | 80% | 1.2 m/s | 5.1 |
| 1984 | 27.2°C | 14.5°C | 20.8°C | 85 mm | 86% | 1.2 m/s | 4.6 |
| 1983 | 33.6°C | 12.6°C | 23.1°C | 0 mm | 66% | 1.3 m/s | — |
| 1982 | 27.2°C | 13.1°C | 20.2°C | 0 mm | 83% | 1.1 m/s | — |
| 1981 | 29.6°C | 14.0°C | 21.8°C | 37 mm | 75% | 1.2 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 29.8°C with lows near 13.3°C (mean 21.6°C), based on 45 years of NASA POWER data.
January averages 19 mm of rainfall in Theni, one of the drier months. The wettest on record was 186 mm in 2021.
The hottest January reached 33.6°C in 1983. The coldest dipped to 11.6°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have fallen by about 0.1°C. Daytime highs moved from 29.4°C to 28.2°C and overnight lows from 13.5°C to 14.4°C over the same span.
January is one of the cooler months of the year in Theni and one of the drier months, so plan for around 29.8°C daytime highs and 13.3°C at night.
Not quite — January is the 2nd coolest month in Theni, averaging 21.6°C.
For January in Theni, pack light layers you can adjust through the day, with typical highs of 29.8°C and lows of 13.3°C.
Relative humidity in January averages 76% — quite humid.
Average wind speed in January is 1.2 m/s. The windiest January on record averaged 1.4 m/s (1987).
The wettest January on record was 2021 with 186 mm. On average, January sees 19 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 Theni 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.
