August is one of the cooler months of the year in Idukki, with average highs near 26.8°C and lows around 18.6°C (mean 22.7°C). It is a relatively wet time of year, averaging 248 mm of rainfall and 92% relative humidity across the period.
August is one of the cooler months of the year in Idukki. Across 45 years of records, the warmest Augusts in Idukki were 2015 and 2023 — when the month averaged 23.9°C — while the coldest was 1985 at 21.6°C. Typical August days reach 26.8°C with nights near 18.6°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 | 22.4°C | 22.3°C | 22.8°C | 22.8°C | 23.5°C | +1.1°C |
| Avg High | 26.3°C | 26.1°C | 27.0°C | 26.9°C | 28.0°C | +1.7°C |
| Avg Low | 18.5°C | 18.5°C | 18.6°C | 18.7°C | 19.0°C | +0.5°C |
| Avg Rain | 250 mm | 218 mm | 232 mm | 277 mm | 275 mm | +25 mm |
August temperatures in Idukki have risen by about 1.2°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 17.5°C (2016) to a record high of 28.9°C (2022).
Rainfall in August is a relatively wet time of year, averaging 248 mm, with a wettest year of 462 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.1°C per decade, widening the gap between day and night.
A good time to visit Idukki
August is a good time to visit Idukki, with days averaging 26.8°C and nights around 18.6°C (mean 22.7°C, close to Idukki's yearly average) and higher rainfall. January and February are marginally more temperate, but August still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 27.3°C | 19.3°C | 23.3°C | 216 mm | 93% | 0.5 m/s | 4.7 |
| 2024 | 28.1°C | 19.5°C | 23.8°C | 318 mm | 93% | 0.5 m/s | 4.8 |
| 2023 | 28.9°C | 18.8°C | 23.9°C | 118 mm | 88% | 0.5 m/s | 6 |
| 2022 | 28.9°C | 18.3°C | 23.6°C | 416 mm | 92% | 0.5 m/s | 4.5 |
| 2021 | 27.3°C | 18.4°C | 22.8°C | 297 mm | 91% | 0.5 m/s | 4.6 |
| 2020 | 27.7°C | 19.6°C | 23.6°C | 286 mm | 92% | 0.5 m/s | 4.9 |
| 2019 | 26.5°C | 19.0°C | 22.7°C | 455 mm | 93% | 0.5 m/s | 4.4 |
| 2018 | 26.2°C | 18.0°C | 22.1°C | 365 mm | 93% | 0.6 m/s | 4.4 |
| 2017 | 27.2°C | 18.9°C | 23.1°C | 316 mm | 92% | 0.5 m/s | 4.7 |
| 2016 | 26.5°C | 17.5°C | 22.0°C | 144 mm | 91% | 0.6 m/s | 5.5 |
| 2015 🔥 | 28.3°C | 19.5°C | 23.9°C | 133 mm | 90% | 0.5 m/s | 5.6 |
| 2014 🌧️ | 27.0°C | 19.1°C | 23.1°C | 462 mm | 92% | 0.5 m/s | 4.8 |
| 2013 | 27.5°C | 19.3°C | 23.4°C | 222 mm | 92% | 0.6 m/s | 5.1 |
| 2012 | 28.1°C | 19.2°C | 23.6°C | 240 mm | 90% | 0.5 m/s | 5 |
| 2011 | 26.0°C | 18.3°C | 22.2°C | 245 mm | 91% | 0.5 m/s | 4.7 |
| 2010 | 26.0°C | 18.6°C | 22.3°C | 185 mm | 93% | 0.6 m/s | 4.4 |
| 2009 | 27.8°C | 18.4°C | 23.1°C | 135 mm | 91% | 0.5 m/s | 5.2 |
| 2008 | 28.3°C | 17.7°C | 23.0°C | 215 mm | 91% | 0.5 m/s | 5.1 |
| 2007 | 26.3°C | 18.9°C | 22.6°C | 241 mm | 93% | 0.5 m/s | 5.1 |
| 2006 | 26.8°C | 18.1°C | 22.4°C | 304 mm | 92% | 0.5 m/s | 5.4 |
| 2005 | 28.6°C | 18.8°C | 23.7°C | 151 mm | 91% | 0.6 m/s | 5.7 |
| 2004 | 26.0°C | 18.9°C | 22.4°C | 191 mm | 92% | 0.6 m/s | 5.3 |
| 2003 | 25.8°C | 18.9°C | 22.4°C | 235 mm | 92% | 0.6 m/s | 5.2 |
| 2002 | 26.9°C | 18.2°C | 22.5°C | 364 mm | 91% | 0.6 m/s | 5.1 |
| 2001 | 26.7°C | 19.2°C | 22.9°C | 116 mm | 91% | 0.6 m/s | 5 |
| 2000 | 26.8°C | 18.6°C | 22.7°C | 367 mm | 90% | 0.7 m/s | 4.4 |
| 1999 | 26.5°C | 18.6°C | 22.6°C | 91 mm | 91% | 0.5 m/s | 5.3 |
| 1998 | 27.0°C | 17.8°C | 22.4°C | 248 mm | 91% | 0.6 m/s | 5.2 |
| 1997 | 25.7°C | 18.1°C | 21.9°C | 330 mm | 92% | 0.6 m/s | 4.3 |
| 1996 | 25.2°C | 18.8°C | 22.0°C | 203 mm | 93% | 0.6 m/s | 4.2 |
| 1995 | 26.6°C | 18.7°C | 22.7°C | 255 mm | 92% | 0.6 m/s | 4.4 |
| 1994 | 27.0°C | 18.2°C | 22.6°C | 330 mm | 93% | 0.6 m/s | 4.4 |
| 1993 | 25.9°C | 19.0°C | 22.4°C | 86 mm | 91% | 0.6 m/s | 4.6 |
| 1992 | 25.3°C | 19.2°C | 22.2°C | 221 mm | 92% | 0.7 m/s | 4.5 |
| 1991 | 25.4°C | 18.9°C | 22.2°C | 308 mm | 92% | 0.6 m/s | 4.3 |
| 1990 | 26.0°C | 18.0°C | 22.0°C | 109 mm | 90% | 0.6 m/s | 4.5 |
| 1989 | 25.9°C | 18.3°C | 22.1°C | 131 mm | 91% | 0.6 m/s | 4.7 |
| 1988 | 26.4°C | 18.9°C | 22.7°C | 290 mm | 93% | 0.6 m/s | 4.1 |
| 1987 | 27.3°C | 18.2°C | 22.8°C | 384 mm | 89% | 0.6 m/s | 4.6 |
| 1986 | 26.7°C | 18.2°C | 22.4°C | 270 mm | 89% | 0.6 m/s | 5.1 |
| 1985 ❄️ | 25.2°C | 18.1°C | 21.6°C | 150 mm | 91% | 0.6 m/s | 4.6 |
| 1984 | 26.1°C | 18.7°C | 22.4°C | 119 mm | 90% | 0.6 m/s | 5.4 |
| 1983 | 26.2°C | 18.8°C | 22.5°C | 198 mm | 90% | 0.6 m/s | — |
| 1982 | 25.8°C | 19.0°C | 22.4°C | 339 mm | 93% | 0.6 m/s | — |
| 1981 | 26.7°C | 18.4°C | 22.5°C | 372 mm | 92% | 0.6 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 26.8°C with lows near 18.6°C (mean 22.7°C), based on 45 years of NASA POWER data.
August averages 248 mm of rainfall in Idukki, a relatively wet time of year. The wettest on record was 462 mm in 2014.
The hottest August reached 28.9°C in 2022. The coldest dipped to 17.5°C in 2016.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.2°C. Daytime highs moved from 26°C to 28.1°C and overnight lows from 18.6°C to 18.9°C over the same span.
August is one of the cooler months of the year in Idukki and a relatively wet time of year, so plan for around 26.8°C daytime highs and 18.6°C at night.
Not quite — August is the 5th coolest month in Idukki, averaging 22.7°C.
For August in Idukki, pack light layers you can adjust through the day, with typical highs of 26.8°C and lows of 18.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 92% — quite humid.
Average wind speed in August is 0.6 m/s. The windiest August on record averaged 0.7 m/s (1992).
The wettest August on record was 2014 with 462 mm. On average, August sees 248 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 Idukki behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
