May is one of the warmer months of the year in Idukki, with average highs near 33.2°C and lows around 20.3°C (mean 26.8°C). It is a relatively wet time of year, averaging 198 mm of rainfall and 83% relative humidity across the period.
May is one of the warmer months of the year in Idukki. Across 45 years of records, the warmest May in Idukki was 1998 — when the month averaged 29°C — while the coldest was 2008 at 24.5°C. Typical May days reach 33.2°C with nights near 20.3°C. The long-term May temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.0°C | 27.1°C | 26.3°C | 26.9°C | 26.4°C | -0.6°C |
| Avg High | 33.8°C | 33.8°C | 32.5°C | 33.4°C | 32.4°C | -1.4°C |
| Avg Low | 20.2°C | 20.4°C | 20.0°C | 20.3°C | 20.5°C | +0.3°C |
| Avg Rain | 136 mm | 161 mm | 253 mm | 181 mm | 292 mm | +156 mm |
May temperatures in Idukki have fallen by about 0.9°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 19.1°C (2008) to a record high of 37°C (1998).
Rainfall in May is a relatively wet time of year, averaging 198 mm, with a wettest year of 689 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.3°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A quieter season to visit Idukki
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Idukki. That said, May — with days averaging 33.2°C and nights around 20.3°C (mean 26.8°C) and higher rainfall (198 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 30.6°C | 20.9°C | 25.7°C | 324 mm | 87% | 0.6 m/s | 4.8 |
| 2024 | 35.8°C | 21.4°C | 28.6°C | 422 mm | 83% | 0.5 m/s | 4.7 |
| 2023 | 31.8°C | 19.5°C | 25.7°C | 119 mm | 84% | 0.4 m/s | 5.7 |
| 2022 | 30.1°C | 20.1°C | 25.1°C | 284 mm | 89% | 0.5 m/s | 5 |
| 2021 | 31.8°C | 19.9°C | 25.9°C | 418 mm | 88% | 0.4 m/s | 5.1 |
| 2020 | 34.3°C | 20.9°C | 27.6°C | 184 mm | 82% | 0.4 m/s | 5.4 |
| 2019 | 35.6°C | 21.1°C | 28.3°C | 65 mm | 78% | 0.5 m/s | 5.7 |
| 2018 | 33.1°C | 20.3°C | 26.7°C | 272 mm | 87% | 0.4 m/s | 5.2 |
| 2017 | 33.9°C | 20.9°C | 27.4°C | 261 mm | 83% | 0.5 m/s | 5.5 |
| 2016 | 35.0°C | 20.9°C | 28.0°C | 191 mm | 81% | 0.5 m/s | 5.4 |
| 2015 | 32.0°C | 20.0°C | 26.0°C | 196 mm | 85% | 0.4 m/s | 5.4 |
| 2014 | 32.6°C | 19.7°C | 26.2°C | 223 mm | 85% | 0.4 m/s | 5.5 |
| 2013 | 33.5°C | 20.1°C | 26.8°C | 158 mm | 81% | 0.6 m/s | 5.6 |
| 2012 | 30.6°C | 20.1°C | 25.4°C | 105 mm | 88% | 0.5 m/s | 5.7 |
| 2011 | 34.3°C | 19.6°C | 27.0°C | 171 mm | 82% | 0.5 m/s | 6.2 |
| 2010 | 33.2°C | 20.3°C | 26.7°C | 170 mm | 85% | 0.5 m/s | 5.5 |
| 2009 | 32.1°C | 19.6°C | 25.8°C | 258 mm | 85% | 0.4 m/s | 5.7 |
| 2008 ❄️ | 29.8°C | 19.1°C | 24.5°C | 122 mm | 85% | 0.5 m/s | 6.3 |
| 2007 | 32.4°C | 19.5°C | 25.9°C | 152 mm | 82% | 0.5 m/s | 6.2 |
| 2006 | 34.3°C | 20.4°C | 27.4°C | 429 mm | 82% | 0.5 m/s | 5.5 |
| 2005 | 32.8°C | 20.5°C | 26.6°C | 161 mm | 83% | 0.4 m/s | 5.8 |
| 2004 🌧️ | 33.5°C | 20.0°C | 26.8°C | 689 mm | 90% | 0.5 m/s | 5 |
| 2003 | 31.0°C | 21.0°C | 26.0°C | 176 mm | 87% | 0.5 m/s | 5.7 |
| 2002 | 35.6°C | 20.9°C | 28.2°C | 247 mm | 84% | 0.5 m/s | 5.7 |
| 2001 | 31.2°C | 19.6°C | 25.4°C | 195 mm | 86% | 0.5 m/s | 6 |
| 2000 | 32.7°C | 19.7°C | 26.2°C | 105 mm | 81% | 0.5 m/s | 6.1 |
| 1999 | 32.5°C | 19.4°C | 25.9°C | 263 mm | 87% | 0.6 m/s | 5.3 |
| 1998 🔥 | 37.0°C | 21.1°C | 29.0°C | 179 mm | 78% | 0.5 m/s | 5.3 |
| 1997 | 32.2°C | 19.8°C | 26.0°C | 60 mm | 78% | 0.5 m/s | 5.3 |
| 1996 | 33.9°C | 20.4°C | 27.1°C | 34 mm | 76% | 0.5 m/s | 5.5 |
| 1995 | 32.3°C | 19.6°C | 25.9°C | 296 mm | 86% | 0.5 m/s | 5.1 |
| 1994 | 32.8°C | 20.7°C | 26.8°C | 165 mm | 82% | 0.5 m/s | 5.6 |
| 1993 | 34.2°C | 20.7°C | 27.5°C | 164 mm | 80% | 0.5 m/s | 5.6 |
| 1992 | 34.1°C | 20.1°C | 27.1°C | 163 mm | 80% | 0.5 m/s | 5.6 |
| 1991 | 35.3°C | 21.6°C | 28.5°C | 28 mm | 71% | 0.5 m/s | 5.8 |
| 1990 | 33.6°C | 20.2°C | 26.9°C | 263 mm | 83% | 0.6 m/s | 4.8 |
| 1989 | 33.7°C | 20.4°C | 27.0°C | 203 mm | 81% | 0.6 m/s | 5.3 |
| 1988 | 32.4°C | 20.6°C | 26.5°C | 85 mm | 84% | 0.5 m/s | 5.5 |
| 1987 | 35.9°C | 20.7°C | 28.3°C | 108 mm | 74% | 0.4 m/s | 5.9 |
| 1986 | 32.0°C | 19.4°C | 25.7°C | 111 mm | 82% | 0.5 m/s | 5.8 |
| 1985 | 35.9°C | 20.3°C | 28.1°C | 257 mm | 77% | 0.6 m/s | 5.6 |
| 1984 | 34.2°C | 20.2°C | 27.2°C | 87 mm | 80% | 0.5 m/s | 6 |
| 1983 | 35.8°C | 20.9°C | 28.3°C | 27 mm | 76% | 0.5 m/s | — |
| 1982 | 31.6°C | 19.9°C | 25.7°C | 201 mm | 85% | 0.4 m/s | — |
| 1981 | 32.8°C | 19.7°C | 26.2°C | 141 mm | 83% | 0.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 33.2°C with lows near 20.3°C (mean 26.8°C), based on 45 years of NASA POWER data.
May averages 198 mm of rainfall in Idukki, a relatively wet time of year. The wettest on record was 689 mm in 2004.
The hottest May reached 37°C in 1998. The coldest dipped to 19.1°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 0.9°C. Daytime highs moved from 34.1°C to 32°C and overnight lows from 20.2°C to 20.4°C over the same span.
May is one of the warmer months of the year in Idukki and a relatively wet time of year, so plan for around 33.2°C daytime highs and 20.3°C at night.
Not quite — May is the 11th coolest month in Idukki, averaging 26.8°C.
For May in Idukki, pack light, breathable clothing and sun protection, with typical highs of 33.2°C and lows of 20.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 83% — quite humid.
Average wind speed in May is 0.5 m/s. The windiest May on record averaged 0.6 m/s (1985).
The wettest May on record was 2004 with 689 mm. On average, May sees 198 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
