May is one of the warmer months of the year in Idukki, with average highs near 28.9°C and lows around 21.7°C (mean 25.3°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 1991 — when the month averaged 27.7°C — while the coldest was 1999 at 23.6°C. Typical May days reach 28.9°C with nights near 21.7°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Idukki, averaging 198 mm of rainfall. The wettest May on record was 2004 with 689 mm, while the driest was 1983 at 27 mm.
Relative humidity in Idukki during May averages 83%. The most humid May was 2004 at 90%, and the least humid was 1991 at 71%.
May receives about 5.5 kWh/m²/day of solar energy in Idukki. The sunniest May was 2008 at 6.3 kWh/m²/day, and the cloudiest was 2024 at 4.7.
Average wind speed in Idukki during May is 0.5 m/s. The windiest Mays were 1999, 2013 and 2025, among others at 0.6 m/s, while the calmest were 2020, 2021 and 2023, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.5°C | 25.6°C | 24.9°C | 25.4°C | 25.2°C | -0.3°C |
| Avg High | 29.4°C | 29.5°C | 28.2°C | 28.9°C | 28.5°C | -0.9°C |
| Avg Low | 21.5°C | 21.7°C | 21.5°C | 21.9°C | 22.0°C | +0.5°C |
| Avg Rain | 136 mm | 161 mm | 253 mm | 181 mm | 292 mm | +156 mm |
May temperatures in Idukki have fallen by about 0.5°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 0.1°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 December tend to be the most comfortable for visiting Idukki. That said, May — with days averaging 28.9°C and nights around 21.7°C (mean 25.3°C) and higher rainfall (198 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 27.5°C | 24.9°C | 22.3°C | 30.6°C | 20.9°C | 324 mm | 87% | 0.6 m/s | 4.8 |
| 2024 | 30.0°C | 26.4°C | 22.8°C | 35.8°C | 21.4°C | 422 mm | 83% | 0.5 m/s | 4.7 |
| 2023 | 29.0°C | 25.3°C | 21.6°C | 31.8°C | 19.5°C | 119 mm | 84% | 0.4 m/s | 5.7 |
| 2022 | 26.8°C | 24.1°C | 21.4°C | 30.1°C | 20.1°C | 284 mm | 89% | 0.5 m/s | 5 |
| 2021 | 27.6°C | 24.4°C | 21.2°C | 31.8°C | 19.9°C | 418 mm | 88% | 0.4 m/s | 5.1 |
| 2020 | 29.8°C | 26.2°C | 22.5°C | 34.3°C | 20.9°C | 184 mm | 82% | 0.4 m/s | 5.4 |
| 2019 | 31.3°C | 26.9°C | 22.6°C | 35.6°C | 21.1°C | 65 mm | 78% | 0.5 m/s | 5.7 |
| 2018 | 27.9°C | 24.7°C | 21.6°C | 33.1°C | 20.3°C | 272 mm | 87% | 0.4 m/s | 5.2 |
| 2017 | 29.1°C | 25.6°C | 22.1°C | 33.9°C | 20.9°C | 261 mm | 83% | 0.5 m/s | 5.5 |
| 2016 | 29.7°C | 26.0°C | 22.4°C | 35.0°C | 20.9°C | 191 mm | 81% | 0.5 m/s | 5.4 |
| 2015 | 28.2°C | 24.9°C | 21.5°C | 32.0°C | 20.0°C | 196 mm | 85% | 0.4 m/s | 5.4 |
| 2014 | 28.5°C | 25.1°C | 21.7°C | 32.6°C | 19.7°C | 223 mm | 85% | 0.4 m/s | 5.5 |
| 2013 | 29.1°C | 25.5°C | 21.9°C | 33.5°C | 20.1°C | 158 mm | 81% | 0.6 m/s | 5.6 |
| 2012 | 27.1°C | 24.3°C | 21.5°C | 30.6°C | 20.1°C | 105 mm | 88% | 0.5 m/s | 5.7 |
| 2011 | 29.2°C | 25.4°C | 21.5°C | 34.3°C | 19.6°C | 171 mm | 82% | 0.5 m/s | 6.2 |
| 2010 | 28.8°C | 25.5°C | 22.1°C | 33.2°C | 20.3°C | 170 mm | 85% | 0.5 m/s | 5.5 |
| 2009 | 27.9°C | 24.7°C | 21.6°C | 32.1°C | 19.6°C | 258 mm | 85% | 0.4 m/s | 5.7 |
| 2008 | 27.9°C | 24.5°C | 21.1°C | 29.8°C | 19.1°C | 122 mm | 85% | 0.5 m/s | 6.3 |
| 2007 | 29.1°C | 25.4°C | 21.6°C | 32.4°C | 19.5°C | 152 mm | 82% | 0.5 m/s | 6.2 |
| 2006 | 28.8°C | 25.3°C | 21.8°C | 34.3°C | 20.4°C | 429 mm | 82% | 0.5 m/s | 5.5 |
| 2005 | 29.5°C | 25.6°C | 21.7°C | 32.8°C | 20.5°C | 161 mm | 83% | 0.4 m/s | 5.8 |
| 2004 🌧️ | 26.2°C | 23.7°C | 21.1°C | 33.5°C | 20.0°C | 689 mm | 90% | 0.5 m/s | 5 |
| 2003 | 27.8°C | 24.9°C | 21.9°C | 31.0°C | 21.0°C | 176 mm | 87% | 0.5 m/s | 5.7 |
| 2002 | 28.4°C | 25.1°C | 21.8°C | 35.6°C | 20.9°C | 247 mm | 84% | 0.5 m/s | 5.7 |
| 2001 | 27.5°C | 24.5°C | 21.4°C | 31.2°C | 19.6°C | 195 mm | 86% | 0.5 m/s | 6 |
| 2000 | 28.8°C | 25.0°C | 21.3°C | 32.7°C | 19.7°C | 105 mm | 81% | 0.5 m/s | 6.1 |
| 1999 ❄️ | 26.4°C | 23.6°C | 20.8°C | 32.5°C | 19.4°C | 263 mm | 87% | 0.6 m/s | 5.3 |
| 1998 | 31.1°C | 26.9°C | 22.6°C | 37.0°C | 21.1°C | 179 mm | 78% | 0.5 m/s | 5.3 |
| 1997 | 29.9°C | 25.7°C | 21.5°C | 32.2°C | 19.8°C | 60 mm | 78% | 0.5 m/s | 5.3 |
| 1996 | 30.9°C | 26.3°C | 21.7°C | 33.9°C | 20.4°C | 34 mm | 76% | 0.5 m/s | 5.5 |
| 1995 | 27.3°C | 24.2°C | 21.2°C | 32.3°C | 19.6°C | 296 mm | 86% | 0.5 m/s | 5.1 |
| 1994 | 28.8°C | 25.3°C | 21.7°C | 32.8°C | 20.7°C | 165 mm | 82% | 0.5 m/s | 5.6 |
| 1993 | 30.0°C | 25.9°C | 21.8°C | 34.2°C | 20.7°C | 164 mm | 80% | 0.5 m/s | 5.6 |
| 1992 | 29.9°C | 25.7°C | 21.5°C | 34.1°C | 20.1°C | 163 mm | 80% | 0.5 m/s | 5.6 |
| 1991 🔥 | 32.7°C | 27.7°C | 22.7°C | 35.3°C | 21.6°C | 28 mm | 71% | 0.5 m/s | 5.8 |
| 1990 | 28.0°C | 24.7°C | 21.5°C | 33.6°C | 20.2°C | 263 mm | 83% | 0.6 m/s | 4.8 |
| 1989 | 28.8°C | 25.1°C | 21.4°C | 33.7°C | 20.4°C | 203 mm | 81% | 0.6 m/s | 5.3 |
| 1988 | 28.4°C | 25.1°C | 21.8°C | 32.4°C | 20.6°C | 85 mm | 84% | 0.5 m/s | 5.5 |
| 1987 | 31.5°C | 26.6°C | 21.7°C | 35.9°C | 20.7°C | 108 mm | 74% | 0.4 m/s | 5.9 |
| 1986 | 28.8°C | 25.1°C | 21.3°C | 32.0°C | 19.4°C | 111 mm | 82% | 0.5 m/s | 5.8 |
| 1985 | 30.2°C | 25.8°C | 21.4°C | 35.9°C | 20.3°C | 257 mm | 77% | 0.6 m/s | 5.6 |
| 1984 | 29.8°C | 25.6°C | 21.4°C | 34.2°C | 20.2°C | 87 mm | 80% | 0.5 m/s | 6 |
| 1983 | 30.8°C | 26.4°C | 22.0°C | 35.8°C | 20.9°C | 27 mm | 76% | 0.5 m/s | — |
| 1982 | 28.3°C | 24.7°C | 21.2°C | 31.6°C | 19.9°C | 201 mm | 85% | 0.4 m/s | — |
| 1981 | 28.4°C | 24.9°C | 21.4°C | 32.8°C | 19.7°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 28.9°C with lows near 21.7°C (mean 25.3°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 0.5°C — but days and nights have moved in opposite directions. Overnight lows rose from 21.5°C to 21.9°C while daytime highs eased from 29.5°C to 28.2°C, narrowing the gap between day and night.
May is one of the warmer months of the year in Idukki and a relatively wet time of year, so plan for around 28.9°C daytime highs and 21.7°C at night.
Not quite — May is the 10th coolest month in Idukki, averaging 25.3°C.
For May in Idukki, pack light layers you can adjust through the day, with typical highs of 28.9°C and lows of 21.7°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.
