Idukki has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in April and drop to their lowest in January, while rainfall is highest during summer months.
Humidity remains high throughout the year creating warm and humid conditions.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | ☀️ | 29.7°C | 13.2°C | 21.5°C | 75% | 21 | 0.3 | 5.23 |
| February | 🌞 | 33.3°C | 14.1°C | 23.7°C | 65% | 21 | 0.3 | 5.99 |
| March | 🌞 | 35.4°C | 16.3°C | 25.9°C | 64% | 40 | 0.4 | 6.36 |
| April | ☔ | 35.7°C | 19.9°C | 27.8°C | 73% | 100 | 0.4 | 6.02 |
| May | 🌧️ | 33.2°C | 20.3°C | 26.7°C | 83% | 198 | 0.5 | 5.54 |
| June | 🌧️ | 28.0°C | 19.1°C | 23.5°C | 90% | 359 | 0.6 | 4.86 |
| July | 🌧️ | 26.4°C | 18.5°C | 22.5°C | 92% | 299 | 0.6 | 4.58 |
| August | 🌧️ | 26.8°C | 18.6°C | 22.7°C | 91% | 248 | 0.6 | 4.85 |
| September | 🌧️ | 27.6°C | 18.7°C | 23.1°C | 90% | 208 | 0.5 | 5.16 |
| October | 🌧️ | 28.2°C | 18.0°C | 23.1°C | 90% | 286 | 0.4 | 4.77 |
| November | 🌧️ | 27.5°C | 15.9°C | 21.7°C | 88% | 167 | 0.3 | 4.43 |
| December | ☀️ | 27.6°C | 14.2°C | 20.9°C | 83% | 53 | 0.3 | 4.57 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot Summer.
☔ Heavy Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °C
Temperatures rise steadily from spring, peak in April, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 92% in July · annual avg 82%
The warmest year in Idukki's recorded history was 2019 (avg: 24.5°C), while the coldest was 2011 (avg: 22.7°C).
Average annual high/low · Last 10 years · °C
Total annual precipitation · Last 10 years · mm/year
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 17.7°C | 23.5°C | 29.3°C | 2099 | 85% | 0.4 m/s |
2024 | 18.3°C | 24.4°C | 30.4°C | 2174 | 83% | 0.4 m/s |
2023 | 17.4°C | 23.7°C | 30.1°C | 1987 | 82% | 0.4 m/s |
2022 | 17.4°C | 23.5°C | 29.6°C | 2426 | 85% | 0.4 m/s |
2021 🌧️ | 17.5°C | 23.4°C | 29.4°C | 2777 | 86% | 0.4 m/s |
2020 | 18.0°C | 24.3°C | 30.5°C | 2244 | 83% | 0.4 m/s |
2019 | 18.0°C | 24.5°C | 31.1°C | 2174 | 81% | 0.4 m/s |
2018 | 17.2°C | 23.5°C | 29.8°C | 2152 | 83% | 0.4 m/s |
2017 | 17.9°C | 24.1°C | 30.2°C | 2003 | 82% | 0.4 m/s |
2016 | 17.2°C | 23.8°C | 30.5°C | 1351 | 81% | 0.4 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), April is typically the hottest month in Idukki, Kerala, with average high temperatures around 35.7°C.
January is the coldest month in Idukki, with average low temperatures around 13.2°C.
June receives the most rainfall with approximately 359 mm, while February is the driest with 21 mm.
The highest recorded temperature was 38.0°C in April 1983. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was 10.9°C in January 1999.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
Idukki receives the most sunlight in March with an average solar radiation of 6.36 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Kerala.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
