Climate Overview
The climate in Idukki is hot. The average annual temperature is 26°C and approximately 3473mm of precipitation falls per year. Idukki receives a notable amount of rainfall throughout the year, including during its driest month. Idukki sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Idukki sees moderate temperature variation throughout the year, ranging from 21°C to 33°C. The warmest month is March, when average highs reach 33°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 21°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Idukki is a very wet location, receiving approximately 3473mm of precipitation annually, which averages out to around 289mm per month. The wettest month is October, averaging 467mm of rainfall. August and November also tend to see above-average precipitation. The driest month is February, with just 38mm. That's 428mm less than October, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Idukki is relatively calm, with an average annual wind speed of 9km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.
Seasons
88 days until Summer
It is currently spring in Idukki, which began on March 20, 2026. Idukki sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in March at around 33°C, while the coldest stretch bottoms out in January near 21°C. Summer is next, beginning on June 21, 2026 — 88 days from now.
Spring
Temperatures range from 24 to 33°C. Rainfall is heavy, totalling around 655mm across the season with a monthly average of 218mm. Winds are generally light, averaging 9km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 28°C. Rainfall is heavy, totalling around 1299mm across the season with a monthly average of 433mm. Winds are generally light, averaging 10km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 1196mm across the season with a monthly average of 399mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 33°C. Rainfall is heavy, totalling around 323mm across the season with a monthly average of 108mm. Winds are generally light, averaging 9km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Idukki based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
