Kerala monsoon deficit hits 28% as Wayanad records 54% shortfall
Synopsis
With Wayanad recording a 54% rainfall deficit and Idukki at 47%, Kerala's monsoon shortfall of 28% this season is not just a weather statistic — it signals real stress for highland agriculture and water reserves. El Niño is the cited culprit, and with isolated showers unlikely to recover the gap, the state is heading into the post-monsoon period on thin margins.
Key Takeaways
Kerala has recorded a 28 per cent southwest monsoon deficit for the period 1 June to 17 September 2026 , according to the IMD .
Wayanad is the worst-hit district with a 54 per cent rainfall shortfall; Idukki follows at 47 per cent .
The IMD has attributed the weak monsoon to the El Niño phenomenon affecting atmospheric and oceanic conditions.
Punalur recorded the state's highest temperature at 37°C on Wednesday; Thiruvananthapuram touched 35.4°C .
Isolated heavy rainfall is forecast in coming days but is unlikely to significantly close the accumulated deficit.
Kerala has recorded a 28 per cent deficit in southwest monsoon rainfall this season, with Wayanad and Idukki emerging as the worst-affected districts, according to data released by the India Meteorological Department (IMD) covering the period from 1 June to 17 September 2026. The shortfall, arriving as the monsoon enters its final phase, has raised growing concerns over water availability and agricultural stress across the state's high-range belt.
Wayanad and Idukki Worst Hit
Wayanad has logged the steepest deficit in the state at 54 per cent, while Idukki follows closely with a 47 per cent shortfall. Both districts are critical highland zones that depend heavily on seasonal rainfall for agriculture, drinking water reserves, and reservoir recharge. Weather officials note that the significance of this deficit is compounded by the timing — the closing weeks of the southwest monsoon are typically among the wettest.
El Niño Cited as Key Driver
The IMD has attributed the weakened monsoon to the influence of the El Niño phenomenon, which has disrupted the atmospheric and oceanic conditions that ordinarily sustain the southwest monsoon over the subcontinent. El Niño years have historically correlated with below-normal rainfall across peninsular India, and the current season appears consistent with that pattern. This is not Kerala's first El Niño-driven deficit, but the scale of the shortfall in individual districts is notable even by those standards.
Heat Compounds the Weather Anomaly
The rainfall deficit has been accompanied by unusually high temperatures for the tail end of the monsoon season. Punalur recorded the state's highest temperature on Wednesday at 37 degrees Celsius, while Thiruvananthapuram city touched 35.4 degrees Celsius. The combination of deficient rain and persistent heat represents an unusual weather pattern for this time of year, when cooler and wetter conditions are the norm across much of the state.
Uneven Distribution Across Districts
The overall picture masks considerable variation at the district level. Some areas have received intermittent spells of rain, while several others have remained comparatively dry throughout the season. The IMD has forecast isolated heavy rainfall in parts of the state in the coming days, though officials caution that such spells are unlikely to bridge the accumulated deficit in any meaningful way before the monsoon withdraws.
What to Watch
The IMD is closely monitoring evolving conditions as the season nears its end. The primary concern now shifts to reservoir levels and kharif crop output across Wayanad and Idukki, where prolonged dry spells can have a direct bearing on the next planting cycle. Any forecast revision ahead of the northeast monsoon — which typically arrives over Kerala in October — will be keenly watched by farmers and water managers alike.
Point of View
But it also risks becoming a convenient explanation that delays action on longer-term water management reforms the state has repeatedly deferred. What mainstream coverage tends to underplay is the cumulative effect: Kerala has seen increasing volatility in monsoon distribution over the past decade, with both catastrophic floods and sharp deficits within the same region across different years. The real question is whether the state's disaster and water management frameworks are built for a climate that swings between extremes, not just average conditions.
NationPress
17 Sept 2026
Frequently Asked Questions
What is Kerala's southwest monsoon deficit this year?
Kerala has recorded a 28 per cent deficit in southwest monsoon rainfall for the period 1 June to 17 September 2026, according to the India Meteorological Department. The shortfall is most severe in the highland districts of Wayanad and Idukki.
Which district in Kerala has the highest rainfall deficit?
Wayanad has recorded the highest rainfall deficit in Kerala at 54 per cent, followed by Idukki at 47 per cent. Both are major high-range agricultural districts heavily dependent on seasonal rainfall.
Why is Kerala experiencing a monsoon deficit in 2026?
Weather officials have attributed the weaker monsoon to the El Niño phenomenon, which has disrupted the atmospheric and oceanic conditions that normally sustain the southwest monsoon over the subcontinent. El Niño years typically correlate with below-normal rainfall across peninsular India.
Is relief rainfall expected in Kerala?
The IMD has forecast isolated heavy rainfall at some locations in Kerala in the coming days. However, officials caution that these showers are unlikely to make up for the significant accumulated deficit before the monsoon season concludes.
How unusual are the temperatures alongside the rainfall deficit?
Temperatures in parts of Kerala are unusually high for this phase of the monsoon season. Punalur recorded 37 degrees Celsius and Thiruvananthapuram touched 35.4 degrees Celsius on Wednesday — a combination of heat and deficient rain that is atypical for late September in the state.
