Himachal Pradesh Grapples with Unprecedented Early Heat Wave
Heat waves have struck Himachal Pradesh unusually early this year, triggering significant concerns among residents and environmental experts. According to the Meteorological Centre in Shimla, the mountain state recorded a heat wave on March 6, marking the earliest occurrence in at least the last five years.
Record-Breaking Temperatures and Alerts
On March 6, maximum temperatures soared above the 30-degree Celsius mark in nine out of 36 weather stations across the state. This prompted the weather department to issue a heat wave alert. In the following days, temperatures continued to hover 2 to 8 degrees above normal levels. On March 9, Una recorded the highest maximum temperature of 35 degrees Celsius, setting a record for the month so far.
Minimum temperatures also showed an unprecedented rise, registering 2 to 8 degrees above normal statewide. The Met defines a heat wave in plain areas when the maximum temperature exceeds normal by 4.5 degrees and remains over 40 degrees Celsius for at least two consecutive days. In hilly regions like Himachal Pradesh, an alert is sounded when the maximum temperature stays above 30 degrees Celsius for two straight days with a departure of at least 4.5 degrees from normal. A severe heat wave is declared when temperatures rise 6.5 degrees above normal.
During the first fortnight of March, the Met issued a yellow alert for heat wave to severe heat wave on seven days: March 6, 7, 8, 9, 10, 13, and 14.
Historical Context and Comparisons
Compared to previous years, heat waves in Himachal Pradesh arrived much later in the past. In 2025, a heat wave was recorded on April 6, while in 2024 it occurred on May 19. The state experienced a heat wave on March 16 in 2022. Notably, no heat wave was recorded in 2023 due to frequent rainfall activity from March through July, which culminated in a devastating flood in the Beas river in Kullu.
Meteorological Explanations
According to Shobhit Katiyar, director of Met Shimla, the unusually high temperatures in the first two weeks of March were driven by two primary factors. "Two factors ran simultaneously — anti-cyclonic circulation, a large-scale high-pressure atmospheric motion that causes dry weather, and advection, or the inflow of warm winds from the Pakistan side — shot up the mercury in the north-western states, including Himachal Pradesh," Katiyar explained. "Also, the absence of a balancing factor like Western Disturbance activity in the first weeks of March further caused the temperatures to rise."
Climate Change Concerns and Environmental Impact
While Katiyar suggested that this temperature rise is not highly unusual and may normalize with recent rainfall, he acknowledged that if early heat waves persist over a longer period, such as ten years, it could indicate climate change. However, environmentalists view the early warming as a clear sign of changing weather patterns.
Kulbhushan Upmanyu, a veteran environmentalist based in Chamba, warned of far-reaching consequences. "All extreme weather events are the side effects of a changing climate. Besides adversely impacting agriculture and horticulture in the state, an early warming of the weather, as we are seeing this month, can speed up the melting of glaciers and trigger forest fires early, prolonging the fire season," said Upmanyu.
Key Data Points
Arrival of Heat Wave in Himachal Pradesh:
- 2022: March 16
- 2023: No heat wave
- 2024: May 19
- 2025: April 6
- 2026: March 6
High Temperature Records in March:
- March 5: Highest Max temp 34.5°C, Highest Min temp 17.8°C
- March 6: Highest Max temp 34°C, Highest Min temp 18.9°C
- March 7: Highest Max temp 33.8°C, Highest Min temp 19.7°C
- March 8: Highest Max temp 33.4°C, Highest Min temp 19.9°C
- March 9: Highest Max temp 35°C, Highest Min temp 18°C
- March 10: Highest Max temp 34.7°C, Highest Min temp 19.5°C
- March 11: Highest Max temp 33.2°C, Highest Min temp 19.5°C
- March 12: Highest Max temp 32.6°C, Highest Min temp 17.8°C
This early heat wave underscores the growing challenges posed by erratic weather patterns and highlights the urgent need for climate resilience strategies in vulnerable regions like Himachal Pradesh.
