Varanasi's Monsoon Swings: Heat, Haze, and Heavy Rain

On July 26 and 27, 2026, Varanasi recorded its highest average temperatures of the entire month — 34.4°C and 34.5°C respectively — while humidity cratered to just 49–50 percent and the sky turned a dull, smoky grey. That combination of extreme heat, near-zero rainfall, and poor visibility tells a story that goes well beyond the thermometer. The thirty days spanning July 24 to August 22 show a city caught between two opposing weather regimes: a scorching, haze-choked opening fortnight and a rain-drenched, cooler second half that brought its own dramatic disruptions. Understanding how these forces interacted reveals what this monsoon season has actually meant for residents of the Ganga ghats.

Trend Snapshot: Key Metrics Across the Period

Metric	Period Average	Lowest (Date)	Highest (Date)	Net Change
Avg Temperature (°C)	31.0	21.3 — Aug 17	34.5 — Jul 27	+1.8°C
Max Temperature (°C)	35.0	29.1 — Aug 17	38.7 — Jul 27	+1.6°C
Min Temperature (°C)	27.7	17.4 — Aug 17	31.6 — Jul 27	+2.7°C
Avg Humidity (%)	66.4	49 — Jul 27	89 — Aug 18	+1
Max Wind Speed (km/h)	16.4	9.7 — Jul 25	30.2 — Jul 29	−6.1
Total Precipitation (mm)	7.0 daily avg	0.0 — Jul 26	38.3 — Aug 16	+7.7
Dominant Sky Condition	Partly Cloudy	15 of 30 days; Smoky haze on 5 days
UV Condition	Very High / Extreme	Extreme on 12 days, Very High on 15 days

Max, average, and minimum temperatures across the daily weather history.

The Haze Window: When Heat and Dry Air Collided

The most striking feature of this dataset is the five-day smoky haze signature — appearing on July 26–27 and again on August 12–13 and 15. These were not random events. Each haze episode coincided with a sharp drop in humidity, near-absent rainfall, and temperatures pushing toward or above 34°C. On July 26, precipitation was literally zero, humidity sat at 50 percent, and the average temperature hit 34.4°C. The following day was even hotter at 34.5°C with humidity at 49 percent — the driest reading of the entire month.

What makes this particularly significant for air quality is the interaction between temperature and wind. On July 25, winds were at their calmest — just 9.7 km/h — right before the haze intensified. Stagnant air, combined with high temperatures and low moisture, creates ideal conditions for particulate accumulation near the surface. Varanasi's dense urban core and proximity to agricultural burning zones in the broader Gangetic Plain make it especially vulnerable to these haze pockets during monsoon breaks.

The second haze cluster in mid-August followed a similar pattern. August 12 and 13 brought humidity down to 62 and 60 percent respectively, winds stayed light at 14 and 12.2 km/h, and rainfall was negligible — just 0.3 mm and 0.4 mm. Average temperatures climbed back to 32.3°C and 32.9°C. This was the monsoon's mid-month pause, and the atmosphere responded predictably: haze returned, UV intensity shot back to Extreme, and air quality conditions deteriorated. For residents with respiratory conditions, these recurring dry spells within the monsoon are arguably more dangerous than the peak summer months, precisely because they arrive unexpectedly.

The Rainfall Turning Point and August 17's Anomaly

August 5 and 6 marked the clearest turning point in the dataset. Rain showers delivered 17.4 mm and 21.4 mm on consecutive days — the first sustained heavy rainfall of the period. Humidity jumped to 81 and 76 percent. Average temperatures fell to 28.6°C and 29.3°C. UV exposure dropped to Moderate on both days, the only time that happened across the entire thirty-day window. This was the monsoon asserting itself, and the meteorological relationships are textbook: rainfall suppresses temperature, raises humidity, and scatters the aerosol load that drives UV penetration and haze formation.

Then came August 16 and 17 — the most dramatic back-to-back days in the dataset. On August 16, Varanasi received 38.3 mm of rain, the single highest daily total of the period. Humidity climbed to 75 percent and average temperature dipped to 29.9°C. The following day, August 17, produced numbers that stand apart from everything else in this dataset: average temperature collapsed to just 21.3°C, the minimum overnight temperature fell to a remarkable 17.4°C, and maximum temperature reached only 29.1°C. These are values more typical of a cold-season morning than a mid-August afternoon in eastern Uttar Pradesh.

Wind played a key role here. August 17 recorded 24.8 km/h gusts — among the stronger readings of the month — suggesting a vigorous low-pressure system or active trough passage. The combination of residual moisture from the previous day's 38.3 mm deluge, sustained winds, and overcast skies produced a genuine cold snap within the monsoon. For Varanasi's outdoor workers, pilgrims, and elderly residents, such a rapid 13-degree swing in average temperature within 24 hours carries real physiological risk.

UV Exposure: An Underreported Risk Across the Month

One of the most consistent and underappreciated findings in this dataset is the persistence of extreme UV exposure. Across 30 days, UV intensity was rated Extreme on 12 days and Very High on 15 days. Only three days — August 5, 6, and 17 — registered Moderate UV, and all three coincided with significant rainfall or cloud cover. Every other day, residents faced Very High or Extreme ultraviolet radiation.

This matters because the partly cloudy conditions that dominated 15 days of the period can create a false sense of protection. Broken cloud cover does not block UV effectively. On days like August 1 and 2, when conditions were logged as Partly Cloudy with Extreme UV, temperatures were above 32°C and humidity sat in the upper 50s — a combination that accelerates heat stress even without direct sunlight. The UV data, read alongside temperature and humidity, paints a picture of compounding physiological stress for anyone spending extended time outdoors.

The smoky haze days add another layer. On July 26 and 27, UV was rated Extreme despite the haze. Certain types of particulate-laden air can scatter rather than absorb UV, meaning haze does not reliably reduce UV exposure. Residents who assumed the grey sky offered protection may have faced higher radiation exposure than they realised.

Late-August Pattern and What It Suggests

The final week of the dataset — August 16 through 22 — shows Varanasi settling into a more consistently active rainfall pattern. Six of the last seven days recorded measurable precipitation, ranging from 2.8 mm to 38.3 mm. Humidity stayed elevated, mostly between 69 and 89 percent. Average temperatures held in the 21–31°C band, well below the 34–35°C peaks of late July.

Crucially, the smoky haze disappeared entirely from August 16 onward. This is consistent with how sustained monsoon rainfall suppresses surface-level particulates — wet deposition removes aerosols, higher humidity limits dust suspension, and stronger winds associated with active weather systems flush out stagnant air masses. The air quality improvement during this final stretch, while not quantified in AQI terms here, can be reasonably inferred from the meteorological conditions alone.

Wind speeds in the closing days were moderate — ranging from 10.8 to 21.6 km/h — and generally declining toward August 22, when winds eased to just 10.8 km/h. Rainfall on August 22 was 9.3 mm with an overcast sky and average temperature of 31.6°C. The net change in average temperature across the full period is +1.8°C, driven largely by the recovery from August 17's anomalous cold rather than any underlying warming signal within the month.

Based on the trajectory of the final ten days — sustained rainfall, elevated humidity, moderate winds, and absent haze — the near-term pattern points toward continued active monsoon conditions through late August. If the rainfall rhythm holds, another dry break similar to August 12–15 remains possible, and with it the risk of haze returning. Residents and health authorities would be well-advised to monitor those transitions closely, as the data shows that even brief breaks in monsoon activity can rapidly degrade air quality in Varanasi's urban environment.

What This Month's Data Means for Varanasi Residents

Taken together, the July 24 to August 22 record offers a clear picture of a city navigating an uneven monsoon. The first ten days were dominated by heat, haze, and suppressed rainfall — conditions that raise AQI, increase UV burden, and strain the city's most vulnerable populations. The middle period brought the monsoon's full force, with the August 16–17 sequence delivering both the heaviest rain and the sharpest temperature drop of the month. The closing days suggest a stabilising but still active rainfall regime.

Three practical takeaways emerge from this weather trend analysis. First, smoky haze in Varanasi is not confined to winter — it reappears during monsoon breaks when heat and calm winds combine, and it carries real air quality implications. Second, UV exposure remains a serious risk throughout the monsoon, even under partly cloudy skies, and the data suggests it is routinely underestimated. Third, the temperature swings recorded this month — particularly the 13°C drop around August 17 — underscore how quickly conditions can shift, demanding flexibility in health advisories and public communication from local authorities.

For a city as dense and outdoor-oriented as Varanasi, where daily life unfolds on the ghats, in the markets, and along the river, these are not abstract meteorological footnotes. They are the lived texture of a monsoon season that has been anything but uniform.