KOLKATA, July 11 — For all the noise of India’s monsoon season, the salient point for Kolkata tomorrow will be the air itself. According to the India Meteorological Department, the city’s forecast for July 12, 2026 calls for a low of 27°C and a high of 33°C, which notably matches the historical average for July. But it is the humidity figure that catches the eye: 95%, a reading markedly higher than the typical July average of 80-85%.
Kolkata, situated in eastern India, operates under a tropical wet-and-dry climate, classified as Aw on the Köppen system. The monsoon months run from June to September, and July is historically one of the wettest.
The IMD’s long-term data shows average July temperatures hovering between a low of 26°C and a high of 33°C, so tomorrow’s forecast is unremarkable on the thermometer alone. The 95% humidity, however, would seem to push the experience of that temperature into a different register entirely.
Afternoon Thunderstorms
The city typically receives roughly 330 mm of rainfall across July, with overcast skies being a frequent companion. The forecast for July 12 includes a 53% chance of rain around 2 PM, a detail that aligns with the region’s established pattern of afternoon thunderstorm activity during the monsoon. This is not an unusual meteorological event; it is the expected rhythm of a tropical wet season.
But the combination of near-saturation humidity and the likelihood of a midday downpour will make for a heavy, close atmosphere. The 95% humidity figure represents a significant deviation from the norm.
At that level, the air is nearly saturated with moisture. Evaporative cooling — the body’s primary mechanism for regulating heat — becomes inefficient. For residents, this means that a temperature of 33°C will feel considerably more oppressive than the number alone suggests.
It is a detail that the IMD’s forecast captures with precision, and one that distinguishes tomorrow from a typical July day in the city.
Monsoon Norms and Deviations
Kolkata’s monsoon is a well-studied phenomenon. The IMD’s historical records provide a reliable baseline: average July humidity of 80-85%, average rainfall of approximately 330 mm for the month, and frequent overcast conditions. The forecast for July 12 sits within these parameters for temperature and rain probability, but the humidity outlier is worth noting.
Whether this represents a temporary spike or a signal of a wetter-than-usual spell remains to be seen. The 53% chance of rain at 2 PM is consistent with the city’s afternoon thunderstorm climatology.
These storms are a regular feature of the monsoon, often developing as the day heats up and convection increases. The forecast suggests that tomorrow will follow this familiar script, albeit with an unusually moisture-laden atmosphere in the lead-up. For those in Kolkata, the practical implications are straightforward.
The day will be warm, very humid, and likely punctuated by rain in the early afternoon. The combination of high temperature and extreme humidity will make outdoor activity uncomfortable, and the rain, if it arrives, will offer only temporary relief.
The IMD’s data provides a clear picture: a typical monsoon day with an atypical moisture load. What to watch next will be whether the humidity remains elevated in the following days, or whether this is an isolated reading. The monsoon season has several weeks left to run, and Kolkata’s climate is defined by these wet, heavy months.
For now, the forecast for July 12 is a precise snapshot of a city in the grip of its annual rainy season, with one number — 95% — standing out from the historical record.
