Weather tomorrow

"Chance of rain" is not how much of the day it rains

A 40% chance of rain means that, in weather set-ups like tomorrow's, measurable rain (at least about 0.1 mm) falls at any given spot in roughly 4 cases out of 10. It says nothing about how long or how hard. A 30% chance of a heavy afternoon thunderstorm and a 90% chance of drizzle are very different days — so read the chance together with the amount expected.

Tomorrow's low usually happens early, not at night

The day's minimum temperature typically comes just around sunrise, after a night of losing heat to a clear sky; the maximum comes in mid-afternoon, not at noon, because the ground keeps warming after the Sun is highest. If you leave home at 6 am, dress for the low. Clouds overnight keep the low up; a clear, calm night drops it further.

Wind: average versus gusts

Forecasts usually give the sustained wind — the average over several minutes at 10 m above open ground. Gusts can be 50% stronger or more, especially in thunderstorms and between tall buildings. Above about 40 km/h, cycling and umbrellas become hard work.

UV index

The UV index runs from 0 upwards: 3–5 is moderate, 6–7 high, 8–10 very high and 11+ extreme. Across much of India it reaches 8–11 at midday for most of the year, even on hazy days — cloud and haze cut heat more than they cut UV.

Very — tomorrow is the forecast meteorologists get right most often. Modern global and regional models are re-run several times a day from fresh satellite, balloon, aircraft and ground observations, and next-day temperature forecasts are typically within a couple of degrees. Accuracy falls off steadily after about five days, and anything beyond ten days is closer to a seasonal average than a forecast.

The hard part is not whether it rains but exactly where and when. A line of monsoon or summer thunderstorms may be forecast correctly for a region yet miss one neighbourhood entirely. That's why the chance of rain often moves around overnight: check tomorrow's forecast again in the morning, when the models have had one more update.

The forecast on this page comes from Open-Meteo, which blends output from national weather services' models (including Germany's DWD, NOAA in the US and ECMWF) and picks the best-resolution model for each place. For official warnings — cyclones, heatwaves, heavy rain — always follow your national weather service, such as the India Meteorological Department.