Bangalore weather on 20 September 2026: rain, wind and what the forecast really says
Bengaluru’s forecast is not simply getting warmer: rain and thundershowers remain in view, while the forecast wind band changes after 21 September.
The useful answer is not just the temperature
For Bangalore weather on 20 September 2026, the official answer is a rain-and-wind forecast rather than a dry temperature story. The India Meteorological Department’s Meteorological Centre Bengaluru issued its district forecast at 1:00 pm IST. For Bengaluru Urban, it listed generally cloudy conditions, light to moderate rain or thundershowers, rain that could be heavy at times, and gusty winds of 40–50 km/h. The forecast high was 28°C and the low was 21°C. IMD district forecast
That wording matters more than the high temperature. A 28°C forecast does not, by itself, describe a dry or settled day when the same entry includes thundershowers and gusty winds.
The five-day picture is not a simple warming trend
The forecast for 21 September keeps the generally cloudy, rain-and-thundershower wording, including rain that could be heavy at times. It gives a high of 30°C, a low of 21°C, and gusty winds of 40–50 km/h.
From 22 to 24 September, the forecast still says generally cloudy with light to moderate rain or thundershowers. The wind entry moves to 30–40 km/h. The listed highs are 31°C, 32°C and 32°C, while the lows are 21°C, 21°C and 22°C respectively. The phrase rain that could be heavy at times appears in the 20 and 21 September entries, not in the entries for 22 to 24 September.
This is a change in the forecast wording, not a promise that the later days will be dry. The useful reading is: temperatures rise, the forecast wind band becomes lower, but cloudy and rainy conditions remain in the outlook.
Why one Bangalore weather number can mislead
The IMD’s Urban Meteorological Services page shows separate readings for Bengaluru-City and Bengaluru HAL. The page listed 23.6°C at both locations, but the accompanying readings differed: Bengaluru-City had westerly wind at 5.6 km/h and relative humidity of 86%, while Bengaluru HAL had west-northwesterly wind at 14.8 km/h and relative humidity of 79%.
The same temperature at two stations does not mean the complete weather picture is identical. It is a useful reminder to distinguish an area forecast from a measurement at a named station.
The latest 8:30 am IST report on the IMD weather report page recorded a Bengaluru-City maximum of 31.2°C, a minimum of 20.4°C and 16 mm of rainfall for the preceding reporting period. That report answers what was recorded; the district forecast answers what was expected across the forecast dates. Neither should be read as a replacement for the other.
A better way to read the forecast before making plans
Start with the date, then read the rain and wind wording alongside the temperature. For present conditions, use the station-specific Bengaluru-City or HAL reading. For the next few days, use the district forecast and note whether the wording includes rain that could be heavy at times, as well as the stated wind band.
For Bengaluru on 20 September, the practical conclusion is conditional: rain and thundershowers remain part of the forecast through 24 September, the strongest stated wind band is on 20 and 21 September, and the later entries still do not describe settled dry weather. The number at the top of a weather card is only one part of the answer.