IMD’s October 18 afternoon forecast puts Bengaluru Rural, Chikkaballapura, Kodagu, Kolar and Tumakuru in the very-heavy-rain category. Bengaluru Urban is listed for heavy rain. The new district bulletin applies from 1 pm IST on October 18 until 8:30 am on October 19.
This is a changed outlook from the October 17 bulletin, which had placed both Bengaluru districts in the light-to-moderate category for Sunday. For an afternoon or evening journey, the newer issue changes the relevant starting point: the district name, issue time and validity window need to be read together.
Updated window: 18 October 1 pm–19 October 8:30 am IST
| Districts | Rain category |
|---|---|
| Bengaluru Rural, Chikkaballapura, Kodagu, Kolar, Tumakuru | Very heavy |
| Bengaluru Urban, Chamarajanagar, Chikkamagaluru, Hassan, Mandya, Mysuru, Ramanagara, Dakshina Kannada | Heavy |
| Udupi, Uttara Kannada | Light to moderate; thunderstorms possible |
IMD bulletin issued 18 October at 1 pm IST. Forecast categories, not rain measured at every address. Other districts are listed in the full official table.
Where the heavier rain is forecast
The accompanying table separates the five very-heavy-rain districts from eight districts listed for heavy rain. The latter include Bengaluru Urban and Dakshina Kannada on the coast. Udupi and Uttara Kannada remain in the light-to-moderate category, with thunderstorms possible.
IMD’s legend defines heavy rain as 64.5–115.5 mm and very heavy rain as 115.6–204.4 mm. The south-interior warning describes the heaviest rain as likely at one or two places. These are forecast categories; they do not mean every neighbourhood will receive the same amount.
What changed, and what remains uncertain
The newer district matrix does not explain the meteorological reason for each revision. The daily weather report available when this article was checked still carried October 17’s date. Its older district outlook is therefore not used to override the October 18 matrix, or to claim a newly verified cause for the change.
Rain intensity and rain coverage are different measures. A district can have widespread rain while only some places experience the strongest spells. The updated bulletin also includes thunderstorms and gusts of 30–40 km/h in south-interior Karnataka. Neither the rainfall table nor those wind figures establish current flooding, road closures or school closures.
Use the latest district warning before travelling
Open the IMD Bengaluru district-nowcast link below before leaving, then check local traffic advice for the actual route. IMD’s published precautions advise shelter during lightning and thunderstorms and avoiding waterlogged areas and river fronts. The daily report is used here for those precautions, with its October 17 date stated, rather than as the latest district forecast.
For Sunday afternoon, Bengaluru’s earlier light-to-moderate outlook is no longer the correct district summary: Rural is very heavy and Urban is heavy in the 1 pm update. The useful next check is a newer bulletin or nowcast for the specific district. That keeps the latest forecast distinct from conditions already observed on a particular street.
Updated before publication using IMD Bengaluru’s 18 October 2026 district bulletin. The 17 October daily report is identified separately; forecasts can change.
- IMD Bengaluru district forecast, issued 18 October at 13:00 IST ↗
- IMD Bengaluru daily weather report, 17 October ↗
- IMD Bengaluru official forecast and nowcast entry ↗
- IMD district nowcast for Karnataka ↗