By Team INVC | INVC NEWS
NEW DELHI, India | September 18, 2026 —
Weather Today September 18 2026 is bringing sharply different conditions across India, with heavy rain and thunderstorms threatening several regions while Delhi and parts of northwest India begin Friday without an official weather warning.
The India Meteorological Department has placed parts of Bihar, East Rajasthan, Sub-Himalayan West Bengal and Sikkim, and Tamil Nadu-Puducherry under heavy-rain warnings for Friday.
Thunderstorms, lightning and gusty winds may also affect several other regions, including Uttarakhand, Gujarat, Telangana, interior Karnataka and parts of eastern India.
Delhi, however, has no IMD subdivision warning for September 18. The capital is expected to remain warm and partly sunny, with temperatures hovering around the low-30s Celsius during the day.
Bihar Faces Heavy Rain and Thunderstorm Risk
Bihar remains one of the important weather zones to watch today.
The IMD has issued a heavy-rain warning for the state along with the possibility of thunderstorms and lightning.
Residents should remain cautious during intense spells of rain, particularly in low-lying locations where waterlogging can develop quickly.
People travelling during thunderstorms should also avoid taking shelter under isolated trees or near exposed electrical structures.
Heavy Rain Alert for East Rajasthan
East Rajasthan is another region facing an active weather day.
Heavy rainfall, thunderstorms and lightning remain possible across parts of the region.
West Rajasthan may also experience thunderstorm and lightning activity, although the official warning does not indicate the same heavy-rain risk as eastern areas.
The weather comes just as attention begins turning toward the eventual withdrawal of the southwest monsoon from northwest India.
West Bengal and Sikkim Under Rain Watch
Sub-Himalayan West Bengal and Sikkim are under a heavy-rain warning for Friday.
Thunderstorms and lightning may accompany the rainfall in some areas.
Gangetic West Bengal could also see thunderstorm activity, though the warning pattern differs from the heavier rainfall risk in the northern part of the state.
Persistent rain could temporarily affect road movement and local travel in vulnerable areas.
Tamil Nadu and Puducherry Enter Longer Wet Spell
Tamil Nadu and Puducherry stand out because the rain risk is not limited to Friday.
IMD warnings indicate the possibility of heavy rainfall along with thunderstorms and lightning beginning September 18 and continuing through the coming days.
People across rain-prone districts should therefore keep an eye on local forecasts rather than relying only on a national-level outlook.
Conditions can change rapidly during thunderstorm activity, especially during the afternoon and evening.
Delhi Weather Today: Warm Day, No Official Warning
Delhi is beginning September 18 on a much calmer note.
The capital has no IMD subdivision warning for today.
Current forecasts indicate partly sunny conditions, with the maximum temperature expected around 33°C and the minimum near 25°C.
Humidity may still make the weather feel uncomfortable at times.
Rain chances are expected to become more noticeable over the weekend, with isolated thunderstorm activity possible on Saturday.
Uttarakhand Could See Thunderstorms and Lightning
Uttarakhand has a thunderstorm and lightning warning for September 18.
Although widespread heavy rainfall is not listed in the same category as some eastern and southern regions, sudden local storms may still create hazardous conditions.
People travelling in mountainous areas should remain alert to rapidly changing weather and reduced visibility.
Gujarat Could See Thunderstorm Activity
Both the Gujarat region and Saurashtra-Kutch face thunderstorm and lightning warnings today.
Rain intensity can vary sharply from one district to another during such weather systems.
Local forecasts and short-term IMD nowcasts will therefore be particularly important for residents and travellers.
Telangana and Karnataka Also on Weather Watch
Thunderstorm and lightning activity may affect Telangana today.
Interior Karnataka also faces similar conditions, while coastal Karnataka does not carry the same warning for September 18.
Rainfall activity across parts of southern India is expected to become more active over the next few days.
Monsoon Withdrawal Now in Focus
The southwest monsoon is approaching an important transition phase.
Weather conditions over northwest India are gradually moving toward the period when monsoon withdrawal normally begins.
However, withdrawal does not mean rain will immediately disappear across the country.
Eastern, southern and some central regions can continue to receive significant rainfall even as the monsoon starts retreating from northwest India.
What People Should Watch Today
Heavy rain can create short-duration flooding, traffic disruption and reduced visibility.
Thunderstorms can also bring sudden strong winds and dangerous lightning.
Residents in affected areas should follow local IMD nowcasts, avoid flooded roads and stay away from open areas during lightning activity.
Weather conditions may change considerably between districts, so city-level forecasts remain more useful for immediate travel decisions than broad state-level predictions.
