Thailand's weather service warns of heavy rain from 9 to 13 October across the Central, East and South

The Thai Meteorological Department (TMD) issued Warning No. 5 (advisory 251/2026) at 5 am Thai time on 9 October 2026, alerting the country to a five-day spell of unsettled weather. Isolated heavy to very heavy rain is expected in parts of Thailand from 9 to 13 October, together with thundershowers, gusty winds and hail. The Nation reported the warning on the morning of 9 October.

The forecast is set out day by day. On 9 October the rain is expected in the eastern Northeast, the East and the South. On 10 October the zone widens to the lower North, the lower Northeast, the Central region including Bangkok and surrounding areas, the East and the South. On 11 October the lower North, the Central region including Bangkok, the East and the South are covered. On 12 and 13 October the warning narrows to the South.

The TMD ties the conditions to the late rainy season. A high-pressure system, or cool air mass, is extending from China over upper Thailand, a monsoon trough is expected across the upper South, and the southwest monsoon continues over the Andaman Sea, southern Thailand and the Gulf of Thailand.

The department names flash floods and sudden run-off as the main risk, especially on foothill slopes near waterways and in low-lying areas, where standing water may form. For people outdoors, its advice is simple: stay alert to thundershowers and gusty winds, avoid open spaces, do not shelter under large trees and keep away from unstable billboards. Daily plans and travel between 9 and 13 October should be made carefully, with an eye on further announcements.

At sea, mariners are asked to check their routes, sail cautiously and avoid thundershowers. Waves in the Andaman Sea and the Gulf of Thailand could rise above two metres in affected areas. Anyone planning a boat day or an island crossing should check conditions with the operator before setting out.

For visitors this is the tail of the rainy season, and many are arriving for the start of high season. A few wet days change the choice of vehicle and route. Wet roads lengthen braking distances, and a scooter in gusty wind or a downpour asks more of the rider than on a dry afternoon. Some travellers will shift a ride to another day, shorten the route or pick a car instead.

Balm Rentals is a marketplace that brings bikes, scooters and cars from licensed local owners into one app for iOS and Android and on the web, in the traveller's own language. Price, deposit and rental terms are shown before payment, so a visitor deciding between a scooter and a car for a wet few days can compare them calmly and choose what suits the conditions. The service is meant to sit alongside local rental owners and the wider industry effort to make tourist services clearer and easier to use.

The TMD publishes updates on its website and by phone at 02-399-4012, 02-399-4013 and 1182, and its next advisory was scheduled for 5 pm Thai time on 9 October. Before renting any vehicle, check the latest forecast, the local driving rules and the licence required for the vehicle type.