Weather forecast from the Meteorological Department Thailand will experience thunderstorms in some areas, with heavy rain in parts of the northern region. Bangkok and its vicinity have a 30% chance of thunderstorms, mostly between afternoon and evening.
On 21 July 2026, the Meteorological Department's website issued a daily weather forecast stating that Thailand will have thunderstorms in some areas and heavy rain in parts of the north due to the strengthening southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand. Residents in the northern region are advised to be cautious of dangers from heavy and accumulated rain.
Wind and waves in the upper Andaman Sea and upper Gulf of Thailand are moderate, with waves 1-2 meters high. The lower Andaman Sea has waves about 1 meter high. Areas experiencing thunderstorms have waves exceeding 2 meters. Mariners are advised to navigate with caution and avoid sailing in areas with thunderstorms.
From 06:00 today until 06:00 tomorrow
Northern region
Thunderstorms cover 60% of the area, with heavy rain in some parts of Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Lamphun, Lampang, and Tak provinces. Minimum temperatures range from 21-27°C, maximum 28-34°C. Winds from the southwest at 10-20 km/h.
Northeastern region
Thunderstorms cover 30% of the area, mainly in Loei, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, and Nakhon Ratchasima provinces. Minimum temperatures 23-25°C, maximum 32-37°C. Winds from the southwest at 10-20 km/h.
Central region
Thunderstorms cover 30% of the area, mainly in Kanchanaburi, Uthai Thani, Nakhon Sawan, Lopburi, and Saraburi provinces. Minimum temperatures 23-26°C, maximum 33-37°C. Winds from the southwest at 10-20 km/h.
Eastern region
Thunderstorms cover 30% of the area, mainly in Nakhon Nayok, Prachinburi, Rayong, Chanthaburi, and Trat provinces. Minimum temperatures 23-28°C, maximum 33-37°C. Winds from the southwest at 15-35 km/h. Sea waves 1-2 meters high; in areas with thunderstorms, waves exceed 2 meters.
Southern region (west coast)
Thunderstorms cover 40% of the area, mainly in Phuket, Krabi, Trang, and Satun provinces. Minimum temperatures 23-25°C, maximum 32-34°C. From Phang Nga northward: Winds from the southwest at 15-35 km/h, sea waves 1-2 meters high; in thunderstorm areas, waves exceed 2 meters. From Phuket southward: Winds from the southwest at 15-30 km/h, sea waves about 1 meter high; in thunderstorm areas, waves exceed 2 meters.
Bangkok and vicinity
Thunderstorms cover 30% of the area, mostly between afternoon and evening. Minimum temperatures 27-28°C, maximum 34-37°C. Winds from the southwest at 10-20 km/h.