Upper Thailand set to cool as heavy rain is expected in parts of South
Bangkok can expect thundershowers and gusty winds, while heavy to very heavy rain could trigger flash floods and landslides in southern Thailand.
- Upper Thailand is expected to cool down on November 19-20, with temperatures falling by 1-4°C due to a high-pressure system from China.
- In Southern Thailand, a strengthening northeast monsoon will cause increased rainfall from November 18-20, with isolated heavy to very heavy rain expected.
- Residents in the South are warned of potential flash floods and landslides between November 18-20 because of the forecast heavy rain.
The Thai Meteorological Department has issued its seven-day weather outlook for Saturday (November 14, 2026) to Friday (November 20, 2026).
Upper Thailand
Temperatures will rise, with morning fog and isolated thundershowers, on November 14–16, as the high-pressure system bringing cool air to upper Thailand weakens. Easterly and southeasterly winds will carry moisture into the lower Northeast, the East and the Central region, including Bangkok and surrounding provinces.
Thundershowers will initially increase, with gusty winds in some areas, on November 17–18. Temperatures will then fall on November 19–20, as a fresh high-pressure system bringing cold air from China spreads over upper Thailand.
Southern Thailand
Rainfall will decrease on November 14–17 as the northeast monsoon over the Gulf of Thailand, the South and the Andaman Sea weakens, although isolated heavy rain will persist. Waves in the Andaman Sea and the Gulf will be about 1 metre high, exceeding 2 metres in thundershowers.
Rainfall will increase, with isolated heavy to very heavy rain, on November 18–20, as the northeast monsoon strengthens over the Gulf, the South and the Andaman Sea. Moderate winds and waves are expected in the lower Gulf, with waves about 2 metres high and exceeding 2 metres in thundershowers.
Precautions: Southern residents should watch for flash floods, torrents of water from higher ground and landslides on November 18–20, particularly on foothill slopes near waterways and in low-lying areas, because of heavy to very heavy rain and accumulated rainfall. Mariners in the Gulf and the Andaman Sea should check their routes, navigate cautiously and avoid areas experiencing thundershowers throughout the outlook period.
Regional outlook
North
- Cool mornings with fog are expected on November 14–16, with temperatures rising by 1–3°C and rain in some areas. Southeasterly winds will reach 10–20 km/h. Minimum temperatures will be 18–25°C and maximums 27–35°C. Mountain summits will be cool to cold, with lows of 10–15°C.
- Thundershowers will cover 30–40% of the region on November 17–18, with easterly winds of 10–20 km/h. Minimum temperatures will be 21–26°C and maximums 30–36°C. Mountain summits will be cool to cold, with lows of 12–17°C.
- Cool mornings are expected on November 19–20, with temperatures falling by 1–2°C and rain in some areas. Northeasterly winds will reach 10–20 km/h. Minimum temperatures will be 18–25°C and maximums 28–33°C. Mountain summits will be cool to cold, with lows of 11–16°C.
Northeast
- Cool mornings with light mist are expected on November 14–16, with temperatures rising by 1–3°C and rain in some areas. Southeasterly winds will reach 10–20 km/h. Minimum temperatures will be 20–24°C and maximums 30–34°C. Mountain summits will be cool to cold, with lows of 11–17°C.
- Thundershowers will cover 20–40% of the region on November 17–18, with gusty winds in some areas. Easterly winds will reach 10–20 km/h. Minimum temperatures will be 22–25°C and maximums 32–35°C. Mountain summits will be cool to cold, with lows of 12–18°C.
- Cool mornings are expected on November 19–20, with temperatures falling by 2–4°C. Northeasterly winds will reach 10–30 km/h. Minimum temperatures will be 19–23°C and maximums 28–33°C. Mountain summits will be cool to cold, with lows of 10–16°C.
Central region
- Cool mornings with light mist are expected on November 14–16, with temperatures rising by 1–2°C. Thundershowers will cover 10–20% of the region.
- Thundershowers will cover 30–40% of the region on November 17–18, with gusty winds in some areas. Southeasterly winds will reach 10–20 km/h. Minimum temperatures will be 22–26°C and maximums 32–36°C.
- Cool mornings are expected on November 19–20, with temperatures falling by 1–3°C. Northeasterly winds will reach 10–25 km/h. Minimum temperatures will be 20–25°C and maximums 30–35°C.
East
- Cool mornings with light mist are expected on November 14–18, with temperatures rising by 1–2°C and thundershowers covering 20–40% of the region. Southeasterly winds will reach 15–30 km/h. Waves will be below 1 metre, about 1 metre offshore and above 2 metres in thundershowers. Minimum temperatures will be 23–27°C and maximums 32–36°C.
- Cool mornings are expected on November 19–20, with temperatures falling by 1–3°C. Easterly winds will reach 15–35 km/h. Waves will be about 1 metre high, reaching 1–2 metres offshore and exceeding 2 metres in thundershowers. Minimum temperatures will be 22–26°C and maximums 31–34°C.
South (east coast)
- Thundershowers will cover 40–60% of the region, with isolated heavy rain, on November 14–17. Easterly winds will reach 15–30 km/h. Waves will be about 1 metre high, exceeding 2 metres in thundershowers.
- Thundershowers will cover 60–70% of the region, with isolated heavy to very heavy rain, on November 18–20. From Surat Thani province northwards, northeasterly winds will reach 15–35 km/h, with waves of 1–2 metres and above 2 metres in thundershowers.
- From Nakhon Si Thammarat province southwards, easterly winds will reach 20–35 km/h. Waves will be about 2 metres high, exceeding 2 metres in thundershowers. Minimum temperatures will be 21–26°C and maximums 29–34°C.
South (west coast)
- Thundershowers will cover 40–60% of the region, with isolated heavy rain, on November 14–17. Southwesterly winds will reach 15–30 km/h. Waves will be about 1 metre high, exceeding 1 metre offshore and 2 metres in thundershowers.
- Thundershowers will cover 60–70% of the region, with isolated heavy rain, on November 18–20. Easterly winds will reach 15–35 km/h. Waves will be about 1 metre high, reaching 1–2 metres offshore and exceeding 2 metres in thundershowers. Minimum temperatures will be 22–26°C and maximums 29–35°C.
Bangkok and surrounding provinces
- Thundershowers will cover 10–30% of the area on November 14–16, with southeasterly winds of 10–20 km/h.
- Thundershowers will cover 20–40% of the area on November 17–18, with gusty winds in some areas.
- Cool mornings are expected on November 19–20, with temperatures falling by 1–2°C. Easterly winds will reach 10–25 km/h. Minimum temperatures will be 22–26°C and maximums 32–35°C.
