2025-05-01
Widespread rain is expected across most of Thailand over the weekend of April 19-21. In the north, the heat returns with temperatures reaching 37°C in Chiang Rai, while Bangkok struggles with high air pollution despite daily rain. In Phuket, air quality is better, but rainfall is constant throughout the weekend.
Chiang Rai – the heat returns after rain
| Friday, April 19 | AQI 62 – Moderate air quality, high temperature 33°C, low 21°C. Rain 90%. |
| Saturday 20 April | AQI 65 – Moderate air quality, high temperature 35°C, low 20°C. Rain 100%. |
| Sunday, April 21 | AQI 71 – Moderate air quality, highest temperature 37°C, lowest 22°C. Sunny. |
Bangkok – unhealthy air despite persistent rain
| Friday, April 19 | AQI 107 – Unhealthy air, highest temperature 36°C, lowest 25°C. Rain 100%. |
| Saturday 20 April | AQI 94 – Moderate to unhealthy air, high temperature 34°C, low 28°C. Rain 80%. |
| Sunday, April 21 | AQI 75 – Moderate air quality, high temperature 33°C, low 29°C. Rain 100%. |
Phuket – rain every day but better air
| Friday, April 19 | AQI 47 – Good air quality, highest temperature 33°C, lowest 25°C. Rain 100%. |
| Saturday 20 April | AQI 40 – Good air quality, highest temperature 29°C, lowest 25°C. Rain 100%. |
| Sunday, April 21 | AQI 18 – Good air quality, highest temperature 28°C, lowest 23°C. Rain 100%. |
Summary and recommendations
- Chiang Rai: Rain on Friday but very hot on Sunday – up to 37°C. Air quality is moderate all weekend.
- Bangkok: Rain every day but high levels of air pollution – especially on Friday.
- Phuket: Good air quality but rain all weekend. Cooler than the rest of the country.
What does AQI mean?
The AQI (Air Quality Index) shows how healthy the air is. It is mainly based on the amount of PM2.5 particles. Values above 100 are unhealthy for sensitive groups, and above 150 can negatively affect everyone.
| AQI value | Health advice |
|---|---|
| 0–33 | Very good – Enjoy outdoor activities |
| 34–66 | Good – Enjoy outdoor activities |
| 67–99 | Moderate – Avoid strenuous activities if you are sensitive |
| 100–149 | Unhealthy for sensitive groups – Reduce outdoor activities |
| 150–200 | Unhealthy – Everyone should reduce outdoor exertion |
| 200+ | Dangerous – Avoid outdoor physical activity |
Source: IQ Air
Stay informed and protect your health.
Text: The editorial staff
Image license: Mike Behnken, Flickr, original image
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