2025-05-09
The weekend of May 9-11, 2025, offers stark contrasts in weather across Thailand. In Chiang Rai, temperatures will reach a high of 41°C on Saturday, while Bangkok will see rain every day and high levels of air pollution. In Phuket, rain is expected to continue, but the air will be significantly cleaner.
Chiang Rai – High heat and rising air pollution
| Friday 9 May | AQI 79 – Moderate air quality, highest temperature 38°C, lowest 22°C. Sunny. |
| Saturday 10 May | AQI 87 – Moderate air quality, high 41°C, low 24°C. Partly cloudy. |
| Sunday 11 May | AQI 93 – Moderate air quality, high temperature 36°C, low 21°C. Rain 100%. |
Bangkok – Air pollution and heavy rain
| Friday 9 May | AQI 63 – Moderate air quality, high temperature 36°C, low 29°C. Rain 20%. |
| Saturday 10 May | AQI 70 – Moderate air quality, high temperature 37°C, low 28°C. Rain 100%. |
| Sunday 11 May | AQI 76 – Moderate air quality, high temperature 30°C, low 24°C. Rain 100%. |
Phuket – Humid but better air
| Friday 9 May | AQI 58 – Moderate air quality, high temperature 31°C, low 25°C. Rain 100%. |
| Saturday 10 May | AQI 48 – Good air quality, highest temperature 29°C, lowest 27°C. Rain 100%. |
| Sunday 11 May | AQI 63 – Moderate air quality, high temperature 29°C, low 27°C. Rain 100%. |
Summary and recommendations
- Chiang Rai: Temperatures will reach 41°C on Saturday - avoid outdoor physical activity. Air quality is moderate but will deteriorate by Sunday.
- Bangkok: High humidity, heat and moderate to unhealthy air. Heavy rain every day can help reduce pollution.
- Phuket: Continued rain but good air quality, especially on Saturday - best choice for sensitive groups.
What does AQI mean?
The AQI (Air Quality Index) shows how healthy or unhealthy 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: Jeff Gunn, Flickr, original image
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