September weather forecast
Chiang Rai, Thailand

Transitioning from August, September in Chiang Rai sees a decline in rainfall rates to 284mm (11.18"). The month ushers in a decrease in daylight hours, giving way to soothing and calm evenings. Equally matched by less humidity and rather mild temperatures, the pleasant weather makes outdoor pursuits enjoyable. As the city inches towards the end of the rain season, the landscapes radiates rejuvenated beauty. September can be enchanting for nature lovers.

Temperature

Chiang Rai greets September with an average high-temperature of a still tropical 31.1°C (88°F), marking a slight deviation from the preceding month. During September, an average low-temperature of 22.7°C (72.9°F) is observed.

Heat index

September's heat index is computed to be an extremely hot 42°C (107.6°F). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', comes about by integrating the temperature readings with the humidity levels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in September is 83%.

Rainfall

In Chiang Rai, during September, the rain falls for 18 days and regularly aggregates up to 284mm (11.18") of precipitation. In Chiang Rai, during the entire year, the rain falls for 137 days and collects up to 1691mm (66.57") of precipitation.

Daylight

In Chiang Rai, the average length of the day in September is 12h and 16min.
On the first day of September, sunrise is at 06:05 and sunset at 18:36. On the last day of the month, sunrise is at 06:11 and sunset at 18:09 +07.

Sunshine

In Chiang Rai, the average sunshine in September is 6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: During September, 12 as the daily maximum UV index converts into the following advice:
Adopt all essential precautions. Preventing sun harm is crucial. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. One must apply and reapply generously an SPF 30+ broad-spectrum sunscreen every two hours or after an outdoor workout or swim.