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 in Chiang Rai can be enchanting for nature lovers.

Temperature

The initiation of September records an average high-temperature of a still tropical 31.1°C (88°F), displaying a near consistency with the previous month. During September, the temperature in Chiang Rai is averaged to a low of 22.7°C (72.9°F) at night.

Heat index

In September, the average heat index is estimated at a scorching 42°C (107.6°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', measures the perceived warmth when incorporating the humidity present in the air. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in September is 83%.

Rainfall

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

Sunshine

In September, the average sunshine 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 reading of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 12 during September leads to these instructions:
Utilize all necessary safety measures, unprotected skin could suffer burns instantly. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Post an outdoor workout or swimming, a broad-spectrum SPF 30+ sunscreen should be applied generously and frequently.