September weather forecast
Chengmai, China

The first month of the autumn, September, is still a tropical month in Chengmai, China, with an average temperature varying between 30.5°C (86.9°F) and 26.1°C (79°F).

Temperature

Chengmai's weather, upon September's arrival, documents an average high-temperature of a still hot 30.5°C (86.9°F), nearly identical to the prior month. In September, Chengmai experiences a marginal drop in temperature, with averages of 26.1°C (79°F) at night.

Heat index

In September, the average heat index is evaluated at a fiery hot 39°C (102.2°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

The average relative humidity in September in Chengmai is 80%.

Rainfall

In Chengmai, in September, during 18.3 rainfall days, 115mm (4.53") of precipitation is typically accumulated. In Chengmai, during the entire year, the rain falls for 202.3 days and collects up to 810mm (31.89") of precipitation.

Daylight

In Chengmai, the average length of the day in September is 12h and 16min.
On the first day of the month, sunrise is at 06:24 and sunset at 18:55. On the last day of September, in Chengmai, sunrise is at 06:30 and sunset at 18:29 CST.

Sunshine

The average sunshine in September in Chengmai is 8.3h.

UV index

The months with the highest UV index are April through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.