September weather forecastChengmai, China
September
Weather in September
The first month of the autumn, September, is still a hot month in Chengmai, China, with temperature in the range of an average low of 26.1°C (79°F) and an average high of 30.5°C (86.9°F).Temperature
The onset of September brings an average high-temperature of a still hot 30.5°C (86.9°F), nearly matching the August temperature. During the month of September, Chengmai identifies an average nighttime low-temperature of 26.1°C (79°F), slightly lower than its daytime counterpart.Heat index
The heat index value for September is estimated at a very hot 39°C (102.2°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.Heat index guidelines indicate values are for light wind scenarios and shaded regions. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. 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. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful 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.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.
Humidity
The average relative humidity in September is 80%.Rainfall
In Chengmai, during September, the rain falls for 18.3 days and regularly aggregates up to 115mm (4.53") of precipitation. Throughout the year, there are 202.3 rainfall days, and 810mm (31.89") of precipitation is accumulated.Daylight
In Chengmai, China, 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, sunrise is at 06:30 and sunset at 18:29 CST.
Sunshine
In September, the average sunshine is 8.3h.UV index
The months with the highest UV index in Chengmai are April through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the UV index of 7 transforms into the following advice:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chengmai, China
- Average high temperature in September: 30.5°C
The warmest month (with the highest average high temperature) is June (32.4°C).
The month with the lowest average high temperature is January (21.1°C).
- Average low temperature in September: 26.1°C
The months with the highest average low temperature are June and July (26.8°C).
The coldest month (with the lowest average low temperature) is January (17.6°C).
Average pressure in September
Chengmai, China
- Average pressure in September: 1007.7mbar
The month with the highest atmospheric pressure is January (1018.5mbar).
The month with the lowest atmospheric pressure is July (1004.2mbar).
Average wind speed in September
Chengmai, China
- Average wind speed in September: 12.8km/h
The windiest month (with the highest average wind speed) is December (17.1km/h).
The calmest month (with the lowest average wind speed) is August (11.4km/h).
Average humidity in September
Chengmai, China
- Average humidity in September: 80%
The months with the highest relative humidity are January, February and April (82%).
The months with the lowest relative humidity are June, July, October and December (78%).
Average rainfall in September
Chengmai, China
- Average rainfall in September: 115mm
The wettest month (with the highest rainfall) is August (136mm).
The driest month (with the least rainfall) is February (15mm).
Average rainfall days in September
Chengmai, China
- Average rainfall days in September: 18.3 days
The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is February (11.9 days).
Average daylight in September /
Average sunshine in September
Chengmai, China
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The months with the least sunshine are January, November and December (Average sunshine: 4h and 54min).
Average sunshine days in September
Chengmai, China
- Average sunshine days in September: 10.3 days
The month with the most sunshine days is March (14.9 days).
The month with the least sunshine days is August (7.5 days).
Average UV index in September
Chengmai, China
- Average UV index in September: 7
The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 5).
Average cloud cover in September
Chengmai, China
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are May and June (Cloud cover 32).
Average visibility in September
Chengmai, China
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March and April (9km).
