Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
The onset of September brings an average high-temperature of a still tropical 34.4°C (93.9°F), nearly matching the August temperature. In September, the temperature registers a significant dip to an average of 20.5°C (68.9°F) at night.Heat index
In September, the average heat index is calculated to be an extremely hot 40°C (104°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.One should consider that heat index numbers are for shaded settings and light wind. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.
Humidity
The average relative humidity in September in Valle de San Juan is 52%.Rainfall
In Valle de San Juan, in September, it is raining for 17.4 days, with typically 56mm (2.2") of accumulated precipitation. Throughout the year, there are 211.1 rainfall days, and 802mm (31.57") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 8min.On the first day of September, sunrise is at 05:54 and sunset at 18:06. On the last day of the month, sunrise is at 05:47 and sunset at 17:52 -05.
Sunshine
In Valle de San Juan, the average sunshine in September is 10.3h.UV index
January through April, July through October, with an average maximum UV index of 7, are months with the highest UV index in Valle de San Juan. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How much does it rain in September?
How many hours of daylight does Valle de San Juan have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the month with the highest UV index?
What is the UV index intensity in September?
Average temperature in September
Valle de San Juan, Colombia
- Average high temperature in September: 34.4°C
The warmest month (with the highest average high temperature) is February (35.5°C).
The month with the lowest average high temperature is June (32.5°C).
- Average low temperature in September: 20.5°C
The month with the highest average low temperature is August (21.2°C).
The coldest month (with the lowest average low temperature) is December (18°C).
Average pressure in September
Valle de San Juan, Colombia
- Average pressure in September: 1014.4mbar
The month with the highest atmospheric pressure is July (1015.2mbar).
The month with the lowest atmospheric pressure is November (1012.8mbar).
Average wind speed in September
Valle de San Juan, Colombia
- Average wind speed in September: 5.7km/h
The windiest months (with the highest average wind speed) are July and August (7.1km/h).
The calmest month (with the lowest average wind speed) is November (3.6km/h).
Average humidity in September
Valle de San Juan, Colombia
- Average humidity in September: 52%
The month with the highest relative humidity is November (65%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
Valle de San Juan, Colombia
- Average rainfall in September: 56mm
The wettest month (with the highest rainfall) is October (109mm).
The driest month (with the least rainfall) is January (37mm).
Average rainfall days in September
Valle de San Juan, Colombia
- Average rainfall days in September: 17.4 days
The month with the highest number of rainy days is May (23.4 days).
The month with the least rainy days is January (10.5 days).
Average daylight in September /
Average sunshine in September
Valle de San Juan, Colombia
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 54min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 8h and 24min).
Average sunshine days in September
Valle de San Juan, Colombia
- Average sunshine days in September: 7.7 days
The month with the most sunshine days is January (14.1 days).
The month with the least sunshine days is May (2.4 days).
Average UV index in September
Valle de San Juan, Colombia
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, July, August, September and October (UV index 7).
The months with the lowest UV index are May, June, November and December (UV index 6).
Average cloud cover in September
Valle de San Juan, Colombia
- Average cloud cover in September: 26
The month with the most cloud cover is May (Cloud cover 33).
The month with the least cloud cover is January (Cloud cover 22).
Average visibility in September
Valle de San Juan, Colombia
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August and September (10km).
The months with the lowest visibility are October, November and December (9km).
