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
September's advent notes a subtle adjustment in average high-temperature to a still tropical 30.1°C (86.2°F) from August. San Felipe witnesses an average low-temperature of 21.4°C (70.5°F) throughout the month of September.Heat index
September's mean heat index is calculated to be a torrid 37°C (98.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.Understanding the heat index involves considering values for shaded locales with light wind. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
In San Felipe, Guatemala, the average relative humidity in September is 77%.Rainfall
In San Felipe, in September, during 27.5 rainfall days, 159mm (6.26") of precipitation is typically accumulated. In San Felipe, during the entire year, the rain falls for 222.6 days and collects up to 1301mm (51.22") of precipitation.Daylight
The average length of the day in September is 12h and 13min.On the first day of September in San Felipe, sunrise is at 05:54 and sunset at 18:17. On the last day of the month, sunrise is at 05:55 and sunset at 17:56 CST.
Sunshine
In San Felipe, the average sunshine in September is 10.9h.UV index
The months with the lowest UV index are January, May, June, August through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 6 in September translates into the following instructions:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How much does it rain in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September in San Felipe?
When is the lowest UV index in San Felipe?
What is the UV index intensity in September?
Average temperature in September
San Felipe, Guatemala
- Average high temperature in September: 30.1°C
The warmest month (with the highest average high temperature) is April (32.5°C).
The month with the lowest average high temperature is October (29.8°C).
- Average low temperature in September: 21.4°C
The month with the highest average low temperature is May (22.7°C).
The coldest month (with the lowest average low temperature) is December (19.5°C).
Average pressure in September
San Felipe, Guatemala
- Average pressure in September: 1012.3mbar
The month with the highest atmospheric pressure is January (1014.3mbar).
The month with the lowest atmospheric pressure is October (1012mbar).
Average wind speed in September
San Felipe, Guatemala
- Average wind speed in September: 5.5km/h
The windiest month (with the highest average wind speed) is March (6.7km/h).
The calmest months (with the lowest average wind speed) are May, June, September and October (5.5km/h).
Average humidity in September
San Felipe, Guatemala
- Average humidity in September: 77%
The month with the highest relative humidity is October (78%).
The months with the lowest relative humidity are January, February and March (59%).
Average rainfall in September
San Felipe, Guatemala
- Average rainfall in September: 159mm
The wettest month (with the highest rainfall) is May (261mm).
The driest months (with the least rainfall) are January and February (11mm).
Average rainfall days in September
San Felipe, Guatemala
- Average rainfall days in September: 27.5 days
The month with the highest number of rainy days is September (27.5 days).
The month with the least rainy days is February (5.3 days).
Average daylight in September /
Average sunshine in September
San Felipe, Guatemala
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 18min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is November (Average sunshine: 7h and 30min).
Average sunshine days in September
San Felipe, Guatemala
- Average sunshine days in September: 1.4 days
The month with the most sunshine days is January (21.5 days).
The month with the least sunshine days is September (1.4 days).
Average UV index in September
San Felipe, Guatemala
- Average UV index in September: 6
The months with the highest UV index are February, March, April and July (UV index 7).
The months with the lowest UV index are January, May, June, August, September, October, November and December (UV index 6).
Average cloud cover in September
San Felipe, Guatemala
- Average cloud cover in September: 33
The month with the most cloud cover is June (Cloud cover 34).
The month with the least cloud cover is January (Cloud cover 11).
Average visibility in September
San Felipe, Guatemala
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are May, June, July, August, September and October (9km).
