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 coldest month is September, with an average high-temperature of 28.5°C (83.3°F) and an average low-temperature of 19.4°C (66.9°F).Heat index
The heat index value for September is appraised at a tropical 33°C (91.4°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.Given the heat index, its values are aligned with shaded sites and gentle winds. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Humidity
September and October, with an average relative humidity of 79%, are the most humid months in Santo Tomás La Unión.Rainfall
In September, the rain falls for 27.5 days. Throughout September, 209mm (8.23") of precipitation is accumulated. Throughout the year, there are 222.8 rainfall days, and 1491mm (58.7") of precipitation is accumulated.Daylight
In Santo Tomás La Unión, the average length of the day in September is 12h and 13min.On the first day of the month, sunrise is at 05:53 and sunset at 18:17. On the last day of September, in Santo Tomás La Unión, sunrise is at 05:55 and sunset at 17:55 CST.
Sunshine
In Santo Tomás La Unión, Guatemala, the average sunshine in September is 10.4h.UV index
The months with the highest UV index are January through December, with an average maximum UV index of 6. The months with the lowest UV index are January through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: In September, a regular UV index of 6 translates into these guidelines:
Guard against overexposure. Protection from sun-induced harm is essential. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Santo Tomás La Unión?
Is it hot in Santo Tomás La Unión during September?
What is the most humid month in Santo Tomás La Unión?
What is the average humidity in September in Santo Tomás La Unión?
How much does it rain in Santo Tomás La Unión in September?
What is the average length of the day in September in Santo Tomás La Unión?
What time are sunrise and sunset in September in Santo Tomás La Unión?
How many hours of sunshine does Santo Tomás La Unión have in September?
What is the month with the highest UV index in Santo Tomás La Unión?
What are the months with the lowest UV index in Santo Tomás La Unión?
What is the UV index reading in September in Santo Tomás La Unión?
Average temperature in September
Santo Tomás La Unión, Guatemala
- Average high temperature in September: 28.5°C
The warmest month (with the highest average high temperature) is March (31.5°C).
The month with the lowest average high temperature is September (28.5°C).
- Average low temperature in September: 19.4°C
The month with the highest average low temperature is May (20.5°C).
The coldest month (with the lowest average low temperature) is December (17.6°C).
Average pressure in September
Santo Tomás La Unión, Guatemala
- Average pressure in September: 1012.4mbar
The month with the highest atmospheric pressure is January (1014.5mbar).
The month with the lowest atmospheric pressure is October (1012.2mbar).
Average wind speed in September
Santo Tomás La Unión, Guatemala
- Average wind speed in September: 5.2km/h
The windiest month (with the highest average wind speed) is March (6.6km/h).
The calmest month (with the lowest average wind speed) is May (5.1km/h).
Average humidity in September
Santo Tomás La Unión, Guatemala
- Average humidity in September: 79%
The months with the highest relative humidity are September and October (79%).
The months with the lowest relative humidity are January, February and March (59%).
Average rainfall in September
Santo Tomás La Unión, Guatemala
- Average rainfall in September: 209mm
The wettest month (with the highest rainfall) is May (274mm).
The driest months (with the least rainfall) are January and February (7mm).
Average rainfall days in September
Santo Tomás La Unión, 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 January (4.8 days).
Average daylight in September /
Average sunshine in September
Santo Tomás La Unión, 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 2min
The months with the most sunshine are April and July (Average sunshine: 11h and 12min).
The month with the least sunshine is November (Average sunshine: 7h and 24min).
Average sunshine days in September
Santo Tomás La Unión, Guatemala
- Average sunshine days in September: 1.5 days
The month with the most sunshine days is January (24.4 days).
The month with the least sunshine days is September (1.5 days).
Average UV index in September
Santo Tomás La Unión, Guatemala
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover in September
Santo Tomás La Unión, Guatemala
- Average cloud cover in September: 36
The month with the most cloud cover is June (Cloud cover 38).
The month with the least cloud cover is January (Cloud cover 12).
Average visibility in September
Santo Tomás La Unión, Guatemala
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).
