September weather forecast
Guatemala City, Guatemala

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The iconic buildings of the cathedral in Guatemala City, Guatemala
The iconic buildings of the cathedral in Guatemala City, Guatemala

Weather in September

Guatemala City's weather in September witnesses a second peak in the rainfall volume with a significant increase compared to August. The meteorological conditions showcase a pattern similar to that seen in the onset of the wet season. While this month experiences the highest relative humidity, no significant transition in temperature is evident from August. September is characterized by highest humidity and second-highest rainfall, making it a typical month during Guatemala's wet season.

Temperature

The commencement of September records an average high-temperature of a still warm 25.1°C (77.2°F), barely varying from August's 25.5°C (77.9°F). During September, Guatemala City witnesses a consistent average low-temperature of 16.4°C (61.5°F).

Humidity

The most humid month is September, with an average relative humidity of 84.5%.

Rainfall

In Guatemala City, Guatemala, in September, during 20.8 rainfall days, 237mm (9.33") of precipitation is typically accumulated. Throughout the year, in Guatemala City, there are 125.2 rainfall days, and 1275mm (50.2") of precipitation is accumulated.

Daylight

In Guatemala City, the average length of the day in September is 12h and 13min.
On the first day of September in Guatemala City, sunrise is at 05:49 and sunset at 18:13. On the last day of the month, sunrise is at 05:51 and sunset at 17:51 CST.

Sunshine

The average sunshine in September is 5.3h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an excessive health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, a regular UV index of 12 translates into these guidelines:
Put into effect every essential safeguard, as unprotected skin and eyes might burn instantly. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the usual temperature for Guatemala City in September?

In Guatemala City, in September, the average high-temperature is 25.1°C (77.2°F), and the average low-temperature is 16.4°C (61.5°F). In May, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, is evaluated at 30°C (86°F).

What is the most humid month?

With an average relative humidity of 84.5%, September is the most humid month.

What is the average humidity in September?

In Guatemala City, the average relative humidity in September is 84.5%.

How much does it rain in Guatemala City in September?

In Guatemala City, in September, during 20.8 rainfall days, 237mm (9.33") of precipitation is typically accumulated.

How many hours of daylight does Guatemala City have in September?

The average day length in September is 12h and 13min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 05:49 and sunset at 18:13. On the last day of the month, sunrise is at 05:51 and sunset at 17:51 CST.

How long on average sun shines in September in Guatemala City?

In Guatemala City, the average sunshine duration in September is 5.3h.

What are the months with the highest UV index?

February through October, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Guatemala City, Guatemala

Average temperature in September - Guatemala City, Guatemala
  • Average high temperature in September: 25.1°C

The warmest month (with the highest average high temperature) is April (27.8°C).
The month with the lowest average high temperature is December (23.9°C).

  • Average low temperature in September: 16.4°C

The months with the highest average low temperature are May and June (16.8°C).
The coldest month (with the lowest average low temperature) is January (13.2°C).

Average humidity in September
Guatemala City, Guatemala

Average humidity in September - Guatemala City, Guatemala
  • Average humidity in September: 84.5%

The month with the highest relative humidity is September (84.5%).
The month with the lowest relative humidity is March (73.2%).

Average rainfall in September
Guatemala City, Guatemala

Average rainfall in September - Guatemala City, Guatemala
  • Average rainfall in September: 236.6mm

The wettest month (with the highest rainfall) is June (271.8mm).
The driest month (with the least rainfall) is January (2.8mm).

Average rainfall days in September
Guatemala City, Guatemala

Average rainfall days in September - Guatemala City, Guatemala
  • Average rainfall days in September: 20.8 days

The month with the highest number of rainy days is June (21.1 days).
The month with the least rainy days is February (1.5 days).

Average daylight in September /
Average sunshine in September
Guatemala City, Guatemala

Average daylight in September / Average sunshine in September - Guatemala City, 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: 5h and 2min

The month with the most sunshine is February (Average sunshine: 8h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 12min).

Average UV index in September
Guatemala City, Guatemala

Average UV index in September - Guatemala City, Guatemala
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 9).

Guatemala City, Guatemala

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