September weather forecastSan Mateo, Guatemala
September
Weather in September
September, the first month of the autumn in San Mateo, is also an agreeable month, with an average temperature ranging between min 13.6°C (56.5°F) and max 21°C (69.8°F).Temperature
September denotes a minimal variation in the average high-temperature to a still pleasant 21°C (69.8°F) from August's 21.9°C (71.4°F). September nights in San Mateo cool down to an average low-temperature of 13.6°C (56.5°F).Humidity
With an average relative humidity of 87%, September is the most humid month in San Mateo, Guatemala.Rainfall
In September, in San Mateo, the rain falls for 28.8 days. Throughout September, 283mm (11.14") of precipitation is accumulated. In San Mateo, during the entire year, the rain falls for 263.6 days and collects up to 2061mm (81.14") of precipitation.Daylight
The average length of the day in September is 12h and 13min.On the first day of September in San Mateo, sunrise is at 05:54 and sunset at 18:18. On the last day of the month, sunrise is at 05:55 and sunset at 17:56 CST.
Sunshine
In San Mateo, the average sunshine in September is 8.7h.UV index
The months with the highest UV index are January through October and December, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
San Mateo, Guatemala
- Average high temperature in September: 21°C
The warmest month (with the highest average high temperature) is April (23.8°C).
The month with the lowest average high temperature is October (20.7°C).
- Average low temperature in September: 13.6°C
The month with the highest average low temperature is May (14.3°C).
The coldest month (with the lowest average low temperature) is January (10.2°C).
Average pressure in September
San Mateo, Guatemala
- Average pressure in September: 1012.7mbar
The month with the highest atmospheric pressure is January (1015.3mbar).
The month with the lowest atmospheric pressure is May (1012.6mbar).
Average wind speed in September
San Mateo, Guatemala
- Average wind speed in September: 4.4km/h
The windiest month (with the highest average wind speed) is January (6.1km/h).
The calmest month (with the lowest average wind speed) is May (4.1km/h).
Average humidity in September
San Mateo, Guatemala
- Average humidity in September: 87%
The month with the highest relative humidity is September (87%).
The month with the lowest relative humidity is March (69%).
Average rainfall in September
San Mateo, Guatemala
- Average rainfall in September: 283mm
The wettest month (with the highest rainfall) is May (372mm).
The driest month (with the least rainfall) is January (14mm).
Average rainfall days in September
San Mateo, Guatemala
- Average rainfall days in September: 28.8 days
The months with the highest number of rainy days are June and October (29.2 days).
The month with the least rainy days is February (10.8 days).
Average daylight in September /
Average sunshine in September
San Mateo, Guatemala
- Average daylight in September: 12h and 12min
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: 8h and 42min
The month with the most sunshine is April (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 7h and 12min).
Average sunshine days in September
San Mateo, Guatemala
- Average sunshine days in September: 0.6 days
The month with the most sunshine days is December (13.5 days).
The month with the least sunshine days is October (0.5 days).
Average UV index in September
San Mateo, Guatemala
- Average UV index in September: 5
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October and December (UV index 5).
The month with the lowest UV index is November (UV index 4).
Average cloud cover in September
San Mateo, Guatemala
- Average cloud cover in September: 50
The month with the most cloud cover is June (Cloud cover 51).
The months with the least cloud cover are January and February (Cloud cover 19).
Average visibility in September
San Mateo, Guatemala
- Average visibility in September: 8km
The months with the highest visibility are January, February and March (10km).
The months with the lowest visibility are May, June, August, September and October (8km).
