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 shift from August to September sees a slight increase in the average high-temperature, transitioning from a mild 14.9°C (58.8°F) to a comfortable 18.2°C (64.8°F). A striking difference from the daytime highs is registered during September nights in San Clemente, with an average temperature of 5.9°C (42.6°F).Humidity
In September, the average relative humidity is 71%.Rainfall
In September, the rain falls for 8.2 days. Throughout September, 48mm (1.89") of precipitation is accumulated. Throughout the year, there are 67.7 rainfall days, and 508mm (20") of precipitation is accumulated.Daylight
The average length of the day in September in San Clemente is 11h and 53min.On the first day of the month, sunrise is at 07:04 and sunset at 18:27 -04. On the last day of September, sunrise is at 07:22 and sunset at 19:48 -03.
Note: On Sunday, 08. September 2024, at 00:00, Daylight Saving Time starts, and the time zone changes from -04 to -03. Daylight Saving Time lasts until Sunday, 06. April 2025, at 00:00; consequently, the time zone reverts from -03 to -04.
Sunshine
In September, the average sunshine is 8.1h.UV index
The months with the lowest UV index are May through July and September, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in San Clemente?
What is the average humidity in September in San Clemente?
How many days does it rain in September in San Clemente?
How many hours of daylight does San Clemente have in September?
What time are sunrise and sunset in September in San Clemente?
When does Daylight Saving Time (DST) start in September in San Clemente?
How long on average sun shines in September in San Clemente?
What is the month with the lowest UV index in San Clemente?
How high is the UV index in September in San Clemente?
Average temperature in September
San Clemente, Chile
- Average high temperature in September: 18.2°C
The warmest month (with the highest average high temperature) is January (32.4°C).
The month with the lowest average high temperature is July (13.3°C).
- Average low temperature in September: 5.9°C
The month with the highest average low temperature is January (13°C).
The coldest month (with the lowest average low temperature) is July (4.6°C).
Average pressure in September
San Clemente, Chile
- Average pressure in September: 1019.4mbar
The month with the highest atmospheric pressure is July (1020.1mbar).
The month with the lowest atmospheric pressure is February (1013.9mbar).
Average wind speed in September
San Clemente, Chile
- Average wind speed in September: 7.7km/h
The windiest months (with the highest average wind speed) are January and December (9.1km/h).
The calmest month (with the lowest average wind speed) is May (7.1km/h).
Average humidity in September
San Clemente, Chile
- Average humidity in September: 71%
The month with the highest relative humidity is August (77%).
The months with the lowest relative humidity are January and February (47%).
Average rainfall in September
San Clemente, Chile
- Average rainfall in September: 48mm
The wettest month (with the highest rainfall) is June (131mm).
The driest months (with the least rainfall) are January and February (2mm).
Average rainfall days in September
San Clemente, Chile
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is August (11.2 days).
The month with the least rainy days is February (0.8 days).
Average daylight in September /
Average sunshine in September
San Clemente, Chile
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 14h and 30min).
The month with the shortest days is June (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is January (Average sunshine: 11h and 30min).
The months with the least sunshine are June and July (Average sunshine: 7h and 24min).
Average sunshine days in September
San Clemente, Chile
- Average sunshine days in September: 20.7 days
The month with the most sunshine days is March (29.7 days).
The month with the least sunshine days is June (19 days).
Average UV index in September
San Clemente, Chile
- Average UV index in September: 3
The months with the highest UV index are January, February and December (UV index 6).
The months with the lowest UV index are May, June, July and September (UV index 3).
Average cloud cover in September
San Clemente, Chile
- Average cloud cover in September: 30
The months with the most cloud cover are June and August (Cloud cover 36).
The month with the least cloud cover is February (Cloud cover 6).
Average visibility in September
San Clemente, Chile
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, October, November and December (10km).
The months with the lowest visibility are July, August and September (9km).
