September weather forecastConstitución, Chile
September
Weather in September
September in Constitución signals the onset of spring and the welcome departure of the winter chill. The moderately cool weather observed in August gives way to a slight temperature increase. The precipitation drops noticeably, recording only 28mm (1.1"), showcasing a significant reduction in rainfall. The improving weather conditions also result in longer daylight hours and an increase in sea temperature. Residents and tourists can look forward to rejuvenating sunshine, as the UV index begins to rise.Temperature
The arrival of September marks a slight shift to an average high-temperature of a still moderate 15°C (59°F) from August's 13.8°C (56.8°F). An average low-temperature of 8.8°C (47.8°F) is observed during September nights.Humidity
The average relative humidity in September is 76%.Rainfall
In Constitución, in September, during 6.7 rainfall days, 28mm (1.1") of precipitation is typically accumulated. Throughout the year, in Constitución, there are 65.1 rainfall days, and 356mm (14.02") of precipitation is accumulated.Sea temperature
August and September, with an average sea temperature of 12.8°C (55°F), are months with the coldest seawater.Note: Swimming in 12.8°C (55°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
Daylight
In Constitución, the average length of the day in September is 11h and 53min.On the first day of the month, sunrise is at 07:07 and sunset at 18:31 -04. On the last day of September, in Constitución, sunrise is at 07:26 and sunset at 19:52 -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 Constitución, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Constitución, Chile
- Average high temperature in September: 15°C
The warmest months (with the highest average high temperature) are January and February (21.8°C).
The month with the lowest average high temperature is July (12.8°C).
- Average low temperature in September: 8.8°C
The month with the highest average low temperature is January (14.5°C).
The coldest month (with the lowest average low temperature) is July (8.2°C).
Average pressure in September
Constitución, Chile
- Average pressure in September: 1019.6mbar
The month with the highest atmospheric pressure is July (1020mbar).
The month with the lowest atmospheric pressure is February (1013.9mbar).
Average wind speed in September
Constitución, Chile
- Average wind speed in September: 14.8km/h
The windiest month (with the highest average wind speed) is November (17.6km/h).
The calmest month (with the lowest average wind speed) is May (13km/h).
Average humidity in September
Constitución, Chile
- Average humidity in September: 76%
The months with the highest relative humidity are June, July and August (78%).
The months with the lowest relative humidity are January and March (70%).
Average rainfall in September
Constitución, Chile
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is June (106mm).
The driest months (with the least rainfall) are January and February (1mm).
Average rainfall days in September
Constitución, Chile
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is June (11.3 days).
The month with the least rainy days is February (0.9 days).
Average sea temperature in September
Constitución, Chile
- Average sea temperature in September: 12.8°C
The best month for swimming (with the highest average sea temperature) is March (16.4°C).
The coldest months (with the lowest average sea temperature) are August and September (12.8°C).
Average daylight in September /
Average sunshine in September
Constitución, Chile
- Average daylight in September: 11h and 54min
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 18min
The month with the most sunshine is January (Average sunshine: 11h and 42min).
The month with the least sunshine is June (Average sunshine: 7h and 30min).
Average sunshine days in September
Constitución, Chile
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is March (29.5 days).
The month with the least sunshine days is June (18 days).
Average UV index in September
Constitución, Chile
- Average UV index in September: 4
The months with the highest UV index are January, February, March, April, November and December (UV index 5).
The months with the lowest UV index are June and July (UV index 3).
Average cloud cover in September
Constitución, Chile
- Average cloud cover in September: 29
The month with the most cloud cover is June (Cloud cover 36).
The month with the least cloud cover is February (Cloud cover 8).
Average visibility in September
Constitución, Chile
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is May (9km).
