Contents
September
Weather in September
Temperature
September's onset brings an average high-temperature of a still moderately hot 24.3°C (75.7°F), showing a minute difference from August's 25.1°C (77.2°F). In Santa Maria Island, September nights witness a steady temperature drop to a refreshing 18.6°C (65.5°F).Humidity
In September, the average relative humidity is 76%.Rainfall
In Santa Maria Island, during September, the rain falls for 8 days and regularly aggregates up to 57mm (2.24") of precipitation. In Santa Maria Island, during the entire year, the rain falls for 100 days and collects up to 775mm (30.51") of precipitation.Sea temperature
In Santa Maria Island, in September, the average water temperature is 23°C (73.4°F).Note: Individual preferences to cold, influenced by conditions such as sunshine, wind, and surrounding temperature, play a part in the comfort of swimming in 23°C (73.4°F) waters. (As an aside, Olympic swimming standards dictate water temperatures from 25°C (77°F) to 28°C (82.4°F).)
Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 07:11 and sunset at 20:08. On the last day of the month, sunrise is at 07:35 and sunset at 19:25 +00.
Sunshine
In Santa Maria Island, the average sunshine in September is 6.2h.UV index
In Santa Maria Island, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 7 during September translates into the following directions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Alert! The Sun's UV rays are heightened by the reflection of sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
What is the sea temperature in September?
How many hours of daylight does Santa Maria Island have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Santa Maria Island, Portugal
- Average high temperature in September: 24.3°C
The warmest month (with the highest average high temperature) is August (25.1°C).
The month with the lowest average high temperature is February (16.5°C).
- Average low temperature in September: 18.6°C
The month with the highest average low temperature is August (19.2°C).
The coldest month (with the lowest average low temperature) is February (11.5°C).
Average humidity in September
Santa Maria Island, Portugal
- Average humidity in September: 76%
The months with the highest relative humidity are January and December (79%).
The months with the lowest relative humidity are April, May, July and August (75%).
Average rainfall in September
Santa Maria Island, Portugal
- Average rainfall in September: 57mm
The wettest month (with the highest rainfall) is November (102mm).
The driest month (with the least rainfall) is June (22mm).
Average rainfall days in September
Santa Maria Island, Portugal
- Average rainfall days in September: 8 days
The months with the highest number of rainy days are January and December (12 days).
The months with the least rainy days are June and July (4 days).
Average sea temperature in September
Santa Maria Island, Portugal
- Average sea temperature in September: 23°C
The best month for swimming (with the highest average sea temperature) is August (24°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (17°C).
Average daylight in September /
Average sunshine in September
Santa Maria Island, Portugal
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 6h and 1min
The month with the most sunshine is July (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average UV index in September
Santa Maria Island, Portugal
- Average UV index in September: 7
The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).
