September weather forecastAnnaba, Algeria
September
Weather in September
September arouses a gentle adieu to the scorching summer with a slight drop in temperatures compared to August's high. The sea temperature starts a gradual descent, measuring a slight reduction to 25°C (77°F). September carries the remnants of the summer warmth, dressed in the beginnings of an autumn chill. The arrival of autumn adorns the scenic beauty of Annaba with a russet tinge. Gently ushering the city from the luxuriant warmth, September narrates a subtle tale of changing seasons.Temperature
The transition into September in Annaba is accompanied by a slight temperature decrease, with the average high-temperature shifting from a tropical 30.3°C (86.5°F) in August to a warm 27.1°C (80.8°F). The average nighttime temperature lowers to an agreeable 21°C (69.8°F) throughout September.Heat index
Throughout September, the heat index is computed to be 29°C (84.2°F). Constant activity during exposure could result in a state of weariness and possibly heat cramps.It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Humidity
In September, the average relative humidity in Annaba is 68%.Rainfall
In September, the rain falls for 9 days. Throughout September, 21mm (0.83") of precipitation is accumulated. Throughout the year, in Annaba, there are 135.7 rainfall days, and 464mm (18.27") of precipitation is accumulated.Sea temperature
In Annaba, in September, the average water temperature is 25°C (77°F).Note: Water surface temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.
Daylight
In Annaba, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 06:00 and sunset at 18:57. On the last day of the month, sunrise is at 06:23 and sunset at 18:13 CET.
Sunshine
The average sunshine in September is 9.5h.UV index
In Annaba, Algeria, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Stay aware! UV radiation is magnified when reflecting off sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Annaba, Algeria
- Average high temperature in September: 27.1°C
The warmest month (with the highest average high temperature) is August (30.3°C).
The months with the lowest average high temperature are January and February (14.3°C).
- Average low temperature in September: 21°C
The month with the highest average low temperature is August (23°C).
The coldest month (with the lowest average low temperature) is February (8.7°C).
Average pressure in September
Annaba, Algeria
- Average pressure in September: 1016.7mbar
The month with the highest atmospheric pressure is December (1021.2mbar).
The month with the lowest atmospheric pressure is April (1014.8mbar).
Average wind speed in September
Annaba, Algeria
- Average wind speed in September: 10km/h
The windiest month (with the highest average wind speed) is February (16.4km/h).
The calmest month (with the lowest average wind speed) is August (9.3km/h).
Average humidity in September
Annaba, Algeria
- Average humidity in September: 68%
The month with the highest relative humidity is April (77%).
The month with the lowest relative humidity is July (62%).
Average rainfall in September
Annaba, Algeria
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is January (71mm).
The driest month (with the least rainfall) is July (3mm).
Average rainfall days in September
Annaba, Algeria
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is January (17.9 days).
The month with the least rainy days is July (2.8 days).
Average sea temperature in September
Annaba, Algeria
- Average sea temperature in September: 25°C
The best month for swimming (with the highest average sea temperature) is August (25.8°C).
The coldest month (with the lowest average sea temperature) is February (14.7°C).
Average daylight in September /
Average sunshine in September
Annaba, Algeria
- Average daylight in September: 12h and 24min
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: 9h and 30min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Annaba, Algeria
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is February (10.5 days).
Average UV index in September
Annaba, Algeria
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Annaba, Algeria
- Average cloud cover in September: 20
The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Annaba, Algeria
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
