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September Weather in Alger, United States

Last updated: June 24, 2025

In Alger, United States, the average temperature in September is a comfortable 20°C (68°F). However, temperatures can range from a cool 4°C (40°F) to a warm 33°C (92°F). Expect 73 mm (2.9 in) of precipitation spread over about 8 days, contributing to an average humidity of 78%. Perfect for exploring the local sights, just be sure to pack accordingly!

September Temperature in Alger

In September, in Alger, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F), and minimums can be as low as 4°C (40°F). It's advisable to pack layers to accommodate both warm days and cooler nights while enjoying your travels.

September Weather in Alger: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Alger, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alger, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241506372757368574135
Data source: Temperature data for Alger generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Alger

In Alger in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Alger

The chart displays monthly precipitation patterns in Alger, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Alger, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7292981061301271088873948670
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alger

In Alger in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Alger

This chart illustrates the average monthly humidity levels in Alger, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Alger is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alger

In Alger in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Alger.

Maximum UV Index Levels in Alger for September

The chart shows the monthly maximum UV Index (UVI) for Alger in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Alger typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Alger September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Alger Compares to Other Months

Weather in Alger varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Alger, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Alger, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)72 mm (2.8 inches)88%moderate
February Weather0°C (32°F)92 mm (3.6 inches)87%moderate
March Weather5°C (41°F)98 mm (3.9 inches)87%high
April Weather10°C (51°F)106 mm (4.2 inches)87%very high
May Weather17°C (63°F)130 mm (5.1 inches)81%very high
June Weather22°C (72°F)127 mm (5.0 inches)82%very high
July Weather24°C (76°F)108 mm (4.3 inches)81%very high
August Weather23°C (73°F)88 mm (3.5 inches)78%very high
September Weather20°C (68°F)73 mm (2.9 inches)78%very high
October Weather14°C (57°F)94 mm (3.7 inches)82%high
November Weather5°C (42°F)86 mm (3.4 inches)89%moderate
December Weather2°C (35°F)70 mm (2.7 inches)86%low

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