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September Weather in Alamo, United States

Last updated: June 24, 2025

In September, the average temperature in Alamo, United States hovers around 26°C (80°F). Expect a range between a cool 13°C (56°F) and a sweltering 38°C (101°F). Be prepared for 102 mm (4.0 in) of precipitation spread over about 10 days, accompanied by a high humidity level of 82%.

September Temperature in Alamo

In September in Alamo, the average temperature is 26°C (80°F). Maximums can reach 38°C (101°F), and minimums can be as low as 13°C (56°F). Visitors should be prepared for warm weather, with the possibility of cooler evenings, making it an ideal time for both outdoor adventures and leisurely explorations.

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

The chart illustrates September temperature patterns in Alamo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alamo, September typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec515761677580838279715853
Data source: Temperature data for Alamo 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 Alamo

In Alamo in September, the total precipitation amount is 102 mm (4.0 in) falling over the course of 10 days.

September Precipitation Trends in Alamo

The chart displays monthly precipitation patterns in Alamo, 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 Alamo, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec871077779811091201171028956126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alamo

In Alamo in September, humidity is 82%. With an average temperature of 26°C (80°F), this humidity feels like a heavy, warm blanket wrapping around you, making outdoor activities feel more exhausting and sweaty, which can be quite challenging for traveling.

September Average Humidity in Alamo

This chart illustrates the average monthly humidity levels in Alamo, 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 Alamo is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%81%81%81%83%81%82%78%86%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alamo

In Alamo in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Alamo.

Maximum UV Index Levels in Alamo for September

The chart shows the monthly maximum UV Index (UVI) for Alamo 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 Alamo typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
Data source: Alamo 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 Alamo Compares to Other Months

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

This table compares monthly weather conditions in Alamo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)87 mm (3.4 inches)86%moderate
February Weather14°C (57°F)107 mm (4.2 inches)84%high
March Weather16°C (61°F)77 mm (3.0 inches)83%very high
April Weather20°C (67°F)79 mm (3.1 inches)81%very high
May Weather24°C (76°F)81 mm (3.2 inches)81%extreme
June Weather27°C (80°F)109 mm (4.3 inches)81%extreme
July Weather28°C (83°F)120 mm (4.7 inches)83%extreme
August Weather28°C (83°F)117 mm (4.6 inches)81%extreme
September Weather26°C (80°F)102 mm (4.0 inches)82%very high
October Weather22°C (72°F)89 mm (3.5 inches)78%very high
November Weather14°C (58°F)56 mm (2.2 inches)86%high
December Weather12°C (53°F)126 mm (4.9 inches)89%moderate

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