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September Weather in Alamo, United States

Last updated: June 24, 2025

In September, the average temperature in Alamo, United States is a pleasant 24°C (75°F). However, temperatures can range from a cool 9°C (49°F) to a scorching 36°C (97°F). During this month, expect approximately 112 mm (4.4 in) of precipitation over about 7 days. With an average humidity of 70%, be prepared for some stickiness in the air!

September Temperature in Alamo

In September in Alamo, the average temperature is 24°C (75°F). Maximums can reach 36°C (97°F), and minimums can be as low as 9°C (49°F). This makes Alamo an ideal destination for travelers seeking pleasant weather with a range of temperatures suitable for various activities.

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 24°C (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec414554607178817975644946
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 112 mm (4.4 in) over a period of 7 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 112 mm (4.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec10017317214910110612210311211688142
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 70%. With an average temperature of 24°C (75°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit sluggish and sticky, ideal for leisurely strolls but requiring plenty of hydration.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710101111109753
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 Weather5°C (41°F)100 mm (3.9 inches)86%moderate
February Weather7°C (45°F)173 mm (6.8 inches)85%high
March Weather12°C (54°F)172 mm (6.8 inches)84%high
April Weather16°C (60°F)149 mm (5.9 inches)81%very high
May Weather22°C (71°F)101 mm (4.0 inches)83%very high
June Weather26°C (78°F)105 mm (4.2 inches)83%extreme
July Weather27°C (81°F)122 mm (4.8 inches)80%extreme
August Weather26°C (79°F)103 mm (4.1 inches)73%very high
September Weather24°C (75°F)112 mm (4.4 inches)70%very high
October Weather18°C (64°F)116 mm (4.6 inches)73%high
November Weather10°C (50°F)88 mm (3.5 inches)85%moderate
December Weather8°C (46°F)142 mm (5.6 inches)88%moderate

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