September Weather in Alamo, United States

Last updated: June 24, 2025

In Alamo, United States, the average temperature in September is a comfortable 20°C (68°F). Expect minimums as low as 3°C (37°F) and maximums reaching up to 33°C (92°F). With an average precipitation of 32 mm (1.3 in) spread across 4 days, and an average humidity of 62%, the weather is pleasantly mild, perfect for outdoor activities!

September Temperature in Alamo

In September in Alamo, the average temperature is 20°C (68°F). Maximums can reach 33°C (92°F), and minimums can be as low as 3°C (37°F). This pleasant climate makes Alamo an ideal destination for travelers looking to enjoy a variety of outdoor 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 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for Alamo generated using information from the Copernicus Climate Change Service.

September Precipitation in Alamo

In Alamo in September, the total precipitation amount is 32 mm (1.3 in), accumulated over a period of 4 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 32 mm (1.3 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Alamo

In Alamo in September, humidity is 62%. With an average temperature of 20°C (68°F), this humidity feels like a warm, balmy embrace that can make outdoor activities enjoyable in the early morning and late afternoon, but can become quite stifling during the midday heat, making it advisable to stay hydrated and take breaks in shaded areas while 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 62%, offering insight into how humid the weather typically is during this month.

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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (35°F)	18 mm (0.7 inches)	81%	moderate
February Weather	4°C (39°F)	16 mm (0.6 inches)	83%	high
March Weather	8°C (47°F)	19 mm (0.8 inches)	71%	very high
April Weather	13°C (56°F)	12 mm (0.5 inches)	61%	extreme
May Weather	18°C (64°F)	11 mm (0.4 inches)	48%	extreme
June Weather	23°C (74°F)	19 mm (0.7 inches)	36%	extreme
July Weather	24°C (75°F)	47 mm (1.8 inches)	37%	extreme
August Weather	23°C (74°F)	33 mm (1.3 inches)	46%	extreme
September Weather	20°C (68°F)	32 mm (1.3 inches)	62%	extreme
October Weather	13°C (56°F)	19 mm (0.8 inches)	74%	very high
November Weather	8°C (46°F)	12 mm (0.5 inches)	82%	high
December Weather	2°C (36°F)	12 mm (0.5 inches)	82%	moderate