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September Weather in Portales, United States

Last updated: June 24, 2025

In Portales, United States, the average temperature in September hovers around 22°C (72°F), offering a pleasant climate. However, be prepared for a range, as temperatures can dip to a cool 2°C (37°F) or soar up to a sweltering 37°C (99°F). Expect 36 mm (1.4 in) of precipitation over 6 days, accompanied by an average humidity of 76%, creating a lush and vibrant atmosphere.

September Temperature in Portales

In September in Portales, the average temperature is 22°C (72°F). Maximum temperatures can reach up to 37°C (99°F), while minimums can drop as low as 2°C (37°F). It's advisable to pack layers and prepare for both warm days and cool nights while traveling.

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

The chart illustrates September temperature patterns in Portales, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portales, September typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (99°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec404353596978807872594942
Data source: Temperature data for Portales 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 Portales

In Portales in September, the total precipitation amount is 36 mm (1.4 in), which falls over the course of 6 days.

September Precipitation Trends in Portales

The chart displays monthly precipitation patterns in Portales, 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 Portales, September typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec19122819334528473654117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portales

In Portales in September humidity is 76%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as you navigate through the thick, saturated air.

September Average Humidity in Portales

This chart illustrates the average monthly humidity levels in Portales, 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 Portales is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%75%61%62%69%74%75%78%76%76%80%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portales

In Portales 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 Portales.

Maximum UV Index Levels in Portales for September

The chart shows the monthly maximum UV Index (UVI) for Portales 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 Portales typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121210864
Data source: Portales 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 Portales Compares to Other Months

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

This table compares monthly weather conditions in Portales, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)19 mm (0.7 inches)74%moderate
February Weather6°C (43°F)12 mm (0.5 inches)75%high
March Weather11°C (53°F)28 mm (1.1 inches)61%very high
April Weather15°C (60°F)19 mm (0.7 inches)61%extreme
May Weather21°C (70°F)33 mm (1.3 inches)69%extreme
June Weather25°C (78°F)45 mm (1.8 inches)74%extreme
July Weather27°C (80°F)28 mm (1.1 inches)75%extreme
August Weather26°C (78°F)47 mm (1.9 inches)78%extreme
September Weather22°C (72°F)36 mm (1.4 inches)76%very high
October Weather15°C (59°F)54 mm (2.1 inches)76%very high
November Weather10°C (50°F)11 mm (0.4 inches)80%high
December Weather6°C (43°F)7 mm (0.3 inches)77%moderate

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