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May Weather in Portales, United States

Last updated: June 24, 2025

The average temperature in Portales, United States during May is a pleasant 21°C (70°F). Daily highs can soar to 37°C (100°F), while cool nights may dip to a low of 1°C (34°F). Expect precipitation of about 33 mm (1.3 in) spread over 7 days, paired with an average humidity of 69%. Enjoy the diverse climate while planning your activities!

May Temperature in Portales

In May in Portales, the average temperature is 21°C (70°F). The maximum can reach 37°C (100°F), while the minimum can be as low as 1°C (34°F). Be sure to pack for both warm days and cool nights when traveling during this time!

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

The chart illustrates May 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, May typically has an average temperature of 21°C (70°F), with highs reaching up to 37°C (100°F) and lows dropping to around 1°C (34°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.

May Precipitation in Portales

In Portales in May, the precipitation amount is 33 mm (1.3 in) over a period of 7 days.

May Precipitation Trends in Portales

The chart displays monthly precipitation patterns in Portales, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Portales, May typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec19122819334528473654117
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Portales

In Portales in May humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

May Average Humidity in Portales

This chart illustrates the average monthly humidity levels in Portales, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Portales is approximately 69%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Portales

In Portales in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Portales.

Maximum UV Index Levels in Portales for May

The chart shows the monthly maximum UV Index (UVI) for Portales in May, 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 May, the maximum UV index in Portales typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121210864
Data source: Portales May 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 May 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 May’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 May’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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