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May Weather in Altoona, United States

Last updated: June 24, 2025

In May, the average temperature in Altoona, United States is a pleasant 22°C (72°F). Be prepared for a temperature range that swings from a cool 6°C (43°F) to a warm 34°C (94°F). With 105 mm (4.1 in) of precipitation spread over 11 days, you might want to pack an umbrella. The average humidity sits at a notably high 81%, ensuring that the air feels quite moist throughout the month.

May Temperature in Altoona

In May in Altoona, the average temperature is 22°C (72°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 6°C (43°F). This variety in temperature makes Altoona an ideal destination for travelers seeking both warmth and cooler experiences.

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

The chart illustrates May temperature patterns in Altoona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altoona, May typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627177807975665248
Data source: Temperature data for Altoona 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 Altoona

In Altoona in May, the precipitation amount is 105 mm (4.1 in) over the course of 11 days.

May Precipitation Trends in Altoona

The chart displays monthly precipitation patterns in Altoona, 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 Altoona, May typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec12218416515710513411412010112880150
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Altoona

In Altoona in May, humidity is 81%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket, making traveling feel both lush and a bit stifling, as the air clings to your skin and every step is accompanied by a gentle sheen of moisture.

May Average Humidity in Altoona

This chart illustrates the average monthly humidity levels in Altoona, 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 Altoona is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Altoona

In Altoona in May, 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 Altoona.

Maximum UV Index Levels in Altoona for May

The chart shows the monthly maximum UV Index (UVI) for Altoona 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 Altoona typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119764
Data source: Altoona 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 Altoona Compares to Other Months

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

This table compares monthly weather conditions in Altoona, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)122 mm (4.8 inches)85%moderate
February Weather10°C (51°F)184 mm (7.2 inches)84%high
March Weather14°C (57°F)165 mm (6.5 inches)82%very high
April Weather17°C (62°F)157 mm (6.2 inches)82%very high
May Weather22°C (72°F)105 mm (4.1 inches)81%extreme
June Weather25°C (77°F)134 mm (5.3 inches)77%extreme
July Weather27°C (80°F)114 mm (4.5 inches)77%extreme
August Weather26°C (79°F)120 mm (4.7 inches)72%extreme
September Weather24°C (76°F)101 mm (4.0 inches)73%very high
October Weather19°C (66°F)128 mm (5.0 inches)73%high
November Weather11°C (52°F)80 mm (3.1 inches)85%high
December Weather9°C (48°F)150 mm (5.9 inches)88%moderate

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