May weather forecast
San Luis, AZ

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Weather in May

With a dramatic increase in temperatures peaking at 92.8°F (33.8°C), May in San Luis, Arizona manifests the onset of summer. As the month progresses, daylight hours extend, allowing more time for outdoor activities despite the climbing heat. Visibility remains excellent throughout this time, indicating minimal precipitation and fog. Increased wind speeds can provide some respite, albeit temporary, from the escalating heat. In essence, May marks the city's transition into the peak of its summer season.

Temperature

A soft shift in the average high-temperature is noticeable in May, transitioning from 86.5°F (30.3°C) in April to a still tropical 92.8°F (33.8°C). San Luis, after hot May days, encounters a marked drop to an average nighttime temperature of 68.7°F (20.4°C).

Humidity

In May, the average relative humidity in San Luis is 24%.

Rainfall

May is the only month when rain does not fall in San Luis.

Daylight

In May, the average length of the day is 13h and 50min.
On the first day of the month, sunrise is at 5:51 am and sunset at 7:20 pm. On the last day of May, in San Luis, sunrise is at 5:32 am and sunset at 7:41 pm MST.

Sunshine

In May, the average sunshine in San Luis is 12h.

UV index

In May, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 7 in May leads to these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

How hot is it in San Luis in May?

In May, the average high-temperature and low-temperature in San Luis are 92.8°F (33.8°C) and 68.7°F (20.4°C) respectively.

What is the average humidity in May in San Luis?

The average relative humidity in May in San Luis, Arizona, is 24%.

What is the driest month in San Luis?

The only month without rainfall in San Luis is May.

Does it rain in San Luis in May?

In May, in San Luis, Arizona, it doesn't rain. April is the latest month when it rains.

What is the average length of the day in May in San Luis?

The average day length in May in San Luis is 13h and 50min.

What time are sunrise and sunset in May in San Luis?

On the first day of May, sunrise is at 5:51 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 7:41 pm MST.

How long on average sun shines in May in San Luis?

In May, the average sunshine duration is 12h.

How high is the UV index in May in San Luis?

In May, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
San Luis, AZ

Average temperature in May - San Luis, AZ
  • Average high temperature in May: 92.8°F

The warmest month (with the highest average high temperature) is July (106.2°F).
The month with the lowest average high temperature is December (67.1°F).

  • Average low temperature in May: 68.7°F

The month with the highest average low temperature is August (86.2°F).
The coldest month (with the lowest average low temperature) is December (50.5°F).

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Average pressure in May
San Luis, AZ

Average pressure in May - San Luis, AZ
  • Average pressure in May: 29.81"Hg

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.75"Hg).

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Average wind speed in May
San Luis, AZ

Average wind speed in May - San Luis, AZ
  • Average wind speed in May: 8mph

The windiest month (with the highest average wind speed) is July (8.5mph).
The calmest month (with the lowest average wind speed) is November (6.7mph).

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Average humidity in May
San Luis, AZ

Average humidity in May - San Luis, AZ
  • Average humidity in May: 24%

The month with the highest relative humidity is December (38%).
The month with the lowest relative humidity is June (23%).

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Average rainfall in May
San Luis, AZ

Average rainfall in May - San Luis, AZ
  • Average rainfall in May: 0"

The wettest month (with the highest rainfall) is July (0.39").
The driest month (with the least rainfall) is May (0").

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Average rainfall days in May
San Luis, AZ

Average rainfall days in May - San Luis, AZ
  • Average rainfall days in May: 0.3 days

The month with the highest number of rainy days is July (5.1 days).
The month with the least rainy days is May (0.3 days).

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Average daylight in May /
Average sunshine in May
San Luis, AZ

Average daylight in May / Average sunshine in May - San Luis, AZ
  • Average daylight in May: 13h and 5min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in May: 12h and 0min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).

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Average sunshine days in May
San Luis, AZ

Average sunshine days in May - San Luis, AZ
  • Average sunshine days in May: 30.4 days

The month with the most sunshine days is May (30.4 days).
The month with the least sunshine days is July (24.3 days).

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Average UV index in May
San Luis, AZ

Average UV index in May - San Luis, AZ
  • Average UV index in May: 7

The months with the highest UV index are June, July, August and September (UV index 8).
The month with the lowest UV index is December (UV index 4).

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Average cloud cover in May
San Luis, AZ

Average cloud cover in May - San Luis, AZ
  • Average cloud cover in May: 6

The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 5).

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Average visibility in May
San Luis, AZ

Average visibility in May - San Luis, AZ
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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San Luis, Arizona, USA

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