May weather forecastPortal, AZ
May
Weather in May
May is when summer truly begins in Portal, Arizona. Weather during this month is predominantly characterized by warmth and longer hours of daylight. Compared to the breezier conditions of April, the wind speeds start to decrease, rendering an overall calm ambiance. It's worth mentioning that May sees a significant jump in temperatures with the high temperatures peaking around 82.9°F (28.3°C). Despite the higher heat, cloud cover remains minimal, leading to bright, sunny days for most of the month.Temperature
With the onset of May, the average high-temperature subtly transitions from a warm 75.2°F (24°C) in April to a still moderately hot 82.9°F (28.3°C). Despite drastic daily temperature oscillations, Portal cools down to an average low-temperature of 57.7°F (14.3°C) in May.Humidity
The least humid month in Portal is May, with an average relative humidity of 21%.Rainfall
In Portal, in May, during 2.1 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. Throughout the year, there are 73.4 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Snowfall
In Portal, snow does not fall in April through October.Daylight
In May, the average length of the day is 13h and 48min.On the first day of the month, sunrise is at 5:29 am and sunset at 6:57 pm. On the last day of May, sunrise is at 5:11 am and sunset at 7:17 pm MST.
Sunshine
In May, the average sunshine is 11.7h.UV index
May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 7 during May translates into the following directions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Portal, AZ
- Average high temperature in May: 82.9°F
The warmest month (with the highest average high temperature) is June (92.8°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in May: 57.7°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (36.3°F).
Average pressure in May
Portal, AZ
- Average pressure in May: 29.87"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in May
Portal, AZ
- Average wind speed in May: 10.7mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is January (7.1mph).
Average humidity in May
Portal, AZ
- Average humidity in May: 21%
The month with the highest relative humidity is December (51%).
The month with the lowest relative humidity is May (21%).
Average rainfall in May
Portal, AZ
- Average rainfall in May: 0.16"
The wettest month (with the highest rainfall) is July (1.81").
The driest month (with the least rainfall) is April (0.12").
Average rainfall days in May
Portal, AZ
- Average rainfall days in May: 2.1 days
The month with the highest number of rainy days is July (15 days).
The month with the least rainy days is May (2.1 days).
Average snowfall in May
Portal, AZ
- Average snowfall in May: 0"
The month with the highest snowfall is December (0.79").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Portal, AZ
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is December (1.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Portal, AZ
- Average daylight in May: 13h and 48min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in May: 11h and 42min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in May
Portal, AZ
- Average sunshine days in May: 28.5 days
The month with the most sunshine days is May (28.5 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in May
Portal, AZ
- Average UV index in May: 7
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in May
Portal, AZ
- Average cloud cover in May: 8
The months with the most cloud cover are July and December (Cloud cover 20).
The month with the least cloud cover is May (Cloud cover 8).
Average visibility in May
Portal, 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).
