May weather forecast and climate
Portland, AR

Weather in May

The last month of the spring, May, is a moderately hot month in Portland, Arkansas, with average temperature fluctuating between 64.8°F (18.2°C) and 81.5°F (27.5°C).

Temperature

In Portland, the average high-temperature marginally rises, from an agreeable 73°F (22.8°C) in April, to a moderately hot 81.5°F (27.5°C). In Portland, the average low-temperature is 64.8°F (18.2°C).

Heat index

The average heat index is estimated at a tropical 86.4°F (30.2°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, metabolic differences, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In May, the average relative humidity in Portland is 74%.

Rainfall

In Portland, it is raining for 15.1 days, with typically 3.35" (85mm) of accumulated precipitation. Throughout the year, in Portland, Arkansas, there are 158.8 rainfall days, and 40.67" (1033mm) of precipitation is accumulated.

Snowfall

April through October and December are months without snowfall in Portland.

Daylight

The average length of the day in Portland is 13.9h.

Sunshine

In May, the average sunshine in Portland is 9.9h.

UV index

In Portland, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Portland?

In May, the average high-temperature is 81.5°F (27.5°C), and the average low-temperature is 64.8°F (18.2°C). In May, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that calculates temperature value influenced by the moisture in the air, is calculated to 86.4°F (30.2°C).

What is the average humidity in May in Portland?

The average relative humidity in May in Portland, Arkansas, is 74%.

How much does it rain in Portland in May?

In Portland, in May, during 15.1 rainfall days, 3.35" (85mm) of precipitation is typically accumulated.

When it does not snow in Portland?

April through October and December are months without snowfall.

What is the average length of the day in May in Portland?

The average length of the day in May in Portland is 13.9h.

How long on average sun shines in May in Portland?

In Portland, the average sunshine in May is 9.9h.

What is the UV index reading in May in Portland?

The average daily maximum UV index in May in Portland, Arkansas, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Portland, AR

Average temperature in May - Portland, AR
  • Average high temperature in May: 81.5°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (51.6°F).

  • Average low temperature in May: 64.8°F

The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).

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Average pressure in May
Portland, AR

Average pressure in May - Portland, AR
  • Average pressure in May: 29.98"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.95").

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Average wind speed in May
Portland, AR

Average wind speed in May - Portland, AR
  • Average wind speed in May: 7.4mph

The windiest month (with the highest average wind speed) is February (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in May
Portland, AR

Average humidity in May - Portland, AR
  • Average humidity in May: 74%

Months with the highest relative humidity are February and March (79%).
The month with the lowest relative humidity is October (67%).

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Average rainfall in May
Portland, AR

Average rainfall in May - Portland, AR
  • Average rainfall in May: 3.35"

The wettest month (with the highest rainfall) is April (4.49").
The driest month (with the least rainfall) is November (2.44").

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Average rainfall days in May
Portland, AR

Average rainfall days in May - Portland, AR
  • Average rainfall days in May: 15.1 days

The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is October (9.3 days).

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Average snowfall in May
Portland, AR

Average snowfall in May - Portland, AR
  • Average snowfall in May: 0"

The month with the highest snowfall is February (0.43").
Months with the least snowfall are April, May, June, July, August, September, October and December (0").

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Average snowfall days in May
Portland, AR

Average snowfall days in May - Portland, AR
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (1.2 days).
Months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).

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Average daylight in May /
Average sunshine in May
Portland, AR

Average daylight in May / Average sunshine in May - Portland, AR
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 9.9h

The month with the most sunshine is June (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in May
Portland, AR

Average sunshine days in May - Portland, AR
  • Average sunshine days in May: 13.8 days

The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is July (12 days).

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Average UV index in May
Portland, AR

Average UV index in May - Portland, AR
  • Average UV index in May: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

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Average cloud cover in May
Portland, AR

Average cloud cover in May - Portland, AR
  • Average cloud cover in May: 31

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 25).

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Average visibility in May
Portland, AR

Average visibility in May - Portland, AR
  • Average visibility in May: 6mi

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

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