May weather forecastPortland, TN
May
Weather in May
May, the last month of the spring in Portland, is a warm month, with an average temperature fluctuating between 76.6°F (24.8°C) and 58.1°F (14.5°C).Temperature
The start of May is characterized by a subtle increase in the average high-temperature, transitioning from an agreeable 68.2°F (20.1°C) in April to a moderately hot 76.6°F (24.8°C). Portland observes an average nighttime temperature of 58.1°F (14.5°C) during May.Humidity
The months with the highest humidity in Portland, Tennessee, are March, May and December, with an average relative humidity of 79%.Rainfall
In Portland, during May, the rain falls for 17.7 days and regularly aggregates up to 4.06" (103mm) of precipitation. Throughout the year, there are 177.4 rainfall days, and 44.61" (1133mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Portland, the average length of the day in May is 14h and 8min.On the first day of May, sunrise is at 5:51 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 5:29 am and sunset at 7:58 pm CDT.
Sunshine
The average sunshine in May in Portland is 9h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 during May translates into the following guidance:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Portland, TN
- Average high temperature in May: 76.6°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (42.8°F).
- Average low temperature in May: 58.1°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in May
Portland, TN
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in May
Portland, TN
- Average wind speed in May: 6.5mph
The windiest month (with the highest average wind speed) is February (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in May
Portland, TN
- Average humidity in May: 79%
The months with the highest relative humidity are March, May and December (79%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in May
Portland, TN
- Average rainfall in May: 4.06"
The wettest month (with the highest rainfall) is July (5.39").
The driest month (with the least rainfall) is November (2.56").
Average rainfall days in May
Portland, TN
- Average rainfall days in May: 17.7 days
The month with the highest number of rainy days is July (19.7 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in May
Portland, TN
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Portland, TN
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Portland, TN
- Average daylight in May: 14h and 6min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in May
Portland, TN
- Average sunshine days in May: 11.5 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in May
Portland, TN
- Average UV index in May: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in May
Portland, TN
- Average cloud cover in May: 41
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in May
Portland, TN
- Average visibility in May: 5mi
The months with the highest visibility are February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, May and July (5mi).
