Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
Portsmouth experiences a temperature shift with the start of May, with average high-temperatures moving from a fresh 53.2°F (11.8°C) in April to an enjoyable 62.6°F (17°C). Throughout the month of May, Portsmouth witnesses an average temperature of 50.7°F (10.4°C).Humidity
In May, the average relative humidity is 79%.Rainfall
In Portsmouth, Rhode Island, in May, it is raining for 14.8 days, with typically 2.09" (53mm) of accumulated precipitation. Throughout the year, there are 148.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.Snowfall
January through March, May, November and December are months with snowfall. May is the first month it typically snows. Throughout May, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Portsmouth, during the entire year, snow falls for 22.9 days and aggregates up to 8.78" (223mm) of snow.Daylight
The average length of the day in May is 14h and 33min.On the first day of the month, sunrise is at 5:40 am and sunset at 7:43 pm. On the last day of May, sunrise is at 5:13 am and sunset at 8:12 pm EDT.
Sunshine
In May, the average sunshine is 8.5h.UV index
In Portsmouth, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 5 during May translates into the following guidance:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. 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. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the average humidity in May?
How much does it rain in May?
When does it start to snow?
What is the average length of the day in May?
When are sunrise and sunset in May?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Portsmouth, RI
- Average high temperature in May: 62.6°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in May: 50.7°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in May
Portsmouth, RI
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Portsmouth, RI
- Average wind speed in May: 9.6mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).
Average humidity in May
Portsmouth, RI
- Average humidity in May: 79%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).
Average rainfall in May
Portsmouth, RI
- Average rainfall in May: 2.09"
The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in May
Portsmouth, RI
- Average rainfall days in May: 14.8 days
The month with the highest number of rainy days is April (15.6 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in May
Portsmouth, RI
- Average snowfall in May: 0.08"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in May
Portsmouth, RI
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Portsmouth, RI
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in May
Portsmouth, RI
- Average sunshine days in May: 14.9 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in May
Portsmouth, RI
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in May
Portsmouth, RI
- Average cloud cover in May: 45
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Portsmouth, RI
- 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).
Portsmouth, Rhode Island, USA
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