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
May's onset brings a rise in the average high-temperature, moving from a cool 50.2°F (10.1°C) in April to a comfortable 63.1°F (17.3°C). Lewiston records an average nighttime low-temperature of 44.1°F (6.7°C) throughout May.Humidity
In Lewiston, the average relative humidity in May is 78%.Rainfall
In Lewiston, during May, the rain falls for 11.3 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Lewiston, during the entire year, the rain falls for 103.5 days and collects up to 14.96" (380mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Lewiston aggregates 0.28" (7mm) of snow. Throughout the year, in Lewiston, there are 36.8 snowfall days, and 18.31" (465mm) of snow is accumulated.Daylight
In Lewiston, the average length of the day in May is 14h and 47min.On the first day of May, sunrise is at 5:30 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 5:00 am and sunset at 8:16 pm EDT.
Sunshine
In Lewiston, the average sunshine in May is 8h.UV index
In Lewiston, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 4 during May translates into these guidelines:
Make use of precautions - It is urged to ward off sun damage. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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 many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When is the sunrise / sunset in May?
How long on average sun shines in May?
What is the UV index intensity in May?
Average temperature in May
Lewiston, ME
- Average high temperature in May: 63.1°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in May: 44.1°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in May
Lewiston, ME
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Lewiston, ME
- Average wind speed in May: 6.3mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in May
Lewiston, ME
- Average humidity in May: 78%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall in May
Lewiston, ME
- Average rainfall in May: 1.3"
The wettest month (with the highest rainfall) is October (1.69").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in May
Lewiston, ME
- Average rainfall days in May: 11.3 days
The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is February (4 days).
Average snowfall in May
Lewiston, ME
- Average snowfall in May: 0.28"
The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Lewiston, ME
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Lewiston, ME
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 8h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in May
Lewiston, ME
- Average sunshine days in May: 17.1 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (16.2 days).
Average UV index in May
Lewiston, ME
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in May
Lewiston, ME
- Average cloud cover in May: 49
The month with the most cloud cover is March (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 36).
Average visibility in May
Lewiston, ME
- Average visibility in May: 5mi
The months with the highest visibility are January, November and December (6mi).
The months with the lowest visibility are February, March, April, May, June, July, August, September and October (5mi).
Lewiston, Maine, USA
Weather forecast for your location
2. Allow the app to use your location