May weather forecast
Lewiston, ME

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Weather in May

May marks the advent of somewhat stable and pleasurable weather in Lewiston. The city achieves an average maximum temperature of 63.1°F (17.3°C), which is notably warmer compared to previous months. Humidity and cloud coverage continue to dictate the city's weather conditions without drastic changes in levels. The hours of sunshine accumulate, offering a generally bright and cheerful ambiance. As May rolls on towards summer, Lewiston's weather begins its transition from moderate to warm.

Temperature

The shift into May is characterized by a rise in the average high-temperature, transitioning from April's fresh 50.2°F (10.1°C) to a comfortable 63.1°F (17.3°C). In the month of May, Lewiston witnesses a consistent average low-temperature of 44.1°F (6.7°C).

Humidity

The average relative humidity in May in Lewiston is 78%.

Rainfall

In Lewiston, Maine, 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 in Lewiston. During 0.1 snowfall days, in May, Lewiston aggregates 0.28" (7mm) of snow. In Lewiston, Maine, during the entire year, snow falls for 36.8 days and aggregates up to 18.31" (465mm) of snow.

Daylight

In Lewiston, the average length of the day in May is 14h and 47min.
On the first day of May in Lewiston, 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

The average daily maximum UV index in May in Lewiston is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: During May, 4 as the daily maximum UV index converts into the following advice:
Be vigilant - Preventing sunburn is recommended. When the Sun is at its strongest around midday, find shade and limit exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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Frequently asked questions

What are May temperatures in Lewiston?

An average high-temperature, in May, in Lewiston, is 63.1°F (17.3°C) and the average low-temperature is 44.1°F (6.7°C).

What is the average humidity in May in Lewiston?

In Lewiston, Maine, the average relative humidity in May is 78%.

How many days does it rain in May in Lewiston?

In Lewiston, Maine, in May, during 11.3 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

What is the last month it snows in Lewiston?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Lewiston aggregates 0.28" (7mm) of snow.

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

The average day length in May is 14h and 47min.

What time are sunrise and sunset in May in Lewiston?

On the first day of May in Lewiston, 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.

How long on average sun shines in May in Lewiston?

The average sunshine duration in May in Lewiston is 8h.

How high is the UV index in May in Lewiston?

In May, the average daily maximum UV index in Lewiston is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Lewiston, ME

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).

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Average pressure in May
Lewiston, ME

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).

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Average wind speed in May
Lewiston, ME

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).

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Average humidity in May
Lewiston, ME

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%).

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Average rainfall in May
Lewiston, ME

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").

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Average rainfall days in May
Lewiston, ME

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).

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Average snowfall in May
Lewiston, ME

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").

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Average snowfall days in May
Lewiston, ME

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).

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Average daylight in May /
Average sunshine in May
Lewiston, ME

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).

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Average sunshine days in May
Lewiston, ME

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).

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Average UV index in May
Lewiston, ME

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).

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Average cloud cover in May
Lewiston, ME

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).

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Average visibility in May
Lewiston, ME

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).

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Lewiston, Maine, USA

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