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
In Lewiston, stepping into May brings a temperature increase, moving up from April's chilly 49.1°F (9.5°C) to a moderate 59.7°F (15.4°C). With a notable difference from peak temperatures, an average of 37.8°F (3.2°C) marks the nights in Lewiston in May.Humidity
In May, the average relative humidity in Lewiston is 60%.Rainfall
In Lewiston, during May, the rain falls for 14.9 days and regularly aggregates up to 1.93" (49mm) of precipitation. In Lewiston, during the entire year, the rain falls for 117.9 days and collects up to 17.68" (449mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Lewiston, Utah. May is the last month it regularly snows. During 0.5 snowfall days, in May, Lewiston aggregates 0.2" (5mm) of snow. Throughout the year, there are 71.1 snowfall days, and 56.1" (1425mm) of snow is accumulated.Daylight
The average length of the day in May in Lewiston, Utah, is 14h and 35min.On the first day of the month, sunrise is at 6:22 am and sunset at 8:26 pm. On the last day of May, sunrise is at 5:54 am and sunset at 8:56 pm MDT.
Sunshine
The average sunshine in May is 10.7h.UV index
The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 4 during May translates into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Lewiston in May?
What is the average humidity in May in Lewiston?
How much does it rain in Lewiston in May?
What is the last month it snows in Lewiston?
What is the average length of the day in May in Lewiston?
When is the sunrise / sunset in May in Lewiston?
How long on average sun shines in May in Lewiston?
How high is the UV index in May in Lewiston?
Average temperature in May
Lewiston, UT
- Average high temperature in May: 59.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (28.6°F).
- Average low temperature in May: 37.8°F
The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in May
Lewiston, UT
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Lewiston, UT
- Average wind speed in May: 5.4mph
The windiest months (with the highest average wind speed) are April, June and August (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in May
Lewiston, UT
- Average humidity in May: 60%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (38%).
Average rainfall in May
Lewiston, UT
- Average rainfall in May: 1.93"
The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in May
Lewiston, UT
- Average rainfall days in May: 14.9 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is November (6.7 days).
Average snowfall in May
Lewiston, UT
- Average snowfall in May: 0.2"
The month with the highest snowfall is January (16.73").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Lewiston, UT
- Average snowfall days in May: 0.5 days
The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in May /
Average sunshine in May
Lewiston, UT
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 10h and 4min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in May
Lewiston, UT
- Average sunshine days in May: 12.8 days
The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in May
Lewiston, UT
- 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 and December (UV index 1).
Average cloud cover in May
Lewiston, UT
- Average cloud cover in May: 26
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in May
Lewiston, UT
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Lewiston, Utah, USA
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