May Weather in Lewiston

Last updated: March 2, 2024

The weather in Lewiston, United States, during May is characterized by an average temperature of 15°C (59°F). Highs can soar to 31°C (88°F), while lows may dip to 2°C (35°F). Typically, the humidity level in Lewiston throughout May hovers around 81%.

2°C (35°F)

Minimum temperature

15°C (59°F)

Average temperature

31°C (88°F)

Maximum temperature

81%

Humidity

Precipitation and Sunshine hours

In May, Lewiston averages 62 mm (2.4 inches) of rainfall, typically over the course of 6 rainy days. The month enjoys an average of 14 hours 28 minutes of daylight, with the sun shining for approximately 11 hours 18 minutes each day. Additionally, there is a 75% probability of sunny days during this period.

62 mm (2.4 inches)

Precipitation

6 rainy days

Rainy days

11 hours 18 minutes

Sunshine hours

75%

Chance of sun

UV Index

In May, the UV Index in Lewiston reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00
UVI	1	2	4	6	9	10	11	10	9	6	4	2	1
Exposure	Low		Moderate	High	VeryHigh		Extreme	VeryHigh		High	Moderate	Low
Time to burn	45 min		30 min	25 min	15 min		10 min	15 min		25 min	30 min	45 min