Lewiston
Idaho, USA
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Lewiston, ID

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  • The average high temperature in May: 70.9°F

The warmest month (with the highest average high temperature) is July (89.3°F).
The month with the lowest average high temperature is December (39.5°F).

  • The average low temperature in May: 47°F

The month with the highest average low temperature is July (59.6°F).
The coldest month (with the lowest average low temperature) is December (28°F).

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  • The average rainfall in May: 1.6"

The wettest month (with the highest rainfall) is May (1.6").
The driest month (with the lowest rainfall) is July (0.6").

  • The average rainfall days in May: 10.6 days

The month with the highest number of rainy days is November (11.3 days).
The month with the lowest number of rainy days is August (4.1 days).

  • The average snowfall in May: 0"

The month with the highest snowfall is December (3.3").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

  • The average snowfall days in May: 0 days

The month with the highest number of snowfall days is December (3.6 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

  • The average daylight in May: 15h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in May: 9h

The month with most sunshine is July (Average sunshine: 14h).
The month with least sunshine is December (Average sunshine: 2h).

  • The average UV index in May: 7

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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