Lewiston
Idaho, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Lewiston, ID

A scenic and dramatic landscape on both sides of the glorious Lewiston City in Idaho, and a clear view of the iconic Snake river passing through
A scenic and dramatic landscape on both sides of the glorious Lewiston City in Idaho, and a clear view of the iconic Snake river passing through
January, like December, in Lewiston, Idaho, is a wintry winter month, with temperature in the range of an average high of 41.5°F (5.3°C) and an average low of 29.7°F (-1.3°C). In January, the average high-temperature is essentially the same as in December - a still cold 41.5°F (5.3°C). Weather in January »
The last month of the winter, February, is a chilly month in Lewiston, Idaho, with temperature in the range of an average high of 46.6°F (8.1°C) and an average low of 30.9°F (-0.6°C). In February, the average high-temperature is essentially the same as in January - a chilly 46.6°F (8.1°C). Weather in February »

The first month of the spring, March, is a cool month in Lewiston, Idaho, with average temperature ranging between min 35.6°F (2°C) and max 54.9°F (12.7°C). In March, the average high-temperature marginally rises, from a frosty 46.6°F (8.1°C) in February, to a cool 54.9°F (12.7°C). Weather in March »

April in Lewiston, Idaho, is a comfortable spring month, with average temperature ranging between min 40.3°F (4.6°C) and max 62.2°F (16.8°C). In April, the average high-temperature marginally rises, from a cool 54.9°F (12.7°C) in March, to an enjoyable 62.2°F (16.8°C). Weather in April »

The last month of the spring, May, is an agreeable month in Lewiston, Idaho, with temperature in the range of an average high of 70.9°F (21.6°C) and an average low of 46.9°F (8.3°C). In Lewiston, the average high-temperature in May marginally rises, from an enjoyable 62.2°F (16.8°C) in April, to a pleasant 70.9°F (21.6°C). Weather in May »

June, the first month of the summer, in Lewiston, is a warm month, with average temperature ranging between max 78.4°F (25.8°C) and min 53.4°F (11.9°C). In Lewiston, Idaho, the average high-temperature slightly increases, from an agreeable 70.9°F (21.6°C) in May, to a warm 78.4°F (25.8°C). Weather in June »

July is a hot summer month in Lewiston, Idaho, with average temperature varying between 59.5°F (15.3°C) and 89.2°F (31.8°C). The warmest month is July, with an average high-temperature of 89.2°F (31.8°C) and an average low-temperature of 59.5°F (15.3°C). Weather in July »

August, the last month of the summer, in Lewiston, is also a hot month, with average temperature varying between 88.9°F (31.6°C) and 59.2°F (15.1°C). In Lewiston, Idaho, the average high-temperature in August is relatively the same as in July - a still tropical 88.9°F (31.6°C). Weather in August »

September, the first month of the autumn, in Lewiston, is also a moderately hot month, with temperature in the range of an average low of 51.1°F (10.6°C) and an average high of 78.3°F (25.7°C). In September, the average high-temperature drops, from a tropical 88.9°F (31.6°C) in August, to a moderately hot 78.3°F (25.7°C). Weather in September »

October, like September, in Lewiston, Idaho, is another enjoyable autumn month, with temperature in the range of an average low of 41.2°F (5.1°C) and an average high of 62.6°F (17°C). In Lewiston, the average high-temperature in October declines considerably, from a warm 78.3°F (25.7°C) in September, to an enjoyable 62.6°F (17°C). Weather in October »

The last month of the autumn, November, is also a frosty month in Lewiston, Idaho, with average temperature ranging between min 34.2°F (1.2°C) and max 48.2°F (9°C). In November, the average high-temperature significantly decreases, from an enjoyable 62.6°F (17°C) in October, to a frosty 48.2°F (9°C). Weather in November »

The first month of the winter, December, is also a wintry month in Lewiston, Idaho, with average temperature fluctuating between 39.6°F (4.2°C) and 28°F (-2.2°C). The coldest month is December, with an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 28°F (-2.2°C). Weather in December »

How many days does it rain in Lewiston?

In Lewiston, during the entire year, the rain falls for 102.7 days and collects up to 12.3" (311.4mm) of precipitation.

When does it snow in Lewiston?

Months with snowfall are January through March, November and December.

How many days does it snow in Lewiston?

Throughout the year, in Lewiston, Idaho, there are 9.3 snowfall days, and 9.2" (233.7mm) of snow is accumulated.

What is the month with the lowest UV index in Lewiston?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Lewiston, Idaho.

What is the rainiest month in Lewiston?

May is the month with the most rainfall. Rain falls for 10.6 days and accumulates 1.6" (40.9mm) of precipitation.

When are the longest days in Lewiston?

With an average of 15.8h of daylight, June has the longest days of the year in Lewiston, Idaho.

What are the months with the highest UV index in Lewiston?

June and July, with an average maximum UV index of 8, are months with the highest UV index in Lewiston, Idaho.

What is the warmest month in Lewiston?

The warmest month in Lewiston, Idaho, is July, with an average high-temperature of 89.2°F (31.8°C) and an average low-temperature of 59.5°F (15.3°C).

What is the driest month in Lewiston?

The month with the least rainfall is July when the rain falls for 4.6 days and typically collects 0.6" (16.3mm) of precipitation.

What month has the most sunshine in Lewiston?

With an average of 14h of sunshine, July has the most sunshine of the year.

What is the coldest month in Lewiston?

With an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 28°F (-2.2°C), December is the coldest month in Lewiston, Idaho.

What is the snowiest month in Lewiston?

December is the month with the most snowfall. Snow falls for 3.6 days and accumulates 3.3" (83.8mm) of snow.

What is the month with the shortest days in Lewiston?

With an average of 8.7h of daylight, December has the shortest days of the year.

What is the month with the least sunshine in Lewiston?

December has the least sunshine of the year in Lewiston, with an average of 2h of sunshine.
Average temperature - Lewiston, ID
Average rainfall - Lewiston, ID
Average rainfall days - Lewiston, ID

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).

Average snowfall - Lewiston, ID

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").

Average snowfall days - Lewiston, ID

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).

Average daylight / Average sunshine - Lewiston, ID