Lewiston (ID) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Lewiston

Lewiston average temperature chart (Celsius) Lewiston average temperature chart (Fahrenheit)
Average monthly temperatures in Lewiston (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3.4 7.2 11 15.5 20.3 25.4 30.5 30.2 24.3 16.7 8.3 3.9
°F 38.1 45 51.8 59.9 68.6 77.7 86.9 86.4 75.7 62.1 46.9 39

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Lewiston monthly rainfall chart (mm) Lewiston monthly rainfall chart (inches)
Average monthly rainfall in Lewiston (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 41 29 34 33 37 35 17 21 21 29 39 40
inches 1.6 1.2 1.3 1.3 1.5 1.4 0.7 0.8 0.8 1.1 1.5 1.6
Rainy days 11 10 11 10 9 8 5 5 6 7 11 12

Average annual rainfall in Lewiston: 304.834mm (120 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Lewiston

Lewiston average daily sunshine chart
Average daily sunshine Lewiston
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.8 4.2 6.6 8.2 9.8 11.1 14.5 13 10.1 7 3.2 2.5

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Lewiston average minimum / maximum temperatures (Celsius) Lewiston average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Lewiston (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -3.4 -1.1 0.8 3.4 7 10.9 13.3 13.2 9 4.2 0.6 -2.7
Max °C 3.6 7.5 11.3 15.8 20.7 25.8 30.9 30.7 24.7 17.1 8.5 4.1
Min °F 26 30.1 33.4 38.1 44.5 51.5 55.9 55.7 48.1 39.5 33 27.2
Max °F 32.2 37.8 42.8 49.3 56.8 64.9 71.8 71.4 62.2 51.1 40.1 33.3

Sea temperature

The graph below shows the average sea temperature.

Lewiston average sea temperature chart (Celsius) Lewiston average sea temperature chart (Fahrenheit)
Average sea temperature around Lewiston in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.2 8.1 8.2 8.5 9.4 10.9 12.6 13.7 13.2 11.6 9.9 8.7
°F 46.8 46.6 46.8 47.3 48.9 51.6 54.7 56.7 55.8 53 49.9 47.6

Wind speed

The graph below shows the average wind speed.

Lewiston average winspeed by month (km/h) Lewiston average winspeed by month (mph)
Average wind speed in Lewiston (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 13 14 15 16 15 15 14 14 13 12 13 13
mph 8 9 9 10 9 9 9 9 8 8 8 8

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Lewiston relative humidity averages
Average relative humidity in Lewiston
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
81% 77% 67% 59% 56% 51% 41% 42% 52% 64% 79% 83%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Lewiston weather stats

Lewiston weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: July 17mm 0.7ins
Sunniest month: July 14.5hrs
Coldest month: January 3.4°C 38.1°F
Wettest month: January 41mm 1.6ins
Warmest sea: August 13.7°C 56.7°F
Map showing location of Lewiston (46.41655, -117.01766) Lewiston map pin © Google

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