Iwanai monthly weather averages

Contents

Average daytime temperature

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

Iwanai average temperature chart (Celsius) Iwanai average temperature chart (Fahrenheit)
Average monthly temperatures in Iwanai (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -4 -3.5 0.6 7.5 13.9 17.8 21.7 23.2 18.9 12.6 5.2 -1.1
°F 24.8 25.6 33 45.5 57 64 71.1 73.8 66.1 54.6 41.4 30.1

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.

Iwanai monthly rainfall chart (mm) Iwanai monthly rainfall chart (inches)
Average monthly rainfall in Iwanai (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 160 120 88 76 74 76 106 155 148 139 159 164
inches 6.3 4.7 3.4 3 2.9 3 4.2 6.1 5.8 5.5 6.2 6.4
Rainy days 30 27 26 18 18 17 17 18 18 20 25 29

Average annual rainfall in Iwanai: 1645.4mm (647.8 inches)

Average daily sunshine

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

Iwanai average daily sunshine chart
Average daily sunshine Iwanai
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.1 3 5 6.4 6.8 6.3 5.5 5.4 5.9 5.1 2.8 1.8

Day / night temperatures

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

Iwanai average minimum / maximum temperatures (Celsius) Iwanai average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Iwanai (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.8 -10.9 -6.8 -0.9 4.5 9.6 14.5 15.8 10.3 3.6 -2 -7.5
Max °C -3.9 -3.4 0.8 7.7 14.1 18 21.9 23.4 19.2 12.8 5.4 -0.9
Min °F 12.7 12.5 19.9 30.4 40.1 49.3 58.1 60.4 50.5 38.5 28.4 18.5
Max °F 18.9 19.2 26.6 38.1 48.7 56.8 64.8 67.3 58.5 46.8 35.1 24.4

Sea temperature

The graph below shows the average sea temperature.

Iwanai average sea temperature chart (Celsius) Iwanai average sea temperature chart (Fahrenheit)
Average sea temperature around Iwanai in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.8 5.1 5.3 6.9 9.9 14.1 18.5 21.7 21.1 17.4 13.3 9.7
°F 44.3 41.1 41.5 44.4 49.8 57.5 65.2 71.1 69.9 63.3 55.9 49.5

Wind speed

The graph below shows the average wind speed.

Iwanai average winspeed by month (km/h) Iwanai average winspeed by month (mph)
Average wind speed in Iwanai (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 14 13 13 13 13 12 11 11 10 13 14 14
mph 9 8 8 8 8 7 7 7 7 8 9 9

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.

Iwanai relative humidity averages
Average relative humidity in Iwanai
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
76% 75% 72% 71% 73% 80% 83% 82% 78% 73% 72% 75%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Iwanai weather stats

Iwanai weather statistics
Hottest month: August 23.2°C 73.8°F
Driest month: May 74mm 2.9ins
Sunniest month: April 6.4hrs
Coldest month: January -4°C 24.8°F
Wettest month: December 164mm 6.5ins
Warmest sea: August 21.7°C 71.1°F
Map showing location of Iwanai (42.97444, 140.50889) Iwanai map pin © Google

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