Rialto (CA) monthly weather averages

Average daytime temperature

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

Rialto average temperature chart (Celsius) Rialto average temperature chart (Fahrenheit)
Average monthly temperatures in Rialto (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 18.5 20 20.1 22.8 25.4 29.5 34.1 34.1 31.3 27.2 22 18.5
°F 65.2 68 68.1 73 77.8 85.1 93.4 93.4 88.4 80.9 71.7 65.4

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.

Rialto monthly rainfall chart (mm) Rialto monthly rainfall chart (inches)
Average monthly rainfall in Rialto (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 78 68 63 31 10 1 1 4 9 10 41 53
inches 3.1 2.7 2.5 1.2 0.4 0.1 0 0.2 0.4 0.4 1.6 2.1
Rainy days 5 5 5 3 1 0 0 1 1 2 4 4

Average annual rainfall in Rialto: 285.466mm (112.4 inches)

Average daily sunshine

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

Rialto average daily sunshine chart
Average daily sunshine Rialto
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.8 8.5 9.1 10.6 10.2 11 12.3 11.8 10.3 9.2 8 7.7

Day / night temperatures

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

Rialto average minimum / maximum temperatures (Celsius) Rialto average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Rialto (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 4.2 5.5 6.2 7.9 11 13.7 16.7 17.1 14.9 11.3 7 4.1
Max °C 18.8 20.4 20.4 23.2 25.8 29.9 34.6 34.6 31.8 27.6 22.4 18.9
Min °F 39.6 41.8 43.2 46.1 51.8 56.7 62 62.7 58.7 52.3 44.6 39.4
Max °F 52.7 55.2 55.9 59.9 65.1 71.2 78.1 78.4 73.9 66.9 58.5 52.7

Sea temperature

The graph below shows the average sea temperature.

Rialto average sea temperature chart (Celsius) Rialto average sea temperature chart (Fahrenheit)
Average sea temperature around Rialto in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14.6 14.5 14.7 15 15.8 17.2 18.9 19.7 19.6 18.6 17 15.3
°F 58.2 58.1 58.4 58.9 60.5 62.9 66 67.5 67.3 65.6 62.6 59.6

Wind speed

The graph below shows the average wind speed.

Rialto average winspeed by month (km/h) Rialto average winspeed by month (mph)
Average wind speed in Rialto (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 11 12 14 15 14 14 14 13 13 12 11 11
mph 7 8 9 9 9 9 9 8 8 7 7 7

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.

Rialto relative humidity averages
Average relative humidity in Rialto
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
61% 61% 60% 57% 57% 58% 58% 60% 60% 60% 61% 62%