Alpharetta (GA) monthly weather averages

Contents

Average daytime temperature

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

Alpharetta average temperature chart (Celsius) Alpharetta average temperature chart (Fahrenheit)
Average monthly temperatures in Alpharetta (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.5 12.2 17.1 22.1 25.6 29 30.5 29.9 26.8 21.7 16.7 11.5
°F 49.2 54 62.9 71.7 78.1 84.2 86.9 85.9 80.3 71.1 62 52.8

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.

Alpharetta monthly rainfall chart (mm) Alpharetta monthly rainfall chart (inches)
Average monthly rainfall in Alpharetta (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 130 124 153 118 109 99 129 92 98 85 96 122
inches 5.1 4.9 6 4.6 4.3 3.9 5.1 3.6 3.9 3.3 3.8 4.8
Rainy days 12 10 11 9 10 10 12 9 8 7 9 10

Average annual rainfall in Alpharetta: 1302.833mm (512.9 inches)

Average daily sunshine

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

Alpharetta average daily sunshine chart
Average daily sunshine Alpharetta
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.3 6.1 7.2 8.7 9.5 9.9 9.2 8.8 8 7.8 6 5.1

Day / night temperatures

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

Alpharetta average minimum / maximum temperatures (Celsius) Alpharetta average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Alpharetta (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -1.2 0.3 4.8 8.8 13.3 17.5 19.7 19.4 15.9 9.4 4.7 0.6
Max °C 9.8 12.5 17.5 22.4 25.9 29.3 30.8 30.2 27.1 22.1 17 11.8
Min °F 29.8 32.5 40.6 47.8 55.9 63.5 67.4 66.9 60.6 48.8 40.4 33.1
Max °F 39.7 43.5 52 60.1 67.3 74.1 77.4 76.6 70.7 60.3 51.4 43.2

Sea temperature

The graph below shows the average sea temperature.

Alpharetta average sea temperature chart (Celsius) Alpharetta average sea temperature chart (Fahrenheit)
Average sea temperature around Alpharetta in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.4 12.7 13 15 18.6 23 26.2 26.9 25.5 21.8 18 15.3
°F 56.2 54.8 55.5 58.9 65.5 73.5 79.2 80.5 77.9 71.2 64.5 59.5

Wind speed

The graph below shows the average wind speed.

Alpharetta average winspeed by month (km/h) Alpharetta average winspeed by month (mph)
Average wind speed in Alpharetta (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 15 16 16 14 13 12 11 10 11 12 13 14
mph 9 10 10 9 8 7 7 7 7 7 8 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.

Alpharetta relative humidity averages
Average relative humidity in Alpharetta
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
69% 64% 63% 62% 69% 71% 75% 76% 75% 71% 70% 70%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Alpharetta weather stats

Alpharetta weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: October 85mm 3.3ins
Sunniest month: June 9.9hrs
Coldest month: January 9.5°C 49.1°F
Wettest month: March 153mm 6ins
Warmest sea: August 26.9°C 80.4°F
Map showing location of Alpharetta (34.07538, -84.29409) Alpharetta map pin © Google

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