August weather forecastGrafton, WI
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Grafton, Wisconsin, with an average temperature ranging between min 62.4°F (16.9°C) and max 75.4°F (24.1°C).Temperature
Grafton records an average high-temperature of a still moderately hot 75.4°F (24.1°C) in August, closely mirroring the climate of the previous month. Grafton, in August, experiences an average temperature of 62.4°F (16.9°C) at night.Humidity
In August, the average relative humidity is 79%.Rainfall
In August, the rain falls for 15.2 days. Throughout August, 2.32" (59mm) of precipitation is accumulated. Throughout the year, there are 134.9 rainfall days, and 23.94" (608mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in Grafton.Daylight
In Grafton, the average length of the day in August is 13h and 55min.On the first day of the month, sunrise is at 5:42 am and sunset at 8:13 pm. On the last day of August, sunrise is at 6:15 am and sunset at 7:28 pm CDT.
Sunshine
The months with the most sunshine are July and August, with an average of 10.4h of sunshine.UV index
In Grafton, the average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during August leads to these advisories:
Take necessary precautions - Defending against sun damage is advocated. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Grafton, WI
- Average high temperature in August: 75.4°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is January (25.5°F).
- Average low temperature in August: 62.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in August
Grafton, WI
- Average pressure in August: 29.96"Hg
The months with the highest atmospheric pressure are January, February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in August
Grafton, WI
- Average wind speed in August: 7.6mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in August
Grafton, WI
- Average humidity in August: 79%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April, October and November (77%).
Average rainfall in August
Grafton, WI
- Average rainfall in August: 2.32"
The wettest month (with the highest rainfall) is July (2.99").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in August
Grafton, WI
- Average rainfall days in August: 15.2 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in August
Grafton, WI
- Average snowfall in August: 0"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Grafton, WI
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Grafton, WI
- Average daylight in August: 13h and 54min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 10h and 24min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in August
Grafton, WI
- Average sunshine days in August: 12.6 days
The month with the most sunshine days is December (16.4 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in August
Grafton, WI
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in August
Grafton, WI
- Average cloud cover in August: 28
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in August
Grafton, WI
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
