Williston
North Dakota, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Williston, ND

August, the last month of the summer, in Williston, is also a moderately hot month, with average temperature fluctuating between 54°F (12.2°C) and 83.8°F (28.8°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still warm 83.8°F (28.8°C). In August, the average low-temperature is 54°F (12.2°C).

Heat index

The average heat index in August is evaluated at a tropical 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, wind, differences in body mass, height, and shape, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

August is the least humid month, with an average relative humidity of 54.9%.

Rainfall

In August, in Williston, North Dakota, the rain falls for 8.2 days. Throughout August, 1.4" (36.8mm) of precipitation is accumulated. Throughout the year, there are 96.5 rainfall days, and 14.4" (364.9mm) of precipitation is accumulated.

Snowfall

In Williston snow does not fall in June through August.

Daylight

In August, the average length of the day in Williston is 14.2h.

Sunshine

In Williston, the average sunshine is 10.7h.

UV index

In August, the average daily maximum UV index in Williston is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in August in Williston?

The average high-temperature, in August, in Williston, North Dakota, is 83.8°F (28.8°C), while the average low-temperature is 54°F (12.2°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), that combines air temperature and relative humidity, in August is appraised at 86°F (30°C).

What is the least humid month in Williston?

With an average relative humidity of 54.9%, August is the least humid month in Williston, North Dakota.

What is the average humidity in August in Williston?

In August, the average relative humidity in Williston, North Dakota, is 54.9%.

How many days does it rain in August in Williston?

In Williston, North Dakota, in August, during 8.2 rainfall days, 1.4" (36.8mm) of precipitation is typically accumulated.

Does it snow in Williston in August?

In Williston, North Dakota, in August, it doesn't snow. In September, it regularly snows.

When it does not snow in Williston?

In Williston, North Dakota, snow does not fall in June through August.

What is the average length of the day in August in Williston?

In August, the average length of the day in Williston is 14.2h.

How long on average sun shines in August in Williston?

In Williston, North Dakota, the average sunshine in August is 10.7h.

What is the UV index reading in August in Williston?

In Williston, North Dakota, the average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in August - Williston, ND
  • Average high temperature in August: 83.8°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (21.9°F).

  • Average low temperature in August: 53.9°F

The month with the highest average low temperature is July (55.8°F).
The coldest month (with the lowest average low temperature) is January (0.1°F).

Average humidity in August - Williston, ND
  • Average humidity in August: 54.9%

The month with the highest relative humidity is December (77.1%).
The month with the lowest relative humidity is August (54.9%).

Average rainfall in August - Williston, ND
  • Average rainfall in August: 1.5"

Wettest months (with the highest rainfall) are June and July (2.5").
The driest month (with the lowest rainfall) is February (0.4").

Average rainfall days in August - Williston, ND
  • Average rainfall days in August: 8.2 days

The month with the highest number of rainy days is June (11.5 days).
The month with the lowest number of rainy days is February (6 days).

Average snowfall in August - Williston, ND
  • Average snowfall in August: 0"

The month with the highest snowfall is January (10").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in August - Williston, ND
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (9.1 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in August / Average sunshine in August - Williston, ND
  • Average daylight in August: 14.2h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.4h).

  • Average sunshine in August: 10.7h

The month with most sunshine is July (Average sunshine: 11.8h).
The month with least sunshine is December (Average sunshine: 4h).

Average UV index in August - Williston, ND
  • Average UV index in August: 7

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, February, November and December (UV index 1).