August weather forecast
Sisters, OR

Weather in August

The last month of the summer, August, is another warm month in Sisters, Oregon, with an average temperature fluctuating between 50.7°F (10.4°C) and 78.4°F (25.8°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still warm 78.4°F (25.8°C). The average low-temperature, in August, is 50.7°F (10.4°C).

Humidity

The months with the lowest humidity in Sisters are July and August, with an average relative humidity of 53%.

Rainfall

In August, the rain falls for 6.1 days. Throughout August, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 142.1 rainfall days, and 22.87" (581mm) of precipitation is accumulated.

Snowfall

June through August are months without snowfall.

Daylight

The average length of the day in August in Sisters is 13h and 58min.
On the first day of August, sunrise is at 5:54 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 7:44 pm PDT.

Sunshine

In Sisters, the average sunshine in August is 11.8h.

UV index

In Sisters, the average daily maximum UV index in August is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in August interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the temperature in August in Sisters?

In Sisters, Oregon, in August, the average high-temperature is 78.4°F (25.8°C), and the average low-temperature is 50.7°F (10.4°C).

What are the least humid months in Sisters?

The months with the lowest humidity in Sisters are July and August, with an average relative humidity of 53%.

What is the average humidity in August in Sisters?

In Sisters, the average relative humidity in August is 53%.

How much does it rain in Sisters in August?

In Sisters, during August, the rain falls for 6.1 days and regularly aggregates up to 0.51" (13mm) of precipitation.

When it does not snow in Sisters?

In Sisters, Oregon, snow does not fall in June through August.

Does it snow in Sisters in August?

In Sisters, Oregon, in August, it doesn't snow. In September, it regularly snows.

How many hours of daylight does Sisters have in August?

The average day length in August is 13h and 58min.

When are sunrise and sunset in August in Sisters?

On the first day of August in Sisters, sunrise is at 5:54 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 7:44 pm PDT.

How long on average sun shines in August in Sisters?

In August, the average sunshine duration is 11.8h.

How high is the UV index in August in Sisters?

In Sisters, Oregon, the average daily maximum UV index in August is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Sisters, OR

Average temperature in August - Sisters, OR
  • Average high temperature in August: 78.4°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (36.5°F).

  • Average low temperature in August: 50.7°F

The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).

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Average pressure in August
Sisters, OR

Average pressure in August - Sisters, OR
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).

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Average wind speed in August
Sisters, OR

Average wind speed in August - Sisters, OR
  • Average wind speed in August: 4.8mph

The windiest month (with the highest average wind speed) is February (6.1mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).

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Average humidity in August
Sisters, OR

Average humidity in August - Sisters, OR
  • Average humidity in August: 53%

The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are July and August (53%).

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Average rainfall in August
Sisters, OR

Average rainfall in August - Sisters, OR
  • Average rainfall in August: 0.51"

The wettest month (with the highest rainfall) is January (3.31").
The driest month (with the least rainfall) is July (0.35").

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Average rainfall days in August
Sisters, OR

Average rainfall days in August - Sisters, OR
  • Average rainfall days in August: 6.1 days

The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is July (5 days).

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Average snowfall in August
Sisters, OR

Average snowfall in August - Sisters, OR
  • Average snowfall in August: 0"

The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in August
Sisters, OR

Average snowfall days in August - Sisters, OR
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in August /
Average sunshine in August
Sisters, OR

Average daylight in August / Average sunshine in August - Sisters, OR
  • Average daylight in August: 13h and 58min

The month with the longest days is June (Average daylight: 15h and 28min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in August: 11h and 48min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in August
Sisters, OR

Average sunshine days in August - Sisters, OR
  • Average sunshine days in August: 21.8 days

The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is March (8.1 days).

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Average UV index in August
Sisters, OR

Average UV index in August - Sisters, OR
  • Average UV index in August: 4

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in August
Sisters, OR

Average cloud cover in August - Sisters, OR
  • Average cloud cover in August: 12

The months with the most cloud cover are January, February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in August
Sisters, OR

Average visibility in August - Sisters, OR
  • Average visibility in August: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

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