May weather forecast
Sisters, OR

Weather in May

May, the last month of the spring in Sisters, is a mild month, with an average temperature varying between 39.2°F (4°C) and 60.1°F (15.6°C).

Temperature

In Sisters, Oregon, the average high-temperature in May increases from a frosty 49.8°F (9.9°C) in April to a moderate 60.1°F (15.6°C). The average low-temperature, in May, is 39.2°F (4°C).

Humidity

In May, the average relative humidity in Sisters is 66%.

Rainfall

In Sisters, during 15 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. Throughout the year, there are 142.1 rainfall days, and 22.87" (581mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Sisters, Oregon. May is the last month it regularly snows in Sisters. During 2.4 snowfall days, in May, Sisters aggregates 0.63" (16mm) of snow. Throughout the year, in Sisters, Oregon, there are 70.7 snowfall days, and 60.04" (1525mm) of snow is accumulated.

Daylight

In Sisters, the average length of the day in May is 14h and 49min.
On the first day of May in Sisters, sunrise is at 5:56 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 5:25 am and sunset at 8:42 pm PDT.

Sunshine

The average sunshine in May in Sisters is 10.6h.

UV index

In May, the average daily maximum UV index in Sisters is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Sisters?

In Sisters, Oregon, the average relative humidity in May is 66%.

How much does it rain in Sisters in May?

In Sisters, during May, the rain falls for 15 days and regularly aggregates up to 2.01" (51mm) of precipitation.

What is the last month it snows in Sisters?

May is the last month it regularly snows in Sisters, Oregon. During 2.4 snowfall days, in May, Sisters aggregates 0.63" (16mm) of snow.

How many hours of daylight does Sisters have in May?

The average day length in May in Sisters is 14h and 49min.

When are sunrise and sunset in May in Sisters?

On the first day of May in Sisters, sunrise is at 5:56 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 5:25 am and sunset at 8:42 pm PDT.

How long on average sun shines in May in Sisters?

In May, the average sunshine duration in Sisters is 10.6h.

What is the UV index intensity in May in Sisters?

The average daily maximum UV index in May in Sisters is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Sisters, OR

Average temperature in May - Sisters, OR
  • Average high temperature in May: 60.1°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 May: 39.2°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 May
Sisters, OR

Average pressure in May - Sisters, OR
  • Average pressure in May: 30"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 May
Sisters, OR

Average wind speed in May - Sisters, OR
  • Average wind speed in May: 5.5mph

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 May
Sisters, OR

Average humidity in May - Sisters, OR
  • Average humidity in May: 66%

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 May
Sisters, OR

Average rainfall in May - Sisters, OR
  • Average rainfall in May: 2.01"

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 May
Sisters, OR

Average rainfall days in May - Sisters, OR
  • Average rainfall days in May: 15 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 May
Sisters, OR

Average snowfall in May - Sisters, OR
  • Average snowfall in May: 0.63"

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 May
Sisters, OR

Average snowfall days in May - Sisters, OR
  • Average snowfall days in May: 2.4 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 May /
Average sunshine in May
Sisters, OR

Average daylight in May / Average sunshine in May - Sisters, OR
  • Average daylight in May: 14h and 49min

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 May: 10h and 36min

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 May
Sisters, OR

Average sunshine days in May - Sisters, OR
  • Average sunshine days in May: 11.9 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 May
Sisters, OR

Average UV index in May - Sisters, OR
  • Average UV index in May: 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 May
Sisters, OR

Average cloud cover in May - Sisters, OR
  • Average cloud cover in May: 33

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 May
Sisters, OR

Average visibility in May - Sisters, OR
  • Average visibility in May: 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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