May weather forecast
Corvallis, OR

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A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University
A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University

Weather in May

The transition into late spring in May sees Corvallis, Oregon heated up by warming temperatures. The city experiences less cloud cover, which results in more sunshine and consequently, higher UV index. The change in weather conditions encourages outdoor activities with its clear, sunny days and a remarkably low rainfall of 1.61" (41mm). Summer's imminent arrival is indicated by the lengthening daylight hours. Relative humidity, on a downward trend, prompts a drier atmosphere compared to the preceding months.

Temperature

May's arrival in Corvallis coincides with a marginal rise in the average high-temperature, moving from April's mild 57.2°F (14°C) to a comfortable 65.1°F (18.4°C). A stark contrast in day to night temperatures can be seen in May, with an average low-temperature of 41.5°F (5.3°C).

Humidity

The average relative humidity in May in Corvallis, Oregon, is 78%.

Rainfall

In Corvallis, in May, it is raining for 12.8 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 169.2 rainfall days, and 30.28" (769mm) of precipitation is accumulated.

Snowfall

In Corvallis, snow does not fall in April through October.

Daylight

In Corvallis, the average length of the day in May is 14h and 50min.
On the first day of the month, sunrise is at 6:01 am and sunset at 8:18 pm. On the last day of May, sunrise is at 5:31 am and sunset at 8:50 pm PDT.

Sunshine

In May, the average sunshine in Corvallis is 8h.

UV index

The average daily maximum UV index in May in Corvallis is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 4 during May translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
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Frequently asked questions

What are the temperatures in Corvallis in May?

Corvallis in May has an average high-temperature of 65.1°F (18.4°C) and an average low-temperature of 41.5°F (5.3°C).

What is the average humidity in May in Corvallis?

In May, the average relative humidity in Corvallis, Oregon, is 78%.

How many days does it rain in May in Corvallis?

In Corvallis, Oregon, during May, the rain falls for 12.8 days and regularly aggregates up to 1.61" (41mm) of precipitation.

When it does not snow in Corvallis?

April through October are months without snowfall in Corvallis.

What is the average length of the day in May in Corvallis?

In Corvallis, Oregon, the average day length in May is 14h and 50min.

What time are sunrise and sunset in May in Corvallis?

In May, on the first day of the month, sunrise is at 6:01 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:50 pm PDT.

How many hours of sunshine does Corvallis have in May?

The average sunshine duration in May is 8h.

What is the UV index reading in May in Corvallis?

In May, the average daily maximum UV index in Corvallis, Oregon, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Corvallis, OR

Average temperature in May - Corvallis, OR
  • Average high temperature in May: 65.1°F

The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (44.8°F).

  • Average low temperature in May: 41.5°F

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

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Average pressure in May
Corvallis, OR

Average pressure in May - Corvallis, OR
  • Average pressure in May: 30.04"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed in May
Corvallis, OR

Average wind speed in May - Corvallis, OR
  • Average wind speed in May: 4.4mph

The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).

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Average humidity in May
Corvallis, OR

Average humidity in May - Corvallis, OR
  • Average humidity in May: 78%

The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (69%).

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Average rainfall in May
Corvallis, OR

Average rainfall in May - Corvallis, OR
  • Average rainfall in May: 1.61"

The wettest month (with the highest rainfall) is December (4.8").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in May
Corvallis, OR

Average rainfall days in May - Corvallis, OR
  • Average rainfall days in May: 12.8 days

The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (4.5 days).

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Average snowfall in May
Corvallis, OR

Average snowfall in May - Corvallis, OR
  • Average snowfall in May: 0"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Corvallis, OR

Average snowfall days in May - Corvallis, OR
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
Corvallis, OR

Average daylight in May / Average sunshine in May - Corvallis, OR
  • Average daylight in May: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in May: 8h and 0min

The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).

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Average sunshine days in May
Corvallis, OR

Average sunshine days in May - Corvallis, OR
  • Average sunshine days in May: 17 days

The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in May
Corvallis, OR

Average UV index in May - Corvallis, OR
  • Average UV index in May: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Corvallis, OR

Average cloud cover in May - Corvallis, OR
  • Average cloud cover in May: 51

The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in May
Corvallis, OR

Average visibility in May - Corvallis, OR
  • Average visibility in May: 4mi

The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).

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Corvallis, Oregon, USA

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