May weather forecast
Oregon City, OR

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Weather in May

May exhibits the true spirit of the spring season in Oregon City as the weather continues to warm. The city in May is characterized by blossoming flora under the increasingly common sunshine. A major shift observed in this month pertains to the considerable decrease of rainfall to 1.81" (46mm) over approximately 13.7 days. The moderate temperatures and low rainfall combine to make May one of the more favorable months for outdoor activities. By the month's end, the impending summer season's heat is perceptible.

Temperature

As May arrives, a slight rise in the average high-temperature is observed, moving from 58.5°F (14.7°C) in April to a still refreshing 66.6°F (19.2°C). Oregon City experiences a significant downturn from peak daytime temperatures throughout May, with the average low-temperature dipping to a chilly 43.5°F (6.4°C).

Humidity

In May, the average relative humidity is 74%.

Rainfall

In Oregon City, in May, during 13.7 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Oregon City, Oregon, during the entire year, the rain falls for 169.9 days and collects up to 32.76" (832mm) of precipitation.

Snowfall

In Oregon City, snow does not fall in April through October.

Daylight

In Oregon City, the average length of the day in May is 14h and 55min.
On the first day of May, sunrise is at 5:57 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:25 am and sunset at 8:50 pm PDT.

Sunshine

In Oregon City, the average sunshine in May is 9h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A daily high UV index of 4 in May leads to these guidelines:
Undertake precautions - Obligation exists to protect against skin and eye damage. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.

Frequently asked questions

What is the usual temperature for Oregon City in May?

The high-temperature in Oregon City during May is 66.6°F (19.2°C) and the low-temperature is 43.5°F (6.4°C).

What is the average humidity in May?

In Oregon City, Oregon, the average relative humidity in May is 74%.

How many days does it rain in May?

In May, the rain falls for 13.7 days. Throughout May, 1.81" (46mm) of precipitation is accumulated.

When it does not snow?

April through October are months without snowfall.

What is the average length of the day in May?

In Oregon City, the average day length in May is 14h and 55min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 5:57 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:25 am and sunset at 8:50 pm PDT.

How many hours of sunshine does Oregon City have in May?

In May, the average sunshine duration is 9h.

What is the UV index intensity in May?

In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
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
Oregon City, OR

Average temperature in May - Oregon City, OR
  • Average high temperature in May: 66.6°F

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (44.4°F).

  • Average low temperature in May: 43.5°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).

Average pressure in May
Oregon City, OR

Average pressure in May - Oregon City, OR
  • Average pressure in May: 30.03"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in May
Oregon City, OR

Average wind speed in May - Oregon City, OR
  • Average wind speed in May: 4.1mph

The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

Average humidity in May
Oregon City, OR

Average humidity in May - Oregon City, OR
  • Average humidity in May: 74%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).

Average rainfall in May
Oregon City, OR

Average rainfall in May - Oregon City, OR
  • Average rainfall in May: 1.81"

The wettest month (with the highest rainfall) is December (5.16").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in May
Oregon City, OR

Average rainfall days in May - Oregon City, OR
  • Average rainfall days in May: 13.7 days

The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (4 days).

Average snowfall in May
Oregon City, OR

Average snowfall in May - Oregon City, OR
  • Average snowfall in May: 0"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in May
Oregon City, OR

Average snowfall days in May - Oregon City, OR
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in May /
Average sunshine in May
Oregon City, OR

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

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in May: 9h and 0min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in May
Oregon City, OR

Average sunshine days in May - Oregon City, OR
  • Average sunshine days in May: 15.8 days

The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is February (8.1 days).

Average UV index in May
Oregon City, OR

Average UV index in May - Oregon City, OR
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in May
Oregon City, OR

Average cloud cover in May - Oregon City, OR
  • Average cloud cover in May: 46

The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).

Average visibility in May
Oregon City, OR

Average visibility in May - Oregon City, OR
  • Average visibility in May: 5mi

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

Oregon City, Oregon, USA

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