May weather forecastCascadia, OR

May

Weather in May

The last month of the spring, May, is a refreshing month in Cascadia, Oregon, with an average temperature varying between 63.9°F (17.7°C) and 40.6°F (4.8°C).

Temperature

The shift into May is accompanied by a modest temperature increase, with the average high-temperature edging up from a refreshing 55.9°F (13.3°C) in April to a comfortable 63.9°F (17.7°C). Cascadia anticipates a considerable drop in temperature at night in May, with an average low of 40.6°F (4.8°C).

Humidity

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

Rainfall

In Cascadia, in May, during 13.8 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Cascadia, during the entire year, the rain falls for 167.6 days and collects up to 36.54" (928mm) of precipitation.

Snowfall

In Cascadia, snow does not fall in May through October.

Daylight

In Cascadia, the average length of the day in May is 14h and 49min.
On the first day of the month, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of May, sunrise is at 5:28 am and sunset at 8:46 pm PDT.

Sunshine

In Cascadia, the average sunshine in May is 8.3h.

UV index

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 4 in May translates into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.

Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature during May is 63.9°F (17.7°C) and the low-temperature is 40.6°F (4.8°C).

In May, the average relative humidity is 78%.

In Cascadia, in May, it is raining for 13.8 days, with typically 2.17" (55mm) of accumulated precipitation.

In Cascadia, snow does not fall in May through October.

In May, it doesn't snow. April is the latest month when it typically snows.

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

On the first day of May, sunrise is at 5:59 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 5:28 am and sunset at 8:46 pm PDT.

In May, the average sunshine duration is 8.3h.

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

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

55.9°F

63.9°F

69.4°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5mph

4.5mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

9.8

15.6

17.4

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Cascadia, OR

Average high temperature in May: 63.9°F

The warmest month (with the highest average high temperature) is August (79.5°F).
The month with the lowest average high temperature is December (44.4°F).

Average low temperature in May: 40.6°F

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).

Average pressure in May
Cascadia, 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
Cascadia, OR

Average wind speed in May: 4.1mph

The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

Average humidity in May
Cascadia, OR

Average humidity in May: 78%

The months with the highest relative humidity are February, March and December (86%).
The month with the lowest relative humidity is August (66%).

Average rainfall in May
Cascadia, OR

Average rainfall in May: 2.17"

The wettest month (with the highest rainfall) is December (5.47").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in May
Cascadia, OR

Average rainfall days in May: 13.8 days

The month with the highest number of rainy days is March (21.1 days).
The month with the least rainy days is July (4.1 days).

Average snowfall in May
Cascadia, OR

Average snowfall in May: 0"

The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in May
Cascadia, OR

Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in May: 14h and 48min

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 18min

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