Salem
Oregon, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Salem, OR

An evening shot of the leafy town of Salem in Oregon, with a clear dusk sky
An evening shot of the leafy town of Salem in Oregon, with a clear dusk sky
May, the last month of the spring, in Salem, is a comfortable month, with average temperature fluctuating between 66.7°F (19.3°C) and 42.8°F (6°C).

Temperature

In May, the average high-temperature slightly increases, from a mild 58.8°F (14.9°C) in April, to an enjoyable 66.7°F (19.3°C). The average low-temperature, in Salem, is 42.8°F (6°C).

Humidity

The average relative humidity is 76%.

Rainfall

In Salem, during 13.4 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Salem, during the entire year, the rain falls for 162.5 days and collects up to 25.08" (637mm) of precipitation.

Snowfall

April through October are months without snowfall in Salem.

Daylight

In May, the average length of the day is 14.9h.

Sunshine

In Salem, Oregon, the average sunshine in May is 8.6h.

UV index

The average daily maximum UV index in Salem, Oregon, is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Salem?

In May, in Salem, Oregon, the average high-temperature is 66.7°F (19.3°C), and the average low-temperature is 42.8°F (6°C).

What is the average humidity in May in Salem?

The average relative humidity in May is 76%.

How many days does it rain in May in Salem?

In Salem, during May, the rain falls for 13.4 days and regularly aggregates up to 1.46" (37mm) of precipitation.

When it does not snow in Salem?

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

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

In Salem, the average length of the day in May is 14.9h.

How long on average sun shines in May in Salem?

In May, the average sunshine in Salem is 8.6h.

How high is the UV index in May in Salem?

In Salem, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in May - Salem, OR
  • Average high temperature in May: 19.3°C

The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is December (7.5°C).

  • Average low temperature in May: 6°C

The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is December (1.4°C).

Average humidity in May - Salem, OR
  • Average humidity in May: 76%

Months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is August (65%).

Average rainfall in May - Salem, OR
  • Average rainfall in May: 37mm

The wettest month (with the highest rainfall) is December (100mm).
The driest month (with the lowest rainfall) is July (7mm).

Average rainfall days in May - Salem, OR
  • Average rainfall days in May: 13.4 days

The month with the highest number of rainy days is March (19.6 days).
The month with the lowest number of rainy days is July (3.9 days).

Average snowfall in May - Salem, OR
  • Average snowfall in May: 0mm

The month with the highest snowfall is February (30mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

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

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

Average daylight in May / Average sunshine in May - Salem, OR
  • Average daylight in May: 14.9h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in May: 8.6h

The month with most sunshine is August (Average sunshine: 11h).
The month with least sunshine is February (Average sunshine: 4.2h).

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

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