May weather forecast
Piedmont, WA

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Weather in May

May, the last month of the spring in Piedmont, is a moderate month, with temperature in the range of an average low of 40.5°F (4.7°C) and an average high of 56.8°F (13.8°C).

Temperature

The shift into May is marked by a modest rise in the average high-temperature, moving from April's chilly 48.2°F (9°C) to a mild 56.8°F (13.8°C). Piedmont's May nights cool down to an average low-temperature of 40.5°F (4.7°C).

Humidity

In Piedmont, Washington, the average relative humidity in May is 80%.

Rainfall

In May, the rain falls for 13.5 days. Throughout May, 1.26" (32mm) of precipitation is accumulated. Throughout the year, there are 150.3 rainfall days, and 17.36" (441mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Piedmont.

Daylight

The average length of the day in May is 15h and 13min.
On the first day of May, sunrise is at 5:55 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 9:06 pm PDT.

Sunshine

The average sunshine in May is 8.6h.

UV index

In May, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In May, a regular UV index of 3 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in May?

In Piedmont, 56.8°F (13.8°C) is the average high-temperature and 40.5°F (4.7°C) is the average low-temperature during May.

What is the average humidity in May?

In Piedmont, the average relative humidity in May is 80%.

How much does it rain in May?

In Piedmont, in May, it is raining for 13.5 days, with typically 1.26" (32mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

Does it snow in Piedmont in May?

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

What is the average length of the day in May?

In Piedmont, the average day length in May is 15h and 13min.

What time are sunrise and sunset in May?

On the first day of May, sunrise is at 5:55 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 9:06 pm PDT.

How many hours of sunshine does Piedmont have in May?

In Piedmont, the average sunshine duration in May is 8.6h.

What is the UV index reading in May?

In May, the average daily maximum UV index is 3. A UV Index reading 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
Piedmont, WA

Average temperature in May - Piedmont, WA
  • Average high temperature in May: 56.8°F

The warmest month (with the highest average high temperature) is August (69.1°F).
The month with the lowest average high temperature is December (39.4°F).

  • Average low temperature in May: 40.5°F

The month with the highest average low temperature is August (48.6°F).
The coldest months (with the lowest average low temperature) are February and December (31.5°F).

Average pressure in May
Piedmont, WA

Average pressure in May - Piedmont, WA
  • Average pressure in May: 30.04"Hg

The month with the highest atmospheric pressure is July (30.07"Hg).
The month with the lowest atmospheric pressure is March (29.99"Hg).

Average wind speed in May
Piedmont, WA

Average wind speed in May - Piedmont, WA
  • Average wind speed in May: 4.1mph

The windiest months (with the highest average wind speed) are January and November (5.2mph).
The calmest months (with the lowest average wind speed) are August and September (3.5mph).

Average humidity in May
Piedmont, WA

Average humidity in May - Piedmont, WA
  • Average humidity in May: 80%

The months with the highest relative humidity are January and December (89%).
The months with the lowest relative humidity are July and August (76%).

Average rainfall in May
Piedmont, WA

Average rainfall in May - Piedmont, WA
  • Average rainfall in May: 1.26"

The wettest month (with the highest rainfall) is January (3.35").
The driest months (with the least rainfall) are July and August (0.43").

Average rainfall days in May
Piedmont, WA

Average rainfall days in May - Piedmont, WA
  • Average rainfall days in May: 13.5 days

The month with the highest number of rainy days is March (16.1 days).
The month with the least rainy days is August (5.4 days).

Average snowfall in May
Piedmont, WA

Average snowfall in May - Piedmont, WA
  • Average snowfall in May: 0"

The month with the highest snowfall is February (4.53").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in May
Piedmont, WA

Average snowfall days in May - Piedmont, WA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (7.2 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
Piedmont, WA

Average daylight in May / Average sunshine in May - Piedmont, WA
  • Average daylight in May: 15h and 1min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in May: 8h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in May
Piedmont, WA

Average sunshine days in May - Piedmont, WA
  • Average sunshine days in May: 14 days

The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is February (9.6 days).

Average UV index in May
Piedmont, WA

Average UV index in May - Piedmont, WA
  • Average UV index in May: 3

The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in May
Piedmont, WA

Average cloud cover in May - Piedmont, WA
  • Average cloud cover in May: 46

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in May
Piedmont, WA

Average visibility in May - Piedmont, WA
  • Average visibility in May: 5mi

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

Piedmont, Washington, USA

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