May weather forecast
Mountain Brook, WA

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Weather in May

May, the last month of the spring in Mountain Brook, is a refreshing month, with an average temperature varying between 41.4°F (5.2°C) and 62.8°F (17.1°C).

Temperature

An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a fresh 52.5°F (11.4°C) to a refreshing 62.8°F (17.1°C). Mountain Brook encounters an average low-temperature of 41.4°F (5.2°C) during May nights.

Humidity

The average relative humidity in May is 68%.

Rainfall

In Mountain Brook, Washington, during May, the rain falls for 12.8 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 152.5 rainfall days, and 26.93" (684mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in May is 14h and 58min.
On the first day of May, sunrise is at 5:51 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 8:47 pm PDT.

Sunshine

The average sunshine in May is 10.1h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 4 translates into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Mountain Brook in May?

The high-temperature, in May, in Mountain Brook, records 62.8°F (17.1°C), while the low-temperature is 41.4°F (5.2°C).

What is the average humidity in May in Mountain Brook?

In May, the average relative humidity is 68%.

How many days does it rain in May in Mountain Brook?

In Mountain Brook, Washington, in May, during 12.8 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When it does not snow in Mountain Brook?

In Mountain Brook, snow does not fall in May through October.

Does it snow in Mountain Brook 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 Mountain Brook?

In Mountain Brook, the average day length in May is 14h and 58min.

What time are sunrise and sunset in May in Mountain Brook?

On the first day of May in Mountain Brook, Washington, sunrise is at 5:51 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 8:47 pm PDT.

How many hours of sunshine does Mountain Brook have in May?

In Mountain Brook, the average sunshine duration in May is 10.1h.

What is the UV index reading in May in Mountain Brook?

In May, the average daily maximum UV index in Mountain Brook is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Mountain Brook, WA

Average temperature in May - Mountain Brook, WA
  • Average high temperature in May: 62.8°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (35.2°F).

  • Average low temperature in May: 41.4°F

The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).

Average pressure in May
Mountain Brook, WA

Average pressure in May - Mountain Brook, WA
  • Average pressure in May: 30"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).

Average wind speed in May
Mountain Brook, WA

Average wind speed in May - Mountain Brook, WA
  • Average wind speed in May: 5.9mph

The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

Average humidity in May
Mountain Brook, WA

Average humidity in May - Mountain Brook, WA
  • Average humidity in May: 68%

The months with the highest relative humidity are January, February and December (88%).
The months with the lowest relative humidity are July and August (58%).

Average rainfall in May
Mountain Brook, WA

Average rainfall in May - Mountain Brook, WA
  • Average rainfall in May: 1.38"

The wettest month (with the highest rainfall) is January (4.88").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in May
Mountain Brook, WA

Average rainfall days in May - Mountain Brook, WA
  • Average rainfall days in May: 12.8 days

The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (3.8 days).

Average snowfall in May
Mountain Brook, WA

Average snowfall in May - Mountain Brook, WA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (6.22").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in May
Mountain Brook, WA

Average snowfall days in May - Mountain Brook, WA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is December (6.5 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
Mountain Brook, WA

Average daylight in May / Average sunshine in May - Mountain Brook, WA
  • Average daylight in May: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in May: 10h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in May
Mountain Brook, WA

Average sunshine days in May - Mountain Brook, WA
  • Average sunshine days in May: 16.5 days

The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (8.8 days).

Average UV index in May
Mountain Brook, WA

Average UV index in May - Mountain Brook, WA
  • 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 and February (UV index 1).

Average cloud cover in May
Mountain Brook, WA

Average cloud cover in May - Mountain Brook, WA
  • Average cloud cover in May: 37

The months with the most cloud cover are January and February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 15).

Average visibility in May
Mountain Brook, WA

Average visibility in May - Mountain Brook, WA
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).

Mountain Brook, Washington, USA

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