Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
A shift in the average high-temperature is noticeable in May, changing from an enjoyable 61.3°F (16.3°C) in April to a pleasant 71.2°F (21.8°C). Mattawa anticipates a considerable cooling off from the daytime high to an average minimum temperature of 49.1°F (9.5°C) in May.Humidity
In May, the average relative humidity is 48%.Rainfall
In Mattawa, in May, it is raining for 8.2 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, in Mattawa, Washington, there are 86.4 rainfall days, and 6.38" (162mm) of precipitation is accumulated.Snowfall
In Mattawa, snow does not fall in May through August and October.Daylight
In May, the average length of the day is 15h and 4min.On the first day of May in Mattawa, sunrise is at 5:43 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 5:09 am and sunset at 8:45 pm PDT.
Sunshine
The average sunshine in May is 11h.UV index
In Mattawa, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In May, the maximum UV index of 5 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What are May temperatures in Mattawa?
What is the average humidity in May in Mattawa?
How much does it rain in Mattawa in May?
When it does not snow in Mattawa?
Does it snow in Mattawa in May?
What is the average length of the day in May in Mattawa?
What time are sunrise and sunset in May in Mattawa?
How many hours of sunshine does Mattawa have in May?
What is the UV index intensity in May in Mattawa?
Average temperature in May
Mattawa, WA
- Average high temperature in May: 71.2°F
The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in May: 49.1°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure in May
Mattawa, WA
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in May
Mattawa, WA
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in May
Mattawa, WA
- Average humidity in May: 48%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (37%).
Average rainfall in May
Mattawa, WA
- Average rainfall in May: 0.71"
The wettest months (with the highest rainfall) are January and December (0.87").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in May
Mattawa, WA
- Average rainfall days in May: 8.2 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in May
Mattawa, WA
- Average snowfall in May: 0"
The month with the highest snowfall is December (3.43").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in May
Mattawa, 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 and August (0 days).
Average daylight in May /
Average sunshine in May
Mattawa, WA
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in May: 11h and 0min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in May
Mattawa, WA
- Average sunshine days in May: 20.9 days
The months with the most sunshine days are July and August (25.8 days).
The month with the least sunshine days is February (16 days).
Average UV index in May
Mattawa, WA
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Mattawa, WA
- Average cloud cover in May: 25
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in May
Mattawa, WA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Mattawa, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
