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
May comes with an increase, with the average high-temperature moving from a fresh 52.9°F (11.6°C) in April to an enjoyable 61.9°F (16.6°C). In May, Preston experiences a significant drop from daily zeniths to an average nighttime temperature of 40.1°F (4.5°C).Humidity
In Preston, the average relative humidity in May is 77%.Rainfall
In Preston, in May, it is raining for 14.7 days, with typically 1.93" (49mm) of accumulated precipitation. In Preston, during the entire year, the rain falls for 184.9 days and collects up to 39.96" (1015mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Preston, the average length of the day in May is 15h and 9min.On the first day of the month, sunrise is at 5:49 am and sunset at 8:20 pm. On the last day of May, sunrise is at 5:14 am and sunset at 8:56 pm PDT.
Sunshine
In May, the average sunshine is 8.6h.UV index
The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 4 in May translates into these instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
Does it snow in May?
What is the average length of the day in May?
When are sunrise and sunset in May?
How many hours of sunshine does Preston have in May?
What is the UV index intensity in May?
Average temperature in May
Preston, WA
- Average high temperature in May: 61.9°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is December (39.7°F).
- Average low temperature in May: 40.1°F
The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (29.8°F).
Average pressure in May
Preston, WA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in May
Preston, WA
- Average wind speed in May: 3.5mph
The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).
Average humidity in May
Preston, WA
- Average humidity in May: 77%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (71%).
Average rainfall in May
Preston, WA
- Average rainfall in May: 1.93"
The wettest month (with the highest rainfall) is January (6.1").
The driest months (with the least rainfall) are July and August (0.59").
Average rainfall days in May
Preston, WA
- Average rainfall days in May: 14.7 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (6.4 days).
Average snowfall in May
Preston, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Preston, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (5.4 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
Preston, WA
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).
Average sunshine days in May
Preston, WA
- Average sunshine days in May: 13.4 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in May
Preston, WA
- Average UV index in May: 4
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Preston, WA
- Average cloud cover in May: 49
The months with the most cloud cover are January, February, March and December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in May
Preston, WA
- Average visibility in May: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Preston, Washington, USA
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