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
May
Weather in May
Temperature
The start of May signals an increase in the average high-temperature, moving from a mild 60.4°F (15.8°C) in April to an agreeable 71.6°F (22°C). Washington, in May, witnesses an average low-temperature of 54.9°F (12.7°C).Humidity
In May, the average relative humidity in Washington is 77%.Rainfall
The month with the most rainfall in Washington is May, when the rain falls for 16.2 days and typically aggregates up to 2.6" (66mm) of precipitation.Snowfall
In Washington, snow does not fall in May through October.Daylight
In Washington, the average length of the day in May is 14h and 28min.On the first day of the month, sunrise is at 5:55 am and sunset at 7:54 pm. On the last day of May, in Washington, sunrise is at 5:28 am and sunset at 8:22 pm CDT.
Sunshine
In May, the average sunshine is 9h.UV index
In May, the average daily maximum UV index in Washington, Illinois, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 5 in May interprets into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures in Washington?
What is the average humidity in May in Washington?
What is the rainiest month in Washington?
How much does it rain in Washington in May?
When it does not snow in Washington?
Does it snow in Washington in May?
What is the average length of the day in May in Washington?
When are sunrise and sunset in May in Washington?
How long on average sun shines in May in Washington?
How high is the UV index in May in Washington?
Average temperature in May
Washington, IL
- Average high temperature in May: 71.6°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in May: 54.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in May
Washington, IL
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Washington, IL
- Average wind speed in May: 8.9mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in May
Washington, IL
- Average humidity in May: 77%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Washington, IL
- Average rainfall in May: 2.6"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in May
Washington, IL
- Average rainfall days in May: 16.2 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is January (4.4 days).
Average snowfall in May
Washington, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Washington, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Washington, IL
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Washington, IL
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in May
Washington, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Washington, IL
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in May
Washington, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).