May weather forecastIndex, WA
May
Weather in May
May, the last month of the spring in Index, is a refreshing month, with an average temperature fluctuating between 40.1°F (4.5°C) and 60.4°F (15.8°C).Temperature
The shift into May is accompanied by a temperature increase, with the average high-temperature rising from a cool 51.1°F (10.6°C) in April to a refreshing 60.4°F (15.8°C). Index experiences a mean low-temperature of 40.1°F (4.5°C) during May.Humidity
In May, the average relative humidity in Index is 79%.Rainfall
In Index, during May, the rain falls for 17 days and regularly aggregates up to 2.76" (70mm) of precipitation. Throughout the year, there are 200.6 rainfall days, and 51.65" (1312mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Index.Daylight
In Index, Washington, the average length of the day in May is 15h and 11min.On the first day of the month, sunrise is at 5:46 am and sunset at 8:19 pm. On the last day of May, in Index, Washington, sunrise is at 5:11 am and sunset at 8:56 pm PDT.
Sunshine
The average sunshine in May is 8.4h.UV index
In Index, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In May, the maximum UV index of 4 translates into these guidelines:
Act with care - The suggestion to avoid sunburn is emphasized. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Index, WA
- Average high temperature in May: 60.4°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in May: 40.1°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in May
Index, 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
Index, WA
- Average wind speed in May: 3.4mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in May
Index, WA
- Average humidity in May: 79%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in May
Index, WA
- Average rainfall in May: 2.76"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in May
Index, WA
- Average rainfall days in May: 17 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in May
Index, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Index, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (5.2 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
Index, WA
- Average daylight in May: 15h and 12min
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 30min).
- Average sunshine in May: 8h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in May
Index, WA
- Average sunshine days in May: 11.1 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in May
Index, WA
- Average UV index in May: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in May
Index, WA
- Average cloud cover in May: 49
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in May
Index, 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).
