May weather forecastPortland, MO
May
Weather in May
The last month of the spring, May, is a warm month in Portland, Missouri, with an average temperature ranging between max 74.8°F (23.8°C) and min 55.8°F (13.2°C).Temperature
The start of May brings a rise in the average high-temperature, moving from a comfortable 65.1°F (18.4°C) in April to a moderately hot 74.8°F (23.8°C). In May, Portland experiences a temperature dip to an average of 55.8°F (13.2°C) at night.Humidity
The most humid month in Portland is May, with an average relative humidity of 78%.Rainfall
May is the month with the most rainfall. Rain falls for 16.4 days and accumulates 3.58" (91mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in May is 14h and 18min.On the first day of the month, sunrise is at 6:08 am and sunset at 7:59 pm. On the last day of May, in Portland, sunrise is at 5:43 am and sunset at 8:25 pm CDT.
Sunshine
In May, the average sunshine in Portland, Missouri, is 9.1h.UV index
In May, the average daily maximum UV index in Portland is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 5 during May morphs into the following directions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. 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
Average temperature in May
Portland, MO
- Average high temperature in May: 74.8°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in May: 55.8°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in May
Portland, MO
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Portland, MO
- Average wind speed in May: 7.4mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in May
Portland, MO
- Average humidity in May: 78%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Portland, MO
- Average rainfall in May: 3.58"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in May
Portland, MO
- Average rainfall days in May: 16.4 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6 days).
Average snowfall in May
Portland, MO
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Portland, MO
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (5.6 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
Portland, MO
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 6min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in May
Portland, MO
- Average sunshine days in May: 12.3 days
The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in May
Portland, MO
- 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
Portland, MO
- Average cloud cover in May: 39
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility in May
Portland, MO
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
