May weather forecastGresham, OR
May
Weather in May
The month of May brings a refreshing change to Gresham’s weather with warmer temperatures and the onset of the dry season. This month sees the city's lowest precipitation, down to 1.85" (47mm) compared to April's 3.27" (83mm). With a decrease in rainfall, May ushers in dryer and sunnier weather, paving the way for the summer months. As we move into June, the weather progressively warms up, promising brighter and sunnier days ahead.Temperature
Gresham in May experiences a slight uptick in the average high-temperature, adjusting from April's 57.7°F (14.3°C) to a still refreshing 66.2°F (19°C). Marked by a significant drop from the daytime highs, Gresham's average low-temperature in May stands at a frosty 43.3°F (6.3°C).Humidity
The average relative humidity in May is 73%.Rainfall
In May, the rain falls for 13.5 days. Throughout May, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 165.6 rainfall days, and 34.65" (880mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In May, the average length of the day is 14h and 56min.On the first day of May, sunrise is at 5:56 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:24 am and sunset at 8:50 pm PDT.
Sunshine
In May, the average sunshine is 8.8h.UV index
The average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 in May translates into these instructions:
Undertake protective steps - Recommendations to avoid sunburn are issued. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Gresham, OR
- Average high temperature in May: 66.2°F
The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in May: 43.3°F
The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).
Average pressure in May
Gresham, OR
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in May
Gresham, OR
- Average wind speed in May: 4.2mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in May
Gresham, OR
- Average humidity in May: 73%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).
Average rainfall in May
Gresham, OR
- Average rainfall in May: 1.85"
The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in May
Gresham, OR
- Average rainfall days in May: 13.5 days
The month with the highest number of rainy days is March (19.3 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in May
Gresham, OR
- Average snowfall in May: 0"
The month with the highest snowfall is March (1.73").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Gresham, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.8 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
Gresham, OR
- Average daylight in May: 14h and 54min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in May: 8h and 48min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and February (Average sunshine: 4h and 12min).
Average sunshine days in May
Gresham, OR
- Average sunshine days in May: 15.8 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is February (9.7 days).
Average UV index in May
Gresham, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Gresham, OR
- Average cloud cover in May: 47
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in May
Gresham, OR
- Average visibility in May: 5mi
The months with the highest visibility are August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, November and December (5mi).
