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
A gentle upsurge in temperatures occurs as April gives way to May, with average highs shifting from a mild 56.5°F (13.6°C) to a comfortable 65.3°F (18.5°C). Throughout May, Forest Grove braces for a considerable drop from daytime highs, with an average low-temperature of 43°F (6.1°C).Humidity
In Forest Grove, the average relative humidity in May is 76%.Rainfall
In May, in Forest Grove, the rain falls for 14 days. Throughout May, 2.09" (53mm) of precipitation is accumulated. Throughout the year, in Forest Grove, there are 183.5 rainfall days, and 34.45" (875mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Forest Grove.Daylight
In Forest Grove, the average length of the day in May is 14h and 56min.On the first day of the month, sunrise is at 5:58 am and sunset at 8:19 pm. On the last day of May, in Forest Grove, sunrise is at 5:26 am and sunset at 8:53 pm PDT.
Sunshine
In May, the average sunshine in Forest Grove is 7.8h.UV index
The average daily maximum UV index in May in Forest Grove is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In May, a daily UV index of 4 turns into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Frequently asked questions
What are the temperatures in Forest Grove in May?
What is the average humidity in May in Forest Grove?
How many days does it rain in May in Forest Grove?
When it does not snow in Forest Grove?
What is the average length of the day in May in Forest Grove?
What time are sunrise and sunset in May in Forest Grove?
How long on average sun shines in May in Forest Grove?
What is the UV index intensity in May in Forest Grove?
Average temperature in May
Forest Grove, OR
- Average high temperature in May: 65.3°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in May: 43°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in May
Forest Grove, OR
- Average pressure in May: 30.04"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in May
Forest Grove, OR
- Average wind speed in May: 4.3mph
The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in May
Forest Grove, OR
- Average humidity in May: 76%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is August (69%).
Average rainfall in May
Forest Grove, OR
- Average rainfall in May: 2.09"
The wettest month (with the highest rainfall) is January (5.47").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in May
Forest Grove, OR
- Average rainfall days in May: 14 days
The month with the highest number of rainy days is March (21.4 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in May
Forest Grove, OR
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Forest Grove, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.9 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
Forest Grove, OR
- Average daylight in May: 14h and 5min
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: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 3h and 30min).
Average sunshine days in May
Forest Grove, OR
- Average sunshine days in May: 15.7 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in May
Forest Grove, OR
- Average UV index in May: 4
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in May
Forest Grove, OR
- Average cloud cover in May: 52
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in May
Forest Grove, OR
- Average visibility in May: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Forest Grove, Oregon, USA
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