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
May's arrival signals a modest temperature shift, moving from a moderate 55.9°F (13.3°C) in April to a still refreshing 63.9°F (17.7°C). Despite drastic daily temperature oscillations, Foster cools down to an average low-temperature of 40.6°F (4.8°C) in May.Humidity
In Foster, the average relative humidity in May is 78%.Rainfall
In Foster, in May, during 13.8 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, there are 167.6 rainfall days, and 36.54" (928mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in May is 14h and 49min.On the first day of the month, sunrise is at 5:59 am and sunset at 8:15 pm. On the last day of May, sunrise is at 5:29 am and sunset at 8:47 pm PDT.
Sunshine
In Foster, the average sunshine in May is 8.3h.UV index
In Foster, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during May translates into these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the average humidity in May?
How many days does it rain in May?
When it does not snow?
Does it snow in Foster in May?
How many hours of daylight does Foster have in May?
What time are sunrise and sunset in May?
How many hours of sunshine does Foster have in May?
How high is the UV index in May?
Average temperature in May
Foster, OR
- Average high temperature in May: 63.9°F
The warmest month (with the highest average high temperature) is August (79.5°F).
The month with the lowest average high temperature is December (44.4°F).
- Average low temperature in May: 40.6°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in May
Foster, OR
- Average pressure in May: 30.03"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
Foster, OR
- Average wind speed in May: 4.1mph
The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in May
Foster, OR
- Average humidity in May: 78%
The months with the highest relative humidity are February, March and December (86%).
The month with the lowest relative humidity is August (66%).
Average rainfall in May
Foster, OR
- Average rainfall in May: 2.17"
The wettest month (with the highest rainfall) is December (5.47").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Foster, OR
- Average rainfall days in May: 13.8 days
The month with the highest number of rainy days is March (21.1 days).
The month with the least rainy days is July (4.1 days).
Average snowfall in May
Foster, OR
- Average snowfall in May: 0"
The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Foster, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (3.4 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
Foster, OR
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in May
Foster, OR
- Average sunshine days in May: 15.6 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in May
Foster, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in May
Foster, OR
- Average cloud cover in May: 49
The months with the most cloud cover are February and March (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in May
Foster, OR
- Average visibility in May: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are February and April (4mi).
Foster, Oregon, USA
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