United StatesThe weather in May in Portland
It's pleasantly warm in May in Portland with an average temperature of 22°C. Temperatures this month range from a low of 19°C to a high of 25°C. At night, you can expect temperatures between 9°C and 13°C.
Looking for great weather? May is a good time to be in Portland. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in May for Portland, Oregon. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 34°C in 2023, Portland reached the highest temperature in May over the past 10 years. The lowest daytime temperature in this month was 11°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 3°C to a highest value of 17°C.
Rainfall amount
In May, there is an average of 42 mm of precipitation, spread over 8 days. The wind speed is around 3 Bft, mostly coming from the West.
Daily weather in May for Portland
Click on any day in May to get detailed info about the usual weather on that day in Portland. Check out the historical temperatures and precipitation over the past 10 years on this day.
May weather comparison
| Portland | New York | |
|---|---|---|
| Average temperature | 22°C | 22°C |
| Max. temperature | 25°C | 28°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 42 mm | 105 mm |
| Rainy days | 8 days | 14 days |
Start of May
The month of May starts in Portland with mild temps, averaging around 21°C during the day and nights around 10°C.
Mid May
By mid-May, daytime temps rise to around 22°C, with nights around 12°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of May
By the end of May, the average daytime temperature in Portland is around 23°C, while nighttime temps are about 12°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
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Temperature charts
These charts show the average temperatures in May in Portland, Oregon. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in May in Portland
Temperature in May in Portland over the years
Precipitation charts
These charts show the average amount of precipitation in May in Portland, Oregon. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in May in Portland
Total precipitation in May in Portland over the years
Daily UV index in May in Portland
This chart shows the average daily UV index in May in Portland, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in May in Portland
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Average weather in Portland by month
Click on a month below to see detailed weather info for Portland. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.