Weather in Portland: May
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Average day temperature: | 65.4°F |
| Average night temperature: | 51.0°F | |
 |
Number of sunny days: | 12 days |
| Day length: | 14.3 - 15.4 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 1.9 in. | |
| more information | ||
14 days
forecast
forecast
| Portland |
weather in
June
June
| Portland |
Air temperature in May, °F
Show year:
2026
2025
2024
The highest day temperature during May of 2026 was 87°F. At the same time the lowest night temperature was 42°F. Daily and nightly averages during May were 66.7°F and 52.1°F.
Sunny, partly cloudy and cloudy days
Mostly all days in May are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Portland in May is 1.7 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 4.3 mph It makes May one of the least windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 7.9.
Best time for vacation in Portland
Portland on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portland
Local time: 06:00
June 12, friday
0900
61°F
S
3 mph
3 mph
1200
73°F
S
6 mph
6 mph
1500
77°F
S
6 mph
6 mph
1800
77°F
S
8 mph
8 mph
2100
64°F
SE
5 mph
5 mph
June 13, saturday
0000
57°F
S
2 mph
2 mph
0300
52°F
S
3 mph
3 mph
0600
54°F
S
3 mph
3 mph
