Monthly Weather in Portland, United States
What is the average monthly temperature in Portland?
The average monthly temperature in Portland, Oregon, United States ranges from 5°C (41°F) in February to 23.3°C (73.9°F) in August. Portland temperature by month is given in the table below.
| Month | Celsius | Fahrenheit |
|---|---|---|
| January | 6.1°C | 43.0°F |
| February | 5.0°C | 41.0°F |
| March | 7.1°C | 44.8°F |
| April | 10.6°C | 51.1°F |
| May | 17.3°C | 63.1°F |
| June | 18.4°C | 65.1°F |
| July | 22.3°C | 72.1°F |
| August | 23.3°C | 73.9°F |
| September | 18.4°C | 65.1°F |
| October | 13.9°C | 57.0°F |
| November | 8.5°C | 47.3°F |
| December | 7.8°C | 46.0°F |
What is the hottest month in Portland?
The hottest months in Portland are August, July and June. During August the average temperature outside is 23.3°C (73.9°F), in July it is 22.3°C (72.1°F) and during June the air temperature is around 18.4°C (65.1°F).
What is the coldest month in Portland?
The coldest months in Portland are February, January and March. In February the average air temperature drops to 5°C (41°F), in January air temperature is 6.1°C (43°F) and during March it is 7.1°C (44.8°F).
How much does it rain on average in Portland?
On average it rains for 12 month(s) in Portland, United States with an average of 13.1 days of rain per month. In total Portland has 157 rainy days in a year.
When does it rain the most in Portland?
In Portland it rains the most during the following months.
- December - on average 6.91mm (0.27 inches) of rainfall per day.
- April - on average 4.31mm (0.17 inches) of rainfall per day.
- November - on average 4.3mm (0.17 inches) of rainfall per day.
- March - on average 3.53mm (0.14 inches) of rainfall per day.
- January - on average 2.69mm (0.11 inches) of rainfall per day.
- February - on average 2.08mm (0.08 inches) of rainfall per day.
Does it snow in Portland?
Yes, it snows in Portland. The following months have the most amount of snow.
- February. Portland has 0.75mm (0.03 inches) of snowfall and 1.15 mm (0.05 inches) of snow on the ground in February.
- March. Portland has 0.02mm (0 inches) of snowfall and 0.04 mm (0 inches) of snow on the ground in March.
When is it windy in Portland?
The windiest months in Portland, United States are March, December and January. In March the average windspeed is 21.8 km/h (13.5 mph), during December the windspeed is 21.1 km/h (13.1 mph) and in January the windspeed is 21 km/h (13 mph).
What are the least windy months in Portland?
The least windy months in Portland are August, September and October. In August the average windspeed is 15.2 km/h (9.4 mph), during September the windspeed is 15.5 km/h (9.6 mph) and in October the windspeed is 16.2 km/h (10.1 mph).
When is it cloudy in Portland?
The cloudiest months in Portland, United States are January, March and December. On average in January 80% of sky is covered by clouds, in March 78.2% is covered by clouds and in December clouds cover about 77.1% of sky.
When does Portland have the clearest sky?
Portland has the clearest sky in July, June and August. In July 22.5% of sky is covered by clouds, in June clouds cover around 37.1% and during August clouds cover about 39% of sky.
What is the average daylight duration in Portland?
The average daylight duration in Portland is 12 hours 13 minutes 23 seconds.
Which months have the most daylight in Portland?
The longest days in Portland are during June, July and May.
- June - 15 hours 37 minutes 18 seconds of daylight.
- July - 15 hours 16 minutes 2 seconds of daylight.
- May - 14 hours 55 minutes 3 seconds of daylight.
Which months have the least daylight in Portland?
The shortest days in Portland are during December, January and November.
- December - 8 hours 46 minutes 20 seconds of daylight.
- January - 9 hours 10 minutes 39 seconds of daylight.
- November - 9 hours 31 minutes 0 seconds of daylight.
What are the humidity levels in Portland throughout the year?
Humidity levels in Portland, United States range from 52.3% in July to 78.9% in December.
What are the pressure levels in Portland throughout the year?
Pressure levels in Portland change from 1014.2 mb (millibars) in March to 1019.8 mb in November.
What is the visibility in Portland throughout the year?
Visibility in Portland changes from lowest 13.3 km (8.3 miles) in December to highest 15.9 km (9.9 miles) in June.
What are the UV levels in Portland throughout the year?
UV levels change in Portland from 0.9 in December to 7.2 in July.
Which months have the highest UV levels in Portland throughout the year?
In Portland, United States the highest UV index is during July, June and August. During July the average UV index is 7.2, in June UV level is 6.3 and in August UV index is around 5.6.
Which months have the lowest UV levels in Portland throughout the year?
The lowest UV levels in Portland are in December, January and February. In December the average UV index is around 0.9, in January UV index is 1 and during February UV level is 1.6.