Portland, OR Weather Forecast and Current Conditions

Day		Sky	High / Low	Precip	Wind	Humidity
Sat Jul 11		Partly Cloudy Close Hourly	79º / 60º	0%	W 9 mph	47%
1pm		Partly Cloudy	75º	0%	SW 7 mph	47%
2pm		Partly Cloudy	76º	0%	WSW 8 mph	43%
3pm		Partly Cloudy	77º	0%	W 7 mph	39%
4pm		Mostly Cloudy	78º	0%	W 9 mph	38%
5pm		Mostly Cloudy	77º	0%	WNW 9 mph	40%
6pm		Mostly Cloudy	75º	0%	WNW 10 mph	42%
7pm		Mostly Cloudy	73º	0%	NW 9 mph	44%
8pm		Partly Cloudy	69º	0%	NW 9 mph	51%
9pm		Partly Cloudy	67º	0%	NNW 6 mph	57%
10pm		Partly Cloudy	65º	0%	NW 4 mph	61%
11pm		Partly Cloudy	64º	0%	NW 3 mph	67%
Sun Jul 12		AM Clouds/PM Sun View Hourly	76º / 54º	10%	WNW 9 mph	57%
12am		Partly Cloudy	63º	0%	NW 3 mph	68%
1am		Mostly Cloudy	63º	10%	NNW 3 mph	70%
2am		Mostly Cloudy	62º	10%	NW 2 mph	72%
3am		Mostly Cloudy	62º	10%	SW 3 mph	73%
4am		Cloudy	61º	10%	SW 2 mph	74%
5am		Cloudy	61º	10%	SSE 2 mph	76%
6am		Cloudy	61º	10%	SSE 2 mph	77%
7am		Cloudy	61º	10%	S 3 mph	75%
8am		Cloudy	62º	10%	SSE 2 mph	72%
9am		Cloudy	63º	10%	SSW 3 mph	69%
10am		Cloudy	65º	0%	WSW 3 mph	66%
11am		Cloudy	66º	0%	W 3 mph	62%
12pm		Cloudy	68º	0%	NW 4 mph	58%
1pm		Mostly Cloudy	69º	0%	NW 5 mph	56%
2pm		Mostly Cloudy	71º	0%	NW 6 mph	51%
3pm		Partly Cloudy	73º	0%	NW 6 mph	44%
4pm		Partly Cloudy	74º	0%	NW 8 mph	44%
5pm		Partly Cloudy	75º	0%	NNW 8 mph	41%
6pm		Partly Cloudy	75º	0%	NNW 9 mph	41%
7pm		Partly Cloudy	73º	0%	NNW 10 mph	40%
8pm		Partly Cloudy	71º	0%	NNW 10 mph	45%
9pm		Mostly Clear	68º	0%	NNW 9 mph	50%
10pm		Clear	65º	0%	NNW 9 mph	55%
11pm		Clear	63º	0%	NW 9 mph	60%
Mon Jul 13		Sunny View Hourly	80º / 56º	10%	NNW 9 mph	50%
12am		Clear	61º	0%	NNW 7 mph	64%
1am		Clear	59º	10%	NNW 7 mph	67%
2am		Clear	58º	10%	NW 5 mph	70%
3am		Clear	57º	10%	NW 4 mph	73%
4am		Clear	56º	10%	NW 3 mph	75%
5am		Clear	55º	10%	NNW 2 mph	77%
6am		Mostly Sunny	55º	10%	NNW 2 mph	78%
7am		Partly Cloudy	56º	10%	NNW 4 mph	75%
8am		Partly Cloudy	58º	0%	N 4 mph	73%
9am		Partly Cloudy	59º	0%	NNW 4 mph	69%
10am		Sunny	62º	0%	NNW 4 mph	63%
Tue Jul 14		Sunny	83º / 59º	0%	NNW 9 mph	47%
Wed Jul 15		Mostly Sunny	83º / 60º	10%	NNW 9 mph	55%
Thu Jul 16		Partly Cloudy	83º / 61º	10%	NW 8 mph	57%
Fri Jul 17		Mostly Sunny	81º / 61º	10%	NW 8 mph	56%
Sat Jul 18		Partly Cloudy	81º / 61º	10%	NW 9 mph	57%
Sun Jul 19		Mostly Sunny	81º / 61º	10%	NW 7 mph	57%
Mon Jul 20		Mostly Sunny	83º / 61º	10%	NW 7 mph	58%

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General Weather Conditions in Portland, OR

The coast range provides limited shielding from the maritime influence of the Pacific Ocean. The Cascade Range provides a steep high slope for the lifting moisture-laden westerly winds, which produces heavy rainfall in the western Cascade piedmont region. They also form the barrier for the Columbia River basin region and dry continental air masses. Airflow is usually northwest in Portland in spring and summer and southeast in fall and winter, interrupted occasionally by outbreaks of dry continental air east through Cascade passes and across ridge tops. When such an outbreak occurs, extreme high or low temperatures are usually experienced in the Portland area.

Portland has a very definite winter rainfall climate. About 88 percent of the annual total occurs in October through May, nine percent in June and September, while only 3 percent comes in July and August. The average annual precipitation is 37.33 inches (948.2 mm). December is the wettest month, and July, the driest. Precipitation is mostly rain; on the average only 17 days each year have snow. Snowfall is seldom more than a couple of inches, and it generally lasts only a few days. The annual average is only seven inches (178 mm) with January having the most. Snowfall has fallen in every month from November through May. The greatest measured snowfall in 24 hours was just under 11 inches (279 mm) recorded in January 1971.

Each season is clearly marked. Winter is mild, cloudy and wet with southeast surface winds predominating. Summer is marked by mild temperature, with prevailing northwest winds and very little precipitation. Fall and spring are transitional in nature, with frequent periods of ground fog. An average of 18 days during October record foggy conditions while only three days during July can expect fog. At all times, incursions of marine-tempered air are a frequent moderating influence. Outbreaks of continental air from east of the Cascade Mountains flow through the Columbia Gorge at near sea level and spread into the Portland area associated with the movement of Pacific storms offshore on a northeast storm track. In winter this brings the coldest weather, and the extremes of low temperature are registered in the cold airmass. Freezing rain and ice glaze often are transitional effects. In summer the hot, dry, continental air brings the highest temperatures. Extreme temperatures below zero are very infrequent. The absolute lowest ever reached is 3°F below zero (-19.4°C) recorded in February 1950. Extreme temperatures above 100°F (37.8°C) have occurred during each month from May through September; the absolute highest temperature is 107°F (41.6°C) recorded in July 1942, July 1965 and August 1981. Temperatures 90°F (32.2°C) or higher are reached every year, but seldom persist for more than 2 or 3 days before the warm spell is broken by a flow of cool, moist air from the ocean. The average annual temperature for Portland is 53.9°F (12.1°C). The average maximum is 63°F (17.2°C) while the average minimum is 45°F (7.2°C).

Destructive storms are infrequent in the Portland area. Surface winds seldom exceed gale force. Thunderstorms are infrequent, occurring, on average, only seven days each year. Tornadoes with the funnel cloud reaching the ground are rare and there are rare occurrences of heavy rain even though winter rains may persist for days at a time. Ice forms occasionally, but it is seldom heavy enough to affect navigation seriously, although navigation by small craft may be difficult.