Portland, OR Weather Forecast and Current Conditions

Day		Sky	High / Low	Precip	Wind	Humidity
Sat Jul 18		Sunny Close Hourly	81º / 58º	0%	NNW 9 mph	42%
4pm		Sunny	78º	0%	NNW 8 mph	43%
5pm		Sunny	79º	0%	NNW 8 mph	40%
6pm		Sunny	79º	0%	NNW 9 mph	40%
7pm		Sunny	78º	0%	NNW 9 mph	41%
8pm		Sunny	76º	1%	NNW 9 mph	47%
9pm		Clear	73º	1%	NNW 8 mph	53%
10pm		Clear	69º	1%	NW 7 mph	59%
11pm		Clear	67º	3%	NW 6 mph	64%
Sun Jul 19		Partly Cloudy View Hourly	87º / 60º	7%	NNW 9 mph	54%
12am		Clear	65º	4%	NW 5 mph	68%
1am		Clear	63º	5%	NW 5 mph	72%
2am		Clear	62º	6%	NNW 4 mph	75%
3am		Clear	60º	7%	NNW 3 mph	79%
4am		Partly Cloudy	59º	7%	NNW 4 mph	81%
5am		Partly Cloudy	59º	7%	NNW 5 mph	82%
6am		Partly Cloudy	59º	7%	NNW 4 mph	84%
7am		Partly Cloudy	59º	7%	NNW 5 mph	84%
8am		Mostly Cloudy	60º	6%	NNW 6 mph	79%
9am		Partly Cloudy	62º	4%	NNW 6 mph	74%
10am		Partly Cloudy	64º	3%	NNW 6 mph	70%
11am		Sunny	68º	1%	NNW 6 mph	62%
12pm		Sunny	73º	0%	NNW 6 mph	54%
1pm		Sunny	76º	0%	NNW 7 mph	47%
2pm		Sunny	80º	0%	NNW 8 mph	42%
3pm		Sunny	83º	0%	NNW 8 mph	37%
4pm		Sunny	85º	0%	NNW 9 mph	33%
5pm		Sunny	86º	0%	NNW 9 mph	31%
6pm		Mostly Sunny	86º	0%	NNW 9 mph	31%
7pm		Mostly Sunny	84º	0%	NNW 9 mph	35%
8pm		Mostly Sunny	81º	0%	NNW 8 mph	39%
9pm		Partly Cloudy	78º	1%	NNW 7 mph	46%
10pm		Partly Cloudy	74º	2%	NW 6 mph	53%
11pm		Partly Cloudy	72º	3%	NW 6 mph	57%
Mon Jul 20		Cloudy View Hourly	93º / 65º	5%	NW 4 mph	47%
12am		Partly Cloudy	69º	4%	NNW 5 mph	62%
1am		Mostly Cloudy	67º	4%	NNW 5 mph	66%
2am		Partly Cloudy	66º	5%	NNW 4 mph	70%
3am		Partly Cloudy	64º	5%	NNW 4 mph	73%
4am		Mostly Cloudy	63º	6%	NNW 4 mph	75%
5am		Cloudy	62º	6%	NNW 4 mph	78%
6am		Cloudy	61º	6%	NNW 3 mph	79%
7am		Cloudy	63º	5%	NNW 3 mph	76%
8am		Cloudy	65º	4%	NNW 4 mph	70%
9am		Cloudy	67º	2%	NNW 4 mph	66%
10am		Cloudy	70º	1%	NW 4 mph	61%
11am		Cloudy	73º	0%	NW 4 mph	54%
12pm		Cloudy	77º	0%	NW 4 mph	48%
1pm		Cloudy	81º	0%	NW 4 mph	41%
2pm		Cloudy	85º	0%	WNW 4 mph	36%
3pm		Mostly Cloudy	88º	0%	NW 4 mph	32%
Tue Jul 21		Partly Cloudy	98º / 70º	3%	NW 5 mph	43%
Wed Jul 22		Mostly Sunny	96º / 64º	12%	WNW 6 mph	43%
Thu Jul 23		Sunny	88º / 61º	3%	WSW 5 mph	51%
Fri Jul 24		Sunny	86º / 59º	4%	WSW 6 mph	53%
Sat Jul 25		Partly Cloudy	83º / 58º	4%	W 5 mph	53%

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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.

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