Portland, OR Weather Forecast and Current Conditions

Day		Sky	High / Low	Precip	Wind	Humidity
Sun Jun 28		Cloudy Close Hourly	69º / 55º	11%	WNW 9 mph	58%
1pm		Cloudy	63º	6%	WNW 3 mph	61%
2pm		Cloudy	66º	11%	WNW 5 mph	57%
3pm		Cloudy	67º	9%	WNW 6 mph	53%
4pm		Mostly Cloudy	68º	2%	WNW 8 mph	50%
5pm		Mostly Cloudy	68º	4%	WNW 9 mph	52%
6pm		Mostly Cloudy	67º	2%	WNW 9 mph	53%
7pm		Mostly Cloudy	66º	1%	NW 9 mph	54%
8pm		Partly Cloudy	64º	1%	NW 9 mph	57%
9pm		Partly Cloudy	62º	2%	NW 7 mph	61%
10pm		Partly Cloudy	60º	3%	WNW 6 mph	66%
11pm		Mostly Cloudy	59º	6%	WNW 5 mph	69%
Mon Jun 29		Cloudy View Hourly	68º / 54º	13%	SW 7 mph	67%
12am		Cloudy	58º	6%	WNW 4 mph	71%
1am		Cloudy	57º	5%	W 4 mph	73%
2am		Cloudy	57º	5%	W 4 mph	75%
3am		Cloudy	56º	6%	WSW 3 mph	77%
4am		Cloudy	56º	6%	SW 3 mph	77%
5am		Cloudy	56º	7%	SW 3 mph	79%
6am		Cloudy	56º	8%	SSW 3 mph	79%
7am		Cloudy	56º	7%	SSW 4 mph	82%
8am		Cloudy	56º	8%	SSW 5 mph	80%
9am		Cloudy	57º	13%	SW 6 mph	77%
10am		Cloudy	59º	9%	SW 6 mph	72%
11am		Cloudy	60º	5%	SW 5 mph	70%
12pm		Cloudy	61º	4%	SW 6 mph	67%
1pm		Cloudy	63º	4%	SW 6 mph	65%
2pm		Cloudy	64º	1%	SW 6 mph	63%
3pm		Cloudy	66º	2%	SW 6 mph	58%
4pm		Cloudy	66º	1%	SW 6 mph	56%
5pm		Cloudy	67º	1%	WSW 6 mph	55%
6pm		Cloudy	67º	1%	WSW 6 mph	54%
7pm		Cloudy	67º	0%	W 6 mph	53%
8pm		Cloudy	66º	1%	WNW 6 mph	55%
9pm		Cloudy	64º	2%	WNW 6 mph	59%
10pm		Mostly Cloudy	61º	3%	WNW 6 mph	64%
11pm		Mostly Cloudy	60º	4%	WNW 6 mph	67%
Tue Jun 30		Cloudy View Hourly	69º / 53º	8%	WSW 7 mph	61%
12am		Cloudy	59º	4%	WNW 5 mph	69%
1am		Mostly Cloudy	58º	5%	WNW 4 mph	72%
2am		Mostly Cloudy	57º	5%	WNW 4 mph	74%
3am		Cloudy	56º	8%	W 3 mph	76%
4am		Cloudy	56º	6%	WSW 3 mph	77%
5am		Cloudy	56º	6%	WSW 2 mph	79%
6am		Cloudy	55º	9%	SW 3 mph	80%
7am		Cloudy	55º	8%	SW 4 mph	79%
8am		Cloudy	56º	7%	SW 5 mph	76%
9am		Cloudy	57º	8%	WSW 5 mph	72%
10am		Cloudy	59º	8%	WSW 5 mph	68%
11am		Cloudy	60º	3%	WSW 5 mph	65%
12pm		Cloudy	61º	3%	SW 6 mph	62%
Wed Jul 1		Cloudy	70º / 51º	9%	W 6 mph	60%
Thu Jul 2		Mostly Cloudy	74º / 54º	5%	NW 6 mph	59%
Fri Jul 3		Mostly Sunny	78º / 54º	5%	NW 7 mph	57%
Sat Jul 4		Mostly Sunny	84º / 55º	5%	NNW 8 mph	52%
Sun Jul 5		Partly Cloudy	82º / 54º	3%	NNW 8 mph	50%

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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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