Portland, OR Weather Forecast and Current Conditions

Day		Sky	High / Low	Precip	Wind	Humidity
Mon Jun 8		Rain Close Hourly	60º / 55º	100%	SSE 11 mph	85%
11am		Light Rain	55º	81%	SSE 6 mph	84%
12pm		Rain	56º	93%	SE 5 mph	84%
1pm		Rain	56º	99%	ESE 6 mph	86%
2pm		Rain	57º	100%	SE 6 mph	87%
3pm		Rain	57º	100%	SE 7 mph	87%
4pm		Rain	58º	100%	SSE 8 mph	86%
5pm		Rain	59º	93%	SSE 10 mph	87%
6pm		Rain	60º	83%	S 11 mph	85%
7pm		Light Rain	60º	64%	SSW 12 mph	82%
8pm		Showers	60º	53%	SSW 13 mph	81%
9pm		Showers	60º	44%	SSW 13 mph	82%
10pm		Showers	59º	39%	SSW 14 mph	84%
11pm		Showers	59º	41%	SSW 15 mph	83%
Tue Jun 9		AM Showers View Hourly	63º / 50º	50%	WSW 12 mph	68%
12am		Showers	59º	35%	SSW 15 mph	84%
1am		Showers	58º	43%	SSW 15 mph	83%
2am		Light Rain	58º	65%	SSW 14 mph	83%
3am		Showers	57º	56%	SW 13 mph	83%
4am		Showers	57º	41%	SW 12 mph	83%
5am		Showers	57º	51%	SW 12 mph	84%
6am		Showers	56º	53%	SW 11 mph	86%
7am		Showers	56º	50%	SW 10 mph	88%
8am		Showers	56º	50%	SW 11 mph	86%
9am		Showers	58º	40%	SW 11 mph	83%
10am		Showers	58º	40%	WSW 11 mph	79%
11am		Mostly Cloudy	59º	18%	WSW 11 mph	71%
12pm		Mostly Cloudy	61º	8%	WSW 12 mph	63%
1pm		Mostly Cloudy	62º	5%	WSW 12 mph	61%
2pm		Mostly Cloudy	62º	4%	WSW 11 mph	59%
3pm		Mostly Cloudy	62º	3%	WSW 12 mph	58%
4pm		Mostly Cloudy	62º	3%	WSW 12 mph	55%
5pm		Mostly Cloudy	62º	2%	WSW 12 mph	55%
6pm		Mostly Cloudy	62º	4%	W 11 mph	56%
7pm		Mostly Cloudy	61º	3%	W 10 mph	57%
8pm		Mostly Cloudy	60º	2%	W 9 mph	59%
9pm		Mostly Cloudy	58º	3%	WSW 7 mph	63%
10pm		Mostly Cloudy	57º	4%	WSW 6 mph	68%
11pm		Mostly Cloudy	56º	6%	WSW 6 mph	70%
Wed Jun 10		Partly Cloudy View Hourly	68º / 48º	11%	WNW 6 mph	60%
12am		Mostly Cloudy	55º	6%	WSW 6 mph	74%
1am		Mostly Cloudy	54º	24%	SW 5 mph	77%
2am		Mostly Cloudy	53º	19%	SW 5 mph	81%
3am		Mostly Cloudy	52º	8%	SW 4 mph	84%
4am		Mostly Cloudy	52º	11%	SW 3 mph	86%
5am		Cloudy	52º	14%	SW 3 mph	86%
6am		Mostly Cloudy	51º	12%	SW 3 mph	87%
7am		Mostly Cloudy	52º	11%	SW 3 mph	86%
8am		Partly Cloudy	54º	10%	WSW 4 mph	79%
9am		Mostly Cloudy	55º	9%	W 5 mph	73%
10am		Cloudy	57º	9%	W 3 mph	70%
Thu Jun 11		Sunny	79º / 53º	6%	NNW 8 mph	52%
Fri Jun 12		Sunny	82º / 56º	4%	NNW 10 mph	51%
Sat Jun 13		Mostly Sunny	92º / 63º	3%	N 11 mph	41%
Sun Jun 14		Sunny	98º / 66º	1%	NNE 11 mph	31%
Mon Jun 15		Mostly Sunny	99º / 65º	0%	N 8 mph	30%

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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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