The letters show the direction the wind is blowing from (on a standard 16-point compass). The arrow shows the direction the wind is blowing. Strong winds are shown in bold for speeds of 29 mph or more. Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull. This gives you a better idea of how the temperature will actually feel at the time. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.įeels like temperature considers other factors, such as wind speed and humidity. This number shows the air temperature for the time period. Ice forms occasionally, but it is seldom heavy enough to affect navigation seriously, although navigation by small craft may be difficult.Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail and drizzle) will fall from the sky at a certain time. 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. Thunderstorms are infrequent, occurring, on average, only seven days each year. The average maximum is 63☏ (17.2☌) while the average minimum is 45☏ (7.2☌).ĭestructive storms are infrequent in the Portland area. The average annual temperature for Portland is 53.9☏ (12.1☌). Temperatures 90☏ (32.2☌) 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. Extreme temperatures above 100☏ (37.8☌) have occurred during each month from May through September the absolute highest temperature is 107☏ (41.6☌) recorded in July 1942, July 1965 and August 1981. The absolute lowest ever reached is 3☏ below zero (-19.4☌) recorded in February 1950. Extreme temperatures below zero are very infrequent. In summer the hot, dry, continental air brings the highest temperatures. Freezing rain and ice glaze often are transitional effects. In winter this brings the coldest weather, and the extremes of low temperature are registered in the cold airmass. 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. At all times, incursions of marine-tempered air are a frequent moderating influence. An average of 18 days during October record foggy conditions while only three days during July can expect fog. Fall and spring are transitional in nature, with frequent periods of ground fog. Summer is marked by mild temperature, with prevailing northwest winds and very little precipitation. Winter is mild, cloudy and wet with southeast surface winds predominating. The greatest measured snowfall in 24 hours was just under 11 inches (279 mm) recorded in January 1971.Įach season is clearly marked. Snowfall has fallen in every month from November through May. The annual average is only seven inches (178 mm) with January having the most. Snowfall is seldom more than a couple of inches, and it generally lasts only a few days. Precipitation is mostly rain on the average only 17 days each year have snow.
December is the wettest month, and July, the driest. The average annual precipitation is 37.33 inches (948.2 mm).
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. Portland has a very definite winter rainfall climate. When such an outbreak occurs, extreme high or low temperatures are usually experienced in the Portland area. 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. They also form the barrier for the Columbia River basin region and dry continental air masses. 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. The coast range provides limited shielding from the maritime influence of the Pacific Ocean. General Weather Conditions in Portland, OR Expected precipitation is 1 percent, with current humidity at 67 percent, and air pressure at 29.78 in. With the wind and the atmosphere the temperature feels like 45° Fahrenheit. The wind is currently blowing at 5 miles per hour, and coming from the East Northeast. The current temperature is 47☏, and the expected high and low for today, Sunday, March 19, 2023, are 54° high temperature and 45☏ low temperature. The weather right now in Portland, OR is Partly Cloudy.
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