30-day weather outlook for Portland (97229), Oregon. See periods over the next 30 days with elevated rain risk to help plan around wetter days. 30-Day Weather forecast for Portland, Oregon. Includes daily highs, lows, and probability of precipitation for the entire month. Portland, Oregon Extended 30 Day Weather Forecast for daily high/low temperatures, chance of precipitation and more so you can plan ahead. Free 30 day calculator to add or subtract exactly 30 days from any date. Switch forward or reverse modes and see weekday, weeks, and weekend breakdowns. Date Calculator Days Between Two Dates Find the number of years, months, weeks, and days between dates. Click Settings to define holidays. Weather.com brings you the most accurate monthly weather forecast for Portland, Oregon 97231 with average/record and high/low temperatures, precipitation and more. The Date Calculator adds or subtracts days, weeks, months and years from a given date. Calculate the date by adding ?php echo e(30); ? days from today. This simple Date calculator will allow you to quickly determine any date from today. 30-day weather outlook for Portland, Oregon. See periods over the next 30 days with elevated rain risk to help plan around wetter days. See the long range weather forecast for Portland, Check the 30 days forecast view, select a month and get the average expected weather for Portland.