2021 Long Range Weather Forecast for Portsmouth, RI . Everything you need to be ready to step out prepared. See long range weather forecasts for the next 60 days from The Old Farmerâs Almanac! North wind 10 to 14 mph. Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for Portsmouth, RI, US with The Weather Network. Get the latest 7 Day weather for Portsmouth, RI, US including weather news, video, warnings and interactive maps from the weather experts. A chance of snow. Check out our current live radar and weather forecasts for Portsmouth, Rhode Island to help plan your day Know what's coming with AccuWeather's extended daily forecasts for Portsmouth, RI. Get the Portsmouth, RI local hourly forecast including temperature, RealFeel, and chance of precipitation. NOAA National Weather Service National Weather Service. Nearby Weather Stations. Want to know what the weather is now? Up to 90 days of daily highs, lows, and precipitation chances. Portsmouth, RI weekend weather forecast, high temperature, low temperature, precipitation, weather map from The Weather Channel and Weather.com Mostly cloudy throughout the day. Chance of precipitation is 40%. Find the most current and reliable 7 day weather forecasts, storm alerts, reports and information for [city] with The Weather Network. Location: Portsmouth, RI. January 21, 2021: Portsmouth weather forecast for now and the week ahead â Clear for the hour. Partly sunny, with a high near 34. Portsmouth, RI Weather History star_ratehome. Weather reports for over 50,000 U.S. locations includes current conditions, three-day forecasts, seven-day forecasts, hourly forecast tracking, weather history, weather radar and warnings. No precipitation throughout the week. No PWS. Share: Get the Long Range Weather for Your Location. Reset Map, or Add PWS.