In September, the average high-temperature is practically the same as in August - a still warm 24.1°C (75.4°F). This is Portugal before the summer heat and crowds, and the first time in the year that visiting the beach is a viable option. Warmer ocean temperatures. Accommodation prices increase 30%. September weather forecast for Lisbon, Portugal. The weather in september in Portimao is dry ; it hardly ever rains (0.6in of precipitation over 2 days). In particular, May, June and September may have the the most desirable weather, with little rainfall. Here is a selection of travel guides: Expect big crowds in the Algarve and coastal resort areas. Get the monthly weather forecast for Lisbon, Lisboa, Portugal, including daily high/low, historical averages, to help you plan ahead. September Weather on the Azores & Madeira Islands: Average Temperature, Rainfall, Sunshine and Humidity The tables below list the normal September temperatures and rainfall on Portugal… 8:02 am WET How about a travel guide, so as not to miss a highlight of the southernmost region of continental Portugal? Shoulder (Apr–Jun & Sep–Nov) Wildflowers and mild days are ideal for hikes and outdoor activities. May is lovely in Portugal. Weather in Portugal in May. In September, the average low-temperature is 14.7°C (58.5°F). ... Porto, Porto, Portugal Monthly Weather. The northern coast of Portugal is the exception, with milder temperatures in summer. July and August usually see high temperatures, and sometimes a stifling heat. The mean September temperature is 72°F (22.2°C), the sea water's 66°F (18.9°C), and the sky is primarily clear. September sees the weather in Lisbon remain extremely warm. Thus, the mean temperature average on this month of september in Portimao is 76°F. In September, weather conditions in Portugal make it a good trip destination. Are you planning a holiday with hopefully nice weather to the Algarve in September 2020? Lively festivals take place in … The climate quite comfortable there september. Temperature. On average, the recorded minimum temperature is 72°F. What's the weather like in Lisbon in September. You will see several days, at … The average temperature still reaches a high of 26°C (that's about 79°F), and never dips any lower than 17°C (about 63°F). Temperatures are up to 81°F. Sweltering temperatures are commonplace. Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, precipitation and more. Average temperatures across the country are a very pleasant 24°C and, with 14 hours of sunshine per day, you’ll have plenty of time to enjoy the top sights and the beaches. 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