It can be quite cool at this time of year, so visitors are recommended to take warmer clothes especially for venturing out after dark. The average daily maximum is 16 C and the average daily minimum is 9 C.
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Portugal's temperate climate means that any time of year is relatively comfortable for a visit. Although January and February will be a bit cooler and potentially wetter than the rest of the year, you can still experience some sun and take advantage of the thinner crowds.
In January the weather of the Algarve is pleasant, but as only reaching an average of 16C this is not beach or sunbathing weather. January may be the low season, but there are many good points to visiting Portugal at this time of the year.
January is the middle of winter in Greece, and temperatures are generally cool to cold, especially in the northern parts of the country. The average high temperature in Athens is around 14°C (57°F) during the day, while nighttime temperatures can drop to around 5°C (41°F).
Low season months of November to March are a cheaper time to visit. If you want to escape the crowds and enjoy rock-bottom prices on accommodations, plan your trip for the low season. Many museums and other attractions keep shorter hours, though you'll still find a full lineup of performances in cities and bigger towns ...
The cost of living in Portugal is generally considered about 46 percent cheaper than in the United States. This, coupled with the country's excellent quality of life, beautiful beaches, stunning mountain ranges, reliable public transport, and rich history and culture, make it very easy to fall in love with Portugal.
Big sister Lisbon is twice the size, more cosmopolitan, faster paced and 200 miles further south, so in summer it can be sweltering. Compact, walkable Porto has a more traditional feel and is cooled by Atlantic breezes through summer, though fog and rain can roll in via the same route during the winter.
To get a well-rounded experience of Portugal, it makes sense to try to visit both places. Ideally, I'd recommend three or four nights in Lisbon (in order to do a day trip to Sintra) and two nights in Porto. On the shortest itinerary I would plan on two nights in each city. Fly into one city and out of the other.
This one is a close call with both destinations seeing temperatures sitting in the balmy mid- to late-twenties during the summer months. Out of the peak season, the Greek island of Crete warms up as early as May hitting around 25C, while the Algarve isn't far behind at around 22C.
Travel by Train: The railway offers regular and direct services from Porto to Lisbon, and is the recommended means of travel. The fastest train (the Alfa Pendular service) takes 2h50minutes, while seats on the slightly slower Intercidades (intercity) service only cost €25.10 for an adult single.
January is right in the middle of Croatia's winter, so the weather's very cold at this time of year with temperatures often reaching freezing or below.
In January, Spain is quite cold and damp, with warmer temperatures in the south of the country and cooler weather in the north. If you plan your holidays to Spain at this time of year you'll need to pack a warm coat for the chilly evenings, along with a rain jacket in case of showers.