January weather forecast
Lisbon, Portugal

Starting the year off, January in Lisbon, Portugal, typically experiences chillier temperatures, a cloudy sky, and frequent rainfall. This is the time when Lisbon sees the highest rainfall of the year, with an average of 100mm recorded. Although the days are shorter during this month, the sea still maintains a slightly mild temperature, which makes walks along the shore fairly pleasant. One can expect crisp mornings and cool evenings, with the conditions overall more suited to indoor activities. The UV index is at its lowest, indicating fewer daylight hours for sightseeing and outdoor activities.

Temperature

The coldest period is January, when temperatures fluctuate between an average high of 14.8°C and a low of 8.3°C.

Rainfall

In January, the rain falls for 14 days. Throughout January, 100mm of precipitation is accumulated. Throughout the year, there are 112 rainfall days, and 774mm of precipitation is accumulated.

Sea temperature

In Lisbon, Portugal, in January, the average water temperature is 15.8°C.
Note: Swimming in water that is 15.8°C is not enjoyable for most. Breathing becomes more challenging to manage as the water temperature dips from 21°C to 15°C.

Daylight

In January, the average length of the day is 9h and 49min.
On the first day of the month, sunrise is at 07:54 and sunset at 17:25. On the last day of January, in Lisbon, sunrise is at 07:43 and sunset at 17:56 WET.

Sunshine

January, February, November and December, with an average of 5h of sunshine, are months with the least sunshine in Lisbon.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Lisbon. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.
Note: An average maximum UV index of 2 in January leads to these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. To cut down UV radiation exposure by about half, sport a wide-brim hat.