January weather forecast
Cascais, Portugal

January in Cascais, Portugal, boasts cooler, relatively mild conditions, coupled with considerable precipitation. Compared to December, January moderates slightly with average high and low temperatures of 14°C (57.2°F) and 8°C (46.4°F), respectively. The dominant environment feeds an aura of tranquility as rainfall peaks at 123mm (4.84") over approximately 15 days. The relative low sunlight exposure and temperatures reflect a perfect time for those seeking mild, slightly wetter weather. Moving into February, one can expect slightly warmer conditions as the calendar presses forward.

Temperature

January is the month when Cascais experiences its coldest temperatures, averaging a high of 14°C (57.2°F) and a low of 8°C (46.4°F).

Rainfall

The month with the most rainfall is January, when the rain falls for 15 days and typically aggregates up to 123mm (4.84") of precipitation.

Sea temperature

In Cascais, in January, the average water temperature is 15.8°C (60.4°F).
Note: Swimming in water that is 15.8°C (60.4°F) is not enjoyable for most. Breathing becomes more challenging to manage as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

In January, the average length of the day is 9h and 49min.
On the first day of the month, sunrise is at 07:55 and sunset at 17:26. On the last day of January, in Cascais, sunrise is at 07:44 and sunset at 17:57 WET.

Sunshine

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

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Cascais. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 2 in January leads to these recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.