Cascais weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: June – September
What is the weather like in Cascais in January?
In January, Cascais is cool: daytime highs average 15 °C, and nights cool down to about 10 °C. The sea averages 15.4 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 71 mm in total. All in all, January is not an ideal month for a holiday in Cascais.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 21 | 22 | 28 |
| Day | 15° | 15° | 15° |
| Night | 11° | 10° | 10° |
| Sea | 16° | 15° | 15° |
| Sun | 6 h | 6 h | 7 h |
| Rain days | 10 | 9 | 7 |
More details for January
- Daylight
- 9 h 44 min07:54 – 17:38
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 23 km/haverage daily peak
- Cloud cover
- 54 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+0Europe/Lisbon
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %50 %
- Few rainy daysweight 20 %62 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in January
- A jumper for the evenings
- Rain jacket or umbrella
Cascais in January: quick answers
Is Cascais hot in January?
No. In January, Cascais is cool: daytime highs average 15 °C and nights drop to about 10 °C.
Can you swim in Cascais in January?
Only if you don't mind cold water: in January the sea averages just 15.4 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Cascais in January?
Rain is frequent, with about 9 rainy days and 71 mm in total.
Cascais month by month
The whole year in CascaisAll destinations: PortugalWhere to go in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)