Cascais weather by month & the best time to visit
Portugal · seaside town · Mediterranean climate
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The best time to visit Cascais is July — its sunniest month (Sunshine Score 96/100), with August and June close behind. Cascais averages about 2,985 hours of sunshine a year. Daytime highs around 22°C / 72°F and roughly 3 mm of rain in July.
When is the best time to visit Cascais?
For sunshine, the best time to visit Cascais is July, then August and June. The dullest month is January (42/100, 65 mm of rain). The full month-by-month picture is in the table below.
How sunny is Cascais?
Cascais gets a lot of sun: around 2,985 hours a year. 54 Sunshine Score points separate July (96) from January (42), so the month you pick matters. It ranks #4 of 19 destinations in Portugal for annual sunshine, above the national median of 2,683 hours. Rain has a clear season: the wettest stretch, around November, carries about 43% of the annual 541 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 42 | 14° / 57°F | 11° / 52°F | 65 mm | 2 | 15° / 59°F |
| February | 44 | 14° / 57°F | 10° / 50°F | 51 mm | 3 | 16° / 61°F |
| March | 50 | 15° / 59°F | 11° / 52°F | 60 mm | 5 | 15° / 59°F |
| April | 65 | 17° / 63°F | 13° / 55°F | 54 mm | 6 | 16° / 61°F |
| May | 83 | 19° / 66°F | 14° / 57°F | 31 mm | 8 | 16° / 61°F |
| June | 95 | 21° / 70°F | 16° / 61°F | 11 mm | 8 | 18° / 64°F |
| July | 96 | 22° / 72°F | 17° / 63°F | 3 mm | 9 | 19° / 66°F |
| August | 96 | 23° / 73°F | 18° / 64°F | 6 mm | 8 | 18° / 64°F |
| September | 92 | 22° / 72°F | 17° / 63°F | 25 mm | 6 | 16° / 61°F |
| October | 82 | 20° / 68°F | 16° / 61°F | 79 mm | 4 | 18° / 64°F |
| November | 60 | 17° / 63°F | 13° / 55°F | 92 mm | 2 | 18° / 64°F |
| December | 50 | 15° / 59°F | 11° / 52°F | 64 mm | 2 | 17° / 63°F |
Sea temperature in Cascais by month
The sea off Cascais is warmest in July at around 19°C / 66°F, and coolest in January at 15°C / 59°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
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Cascais: questions and answers
What kind of destination is Cascais?
Cascais is a seaside town in Portugal with a Mediterranean climate — the sea reaches 19°C at its warmest.
How many hours of sunshine does Cascais get a year?
Cascais gets about 2,985 hours of sunshine a year, at its best around July.
When is the best time to visit Cascais?
The sunniest time to visit Cascais is July, when the Sunshine Score peaks at 96/100 (with August and June close behind). Expect daytime highs around 22°C / 72°F.
What is the least sunny month in Cascais?
January is the least sunny month in Cascais, scoring 42/100 with about 65 mm of rain.
What is the sea temperature in Cascais?
The sea in Cascais ranges from about 15°C (January) to 19°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Cascais?
The typical midday UV index in Cascais peaks around 9 (very high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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