January in Cascais — the hardest end of the year
Hardest · 4.5/10January averages 11°C (52°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 9.4 hours of daylight.
It scores 4.5/10 here, 8th of 12 months, against 9.2/10 in the destination's best month.
Expect mid-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, May is materially better in Cascais — 4.7 points higher on the same scale.
February in Cascais — the hardest end of the year
Hardest · 4.5/10February averages 12°C (54°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 10.5 hours of daylight.
It scores 4.5/10 here, 9th of 12 months, against 9.2/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, May is materially better in Cascais — 4.7 points higher on the same scale.
March in Cascais — the hardest end of the year
Hardest · 4.5/10March averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 12 hours of daylight.
It scores 4.5/10 here, 10th of 12 months, against 9.2/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, May is materially better in Cascais — 4.7 points higher on the same scale.
April in Cascais — reliably good (6th best month)
Good · 8/10April averages 22°C (72°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 13.5 hours of daylight.
It scores 8/10 here, 6th of 12 months, against 9.2/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
May in Cascais — the year's strongest window
Best window · 9.2/10May averages 27°C (81°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 30 mm of rain — occasional showers rather than washed-out days — alongside about 23 sunny days and 14.6 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 9.2/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
June in Cascais — the year's strongest window
Best window · 9.2/10June averages 30°C (86°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 30 mm of rain — occasional showers rather than washed-out days — alongside about 23 sunny days and 15 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 9.2/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
July in Cascais — the year's strongest window
Best window · 9.2/10July averages 32°C (90°F) at 60% humidity — genuinely punishing heat. Anything outdoors needs to happen before 10am.
Expect 30 mm of rain — occasional showers rather than washed-out days — alongside about 23 sunny days and 14.6 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 9.2/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
August in Cascais — the year's strongest window
Best window · 9.2/10August averages 31°C (88°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 30 mm of rain — occasional showers rather than washed-out days — alongside about 23 sunny days and 13.5 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 9.2/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
September in Cascais — the year's strongest window
Best window · 9.2/10September averages 26°C (79°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 30 mm of rain — occasional showers rather than washed-out days — alongside about 23 sunny days and 12 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 9.2/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
October in Cascais — reliably good (7th best month)
Good · 8/10October averages 21°C (70°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 10.5 hours of daylight.
It scores 8/10 here, 7th of 12 months, against 9.2/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
November in Cascais — the hardest end of the year
Hardest · 4.5/10November averages 17°C (63°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 9.4 hours of daylight.
It scores 4.5/10 here, 11th of 12 months, against 9.2/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, May is materially better in Cascais — 4.7 points higher on the same scale.
December in Cascais — the hardest end of the year
Hardest · 4.5/10December averages 13°C (55°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 20 sunny days and 9 hours of daylight.
It scores 4.5/10 here, 12th of 12 months, against 9.2/10 in the destination's best month.
Expect mid-season pricing, and crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, May is materially better in Cascais — 4.7 points higher on the same scale.
