January in Cascais — off-season conditions
Hardest · 2.6/10January averages 14°C (56°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 57 mm, so plan one flexible day in three; you still get about 1 days with 6+ hours of sunshine and 9.6 hours of daylight.
It scores 2.6/10 here, 11th of 12 months, against 8.5/10 in the destination's best month.
Figure on mid-season pricing, with crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? August scores 5.9 points higher here — enough to change the trip.
February in Cascais — off-season conditions
Hardest · 3.5/10February averages 14°C (57°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 54 mm, so plan one flexible day in three; you still get about 7 days with 6+ hours of sunshine and 10.5 hours of daylight.
It scores 3.5/10 here, 9th of 12 months, against 8.5/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? August scores 5 points higher here — enough to change the trip.
March in Cascais — the hardest end of the year
Hardest · 4.3/10Temperatures hover around 14°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 76 mm of rain this month — a flexible day or two helps — with about 15 days with 6+ hours of sunshine and 11.7 hours of daylight to work around it.
That is 4.3/10 on the same scale — 8th of 12 months, versus 8.5/10 for the best month here.
Expect mid-season pricing, and crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, August is materially better in Cascais — 4.2 points higher on the same scale.
April in Cascais — middling scores, decent value
Trade-offs · 6.3/10April 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 47 mm, so plan one flexible day in three; you still get about 27 days with 6+ hours of sunshine and 13 hours of daylight.
It scores 6.3/10 here, 6th of 12 months, against 8.5/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? August scores 2.2 points higher here — enough to change the trip.
May in Cascais: strong conditions, 5th of 12
Good · 7.3/10Temperatures hover around 17°C (63°F) — the kind of month where neither heat nor cold forces the schedule.
At just 14 mm for the month, rain will not shape your plans; you get about 31 days with 6+ hours of sunshine and 14.1 hours of daylight.
That is 7.3/10 on the same scale — 5th of 12 months, versus 8.5/10 for the best month here.
Budget for mid-season pricing, and crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening.
June in Cascais — reliably good (4th best month)
Good · 8/10June averages 19°C (66°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 14 mm for the month, with about 30 days with 6+ hours of sunshine and 14.7 hours of daylight to work with.
It scores 8/10 here, 4th of 12 months, against 8.5/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack light clothing, swimwear and real sun protection.
July holds up well in Cascais — 2nd best month
Good · 8.4/10July averages 20°C (68°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 2 mm for the month, with about 31 days with 6+ hours of sunshine and 14.5 hours of daylight to work with.
It scores 8.4/10 here, 2nd of 12 months, against 8.5/10 in the destination's best month.
Figure on peak pricing, with 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 light clothing, swimwear and real sun protection.
August in Cascais tops the year's climate scores
Best window · 8.5/10With 20°C (69°F) on average, August delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
At just 2 mm for the month, rain will not shape your plans; you get about 31 days with 6+ hours of sunshine and 13.5 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Cascais at 8.5/10 — the reference point every other month on this page is measured against.
Budget for 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 light clothing, swimwear and real sun protection.
September in Cascais — reliably good (3rd best month)
Good · 8.2/10With 20°C (68°F) on average, September delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
With around 34 mm of rain, any showers tend to pass through rather than settle in; about 23 days with 6+ hours of sunshine and 12.2 hours of daylight fill the rest.
That is 8.2/10 on the same scale — 3rd of 12 months, versus 8.5/10 for the best month here.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack light clothing, swimwear and real sun protection.
October in Cascais — middling scores, decent value
Trade-offs · 5.5/10October averages 19°C (67°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 70 mm, so plan one flexible day in three; you still get about 10 days with 6+ hours of sunshine and 11 hours of daylight.
It scores 5.5/10 here, 7th of 12 months, against 8.5/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Flexible dates? August scores 3 points higher here — enough to change the trip.
November in Cascais — off-season conditions
Hardest · 3.4/10November averages 17°C (62°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 65 mm, so plan one flexible day in three; you still get about 3 days with 6+ hours of sunshine and 9.8 hours of daylight.
It scores 3.4/10 here, 10th of 12 months, against 8.5/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? August scores 5.1 points higher here — enough to change the trip.
December in Cascais: expect compromises
Hardest · 1.8/10Temperatures hover around 15°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 90 mm of rain this month — a flexible day or two helps — with almost no days with 6+ hours of sunshine and 9.3 hours of daylight to work around it.
That is 1.8/10 on the same scale — 12th of 12 months, versus 8.5/10 for the best month here.
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, August is materially better in Cascais — 6.7 points higher on the same scale.
