May · Portugal
Best time to visit Cascais in May Weather, crowds & prices
Weather in Cascais in May
Average temperature 17°C, 14 mm of rain, about 31 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
7.3/10
Ranked #5 of 12 months
- Avg temp
- 17°C
- Rainfall
- 14 mm
- Humidity
- 79%
- Days with 6h+ sun
- 31
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Cascais scores 7.3/10 for beach and coastal travel - an above-average month (#5 of 12). Expect around 17°C, 14 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Cascais pairs a walkable former fishing town with sheltered beaches, an Atlantic promenade, and the wilder coast toward Guincho.
May in Cascais: strong conditions, 5th of 12
Temperatures 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.
Pack layers you can shed by midday plus one warm layer for the evening.
Budget for mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Cascais in May?
- In May, Cascais averages 17°C, 14 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 7.3/10.
- Is May a good time to visit Cascais?
- May earns a 7.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cascais in May?
- Expect about 14 mm of rain in May. Average humidity is 79% and there are about 31 days with 6+ hours of sunshine.
Curated in Cascais
Tickets & experiences
Things to do in Cascais
Cascais, Portugal. Live activities and tours from GetYourGuide, matched to this destination.