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Cascais in May: weather, sea & travel advice
This month's data profile
Strong month under the current formula
Cascais in May is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 19 °C, and the sea is about 16 °C. With about 7 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
69/100 · #5
Warmth
#6
Dryness
#5
Sun
#3
Sea warmth
#7
Published best categories: Active
Cascais · MayPhoto: Terry Kearney from liverpool, merseyside · CC0Climate facts
- Average high
- 19 °C
- Average low
- 15 °C
- Sea
- 16 °C
- Rainy days (est.)
- 7 rainy days (est.)
- Sun (est.)
- 9 h/day
- Humidity
- 79 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| April | 17 | 13 | 9 | 52 | 7.3 | 79 | 4.7 | 16 | 58 |
| May (selected) | 19 | 15 | 7 | 37 | 8.6 | 79 | 4.6 | 16 | 69 |
| June | 21 | 17 | 3 | 10 | 9.0 | 80 | 4.6 | 18 | 79 |
How do the previous and next months compare?
Baseline: May (69/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| April | -11 | -1.9 °C | -1.6 °C | +2.6 | +15.1 mm | -1.3 h | +0.1 % | +0.1 m/s | -0.9 °C |
| June | +10 | +2.1 °C | +1.9 °C | -3.9 | -26.9 mm | +0.4 h | +0.7 % | ±0 m/s | +1.3 °C |
All twelve months in context
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Frequently asked questions
How warm is Cascais in May?
The average daily high is around 19 °C, with an average daily low of about 15 °C.
Can you swim in Cascais in May?
The sea is about 16 °C (cold).
Does it rain a lot in Cascais in May?
The curated estimate is about 7 rainy days per month, not a directly measured long-term average. Total precipitation averages around 37 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Cascais?
By the climate score, June, July, August and September are the strongest months for Cascais. For a beach trip: June, July, August and September. May is not among them.