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Weather in Cascais for May 2026

Your guide to Cascais weather in May - trends and predictions

    Temperatures

  • The forecast for the next days in Cascais predicts temperatures to be around 17 °C, close to the historical average.

  • In general, the average temperature in Cascais at the beginning of May is 17.7 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 20.3 °C by the end of May.

    • Rain 🌧️

  • With an average of 5 rainy days, Cascais experiences minimal rainfall in May.

    • More

  • Is May a good time to visit Cascais? check out the best time to travel to Cascais page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
26
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/15°
Temperatures
Average wind speed
27 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Cascais Weather May

Move between months or click on a day
April
June
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
19°
2
Overcast
18°
3
Patchy rain possible
17°
4
Patchy rain possible
18°
5
Cloudy
18°
6
Patchy rain possible
18°
7
Partly cloudy
16°
8
Moderate rain
17°
9
Moderate rain
17°
10
Patchy rain possible
17°
11
Patchy rain possible
17°
12
Patchy rain possible
18°
13
Patchy rain possible
18°
14
Partly cloudy
16°
15
Sunny
16°
16
Sunny
18°
17
Sunny
19°
18
Patchy rain possible
19°
19
Sunny
18°
20
Patchy rain possible
18°
21
Moderate rain at times
19°
22
Moderate rain at times
19°
23
Moderate rain at times
20°
24
Sunny
20°
25
Sunny
20°
26
Sunny
19°
27
Sunny
19°
28
Sunny
20°
29
Sunny
21°
30
Sunny
21°
31
Sunny
22°

Temperatures trend during May in Cascais

See the weather trend as well as the moving average line

May weather in Cascais day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Patchy rain possible
Patchy rain possible
 19° /12° 0.7 mm 6
2 May Overcast
Overcast
 18° /14° 5.5 mm 5
3 May Patchy rain possible
Patchy rain possible
 17° /14° 2.9 mm 5
4 May Patchy rain possible
Patchy rain possible
 18° /14° 1.9 mm 5
5 May Cloudy
Cloudy
 18° /14° 0.9 mm 6
6 May Patchy rain possible
Patchy rain possible
 18° /13° 0.2 mm 5
7 May Partly cloudy
Partly cloudy
 16° /14° 0 mm 6
8 May Moderate rain
Moderate rain
 17° /14° 10.3 mm 6.2
9 May Moderate rain
Moderate rain
 17° /15° 7 mm 4
10 May Patchy rain possible
Patchy rain possible
 17° /15° 4.6 mm 4
11 May Patchy rain possible
Patchy rain possible
 17° /15° 2.8 mm 4
12 May Patchy rain possible
Patchy rain possible
 18° /15° 0.5 mm 4
13 May Patchy rain possible
Patchy rain possible
 18° /14° 0.3 mm 4
14 May Partly cloudy
Partly cloudy
 16° /14° 0.1 mm 4
15 May Sunny
Sunny
 16° /14° 0 mm 4
16 May Sunny
Sunny
 18° /14° 0 mm 5
17 May Sunny
Sunny
 19° /16° 0 mm 5
18 May Patchy rain possible
Patchy rain possible
 19° /14° 0.6 mm 4
19 May Sunny
Sunny
 18° /16° 0.1 mm 5
20 May Patchy rain possible
Patchy rain possible
 18° /15° 1.7 mm 4
21 May Moderate rain at times
Moderate rain at times
 19° /15° 0.4 mm 5
22 May Moderate rain at times
Moderate rain at times
 19° /15° 0.7 mm 4
23 May Moderate rain at times
Moderate rain at times
 20° /15° 0.3 mm 5
24 May Sunny
Sunny
 20° /15° 0.5 mm 5
25 May Sunny
Sunny
 20° /14° 0 mm 5
26 May Sunny
Sunny
 19° /15° 0 mm 5
27 May Sunny
Sunny
 19° /15° 0.1 mm 5
28 May Sunny
Sunny
 20° /15° 0 mm 5
29 May Sunny
Sunny
 21° /15° 0 mm 6
30 May Sunny
Sunny
 21° /16° 0 mm 5
31 May Sunny
Sunny
 22° /15° 0 mm 6
Next
Important Notice
Our weather forecast for Cascais in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cascais forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Cascais weather in May vs April vs June

Compare May weather in Cascais with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AprilMayJune
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Sunny
Sunny
Temperatures18°/13°19°/15°21°/17°
Rainfall48 mm17 mm15 mm
Wind26.7 km/h27.1 km/h27.5 km/h
Humidity74%74%78%
Rainy days13 days5 days6 days
Dry days17 days26 days24 days

Planning a trip to Cascais? Discover the best time to visit

Cascais in May - FAQ

What are the expected maximum and minimum temperatures in Cascais during May?

During May, expect a variety of temperatures with highs around 19° and lows near 15°, suitable for diverse activities and preferences.

How much rainfall should be expected in Cascais during May?

Expect minimal rainfall in Cascais during May, with a total of 17.3 mm over approximately 5 days. This minimal precipitation is unlikely to significantly impact plans.

What are the typical wind conditions in Cascais during May?

The average wind speed in Cascais during May is 27 km/h, suggesting breezy to windy conditions, depending on your activities.

Cascais water temperatures in May

The average water temperature of the Atlantic Ocean near Cascais in May is 13.8 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Cascais in May?
The average water temperature in Cascais in May is 13.8 °C.
Can you swim in Cascais in May?
Cold enough that you lose heat fast. A full 4–5 mm wetsuit (plus hood/gloves for comfort) is advisable for anything beyond a brief plunge.

What to pack to Cascais in May?

As you prepare for your trip to Cascais in May, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Cascais, during May, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants

May rainfall patterns in Cascais

Explore the daily rainfall trends and prepare for Cascaiss May weather 💧
Typically, Cascais has 5 rainy days in May with a total of 17.3 mm of rainfall.

UV exposure in Cascais during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

Quick links

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Location coordinates Where is Cascais?

Get accurate weather forecasts for Cascais, located at latitude 38.697 and longitude -9.421. Stay updated with localized weather information tailored for Cascais.

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