Weather in Cascais

Planning your visit to Cascais? Here you will find the latest information on weather conditions, as well as current forecasts and useful charts to help you plan your day.

Cascais, located in Portugal, boasts a pleasant Mediterranean climate. This means the city offers its guests mild winters and warm, sunny summers. Temperature fluctuations throughout the year are moderate, making Cascais an attractive destination to visit at practically any time of year.

In Cascais, the seasons are clearly defined. Summer, especially from June to August, is characterised by warm and very dry weather. Average temperatures during this period hover around 18-20°C, and precipitation is practically non-existent in July and August. Winter (December-February) is mild here, with average temperatures around 12-14°C. Although more days with precipitation are recorded in the winter months, as well as late autumn and early spring (for example, in November, March, and April), the total amount remains quite insignificant, indicating mostly light rains.

One of the notable features of the climate in Cascais is the very low rainfall year-round, with particularly arid summer months. Even during the "wettest" periods, rainfall amounts are minimal. This ensures a large number of sunny days, ideal for relaxing and exploring this charming Portuguese town and its surroundings.

The climate in Cascais is characterised by mild temperatures throughout the year, without sharp fluctuations. The hottest months are traditionally July and August, when the average temperature holds at 20.1°C - 20.2°C, and maximum daytime values reach a comfortable 22.6°C. The summer months, including June, offer pleasant warmth, perfect for a seaside holiday without exhausting heat. Minimum night-time temperatures in summer drop to 16-18°C, providing freshness.

The winter period in Cascais is distinguished by its mildness. The coolest months are considered January and December, with average temperatures of about 12.5°C and 13.8°C respectively. Minimum temperatures in these months rarely drop below 10.7°C - 12.1°C, and maximum daytime readings usually fluctuate around 14.4°C - 15.5°C. This means that even in winter, the weather remains relatively warm, without frost. The transitional seasons – spring and autumn – are also comfortable, with a gradual rise in temperature in spring and a smooth decline in autumn.

Diurnal temperature fluctuations in Cascais are small. The difference between average maximum and minimum temperatures during the month is usually about 3-5°C. This indicates a stable and moderate climate where there are no sharp temperature jumps between day and night, making a stay in the city comfortable at any time of day.

In Cascais, as in many regions of Portugal with Mediterranean influence, there is a clear division of the year into wet and dry seasons. Precipitation here falls mainly in the form of rain, and its intensity and frequency vary noticeably from month to month, while snowfall is uncharacteristic for this coastal city.

The driest period in Cascais falls on the summer months. July and August stand out as absolutely dry, when no precipitation is observed at all (0 mm), and the number of rainy days is zero. June is also very dry, with zero rainfall, although up to 4 days are recorded when precipitation is possible. May and September are transitional months with minimal rainfall (about 1 mm) and approximately 4 rainy days.

The wet season covers the autumn-winter period and part of spring. The highest number of days with precipitation occurs in March, April, November, and December – averaging 10 days in each of these months. In January there are about 8 rainy days, in February – 7, and in October – 9. Despite relatively frequent occurrences, the total amount of precipitation in these months remains small, usually about 2 mm per month. This suggests that rains, as a rule, are light or moderate in nature.

When planning a trip to Cascais, it is important to consider its pleasant coastal climate, which can nevertheless be changeable, especially due to the influence of the Atlantic Ocean. The key to a comfortable holiday will be layering your clothes. Even on the warmest days, the evening breeze can bring coolness, so a light jacket or sweater will be very handy at practically any time of year. Don't forget comfortable walking shoes – Cascais and its picturesque surroundings are perfect for long walks along the coast and through charming old streets.

In the summer months, from June to September, when the average temperature ranges from 18-20°C and precipitation is virtually absent (especially in July and August), your wardrobe should consist of light, breathable clothing: T-shirts, shorts, sundresses, and, of course, swimwear. Be sure to take sunscreen, a hat, and sunglasses to protect against the bright Portuguese sun. In the cooler time of year, covering the period from October to April, average temperatures vary from 12°C to 18°C. During these months (especially from November to March, as well as in October and April, when the number of rainy days increases), it is worth adding warmer items to your suitcase: jeans, sweaters, a fleece jacket, and a waterproof jacket or a compact umbrella. Although there is no severe cold in Cascais, an extra layer of clothing will ensure comfort during evening walks or in windy weather.