Climate Overview
The climate in Alcácer do Sal is temperate. The average annual temperature is 17°C and approximately 463mm of precipitation falls per year. March is the wettest month, receiving around 78mm of rainfall. Alcácer do Sal is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 7°C.
Temperature
Temperatures in Alcácer do Sal vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 32°C and the mean temperature sits around 24°C. January is the coolest month, with minimum temperatures around 7°C and an average of 10°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.
Precipitation
Alcácer do Sal is a relatively dry area, receiving approximately 463mm of precipitation annually, which averages out to around 39mm per month. The wettest month is March, averaging 78mm of rainfall. April and November also tend to see above-average precipitation. The driest month is August, with just 2mm. That's 76mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Alcácer do Sal is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
91 days until Autumn
It is currently summer in Alcácer do Sal, which began on June 21, 2026. Alcácer do Sal is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 32°C, while the coldest stretch bottoms out in January near 7°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.
Spring
Temperatures range from 8 to 25°C. Precipitation is moderate at around 199mm for the season, averaging 66mm per month. Winds are generally light, averaging 3km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 15 to 32°C. Precipitation is minimal, with only around 13mm for the entire season. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 10 to 30°C. Rainfall is relatively light, with around 120mm over the season and a monthly average of 40mm. Winds are generally light, averaging 3km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 7 to 17°C. Rainfall is relatively light, with around 131mm over the season and a monthly average of 44mm. Winds are generally light, averaging 3km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Alcácer do Sal is during April, May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 27mm per month. By contrast, January can be quite cold with temperatures dropping to 7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Alcácer do Sal based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
