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Sines Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sines.
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Climate overview of Sines
The climate in Sines, Alentejo, Portugal, sees a moderate range of temperatures across the year, from 25°C (77°F) in August down to 16°C (61°F) in January.
Sines sees a moderate amount of rainfall, totalling around 580 mm (23 in) per year. It experiences a distinct dry season from May to September, creating some seasonal variation.
Sines Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sines - and find the best time to visit.
Monthly Temperature in Sines
The climate in Sines experiences moderate temperature changes, with mild shifts between seasons. Average maximum daytime temperatures range from a comfortable 25°C (77°F) in August, the warmest time of the year, to a moderate 16°C (61°F) during cooler months like January.
At night, you can expect temperatures ranging from 18°C (64°F) in August to around 10°C (50°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sines
On average, Sines receives a reasonable amount of rainfall, with an annual precipitation of 580 mm (23 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives moderate rainfall, averaging 85 mm (3.3 in) of precipitation, recorded across 13 rainy days. In contrast, the driest month July brings less rainfall, with 2.5 mm (0.1 in) over a single rainy day. For more details, please visit our Sines Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Sines
The most comfortable overall weather for exploring Sines is usually found in May, June, July, August, September and October. Conditions are generally least comfortable in January, February and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
good
Feb
good
Mar
very good
Apr
very good
May
excellent
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
excellent
Nov
very good
Dec
good
- Best overall: May, June, July, August, September and October
- Warmest weather: July, August and September
- Fewest rainy days: July and August
- Seasonal pattern: A distinct dry season from May to September
Frequently asked questions about the climate in Sines
What is the best time to visit Sines?
May, June, July, August, September and October typically offer the most optimal weather in Sines. In contrast, January, February and December tend to have less optimal conditions. Sines has a distinct dry season from May to September.
What temperatures can I expect in Sines?
Daytime highs range from 16°C (61°F) in January to 25°C (77°F) in August. Nighttime lows range from 10°C (50°F) to 18°C (64°F).
How much rain does Sines get?
Annual rainfall is around 580 mm (23 in). December is the wettest month with 85 mm (3.3 in), while July is the driest with 2.5 mm (0.1 in).
Sines 3-Day Forecast
Sines on the map
Sines is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
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