Oeiras Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Oeiras.
Climate overview of Oeiras
Oeiras, Lisbon Region, Portugal, experiences moderate temperature changes through the seasons. August is the warmest month with daytime highs of 24°C (75°F), while January is the coolest at 15°C (59°F).
The city receives around 609 mm (24 in) of rainfall per year. It experiences a distinct dry season from June to September. November is the wettest month and July the driest. The sunniest month is July, with 12.8 hours of sunshine per day on average.
Oeiras Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Oeiras - and find the best time to visit.
Monthly Temperature in Oeiras
The weather in Oeiras changes moderately throughout the year, offering enough variation to appreciate each season. On average, daytime temperatures range from a comfortable 24°C (75°F) in August to a moderate 15°C (59°F) in January.
Nighttime temperatures range from 18°C (64°F) in August to 11°C (52°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Oeiras
Generally, Oeiras has a moderate amount of precipitation, averaging 609 mm (24 in) of rainfall annually. The seasons in Oeiras bring significant changes in precipitation. The wettest month, November, receives moderate rainfall, with an average of 91 mm (3.6 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 3.3 mm (0.1 in) over 2 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Oeiras Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Oeiras
In Oeiras, summer days are longer and more sunny, with daily sunshine hours peaking at 12.8 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.4 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Oeiras by Month
The relative humidity is high throughout the year in Oeiras.
The city experiences its highest humidity in January, reaching 82%. In July, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Oeiras
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August, September and October
- Warmest weather: July, August and September
- Most sunshine: July
- Fewest rainy days: July and August
- Seasonal pattern: A distinct dry season from June to September
Frequently asked questions about the climate in Oeiras
What is the best time to visit Oeiras?
May, June, July, August, September and October typically offer the most optimal weather in Oeiras. In contrast, January, February, March and December tend to have less optimal conditions. Oeiras has a distinct dry season from June to September.
What temperatures can I expect in Oeiras?
Daytime highs range from 15°C (59°F) in January to 24°C (75°F) in August. Nighttime lows range from 11°C (52°F) to 18°C (64°F).
How much rain does Oeiras get?
Annual rainfall is around 609 mm (24 in). November is the wettest month with 91 mm (3.6 in), while July is the driest with 3.3 mm (0.1 in).
How sunny is Oeiras?
Oeiras receives around 3,091 hours of sunshine per year. July is the sunniest month with 385 hours, while December is the cloudiest with just 162 hours. Overall, Oeiras enjoys abundant sunshine.
Oeiras 3-Day Forecast
Oeiras on the map
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