Siero Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Siero.
Climate overview of Siero
Temperatures in Siero, Asturias, Spain, vary greatly throughout the year. August is the hottest month at 23°C (73°F), while January is the coldest at 12°C (54°F).
The city receives considerable rainfall, with around 1345 mm (53 in) annually. November is the wettest month. It has warm summers and mild winters. July is the sunniest month, averaging 5.9 hours of sunshine per day.
Siero Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Siero - and find the best time to visit.
Monthly Temperature in Siero
The climate in Siero is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 23°C (73°F) in August to a moderate 12°C (54°F) in the coolest month, January.
Nights vary from 15°C (59°F) in August to around 5°C (41°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Siero
Siero has a notably wet climate with abundant precipitation, recording 1345 mm (53 in) of rainfall per year. Siero offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month November (144 mm (5.7 in)) and the driest month July (83 mm (3.3 in)) is not too significant. For more details, please visit our Siero 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 Siero
For those who appreciate different seasons, Siero serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 5.9 hours of sunshine daily, and embrace the darker days in December, offering only 3.5 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Siero by Month
The relative humidity is high throughout the year in Siero.
The city experiences its highest humidity in August, reaching 80%. In March, the humidity drops to its lowest level at 74%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Siero
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July, August and September
- Warmest weather: July and August
- Most sunshine: July and August
- Fewest rainy days: June, July, August and September
- Seasonal pattern: Warm summers and mild winters
Frequently asked questions about the climate in Siero
What is the best time to visit Siero?
July, August and September typically offer the most optimal weather in Siero. In contrast, January, February and December tend to have less optimal conditions. Siero has warm summers and mild winters.
What temperatures can I expect in Siero?
Daytime highs range from 12°C (54°F) in January to 23°C (73°F) in August. Nighttime lows range from 5°C (41°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Siero get?
Annual rainfall is around 1345 mm (53 in). November is the wettest month with 144 mm (5.7 in), while July is the driest with 83 mm (3.3 in).
How sunny is Siero?
Siero receives around 1,762 hours of sunshine per year. July is the sunniest month with 178 hours, while December is the cloudiest with just 105 hours.
Siero 3-Day Forecast
Siero 3-Day Forecast
Siero on the map
Siero is highlighted - select any city to see its climate.
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