The month in detail
What to expect in September
Autumn in Formentera is often underrated: 77°F, golden light and declining crowds. An interesting window. Rain risk remains low (15% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if July (9.4/10) remains theoretically better.
September ranks 4 out of 12 months in Formentera. Compared to August: −4°F daytime, 10 pts more rainy days, −1.4h of sun per day.
This month's conditions
What it's like in September
UV index
6 · high
sunscreen and hat advised
Feels like
muggy at times
19°
Sea
27°C
warm, ideal
Daylight
12.2h of daylight
Air quality
good
AQI 36
Compare
Is September the right month?
The best month in Formentera is July (9.4/10), 1.0 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Formentera
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Formentera
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach trip.
Country · Spain
🗣️LanguageSpanish
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthAugust · 81°F
❄️Coolest monthJanuary · 59°F
🌧️Rainiest month ⓘNovember · 20%
🏖️ Beach trip
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
🛂VisaSchengen · 90 days
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Formentera ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
SpainTemperate oceanic climate with a 9.4 → 4.5 gap between best and worst month. 10 years of ERA5 data to choose by project.
38.70°N · 1.44°E
Questions
Frequently asked questions
What is the best time to visit Formentera?
July is the best month with 79°F highs, 75°F lows, 9.8h of sunshine and 1.0% rainy days. The months of July & August offer comparable conditions.
How many hours of sunshine does Formentera get in July?
Formentera averages 9.8 sunshine hours per day in July. It is the sunniest month with a climate score of 9.1/10.
What is the rainiest month in Formentera?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Formentera in July?
In July, overnight lows reach 75°F, while afternoon highs average 79°F.
Is Formentera good in winter?
In winter (December-February), Formentera scores 6.1/10 on average — Acceptable conditions for cultural visits.. The best month overall remains July with a score of 9.1/10.
When should you avoid Formentera?
January is the most difficult month to visit Formentera, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Formentera in September?
In September, the sea averages 80°F in Formentera: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Formentera in September?
The average UV index reaches 6 in September in Formentera (high), with about 12.2h of daylight. Sunscreen and hat advised.