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Bioestrecho

Tuesday, 8 September 2026

The Strait now

What can be said about the Strait today: the wind forecast for Tarifa and how it decides the crossing, the groups on passage according to the calendar, and which species are due this week from each site.

Natural Earth cartography, public domain

Where to watch today

Forecast wind at Tarifa, 10:00–16:00

7km/h from the SW

Gusts

20 km/h

NESW

Calm: crossing along the whole front

With no dominant wind, soaring birds cross at any point between Tarifa and Gibraltar as soon as the thermals rise. It is the most spread-out day and the most comfortable for watching.

Watchpoint: Any; Cazalla and Algarrobo cover both ends

Forecast for Tuesday 8 September, Open-Meteo (CC BY 4.0). A reading, not a prediction of passage.

Seasonality

September is the peak of soaring birds heading south.

Photo: European Honey Buzzard, Alidz31, CC BY · Barn Swallow, Donald Davesne, CC BY · Northern Gannet, Brooke J., CC BY

Deduced from the migration calendar, not from today's observations.

Recent observations

Observations from the last few days will come from eBird and iNaturalist once their terms of use are settled.

Until then this block will show no sightings: presenting a historical record as recent would be the easiest mistake to make and the hardest to detect.

Latest data added: 8 September 2026

What to see this week, site by site

At each site, the species with the largest share of their open records in these weeks of the year (week 37 and its two neighbours). A probability, not a promise.

Each species' line is its weekly distribution here; the vertical tick is the current week.

Everything that crosses has its hour

The Strait is not a place of constant passage but a calendar. Each group has its window, and in September the ones marked below coincide.

  • Representative species: European Honey BuzzardSoaring birds heading south: from July to October, peak in September; on passage now
  • Representative species: Black KiteSoaring birds heading north: from February to May, peak in March
  • Representative species: Barn SwallowPost-breeding passerines: from August to November, peak in October; on passage now
  • Representative species: Northern GannetSeabirds on passage: from September to April, peak in November; on passage now
peak passagepassage windowtodayPhoto: European Honey Buzzard, Alidz31, CC BY · Black Kite, Valentina Eggler, CC0 · Barn Swallow, Donald Davesne, CC BY · Northern Gannet, Brooke J., CC BY

Bibliographic source, pending comparison with Fundación Migres

See the routes