Parque Natural do Vale do Guadiana

Sky Score 52/100≈ Bortle 3

8 places to stay nearby, rated for darkness ↓

Parque Natural do Vale do Guadiana is a protected area in Alentejo with a measured darkness of 79/100 (≈ Bortle 3), a genuinely dark sky where the Milky Way is a bright, structured band. The best month to come is typically July, when about 83% of the night sky is clear.

Tonight's outlook: 31/100. The moon is 88% lit and above the horizon 88% of the night; typical September clear-sky odds here are 67%. Updated daily.

Best time to stargaze at Parque Natural do Vale do Guadiana

MonthClear night skiesSky Score (new moon)
January48%46/100
February48%46/100
March47%46/100
April44%44/100
May58%52/100
June69%59/100
July ★83%68/100
August82%68/100
September67%58/100
October50%47/100
November48%46/100
December44%44/100

Scores assume a moonless night, check the moon before you drive (methodology).

Where to stay near Parque Natural do Vale do Guadiana: sleep under a dark sky

We measured the night sky over each stay below, not just over the spot: the darkness score is computed at the hotel's own location, so you know what you'll see from the door. Sorted darkest sky first, with the distance to Parque Natural do Vale do Guadiana for each.

72/100sky darkness at this stay

#1Darkest sky of these stays

Monte de Santo António

Sky darkness
72/100
To the spot
3.8 km
Location
Mértola
Check availability →

67/100sky darkness at this stay

#2

Mértola Castelo Palace

Sky darkness
67/100
To the spot
5.7 km
Location
Mértola
Check availability →

60/100sky darkness at this stay

#3

Flor do Guadiana

Sky darkness
60/100
To the spot
4.8 km
Location
Mértola
Check availability →

More stays nearby

Booking links are affiliate links, see the disclosure.

Live prices around Mértola

Mértola is the closest base to Parque Natural do Vale do Guadiana with rooms to book. The map shows everything available there right now, including the hotels, apartments and cabins we do not rate. Use the stays above when darkness decides, use the map when price or availability does.

Prices and availability come from the booking partners shown on the map, and we earn a commission on bookings made through it. Sky darkness is measured only for the stays listed above.

Nearby spots in Alentejo

Sky data: NASA Black Marble VJ146A4 2025 annual composite · clear-sky climatology ERA5 2015–2024 (methodology).