Alqueva stargazing forecast — Saturday, August 15

Alentejo, Portugal · Bortle 2 · 38.200, -7.500 · Snapshot generated Sat, 15 Aug 2026 02:05:09 GMT

Excellent (High confidence)

10h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 0%.

Best observing window tonight

Sat 10:00 p.m. – Sun 7:00 a.m. (10h, 0% mean cloud)

Astronomical night: Sat 9:24 p.m. → Sun 7:45 a.m.
Moon: Waxing crescent · 7% illuminated
Mean cloud (during night): 0% (min 0%)

Site

The Alqueva reservoir in Portugal's Alentejo was the world's first Starlight Tourism Destination. Warm, dry summer nights and a huge water horizon make it the most accessible dark-sky area in Iberia.

Drive from Toronto: ≈ 2 h from Lisbon or 2.5 h from Seville via the A6/IP2.

Best time of year: April–October for warm nights; the Alentejo's clear-sky frequency in summer is among the highest in Europe.

Open the live 48-hour forecast →

Citations & data sources

Open-Meteo Forecast API (cloud, humidity, wind, visibility)
Open-Meteo astronomical data (sunrise, sunset, moon)
Bortle scale reference for site darkness
Editorial guide for Alqueva: /sites/alqueva-starlight.txt
Structured site data: /sites/alqueva-starlight.json
Live MCP server (AI agents): https://koohxdehsweadgdegrly.supabase.co/functions/v1/mcp

This is a build-time snapshot — the live forecast at https://ontarionightsky.com/?site=alqueva-starlight updates continuously.