Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone.
New moon week (illumination under 15%) is the gold-standard window for serious stargazing — the Milky Way at peak contrast, faint DSO visible naked-eye in dark skies, and meteor showers at maximum count. Quarter phase washes faint deep-sky targets but is still great for planets, the moon itself, double stars and bright clusters. Full moon makes deep-sky observing essentially impossible; pivot to moon photography on those nights. A 0–100 score from a pure function with seven inputs: moon illumination, moon altitude (below horizon = ideal), cloud cover, Bortle dark-sky class, humidity (transparency proxy), wind (seeing proxy), temperature and next-hour rain. The score starts at 55 and adjusts up or down. Cloud cover and Bortle dominate: a Bortle 1 sky under a new moon and clear skies can push above 95; a Bortle 8 urban sky under a full moon will sit below 20 no matter what. A 9-point scale (1 = pristine wilderness, 9 = inner city) created by John Bortle in 2001 for measuring sky darkness. Bortle 1–2 reveals the full Milky Way structure with naked-eye DSO and zodiacal light. Bortle 4–5 is the typical European or US semi-rural sky. Bortle 7+ is urban — only the brightest 100 stars are visible. The Bortle of any location is mapped globally via the World Atlas of Artificial Night Sky Brightness. A sky you cannot see through is a sky you cannot stargaze. Above 50% cloud cover, deep-sky targets are routinely blocked even during the supposed clear gaps; above 80% the night is effectively a write-off. The Stargazing Score weights cloud cover as the heaviest single variable — a single 80% cloud reading takes –28 points off the score, more than any other input except moon illumination at full phase. Pick a Bortle 1–3 location in the destination column of the rankings above. Time the trip to a new-moon week (illumination under 15%) in the dry season. Allow at least 3 nights at the location — even desert sites have weather. Use the live conditions grid to monitor the spot 7 days out. Travel with wide-aperture lens (14–24 mm, f/2.8 or faster), sturdy tripod, intervalometer, and warm layers because you stop moving for 4+ hours. Depends on location and goal. Northern hemisphere Milky Way core is highest April–September. Southern hemisphere core is best March–October. Major meteor showers cluster in August (Perseids) and December (Geminids). Dry desert sites (Atacama, Namib, Sahara) deliver year-round; alpine sites (Mauna Kea, Pic du Midi) peak in summer; high-latitude sites (Jasper, Galloway) shine September–March when nights are long. Bortle 4 or darker for serious naked-eye Milky Way. Bortle 2 or darker for deep-sky imaging without narrowband filters. Bortle 6 or darker for telescope viewing of brighter DSO (M42, M13, M31). Bortle 7+ urban skies are still useful for planets, lunar and double stars — but accept that no equipment will resolve faint nebulae through that much light pollution. Rule of thumb: if your home is Bortle 6+, every 30 minutes of driving toward darker sky doubles the number of visible stars and triples the deep-sky targets reachable. The Plan-My-Stargazing wizard above lets you set difficulty budget and matches you to the best dark-sky site within reach. For one-off serious nights, drive. For casual evenings with kids, your back garden is fine. A 6–8" Dobsonian (e.g. Skywatcher 200P or Apertura AD8). Maximum aperture per dollar, simple push-to operation, no learning curve, holds value. Avoid department-store refractors at any price — they are toys. For pure portability and dark-sky tours, 10×50 binoculars + planisphere out-perform any beginner telescope under Bortle 3 skies. A surprising amount: Andromeda (M31), the Pleiades (M45), the Orion Nebula (M42), Jupiter's four Galilean moons, lunar craters, the Hyades, the double cluster, Comet Hale-Bopp-class comets, and the entire structure of the Milky Way. 10×50 binoculars are the most under-rated stargazing instrument in existence. Lunar craters along the terminator at 100–200×, Jupiter's cloud belts and Galilean moons at 150–250×, Saturn's rings at 200×, Mars surface markings (when in opposition), bright double stars (Albireo, Mizar), and the brightest open clusters (M45, M44). Skip nebulae and galaxies entirely until the moon sets. Eight common stargazing decisions, answered live against the conditions you set in the Decision Card above.
Scores are capped by dealbreakers — heavy rain, dangerous wind, thick fog or hazardous UV pull a day down no matter how pleasant the rest of the numbers look. Forecast data is Open-Meteo; solar and lunar values are computed for Star Gazing Decision Guide's own coordinates and time zone. Full details on the methodology page.