Stargazing at Sutjeska National Park: when is the sky clear and dark?
August is the best month for stargazing at Sutjeska National Park: on average 60 clear, moonless hours of full darkness, and 42% of nights have at least two of them (ERA5, 2006–2025). The darkest spot we found there is darker than 81% of Europe’s land (NASA VIIRS 2025).
national park · Bosnia and Herzegovina
Month by month
| Month | Nights with ≥ 2 such hours | Clear moonless dark hours | Moonless dark hours | Of them clear |
|---|---|---|---|---|
| January | 14% | 25 | 172 | 14% |
| February | 17% | 27 | 148 | 18% |
| March | 18% | 31 | 138 | 23% |
| April | 22% | 28 | 106 | 26% |
| May | 19% | 22 | 82 | 27% |
| June | 24% | 25 | 61 | 41% |
| July | 38% | 45 | 75 | 59% |
| August | 42% | 60 | 104 | 58% |
| September | 29% | 43 | 126 | 34% |
| October | 26% | 44 | 157 | 28% |
| November | 23% | 38 | 168 | 22% |
| December | 23% | 38 | 187 | 20% |
Climate, not a forecast: these are shares of past nights (ERA5 reanalysis, 2006–2025), not a prediction for a particular night. Check a forecast before you go.
Light pollution
| Darker than | 81% of Europe’s land |
|---|---|
| Light pollution | very dark (darkest 5–20 %) |
| Sky-glow index (own, VIIRS) — Darkest spot we found | 0.59 |
| Sky-glow index (own, VIIRS) — at the official map point | 1.82 |
| Sky-glow index (own, VIIRS) — median across the area | 0.68 |
| Darkest spot we found | 43.275, 18.725 (map) — within the OSM boundary |
Next new moons
| New moon | Night | Moonless dark hours that night | Typical share of good nights that month |
|---|---|---|---|
| 9 November 2026 | 8–9 November 2026 | 10.8 | 23% |
| 9 December 2026 | 8–9 December 2026 | 11.5 | 23% |
| 7 January 2027 | 7–8 January 2027 | 11.5 | 14% |
| 6 February 2027 | 6–7 February 2027 | 10.5 | 17% |
| 8 March 2027 | 7–8 March 2027 | 9.3 | 18% |
| 6 April 2027 | 6–7 April 2027 | 7.7 | 22% |
| 6 May 2027 | 6–7 May 2027 | 5.8 | 19% |
| 4 June 2027 | 4–5 June 2027 | 4.3 | 24% |
| 4 July 2027 | 3–4 July 2027 | 4.2 | 38% |
| 2 August 2027 | 1–2 August 2027 | 5.5 | 42% |
| 31 August 2027 | 31 August 2027 – 1 September 2027 | 7.3 | 42% |
| 30 September 2027 | 29–30 September 2027 | 9.0 | 29% |
Hours with the Sun below −18° and the Moon below the horizon, on the night of the new moon, at the darkest spot.
Meteor showers
| Shower | Peak night | Chance of a clear peak night | Moon lit | Moonless dark hours (Sun < −12°) | Radiant max. height |
|---|---|---|---|---|---|
| Leonids | 17–18 November 2026 | 30% | 55% | 6.3 | 68° |
| Geminids * | 13–14 December 2026 | 32% | 20% | 10.0 | 80° |
| Geminids * | 14–15 December 2026 | 28% | 28% | 9.0 | 80° |
| Quadrantids | 3–4 January 2027 | 18% | 13% | 11.3 | 67° |
| Lyrids | 22–23 April 2027 | 37% | 95% | 1.2 | 81° |
| Eta Aquariids * | 5–6 May 2027 | 38% | 0% | 7.3 | 20° |
| Eta Aquariids * | 6–7 May 2027 | 33% | 0% | 7.2 | 19° |
| Perseids * | 12–13 August 2027 | 70% | 84% | 3.0 | 66° |
| Perseids * | 13–14 August 2027 | 73% | 90% | 2.0 | 66° |
| Orionids | 21–22 October 2027 | 42% | 59% | 3.5 | 63° |
| Leonids * | 17–18 November 2027 | 30% | 82% | 1.8 | 68° |
| Leonids * | 18–19 November 2027 | 35% | 73% | 3.2 | 68° |
| Geminids | 14–15 December 2027 | 28% | 98% | 0.0 | 80° |
* The peak falls in daylight in Europe, so both neighbouring nights are shown.
Clear peak night: at least 2 hours with ≤ 20 % cloud while the Sun is below −12°, on the same calendar night ± 1 in 2006–2025.