Ushuaia · August 2027
Southern lights in Ushuaia in August 2027
Answer
August against the rest of the year
August cloud at Ushuaia averages 76% in NASA POWER's 2001 to 2020 record, 2 points clearer than its yearly mean. July is Ushuaia's clearest month at 72%. By civil night times clear sky, August scores 3.1 hours at Ushuaia, 4th of 12. Buffalo, 10,909 km away, averages 56%, clearer by 20 points.
Civil night at Ushuaia starts August at 13 h 56 min and reaches 12 h 5 min by August 31, 1.9 hours shorter. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 10.3 hours on the 15th.
August night by night
August opens toward a new moon on Aug 2 and Aug 31, with full moon on Aug 17, in America/Argentina/Ushuaia dates. Ushuaia gets 205 hours of civil night with the moon below the horizon across the month. The best of them for moon-free darkness inside 10 PM to 2 AM: Aug 1 (4 h), Aug 2 (4 h), Aug 3 (4 h).
- 1
0% lit
13.9 h
- 2
1% lit
13.9 h
- 3
4% lit
12.4 h
- 4
11% lit
10.8 h
- 5
19% lit
9.3 h
- 6
29% lit
7.8 h
- 7
39% lit
6.3 h
- 8
49% lit
4.9 h
- 9
59% lit
3.5 h
- 10
69% lit
2.4 h
- 11
78% lit
1.4 h
- 12
85% lit
0.7 h
- 13
91% lit
0.2 h
- 14
96% lit
0.0 h
- 15
99% lit
0.0 h
- 16
100% lit
0.0 h
- 17
99% lit
0.1 h
- 18
97% lit
1.3 h
- 19
93% lit
2.5 h
- 20
87% lit
3.7 h
- 21
79% lit
5.0 h
- 22
71% lit
6.3 h
- 23
61% lit
7.7 h
- 24
50% lit
9.1 h
- 25
39% lit
10.3 h
- 26
28% lit
11.2 h
- 27
18% lit
11.8 h
- 28
10% lit
12.2 h
- 29
4% lit
12.2 h
- 30
1% lit
12.2 h
- 31
0% lit
12.1 h
Each cell is the night that starts on that date. Hours are civil-dark time with the moon below the horizon; the green rule scales with them. Green outline: new moon. Bone outline: full moon.
Activity in past Augusts
No whole Kp puts the average oval edge over Ushuaia by SWPC's rule, so the GFZ record has no threshold to count for August. Ushuaia sits at 45.6 degrees geomagnetic. The lowest NOAA storm level whose typical viewing latitude reaches it is G4 (Kp = 8, including a 9-). Even Kp 9 does not put the average oval edge overhead by SWPC's rule.
August across Argentina
Coming from July (14.7 hours at Ushuaia), August loses darkness, and September brings shorter nights (11.0 hours on the 15th).
Darkness and moon, every night
| Night | Civil | Astronomical | Moon-free dark | Moon-free, 10 PM to 2 AM | Moon lit |
|---|---|---|---|---|---|
| Sun Aug 1 | 13 h 56 min | 11 h 4 min | 13 h 56 min | 4 h | 0% |
| Mon Aug 2 | 13 h 53 min | 11 h 1 min | 13 h 53 min | 4 h | 1% |
| Tue Aug 3 | 13 h 49 min | 10 h 58 min | 12 h 24 min | 4 h | 4% |
| Wed Aug 4 | 13 h 46 min | 10 h 55 min | 10 h 49 min | 4 h | 11% |
| Thu Aug 5 | 13 h 43 min | 10 h 52 min | 9 h 17 min | 2 h 47 min | 19% |
| Fri Aug 6 | 13 h 39 min | 10 h 49 min | 7 h 47 min | 1 h 19 min | 29% |
| Sat Aug 7 | 13 h 36 min | 10 h 46 min | 6 h 19 min | 0 min | 39% |
| Sun Aug 8 | 13 h 33 min | 10 h 43 min | 4 h 53 min | 0 min | 49% |
| Mon Aug 9 | 13 h 29 min | 10 h 40 min | 3 h 32 min | 0 min | 59% |
| Tue Aug 10 | 13 h 26 min | 10 h 36 min | 2 h 21 min | 0 min | 69% |
| Wed Aug 11 | 13 h 22 min | 10 h 33 min | 1 h 23 min | 0 min | 78% |
| Thu Aug 12 | 13 h 18 min | 10 h 30 min | 42 min | 0 min | 85% |
| Fri Aug 13 | 13 h 15 min | 10 h 26 min | 12 min | 0 min | 91% |
| Sat Aug 14 | 13 h 11 min | 10 h 23 min | 0 min | 0 min | 96% |
| Sun Aug 15 | 13 h 7 min | 10 h 19 min | 0 min | 0 min | 99% |
| Mon Aug 16 | 13 h 4 min | 10 h 16 min | 0 min | 0 min | 100% |
| Tue Aug 17 | 13 h | 10 h 12 min | 3 min | 0 min | 99% |
| Wed Aug 18 | 12 h 56 min | 10 h 8 min | 1 h 16 min | 0 min | 97% |
| Thu Aug 19 | 12 h 52 min | 10 h 5 min | 2 h 28 min | 0 min | 93% |
| Fri Aug 20 | 12 h 49 min | 10 h 1 min | 3 h 43 min | 54 min | 87% |
| Sat Aug 21 | 12 h 45 min | 9 h 57 min | 5 h | 2 h 13 min | 79% |
| Sun Aug 22 | 12 h 41 min | 9 h 53 min | 6 h 20 min | 3 h 35 min | 71% |
| Mon Aug 23 | 12 h 37 min | 9 h 50 min | 7 h 44 min | 4 h | 61% |
| Tue Aug 24 | 12 h 33 min | 9 h 46 min | 9 h 6 min | 4 h | 50% |
| Wed Aug 25 | 12 h 29 min | 9 h 42 min | 10 h 18 min | 4 h | 39% |
| Thu Aug 26 | 12 h 25 min | 9 h 38 min | 11 h 13 min | 4 h | 28% |
| Fri Aug 27 | 12 h 21 min | 9 h 34 min | 11 h 49 min | 4 h | 18% |
| Sat Aug 28 | 12 h 17 min | 9 h 30 min | 12 h 12 min | 4 h | 10% |
| Sun Aug 29 | 12 h 13 min | 9 h 26 min | 12 h 13 min | 4 h | 4% |
| Mon Aug 30 | 12 h 9 min | 9 h 21 min | 12 h 9 min | 4 h | 1% |
| Tue Aug 31 | 12 h 5 min | 9 h 17 min | 12 h 5 min | 4 h | 0% |
Questions
- Can you see the southern lights in Ushuaia in August?
- On dark, clear nights with enough activity. 31 of 31 nights at Ushuaia have civil darkness.
- How dark is Ushuaia in August?
- Ushuaia averages 13.0 hours of civil night a night in August 2027, from 13 h 56 min on the 1st to 12 h 5 min on the last night.
- How cloudy is Ushuaia in August?
- NASA POWER's 2001 to 2020 climatology gives Ushuaia's 1 degree cell 76% mean cloud in August, against 78% for the whole year. It is an all-hours average, not a forecast.
- What is the best night in August 2027 for aurora in Ushuaia?
- By darkness and moon alone, Aug 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Ushuaia. Activity on that date will only be known hours ahead.
- Is August or September better in Ushuaia?
- By civil night times the clear share, August scores 3.1 hours at Ushuaia and September 2.5. August comes out ahead.
Sources and verification
- SunCalchttps://github.com/mourner/suncalc
- NASA POWER climatologyhttps://power.larc.nasa.gov/docs/services/api/temporal/climatology/
- GFZ Potsdam Kp indexhttps://kp.gfz.de/en/data
- NOAA SWPC, Tips on viewing the aurorahttps://www.spaceweather.gov/content/tips-viewing-aurora
Quoted figures last checked against their sources on 2026-09-30; next review 2026-12-31. Computed figures come from SunCalc and the IGRF-14 dipole as described in the methodology. Every quote is listed in the sources ledger.