Ushuaia · April 2027
Southern lights in Ushuaia in April 2027
Answer
April against the rest of the year
April cloud at Ushuaia averages 78% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 78%. July is Ushuaia's clearest month at 72%. By civil night times clear sky, April scores 2.7 hours at Ushuaia, 5th of 12. Buffalo, 10,909 km away, averages 69%, clearer by 9 points.
Civil night at Ushuaia starts April at 11 h 25 min and reaches 13 h 22 min by April 30 as the nights lengthen by 1.9 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 9.6 hours on the 15th.
April night by night
April opens toward a new moon on Apr 6, with full moon on Apr 20, in America/Argentina/Ushuaia dates. Ushuaia gets 183 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: Apr 1 (4 h), Apr 2 (4 h), Apr 3 (4 h).
- 1
22% lit
6.7 h
- 2
15% lit
8.0 h
- 3
9% lit
9.4 h
- 4
4% lit
10.7 h
- 5
1% lit
11.7 h
- 6
0% lit
11.8 h
- 7
2% lit
11.8 h
- 8
6% lit
11.9 h
- 9
12% lit
12.0 h
- 10
20% lit
11.8 h
- 11
30% lit
11.0 h
- 12
41% lit
9.7 h
- 13
52% lit
8.3 h
- 14
63% lit
6.7 h
- 15
74% lit
5.2 h
- 16
83% lit
3.8 h
- 17
91% lit
2.3 h
- 18
96% lit
0.9 h
- 19
99% lit
0.0 h
- 20
100% lit
0.0 h
- 21
98% lit
0.0 h
- 22
95% lit
0.0 h
- 23
89% lit
0.0 h
- 24
83% lit
0.7 h
- 25
75% lit
1.7 h
- 26
66% lit
2.9 h
- 27
57% lit
4.1 h
- 28
47% lit
5.4 h
- 29
38% lit
6.7 h
- 30
29% lit
8.0 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 Aprils
No whole Kp puts the average oval edge over Ushuaia by SWPC's rule, so the GFZ record has no threshold to count for April. 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.
April across Argentina
Coming from March (10.2 hours at Ushuaia), April adds darkness, and the nights keep growing into May (14.2 hours on the 15th).
Darkness and moon, every night
| Night | Civil | Astronomical | Moon-free dark | Moon-free, 10 PM to 2 AM | Moon lit |
|---|---|---|---|---|---|
| Thu Apr 1 | 11 h 25 min | 8 h 35 min | 6 h 43 min | 4 h | 22% |
| Fri Apr 2 | 11 h 29 min | 8 h 40 min | 8 h 2 min | 4 h | 15% |
| Sat Apr 3 | 11 h 33 min | 8 h 44 min | 9 h 22 min | 4 h | 9% |
| Sun Apr 4 | 11 h 38 min | 8 h 49 min | 10 h 43 min | 4 h | 4% |
| Mon Apr 5 | 11 h 42 min | 8 h 53 min | 11 h 42 min | 4 h | 1% |
| Tue Apr 6 | 11 h 46 min | 8 h 58 min | 11 h 46 min | 4 h | 0% |
| Wed Apr 7 | 11 h 50 min | 9 h 2 min | 11 h 50 min | 4 h | 2% |
| Thu Apr 8 | 11 h 55 min | 9 h 7 min | 11 h 55 min | 4 h | 6% |
| Fri Apr 9 | 11 h 59 min | 9 h 11 min | 11 h 59 min | 4 h | 12% |
| Sat Apr 10 | 12 h 3 min | 9 h 16 min | 11 h 51 min | 4 h | 20% |
| Sun Apr 11 | 12 h 7 min | 9 h 20 min | 10 h 58 min | 4 h | 30% |
| Mon Apr 12 | 12 h 11 min | 9 h 24 min | 9 h 44 min | 4 h | 41% |
| Tue Apr 13 | 12 h 16 min | 9 h 28 min | 8 h 16 min | 2 h 34 min | 52% |
| Wed Apr 14 | 12 h 20 min | 9 h 32 min | 6 h 44 min | 1 h | 63% |
| Thu Apr 15 | 12 h 24 min | 9 h 37 min | 5 h 13 min | 0 min | 74% |
| Fri Apr 16 | 12 h 28 min | 9 h 41 min | 3 h 45 min | 0 min | 83% |
| Sat Apr 17 | 12 h 32 min | 9 h 45 min | 2 h 20 min | 0 min | 91% |
| Sun Apr 18 | 12 h 36 min | 9 h 49 min | 56 min | 0 min | 96% |
| Mon Apr 19 | 12 h 40 min | 9 h 52 min | 0 min | 0 min | 99% |
| Tue Apr 20 | 12 h 44 min | 9 h 56 min | 0 min | 0 min | 100% |
| Wed Apr 21 | 12 h 48 min | 10 h | 0 min | 0 min | 98% |
| Thu Apr 22 | 12 h 52 min | 10 h 4 min | 0 min | 0 min | 95% |
| Fri Apr 23 | 12 h 55 min | 10 h 8 min | 0 min | 0 min | 89% |
| Sat Apr 24 | 12 h 59 min | 10 h 11 min | 40 min | 0 min | 83% |
| Sun Apr 25 | 13 h 3 min | 10 h 15 min | 1 h 40 min | 0 min | 75% |
| Mon Apr 26 | 13 h 7 min | 10 h 19 min | 2 h 51 min | 0 min | 66% |
| Tue Apr 27 | 13 h 11 min | 10 h 22 min | 4 h 7 min | 1 h 3 min | 57% |
| Wed Apr 28 | 13 h 14 min | 10 h 26 min | 5 h 25 min | 2 h 19 min | 47% |
| Thu Apr 29 | 13 h 18 min | 10 h 29 min | 6 h 43 min | 3 h 35 min | 38% |
| Fri Apr 30 | 13 h 22 min | 10 h 33 min | 8 h 1 min | 4 h | 29% |
Questions
- Can you see the southern lights in Ushuaia in April?
- On dark, clear nights with enough activity. 30 of 30 nights at Ushuaia have civil darkness.
- How dark is Ushuaia in April?
- Ushuaia averages 12.4 hours of civil night a night in April 2027, from 11 h 25 min on the 1st to 13 h 22 min on the last night.
- How cloudy is Ushuaia in April?
- NASA POWER's 2001 to 2020 climatology gives Ushuaia's 1 degree cell 78% mean cloud in April, against 78% for the whole year. It is an all-hours average, not a forecast.
- What is the best night in April 2027 for aurora in Ushuaia?
- By darkness and moon alone, Apr 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 April or May better in Ushuaia?
- By civil night times the clear share, April scores 2.7 hours at Ushuaia and May 3.8. May 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.