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Luleå · April 2027

Northern lights in Luleå in April 2027

Answer

April gives Luleå 6.4 hours of civil night on the 15th, the 8th darkest of its 12 months, under 76% mean cloud. 82% of April days since 1996 reached Kp 2, enough for the oval edge to reach Luleå.
6.3 h
civil night, average night
SunCalc for 65.58, 22.15; NASA POWER; GFZ Kp

April against the rest of the year

April cloud at Luleå averages 76% in NASA POWER's 2001 to 2020 record, 2 points cloudier than its yearly mean. July is Luleå's clearest month at 66%. By civil night times clear sky, April scores 1.5 hours at Luleå, 8th of 12. Boden, 34 km away, averages 68%, clearer by 8 points.

Civil night at Luleå starts April at 8 h 23 min and reaches 3 h 56 min by April 30, 4.5 hours shorter. The 10 PM to 2 AM window is fully dark on 24 of 30 nights. The sun never reaches 18 degrees down, so Luleå gets no astronomical night in April.

April night by night

April opens toward a new moon on Apr 7, with full moon on Apr 21, in Europe/Stockholm dates. Luleå gets 104 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. 1

    24% lit

    8.4 h

  2. 2

    16% lit

    8.3 h

  3. 3

    10% lit

    8.1 h

  4. 4

    5% lit

    8.0 h

  5. 5

    1% lit

    7.8 h

  6. 6

    0% lit

    7.7 h

  7. 7

    1% lit

    6.9 h

  8. 8

    5% lit

    4.8 h

  9. 9

    10% lit

    1.1 h

  10. 10

    18% lit

    0.0 h

  11. 11

    28% lit

    0.0 h

  12. 12

    38% lit

    0.0 h

  13. 13

    50% lit

    0.0 h

  14. 14

    61% lit

    0.0 h

  15. 15

    72% lit

    0.0 h

  16. 16

    81% lit

    0.0 h

  17. 17

    89% lit

    0.0 h

  18. 18

    95% lit

    0.0 h

  19. 19

    99% lit

    0.0 h

  20. 20

    100% lit

    0.0 h

  21. 21

    99% lit

    1.3 h

  22. 22

    96% lit

    5.4 h

  23. 23

    91% lit

    5.2 h

  24. 24

    84% lit

    5.0 h

  25. 25

    76% lit

    4.9 h

  26. 26

    68% lit

    4.7 h

  27. 27

    59% lit

    4.5 h

  28. 28

    49% lit

    4.3 h

  29. 29

    40% lit

    4.1 h

  30. 30

    31% lit

    3.9 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

Luleå needs Kp 2 for the average oval edge to sit overhead. 735 of the 900 April days from 1996 to 2025 (82%) reached it in the GFZ Potsdam record, 4th of 12 months; storm days with Kp 5 or more made up 12%. Luleå sits at 63.3 degrees geomagnetic, inside SWPC's 60 to 75 degree band, where aurora can be seen on more than half of all nights. No storm is needed: by SWPC's rule the average oval edge is overhead at Kp 2.

April across Sweden

Luleå ranks 19th in Sweden for civil night on April 15, behind Malmö at 8.3 hours. Coming from March (10.4 hours at Luleå), April loses darkness, and May brings shorter nights (0.0 hours on the 15th).

Civil night on April 15 and April cloud, month-page towns in Sweden
TownCivil nightCloud
Malmö8.3 h59%
Helsingborg8.3 h66%
Gothenburg8.1 h65%
Jönköping8.0 h63%
Linköping7.9 h65%
Stockholm7.8 h69%
Örebro7.8 h69%
Sollentuna7.8 h70%
Västerås7.8 h70%
Uppsala7.7 h70%
Hudiksvall7.4 h65%
Sundsvall7.2 h67%
Luleå6.4 h76%

Darkness and moon, every night

Luleå, April 2027: each night from local noon to the next noon
NightCivilAstronomicalMoon-free darkMoon-free, 10 PM to 2 AMMoon lit
Thu Apr 18 h 23 min2 h 22 min8 h 23 min4 h24%
Fri Apr 28 h 15 min1 h 57 min8 h 15 min4 h16%
Sat Apr 38 h 7 min1 h 25 min8 h 7 min4 h10%
Sun Apr 47 h 59 min29 min7 h 59 min4 h5%
Mon Apr 57 h 51 min0 min7 h 51 min4 h1%
Tue Apr 67 h 43 min0 min7 h 43 min4 h0%
Wed Apr 77 h 35 min0 min6 h 55 min4 h1%
Thu Apr 87 h 27 min0 min4 h 45 min2 h 29 min5%
Fri Apr 97 h 19 min0 min1 h 5 min0 min10%
Sat Apr 107 h 10 min0 min0 min0 min18%
Sun Apr 117 h 2 min0 min0 min0 min28%
Mon Apr 126 h 53 min0 min0 min0 min38%
Tue Apr 136 h 45 min0 min0 min0 min50%
Wed Apr 146 h 36 min0 min0 min0 min61%
Thu Apr 156 h 27 min0 min0 min0 min72%
Fri Apr 166 h 18 min0 min0 min0 min81%
Sat Apr 176 h 9 min0 min0 min0 min89%
Sun Apr 186 h0 min0 min0 min95%
Mon Apr 195 h 51 min0 min0 min0 min99%
Tue Apr 205 h 42 min0 min0 min0 min100%
Wed Apr 215 h 32 min0 min1 h 19 min59 min99%
Thu Apr 225 h 22 min0 min5 h 22 min4 h96%
Fri Apr 235 h 13 min0 min5 h 13 min4 h91%
Sat Apr 245 h 2 min0 min5 h 2 min4 h84%
Sun Apr 254 h 52 min0 min4 h 52 min3 h 57 min76%
Mon Apr 264 h 42 min0 min4 h 42 min3 h 52 min68%
Tue Apr 274 h 31 min0 min4 h 31 min3 h 47 min59%
Wed Apr 284 h 20 min0 min4 h 20 min3 h 41 min49%
Thu Apr 294 h 8 min0 min4 h 8 min3 h 36 min40%
Fri Apr 303 h 56 min0 min3 h 56 min3 h 30 min31%
Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Luleå in April?
On dark, clear nights with enough activity. 30 of 30 nights at Luleå have civil darkness, and 82% of past April days reached Kp 2.
How dark is Luleå in April?
Luleå averages 6.3 hours of civil night a night in April 2027, from 8 h 23 min on the 1st to 3 h 56 min on the last night.
How cloudy is Luleå in April?
NASA POWER's 2001 to 2020 climatology gives Luleå's 1 degree cell 76% mean cloud in April, against 74% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Luleå?
By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Luleå. Activity on that date will only be known hours ahead.
Is April or May better in Luleå?
By civil night times the clear share, April scores 1.5 hours at Luleå and May 0.0. April comes out ahead.

Sources and verification

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.