Can you see the northern lights in Harstad in April?

On dark, clear nights with enough activity. 29 of 30 nights at Harstad have civil darkness, and 12% of past April days reached Kp 5.

How dark is Harstad in April?

Harstad averages 4.9 hours of civil night a night in April 2027, from 7 h 45 min on the 1st to 0 min on the last night.

How cloudy is Harstad in April?

NASA POWER's 2001 to 2020 climatology gives Harstad's 1 degree cell 81% mean cloud in April, against 81% for the whole year. It is an all-hours average, not a forecast.

What is the best night in April 2027 for aurora in Harstad?

By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Harstad. Activity on that date will only be known hours ahead.

Is April or May better in Harstad?

By civil night times the clear share, April scores 1.0 hours at Harstad and May 0.0. April comes out ahead.

Harstad · April 2027

Northern lights in Harstad in April 2027

Answer

April gives Harstad 5.3 hours of civil night on the 15th, the 8th darkest of its 12 months, under 81% mean cloud. 12% of April days since 1996 reached storm level, Kp 5.

4.9 h

civil night, average night

SunCalc for 68.80, 16.54; NASA POWER; GFZ Kp

April against the rest of the year

3.5

2.6

1.7

1.0

0.0

0.5

1.5

2.5

3.0

3.2

April cloud at Harstad averages 81% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 81%. July is Harstad's clearest month at 78%. By civil night times clear sky, April scores 1.0 hours at Harstad, 8th of 12. Tromsø, 134 km away, averages the same 81%.

Civil night at Harstad starts April at 7 h 45 min and reaches 0 min by April 30, 7.8 hours shorter. 1 Harstad nights this month have no civil darkness at all. The 10 PM to 2 AM window is fully dark on 12 of 30 nights. The sun never reaches 18 degrees down, so Harstad 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/Oslo dates. Harstad gets 76 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
24% lit
7.8 h
2
16% lit
7.6 h
3
10% lit
7.4 h
4
5% lit
7.3 h
5
1% lit
7.1 h
6
0% lit
6.9 h
7
1% lit
6.0 h
New
8
5% lit
2.2 h
9
10% lit
0.0 h
10
18% lit
0.0 h
11
28% lit
0.0 h
12
38% lit
0.0 h
13
50% lit
0.0 h
14
61% lit
0.0 h
15
72% lit
0.0 h
16
81% lit
0.0 h
17
89% lit
0.0 h
18
95% lit
0.0 h
19
99% lit
0.0 h
20
100% lit
0.0 h
21
99% lit
4.0 h
Full
22
96% lit
3.7 h
23
91% lit
3.4 h
24
84% lit
3.1 h
25
76% lit
2.8 h
26
68% lit
2.5 h
27
59% lit
2.0 h
28
49% lit
1.5 h
29
40% lit
0.7 h
30
31% lit
no night

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

Quiet activity already puts the oval edge over Harstad, so storm days matter more: 106 of the 900 April days from 1996 to 2025 (12%) reached Kp 5, 4th of 12 months. Harstad sits at 67.1 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 0.

April across Norway

Harstad ranks 18th in Norway for civil night on April 15, behind Kristiansand at 8.0 hours. Coming from March (10.2 hours at Harstad), 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 Norway
Town	Civil night	Cloud
Kristiansand	8.0 h	74%
Stavanger	7.9 h	74%
Haugesund	7.8 h	74%
Oslo	7.7 h	70%
Drammen	7.7 h	70%
Bergen	7.6 h	72%
Hamar	7.5 h	66%
Lillehammer	7.5 h	70%
Gjøvik	7.5 h	66%
Ålesund	7.2 h	82%
Kristiansund	7.1 h	73%
Molde	7.1 h	82%
Harstad	5.3 h	81%

Darkness and moon, every night

Harstad, April 2027: each night from local noon to the next noon
Night	Civil	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Thu Apr 1	7 h 45 min	7 h 45 min	4 h	24%
Fri Apr 2	7 h 36 min	7 h 36 min	4 h	16%
Sat Apr 3	7 h 26 min	7 h 26 min	4 h	10%
Sun Apr 4	7 h 16 min	7 h 16 min	4 h	5%
Mon Apr 5	7 h 7 min	7 h 7 min	4 h	1%
Tue Apr 6	6 h 56 min	6 h 56 min	4 h	0%
Wed Apr 7	6 h 46 min	5 h 57 min	3 h 39 min	1%
Thu Apr 8	6 h 36 min	2 h 10 min	46 min	5%
Fri Apr 9	6 h 25 min	0 min	0 min	10%
Sat Apr 10	6 h 15 min	0 min	0 min	18%
Sun Apr 11	6 h 4 min	0 min	0 min	28%
Mon Apr 12	5 h 53 min	0 min	0 min	38%
Tue Apr 13	5 h 41 min	0 min	0 min	50%
Wed Apr 14	5 h 30 min	0 min	0 min	61%
Thu Apr 15	5 h 18 min	0 min	0 min	72%
Fri Apr 16	5 h 5 min	0 min	0 min	81%
Sat Apr 17	4 h 53 min	0 min	0 min	89%
Sun Apr 18	4 h 40 min	0 min	0 min	95%
Mon Apr 19	4 h 26 min	0 min	0 min	99%
Tue Apr 20	4 h 12 min	0 min	0 min	100%
Wed Apr 21	3 h 57 min	3 h 57 min	3 h 7 min	99%
Thu Apr 22	3 h 42 min	3 h 42 min	2 h 59 min	96%
Fri Apr 23	3 h 25 min	3 h 25 min	2 h 51 min	91%
Sat Apr 24	3 h 8 min	3 h 8 min	2 h 43 min	84%
Sun Apr 25	2 h 49 min	2 h 49 min	2 h 33 min	76%
Mon Apr 26	2 h 27 min	2 h 27 min	2 h 23 min	68%
Tue Apr 27	2 h 2 min	2 h 2 min	2 h 2 min	59%
Wed Apr 28	1 h 32 min	1 h 32 min	1 h 32 min	49%
Thu Apr 29	44 min	44 min	44 min	40%
Fri Apr 30	0 min	0 min	0 min	31%

Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Harstad in April?: On dark, clear nights with enough activity. 29 of 30 nights at Harstad have civil darkness, and 12% of past April days reached Kp 5.
How dark is Harstad in April?: Harstad averages 4.9 hours of civil night a night in April 2027, from 7 h 45 min on the 1st to 0 min on the last night.
How cloudy is Harstad in April?: NASA POWER's 2001 to 2020 climatology gives Harstad's 1 degree cell 81% mean cloud in April, against 81% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Harstad?: By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Harstad. Activity on that date will only be known hours ahead.
Is April or May better in Harstad?: By civil night times the clear share, April scores 1.0 hours at Harstad and May 0.0. April 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.