Can you see the northern lights in Tromsdalen in October?

On dark, clear nights with enough activity. 31 of 31 nights at Tromsdalen have civil darkness, and 12% of past October days reached Kp 5.

How dark is Tromsdalen in October?

Tromsdalen averages 12.8 hours of civil night a night in October 2026, from 10 h 45 min on the 1st to 14 h 46 min on the last night.

How cloudy is Tromsdalen in October?

NASA POWER's 2001 to 2020 climatology gives Tromsdalen's 1 degree cell 83% mean cloud in October, against 82% for the whole year. It is an all-hours average, not a forecast.

What is the best night in October 2026 for aurora in Tromsdalen?

By darkness and moon alone, Oct 7, with 4 h of moon-free darkness inside 10 PM to 2 AM at Tromsdalen. Activity on that date will only be known hours ahead.

Is October or November better in Tromsdalen?

By civil night times the clear share, October scores 2.2 hours at Tromsdalen and November 2.7. November comes out ahead.

Tromsdalen · October 2026

Northern lights in Tromsdalen in October 2026

Answer

October gives Tromsdalen 12.7 hours of civil night on the 15th, the 5th darkest of its 12 months, under 83% mean cloud. 12% of October days since 1996 reached storm level, Kp 5.

12.8 h

civil night, average night

SunCalc for 69.65, 19.02; NASA POWER; GFZ Kp

October against the rest of the year

3.0

2.4

1.5

0.9

0.0

0.1

1.5

2.2

2.7

2.9

October cloud at Tromsdalen averages 83% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 82%. July is Tromsdalen's clearest month at 79%. By civil night times clear sky, October scores 2.2 hours at Tromsdalen, 5th of 12. Tromsø, 2 km away, averages the same 83%.

Civil night at Tromsdalen starts October at 10 h 45 min and reaches 14 h 46 min by October 31 as the nights lengthen by 4.0 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 8.0 hours on the 15th.

October night by night

October opens toward a new moon on Oct 10, with full moon on Oct 26, in Europe/Oslo dates. Tromsdalen gets 187 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: Oct 7 (4 h), Oct 8 (4 h), Oct 9 (4 h).

1
69% lit
0.0 h
2
57% lit
0.0 h
3
46% lit
0.0 h
4
35% lit
0.0 h
5
25% lit
3.7 h
6
16% lit
6.6 h
7
8% lit
8.9 h
8
3% lit
11.0 h
9
1% lit
11.9 h
10
0% lit
12.0 h
New
11
2% lit
12.1 h
12
5% lit
12.3 h
13
11% lit
12.4 h
14
17% lit
12.5 h
15
25% lit
12.7 h
16
34% lit
12.8 h
17
43% lit
12.9 h
18
52% lit
13.1 h
19
62% lit
13.2 h
20
71% lit
7.9 h
21
80% lit
5.8 h
22
87% lit
3.9 h
23
94% lit
1.9 h
24
98% lit
0.0 h
25
100% lit
0.0 h
26
99% lit
0.0 h
Full
27
95% lit
0.0 h
28
89% lit
0.0 h
29
81% lit
0.0 h
30
71% lit
0.0 h
31
60% lit
0.0 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 Octobers

Quiet activity already puts the oval edge over Tromsdalen, so storm days matter more: 116 of the 930 October days from 1996 to 2025 (12%) reached Kp 5, one of the three most active months for that level. Tromsdalen sits at 67.5 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.

October across Norway

No month-page town in Norway has more civil night on October 15 than Tromsdalen; the national median is 12.4 hours. Coming from September (8.4 hours at Tromsdalen), October adds darkness, and the nights keep growing into November (16.6 hours on the 15th).

Civil night on October 15 and October cloud, month-page towns in Norway
Town	Civil night	Cloud
Tromsdalen	12.7 h	83%
Tromsø	12.7 h	83%
Alta	12.7 h	84%
Bodø	12.6 h	81%
Harstad	12.6 h	80%
Mo i Rana	12.5 h	83%
Trondheim	12.4 h	80%
Ålesund	12.4 h	82%
Kristiansund	12.4 h	78%
Molde	12.4 h	82%
Levanger	12.4 h	80%
Stjørdalshalsen	12.4 h	80%

Darkness and moon, every night

Tromsdalen, October 2026: each night from local noon to the next noon
Night	Civil	Astronomical	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Thu Oct 1	10 h 45 min	5 h 31 min	0 min	0 min	69%
Fri Oct 2	10 h 54 min	5 h 44 min	0 min	0 min	57%
Sat Oct 3	11 h 2 min	5 h 55 min	0 min	0 min	46%
Sun Oct 4	11 h 11 min	6 h 7 min	0 min	0 min	35%
Mon Oct 5	11 h 19 min	6 h 18 min	3 h 43 min	46 min	25%
Tue Oct 6	11 h 27 min	6 h 29 min	6 h 37 min	3 h 26 min	16%
Wed Oct 7	11 h 35 min	6 h 40 min	8 h 52 min	4 h	8%
Thu Oct 8	11 h 44 min	6 h 50 min	10 h 58 min	4 h	3%
Fri Oct 9	11 h 52 min	7 h	11 h 52 min	4 h	1%
Sat Oct 10	12 h	7 h 10 min	12 h	4 h	0%
Sun Oct 11	12 h 8 min	7 h 20 min	12 h 8 min	4 h	2%
Mon Oct 12	12 h 16 min	7 h 29 min	12 h 16 min	4 h	5%
Tue Oct 13	12 h 24 min	7 h 39 min	12 h 24 min	4 h	11%
Wed Oct 14	12 h 32 min	7 h 48 min	12 h 32 min	4 h	17%
Thu Oct 15	12 h 40 min	7 h 57 min	12 h 40 min	4 h	25%
Fri Oct 16	12 h 48 min	8 h 6 min	12 h 48 min	4 h	34%
Sat Oct 17	12 h 56 min	8 h 14 min	12 h 56 min	4 h	43%
Sun Oct 18	13 h 4 min	8 h 23 min	13 h 4 min	4 h	52%
Mon Oct 19	13 h 12 min	8 h 31 min	13 h 12 min	4 h	62%
Tue Oct 20	13 h 20 min	8 h 40 min	7 h 52 min	2 h 42 min	71%
Wed Oct 21	13 h 28 min	8 h 48 min	5 h 47 min	33 min	80%
Thu Oct 22	13 h 36 min	8 h 56 min	3 h 51 min	0 min	87%
Fri Oct 23	13 h 44 min	9 h 4 min	1 h 54 min	0 min	94%
Sat Oct 24	13 h 52 min	9 h 12 min	0 min	0 min	98%
Sun Oct 25	13 h 59 min	9 h 19 min	0 min	0 min	100%
Mon Oct 26	14 h 7 min	9 h 27 min	0 min	0 min	99%
Tue Oct 27	14 h 15 min	9 h 35 min	0 min	0 min	95%
Wed Oct 28	14 h 23 min	9 h 42 min	0 min	0 min	89%
Thu Oct 29	14 h 31 min	9 h 49 min	0 min	0 min	81%
Fri Oct 30	14 h 38 min	9 h 56 min	0 min	0 min	71%
Sat Oct 31	14 h 46 min	10 h 3 min	0 min	0 min	60%

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

Questions

Can you see the northern lights in Tromsdalen in October?: On dark, clear nights with enough activity. 31 of 31 nights at Tromsdalen have civil darkness, and 12% of past October days reached Kp 5.
How dark is Tromsdalen in October?: Tromsdalen averages 12.8 hours of civil night a night in October 2026, from 10 h 45 min on the 1st to 14 h 46 min on the last night.
How cloudy is Tromsdalen in October?: NASA POWER's 2001 to 2020 climatology gives Tromsdalen's 1 degree cell 83% mean cloud in October, against 82% for the whole year. It is an all-hours average, not a forecast.
What is the best night in October 2026 for aurora in Tromsdalen?: By darkness and moon alone, Oct 7, with 4 h of moon-free darkness inside 10 PM to 2 AM at Tromsdalen. Activity on that date will only be known hours ahead.
Is October or November better in Tromsdalen?: By civil night times the clear share, October scores 2.2 hours at Tromsdalen and November 2.7. November 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.