Can you see the northern lights in Keflavík in October?

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

How dark is Keflavík in October?

Keflavík averages 12.5 hours of civil night a night in October 2026, from 10 h 59 min on the 1st to 14 h on the last night.

How cloudy is Keflavík in October?

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

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

By darkness and moon alone, Oct 6, with 4 h of moon-free darkness inside 10 PM to 2 AM at Keflavík. Activity on that date will only be known hours ahead.

Is October or November better in Keflavík?

By civil night times the clear share, October scores 2.4 hours at Keflavík and November 2.6. November comes out ahead.

Keflavík · October 2026

Northern lights in Keflavík in October 2026

Answer

October gives Keflavík 12.4 hours of civil night on the 15th, the 5th darkest of its 12 months, under 81% mean cloud. 12% of October days since 1996 reached storm level, Kp 5.

12.5 h

civil night, average night

SunCalc for 64.00, -22.56; NASA POWER; GFZ Kp

October against the rest of the year

2.6

2.3

1.9

1.3

0.3

0.0

1.2

1.7

2.4

2.6

3.1

October cloud at Keflavík averages 81% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 81%. May is Keflavík's clearest month at 77%. By civil night times clear sky, October scores 2.4 hours at Keflavík, 4th of 12. Reykjanesbær, 1 km away, averages 80%, clearer by 1 points.

Civil night at Keflavík starts October at 10 h 59 min and reaches 14 h by October 31 as the nights lengthen by 3.0 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 8.8 hours on the 15th.

October night by night

October opens toward a new moon on Oct 10, with full moon on Oct 26, in Atlantic/Reykjavik dates. Keflavík gets 185 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 6 (4 h), Oct 7 (4 h), Oct 8 (4 h).

1
68% lit
0.0 h
2
57% lit
0.0 h
3
45% lit
0.5 h
4
34% lit
3.4 h
5
24% lit
5.5 h
6
15% lit
7.5 h
7
8% lit
9.3 h
8
3% lit
11.1 h
9
1% lit
11.8 h
10
0% lit
11.9 h
New
11
2% lit
12.0 h
12
6% lit
12.1 h
13
11% lit
12.2 h
14
18% lit
12.3 h
15
26% lit
12.4 h
16
35% lit
12.5 h
17
44% lit
12.7 h
18
53% lit
10.1 h
19
63% lit
8.2 h
20
72% lit
6.5 h
21
80% lit
4.9 h
22
88% lit
3.3 h
23
94% lit
1.6 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
2.4 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 Keflavík, 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. Keflavík sits at 68.8 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 Iceland

Keflavík ranks 4th in Iceland for civil night on October 15, behind Reykjavík at 12.5 hours. Coming from September (9.2 hours at Keflavík), October adds darkness, and the nights keep growing into November (15.3 hours on the 15th).

Civil night on October 15 and October cloud, month-page towns in Iceland
Town	Civil night	Cloud
Reykjavík	12.5 h	78%
Hafnarfjörður	12.5 h	78%
Akureyri	12.5 h	83%
Keflavík	12.4 h	81%
Reykjanesbær	12.4 h	80%

Darkness and moon, every night

Keflavík, 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 59 min	7 h 6 min	0 min	0 min	68%
Fri Oct 2	11 h 6 min	7 h 13 min	0 min	0 min	57%
Sat Oct 3	11 h 12 min	7 h 21 min	32 min	0 min	45%
Sun Oct 4	11 h 18 min	7 h 29 min	3 h 22 min	1 h 2 min	34%
Mon Oct 5	11 h 25 min	7 h 36 min	5 h 32 min	3 h 9 min	24%
Tue Oct 6	11 h 31 min	7 h 43 min	7 h 30 min	4 h	15%
Wed Oct 7	11 h 37 min	7 h 50 min	9 h 20 min	4 h	8%
Thu Oct 8	11 h 43 min	7 h 57 min	11 h 5 min	4 h	3%
Fri Oct 9	11 h 50 min	8 h 4 min	11 h 50 min	4 h	1%
Sat Oct 10	11 h 56 min	8 h 11 min	11 h 56 min	4 h	0%
Sun Oct 11	12 h 2 min	8 h 18 min	12 h 2 min	4 h	2%
Mon Oct 12	12 h 8 min	8 h 25 min	12 h 8 min	4 h	6%
Tue Oct 13	12 h 14 min	8 h 32 min	12 h 14 min	4 h	11%
Wed Oct 14	12 h 20 min	8 h 38 min	12 h 20 min	4 h	18%
Thu Oct 15	12 h 26 min	8 h 45 min	12 h 26 min	4 h	26%
Fri Oct 16	12 h 32 min	8 h 51 min	12 h 32 min	4 h	35%
Sat Oct 17	12 h 39 min	8 h 57 min	12 h 39 min	4 h	44%
Sun Oct 18	12 h 45 min	9 h 3 min	10 h 8 min	4 h	53%
Mon Oct 19	12 h 51 min	9 h 10 min	8 h 14 min	2 h 33 min	63%
Tue Oct 20	12 h 57 min	9 h 16 min	6 h 32 min	48 min	72%
Wed Oct 21	13 h 2 min	9 h 22 min	4 h 54 min	0 min	80%
Thu Oct 22	13 h 8 min	9 h 28 min	3 h 17 min	0 min	88%
Fri Oct 23	13 h 14 min	9 h 34 min	1 h 38 min	0 min	94%
Sat Oct 24	13 h 20 min	9 h 39 min	0 min	0 min	98%
Sun Oct 25	13 h 26 min	9 h 45 min	0 min	0 min	100%
Mon Oct 26	13 h 32 min	9 h 51 min	0 min	0 min	99%
Tue Oct 27	13 h 38 min	9 h 56 min	0 min	0 min	95%
Wed Oct 28	13 h 43 min	10 h 2 min	0 min	0 min	89%
Thu Oct 29	13 h 49 min	10 h 7 min	0 min	0 min	81%
Fri Oct 30	13 h 55 min	10 h 13 min	0 min	0 min	71%
Sat Oct 31	14 h	10 h 18 min	2 h 22 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 Keflavík in October?: On dark, clear nights with enough activity. 31 of 31 nights at Keflavík have civil darkness, and 12% of past October days reached Kp 5.
How dark is Keflavík in October?: Keflavík averages 12.5 hours of civil night a night in October 2026, from 10 h 59 min on the 1st to 14 h on the last night.
How cloudy is Keflavík in October?: NASA POWER's 2001 to 2020 climatology gives Keflavík's 1 degree cell 81% mean cloud in October, against 81% for the whole year. It is an all-hours average, not a forecast.
What is the best night in October 2026 for aurora in Keflavík?: By darkness and moon alone, Oct 6, with 4 h of moon-free darkness inside 10 PM to 2 AM at Keflavík. Activity on that date will only be known hours ahead.
Is October or November better in Keflavík?: By civil night times the clear share, October scores 2.4 hours at Keflavík and November 2.6. 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.