Can you see the northern lights in Sligo in June?

On dark, clear nights with enough activity. 30 of 30 nights at Sligo have civil darkness, and 8% of past June days reached Kp 5.

How dark is Sligo in June?

Sligo averages 4.9 hours of civil night a night in June 2027, from 5 h 14 min on the 1st to 4 h 52 min on the last night.

How cloudy is Sligo in June?

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

What is the best night in June 2027 for aurora in Sligo?

By darkness and moon alone, Jun 1, with 3 h 5 min of moon-free darkness inside 10 PM to 2 AM at Sligo. Activity on that date will only be known hours ahead.

Is June or July better in Sligo?

By civil night times the clear share, June scores 0.9 hours at Sligo and July 0.8. June comes out ahead.

Sligo · June 2027

Northern lights in Sligo in June 2027

Answer

June gives Sligo 4.8 hours of civil night on the 15th, the lightest month of its year, under 81% mean cloud. 8% of June days since 1996 reached Kp 5, enough for the oval edge to reach Sligo.

4.9 h

civil night, average night

SunCalc for 54.27, -8.47; NASA POWER; GFZ Kp

June against the rest of the year

2.3

2.1

2.0

1.5

0.9

0.8

1.3

2.0

2.6

2.5

2.6

June cloud at Sligo averages 81% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 81%. May is Sligo's clearest month at 76%. By civil night times clear sky, June scores 0.9 hours at Sligo, 11th of 12. Belfast, 168 km away, averages 75%, clearer by 6 points.

Civil night at Sligo starts June at 5 h 14 min and reaches 4 h 52 min by June 30, 0.4 hours shorter. No night keeps the 10 PM to 2 AM window fully dark at Sligo. The sun never reaches 18 degrees down, so Sligo gets no astronomical night in June.

June night by night

June opens toward a new moon on Jun 4, with full moon on Jun 19, in Europe/Dublin dates. Sligo gets 66 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: Jun 1 (3 h 5 min), Jun 2 (3 h 4 min), Jun 3 (3 h 2 min).

1
11% lit
4.3 h
2
5% lit
4.6 h
3
1% lit
5.2 h
4
0% lit
5.1 h
New
5
2% lit
4.5 h
6
7% lit
3.8 h
7
14% lit
3.3 h
8
23% lit
2.9 h
9
33% lit
2.7 h
10
45% lit
2.5 h
11
56% lit
2.3 h
12
66% lit
2.1 h
13
76% lit
1.9 h
14
84% lit
1.6 h
15
91% lit
1.3 h
16
96% lit
0.9 h
17
99% lit
0.2 h
18
100% lit
0.0 h
19
99% lit
0.0 h
Full
20
97% lit
0.5 h
21
92% lit
0.8 h
22
87% lit
1.1 h
23
80% lit
1.2 h
24
71% lit
1.4 h
25
62% lit
1.5 h
26
53% lit
1.7 h
27
42% lit
1.9 h
28
32% lit
2.1 h
29
23% lit
2.4 h
30
14% lit
2.8 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 Junes

Sligo needs Kp 5 for the average oval edge to sit overhead. 73 of the 900 June days from 1996 to 2025 (8%) reached it in the GFZ Potsdam record, 9th of 12 months; storm days with Kp 5 or more made up 8%. Sligo sits at 57.3 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.

June across Ireland

Sligo ranks 4th in Ireland for civil night on June 15, behind Cork at 5.5 hours. Coming from May (6.2 hours at Sligo), June loses darkness, and the nights keep growing into July (5.5 hours on the 15th). The June solstice falls on June 21, 15:07 Sligo time.

Civil night on June 15 and June cloud, month-page towns in Ireland
Town	Civil night	Cloud
Cork	5.5 h	69%
Limerick	5.3 h	77%
Dublin	5.1 h	76%
Sligo	4.8 h	81%

Darkness and moon, every night

Sligo, June 2027: each night from local noon to the next noon
Night	Civil	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Tue Jun 1	5 h 14 min	4 h 19 min	3 h 5 min	11%
Wed Jun 2	5 h 11 min	4 h 38 min	3 h 4 min	5%
Thu Jun 3	5 h 9 min	5 h 9 min	3 h 2 min	1%
Fri Jun 4	5 h 6 min	5 h 6 min	3 h 1 min	0%
Sat Jun 5	5 h 4 min	4 h 31 min	2 h 27 min	2%
Sun Jun 6	5 h 1 min	3 h 45 min	1 h 42 min	7%
Mon Jun 7	4 h 59 min	3 h 15 min	1 h 13 min	14%
Tue Jun 8	4 h 57 min	2 h 55 min	53 min	23%
Wed Jun 9	4 h 55 min	2 h 40 min	39 min	33%
Thu Jun 10	4 h 54 min	2 h 27 min	27 min	45%
Fri Jun 11	4 h 52 min	2 h 17 min	17 min	56%
Sat Jun 12	4 h 51 min	2 h 6 min	7 min	66%
Sun Jun 13	4 h 49 min	1 h 54 min	0 min	76%
Mon Jun 14	4 h 48 min	1 h 39 min	0 min	84%
Tue Jun 15	4 h 47 min	1 h 20 min	0 min	91%
Wed Jun 16	4 h 46 min	53 min	0 min	96%
Thu Jun 17	4 h 46 min	14 min	0 min	99%
Fri Jun 18	4 h 45 min	0 min	0 min	100%
Sat Jun 19	4 h 45 min	2 min	2 min	99%
Sun Jun 20	4 h 45 min	30 min	30 min	97%
Mon Jun 21	4 h 45 min	49 min	49 min	92%
Tue Jun 22	4 h 45 min	1 h 3 min	1 h 3 min	87%
Wed Jun 23	4 h 45 min	1 h 14 min	1 h 14 min	80%
Thu Jun 24	4 h 46 min	1 h 23 min	1 h 23 min	71%
Fri Jun 25	4 h 46 min	1 h 32 min	1 h 32 min	62%
Sat Jun 26	4 h 47 min	1 h 41 min	1 h 41 min	53%
Sun Jun 27	4 h 48 min	1 h 51 min	1 h 51 min	42%
Mon Jun 28	4 h 49 min	2 h 4 min	2 h 4 min	32%
Tue Jun 29	4 h 50 min	2 h 22 min	2 h 22 min	23%
Wed Jun 30	4 h 52 min	2 h 48 min	2 h 48 min	14%

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

Questions

Can you see the northern lights in Sligo in June?: On dark, clear nights with enough activity. 30 of 30 nights at Sligo have civil darkness, and 8% of past June days reached Kp 5.
How dark is Sligo in June?: Sligo averages 4.9 hours of civil night a night in June 2027, from 5 h 14 min on the 1st to 4 h 52 min on the last night.
How cloudy is Sligo in June?: NASA POWER's 2001 to 2020 climatology gives Sligo's 1 degree cell 81% mean cloud in June, against 81% for the whole year. It is an all-hours average, not a forecast.
What is the best night in June 2027 for aurora in Sligo?: By darkness and moon alone, Jun 1, with 3 h 5 min of moon-free darkness inside 10 PM to 2 AM at Sligo. Activity on that date will only be known hours ahead.
Is June or July better in Sligo?: By civil night times the clear share, June scores 0.9 hours at Sligo and July 0.8. June 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.