Mariehamn · June 2027
Northern lights in Mariehamn in June 2027
Answer
June against the rest of the year
June cloud at Mariehamn averages 58% in NASA POWER's 2001 to 2020 record, 13 points clearer than its yearly mean. No month at Mariehamn is clearer. By civil night times clear sky, June scores 0.3 hours at Mariehamn, 12th of 12. Uppsala, 130 km away, averages 69%, cloudier by 11 points.
Civil night at Mariehamn starts June at 2 h 24 min and reaches 1 h 7 min by June 30, 1.3 hours shorter. 5 Mariehamn nights this month have no civil darkness at all. No night keeps the 10 PM to 2 AM window fully dark at Mariehamn. The sun never reaches 18 degrees down, so Mariehamn 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/Mariehamn dates. Mariehamn gets 17 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 (1 h 34 min), Jun 2 (1 h 30 min), Jun 3 (1 h 26 min).
- 1
11% lit
2.4 h
- 2
5% lit
2.3 h
- 3
1% lit
2.1 h
- 4
0% lit
2.0 h
- 5
2% lit
1.9 h
- 6
6% lit
1.3 h
- 7
13% lit
1.0 h
- 8
22% lit
0.8 h
- 9
33% lit
0.7 h
- 10
44% lit
0.6 h
- 11
55% lit
0.5 h
- 12
65% lit
0.4 h
- 13
75% lit
0.3 h
- 14
84% lit
0.2 h
- 15
90% lit
0.1 h
- 16
95% lit
0.0 h
- 17
99% lit
0.0 h
- 18
100% lit
0.0 h
- 19
99% lit
no night
- 20
97% lit
no night
- 21
93% lit
no night
- 22
87% lit
no night
- 23
80% lit
no night
- 24
72% lit
0.0 h
- 25
63% lit
0.0 h
- 26
53% lit
0.0 h
- 27
43% lit
0.0 h
- 28
33% lit
0.0 h
- 29
23% lit
0.0 h
- 30
15% lit
0.1 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
Mariehamn needs Kp 4 for the average oval edge to sit overhead. 182 of the 900 June days from 1996 to 2025 (20%) reached it in the GFZ Potsdam record, one of the three quietest months for that level; storm days with Kp 5 or more made up 8%. Mariehamn sits at 58.4 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 4, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.
June across Aland Islands
Coming from May (4.4 hours at Mariehamn), June loses darkness, and the nights keep growing into July (3.0 hours on the 15th). The June solstice falls on June 21, 17:07 Mariehamn time.
Darkness and moon, every night
| Night | Civil | Astronomical | Moon-free dark | Moon-free, 10 PM to 2 AM | Moon lit |
|---|---|---|---|---|---|
| Tue Jun 1 | 2 h 24 min | 0 min | 2 h 24 min | 1 h 34 min | 11% |
| Wed Jun 2 | 2 h 16 min | 0 min | 2 h 16 min | 1 h 30 min | 5% |
| Thu Jun 3 | 2 h 9 min | 0 min | 2 h 9 min | 1 h 26 min | 1% |
| Fri Jun 4 | 2 h 1 min | 0 min | 2 h 1 min | 1 h 22 min | 0% |
| Sat Jun 5 | 1 h 54 min | 0 min | 1 h 53 min | 1 h 18 min | 2% |
| Sun Jun 6 | 1 h 47 min | 0 min | 1 h 17 min | 45 min | 6% |
| Mon Jun 7 | 1 h 39 min | 0 min | 59 min | 30 min | 13% |
| Tue Jun 8 | 1 h 32 min | 0 min | 48 min | 23 min | 22% |
| Wed Jun 9 | 1 h 24 min | 0 min | 40 min | 19 min | 33% |
| Thu Jun 10 | 1 h 17 min | 0 min | 35 min | 16 min | 44% |
| Fri Jun 11 | 1 h 9 min | 0 min | 30 min | 15 min | 55% |
| Sat Jun 12 | 1 h 1 min | 0 min | 25 min | 14 min | 65% |
| Sun Jun 13 | 54 min | 0 min | 19 min | 12 min | 75% |
| Mon Jun 14 | 46 min | 0 min | 12 min | 9 min | 84% |
| Tue Jun 15 | 38 min | 0 min | 3 min | 3 min | 90% |
| Wed Jun 16 | 29 min | 0 min | 0 min | 0 min | 95% |
| Thu Jun 17 | 20 min | 0 min | 0 min | 0 min | 99% |
| Fri Jun 18 | 8 min | 0 min | 0 min | 0 min | 100% |
| Sat Jun 19 | 0 min | 0 min | 0 min | 0 min | 99% |
| Sun Jun 20 | 0 min | 0 min | 0 min | 0 min | 97% |
| Mon Jun 21 | 0 min | 0 min | 0 min | 0 min | 93% |
| Tue Jun 22 | 0 min | 0 min | 0 min | 0 min | 87% |
| Wed Jun 23 | 0 min | 0 min | 0 min | 0 min | 80% |
| Thu Jun 24 | 17 min | 0 min | 0 min | 0 min | 72% |
| Fri Jun 25 | 27 min | 0 min | 0 min | 0 min | 63% |
| Sat Jun 26 | 36 min | 0 min | 0 min | 0 min | 53% |
| Sun Jun 27 | 44 min | 0 min | 0 min | 0 min | 43% |
| Mon Jun 28 | 51 min | 0 min | 0 min | 0 min | 33% |
| Tue Jun 29 | 59 min | 0 min | 0 min | 0 min | 23% |
| Wed Jun 30 | 1 h 7 min | 0 min | 4 min | 4 min | 15% |
Questions
- Can you see the northern lights in Mariehamn in June?
- On dark, clear nights with enough activity. 25 of 30 nights at Mariehamn have civil darkness, and 20% of past June days reached Kp 4.
- How dark is Mariehamn in June?
- Mariehamn averages 1.0 hours of civil night a night in June 2027, from 2 h 24 min on the 1st to 1 h 7 min on the last night.
- How cloudy is Mariehamn in June?
- NASA POWER's 2001 to 2020 climatology gives Mariehamn's 1 degree cell 58% mean cloud in June, against 71% for the whole year. It is an all-hours average, not a forecast.
- What is the best night in June 2027 for aurora in Mariehamn?
- By darkness and moon alone, Jun 1, with 1 h 34 min of moon-free darkness inside 10 PM to 2 AM at Mariehamn. Activity on that date will only be known hours ahead.
- Is June or July better in Mariehamn?
- By civil night times the clear share, June scores 0.3 hours at Mariehamn and July 1.2. July 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.