Can you see the northern lights in Norrtälje in June?

On dark, clear nights with enough activity. 30 of 30 nights at Norrtälje have civil darkness, and 20% of past June days reached Kp 4.

How dark is Norrtälje in June?

Norrtälje averages 1.6 hours of civil night a night in June 2027, from 2 h 40 min on the 1st to 1 h 39 min on the last night.

How cloudy is Norrtälje in June?

NASA POWER's 2001 to 2020 climatology gives Norrtälje's 1 degree cell 62% mean cloud in June, against 75% for the whole year. It is an all-hours average, not a forecast.

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

By darkness and moon alone, Jun 1, with 2 h 35 min of moon-free darkness inside 10 PM to 2 AM at Norrtälje. Activity on that date will only be known hours ahead.

Is June or July better in Norrtälje?

By civil night times the clear share, June scores 0.5 hours at Norrtälje and July 1.2. July comes out ahead.

Norrtälje · June 2027

Northern lights in Norrtälje in June 2027

Answer

June gives Norrtälje 1.4 hours of civil night on the 15th, the lightest month of its year, under 62% mean cloud. 20% of June days since 1996 reached Kp 4, enough for the oval edge to reach Norrtälje.

1.6 h

civil night, average night

SunCalc for 59.76, 18.70; NASA POWER; GFZ Kp

June against the rest of the year

1.7

1.8

2.4

1.7

0.5

1.2

2.1

2.7

2.3

1.9

June cloud at Norrtälje averages 62% in NASA POWER's 2001 to 2020 record, 13 points clearer than its yearly mean. May is Norrtälje's clearest month at 62%. By civil night times clear sky, June scores 0.5 hours at Norrtälje, 12th of 12. Sollentuna, 56 km away, averages 69%, cloudier by 7 points.

Civil night at Norrtälje starts June at 2 h 40 min and reaches 1 h 39 min by June 30, 1.0 hours shorter. No night keeps the 10 PM to 2 AM window fully dark at Norrtälje. The sun never reaches 18 degrees down, so Norrtälje 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/Stockholm dates. Norrtälje gets 21 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 (2 h 35 min), Jun 2 (2 h 34 min), Jun 3 (2 h 28 min).

1
11% lit
2.6 h
2
5% lit
2.6 h
3
1% lit
2.5 h
4
0% lit
2.4 h
New
5
2% lit
2.1 h
6
6% lit
1.5 h
7
13% lit
1.2 h
8
23% lit
1.0 h
9
33% lit
0.9 h
10
44% lit
0.8 h
11
55% lit
0.8 h
12
66% lit
0.7 h
13
75% lit
0.6 h
14
84% lit
0.5 h
15
91% lit
0.4 h
16
96% lit
0.1 h
17
99% lit
0.0 h
18
100% lit
0.0 h
19
99% lit
0.0 h
Full
20
97% lit
0.0 h
21
93% lit
0.0 h
22
87% lit
0.0 h
23
80% lit
0.0 h
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
0.2 h
30
14% lit
0.4 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 Junes

Norrtälje 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%. Norrtälje sits at 58.3 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 Sweden

Norrtälje ranks 10th in Sweden for civil night on June 15, behind Malmö at 4.3 hours. Coming from May (4.5 hours at Norrtälje), June loses darkness, and the nights keep growing into July (3.2 hours on the 15th). The June solstice falls on June 21, 16:07 Norrtälje time.

Civil night on June 15 and June cloud, month-page towns in Sweden
Town	Civil night	Cloud
Malmö	4.3 h	62%
Helsingborg	4.1 h	67%
Gothenburg	3.2 h	63%
Jönköping	3.2 h	66%
Linköping	2.7 h	67%
Örebro	2.0 h	69%
Stockholm	1.9 h	62%
Sollentuna	1.8 h	69%
Västerås	1.6 h	69%
Norrtälje	1.4 h	62%
Uppsala	1.2 h	69%
Umeå	0.0 h	63%

Darkness and moon, every night

Norrtälje, 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	2 h 40 min	2 h 35 min	2 h 35 min	11%
Wed Jun 2	2 h 34 min	2 h 34 min	2 h 34 min	5%
Thu Jun 3	2 h 28 min	2 h 28 min	2 h 28 min	1%
Fri Jun 4	2 h 21 min	2 h 21 min	2 h 21 min	0%
Sat Jun 5	2 h 15 min	2 h 9 min	2 h 9 min	2%
Sun Jun 6	2 h 9 min	1 h 32 min	1 h 32 min	6%
Mon Jun 7	2 h 3 min	1 h 13 min	1 h 13 min	13%
Tue Jun 8	1 h 57 min	1 h 2 min	1 h 2 min	23%
Wed Jun 9	1 h 51 min	55 min	55 min	33%
Thu Jun 10	1 h 46 min	49 min	49 min	44%
Fri Jun 11	1 h 41 min	45 min	45 min	55%
Sat Jun 12	1 h 35 min	41 min	41 min	66%
Sun Jun 13	1 h 31 min	36 min	36 min	75%
Mon Jun 14	1 h 26 min	30 min	30 min	84%
Tue Jun 15	1 h 22 min	22 min	22 min	91%
Wed Jun 16	1 h 19 min	8 min	8 min	96%
Thu Jun 17	1 h 16 min	0 min	0 min	99%
Fri Jun 18	1 h 14 min	0 min	0 min	100%
Sat Jun 19	1 h 12 min	0 min	0 min	99%
Sun Jun 20	1 h 11 min	0 min	0 min	97%
Mon Jun 21	1 h 11 min	0 min	0 min	93%
Tue Jun 22	1 h 12 min	0 min	0 min	87%
Wed Jun 23	1 h 13 min	0 min	0 min	80%
Thu Jun 24	1 h 15 min	0 min	0 min	72%
Fri Jun 25	1 h 18 min	0 min	0 min	63%
Sat Jun 26	1 h 21 min	0 min	0 min	53%
Sun Jun 27	1 h 25 min	0 min	0 min	43%
Mon Jun 28	1 h 29 min	1 min	1 min	33%
Tue Jun 29	1 h 34 min	10 min	10 min	23%
Wed Jun 30	1 h 39 min	24 min	24 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 Norrtälje in June?: On dark, clear nights with enough activity. 30 of 30 nights at Norrtälje have civil darkness, and 20% of past June days reached Kp 4.
How dark is Norrtälje in June?: Norrtälje averages 1.6 hours of civil night a night in June 2027, from 2 h 40 min on the 1st to 1 h 39 min on the last night.
How cloudy is Norrtälje in June?: NASA POWER's 2001 to 2020 climatology gives Norrtälje's 1 degree cell 62% mean cloud in June, against 75% for the whole year. It is an all-hours average, not a forecast.
What is the best night in June 2027 for aurora in Norrtälje?: By darkness and moon alone, Jun 1, with 2 h 35 min of moon-free darkness inside 10 PM to 2 AM at Norrtälje. Activity on that date will only be known hours ahead.
Is June or July better in Norrtälje?: By civil night times the clear share, June scores 0.5 hours at Norrtälje 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.