Can you see the southern lights in Invercargill in May?

On dark, clear nights with enough activity. 31 of 31 nights at Invercargill have civil darkness, and 1% of past May days reached Kp 8.

How dark is Invercargill in May?

Invercargill averages 13.4 hours of civil night a night in May 2027, from 12 h 52 min on the 1st to 13 h 54 min on the last night.

How cloudy is Invercargill in May?

NASA POWER's 2001 to 2020 climatology gives Invercargill's 1 degree cell 72% mean cloud in May, against 72% for the whole year. It is an all-hours average, not a forecast.

What is the best night in May 2027 for aurora in Invercargill?

By darkness and moon alone, May 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Invercargill. Activity on that date will only be known hours ahead.

Is May or June better in Invercargill?

By civil night times the clear share, May scores 3.8 hours at Invercargill and June 4.2. June comes out ahead.

Invercargill · May 2027

Southern lights in Invercargill in May 2027

Answer

May gives Invercargill 13.4 hours of civil night on the 15th, the 3rd darkest of its 12 months, under 72% mean cloud. 1% of May days since 1996 reached Kp 8, enough for the oval edge to reach Invercargill.

13.4 h

civil night, average night

SunCalc for -46.40, 168.35; NASA POWER; GFZ Kp

May against the rest of the year

1.8

2.4

3.0

3.3

3.8

4.2

4.4

3.9

3.2

2.5

1.8

1.7

May cloud at Invercargill averages 72% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 72%. July is Invercargill's clearest month at 68%. By civil night times clear sky, May scores 3.8 hours at Invercargill, 4th of 12. Anadyr, 12,383 km away, averages 76%, cloudier by 4 points.

Civil night at Invercargill starts May at 12 h 52 min and reaches 13 h 54 min by May 31 as the nights lengthen by 1.0 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 11.0 hours on the 15th.

May night by night

May opens toward a new moon on May 6, with full moon on May 20, in Pacific/Auckland dates. Invercargill gets 207 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: May 1 (4 h), May 2 (4 h), May 3 (4 h).

1
26% lit
8.3 h
2
17% lit
9.5 h
3
10% lit
10.7 h
4
5% lit
11.9 h
5
1% lit
13.1 h
6
0% lit
13.1 h
New
7
2% lit
13.1 h
8
6% lit
13.2 h
9
12% lit
12.2 h
10
21% lit
11.0 h
11
31% lit
9.7 h
12
42% lit
8.3 h
13
54% lit
7.0 h
14
65% lit
5.7 h
15
75% lit
4.5 h
16
84% lit
3.3 h
17
91% lit
2.1 h
18
96% lit
0.9 h
19
99% lit
0.0 h
20
100% lit
0.0 h
Full
21
99% lit
0.0 h
22
96% lit
0.1 h
23
91% lit
1.1 h
24
85% lit
2.1 h
25
78% lit
3.3 h
26
69% lit
4.3 h
27
60% lit
5.5 h
28
51% lit
6.6 h
29
41% lit
7.7 h
30
32% lit
8.8 h
31
22% lit
10.0 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 Mays

Invercargill needs Kp 8 for the average oval edge to sit overhead. 8 of the 930 May days from 1996 to 2025 (1%) reached it in the GFZ Potsdam record, one of the three most active months for that level; storm days with Kp 5 or more made up 10%. Invercargill sits at 50.2 degrees geomagnetic. The lowest NOAA storm level whose typical viewing latitude reaches it is G3 (Kp = 7). By SWPC's rule the average oval edge is overhead only at Kp 8.

May across New Zealand

Coming from April (12.1 hours at Invercargill), May adds darkness, and the nights keep growing into June (14.1 hours on the 15th).

Darkness and moon, every night

Invercargill, May 2027: each night from local noon to the next noon
Night	Civil	Astronomical	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Sat May 1	12 h 52 min	10 h 31 min	8 h 21 min	4 h	26%
Sun May 2	12 h 55 min	10 h 33 min	9 h 30 min	4 h	17%
Mon May 3	12 h 57 min	10 h 36 min	10 h 42 min	4 h	10%
Tue May 4	13 h	10 h 38 min	11 h 57 min	4 h	5%
Wed May 5	13 h 3 min	10 h 41 min	13 h 3 min	4 h	1%
Thu May 6	13 h 5 min	10 h 43 min	13 h 5 min	4 h	0%
Fri May 7	13 h 7 min	10 h 45 min	13 h 7 min	4 h	2%
Sat May 8	13 h 10 min	10 h 47 min	13 h 9 min	4 h	6%
Sun May 9	13 h 12 min	10 h 50 min	12 h 11 min	4 h	12%
Mon May 10	13 h 15 min	10 h 52 min	10 h 59 min	4 h	21%
Tue May 11	13 h 17 min	10 h 54 min	9 h 40 min	4 h	31%
Wed May 12	13 h 19 min	10 h 56 min	8 h 19 min	2 h 56 min	42%
Thu May 13	13 h 22 min	10 h 58 min	7 h 1 min	1 h 36 min	54%
Fri May 14	13 h 24 min	11 h	5 h 44 min	19 min	65%
Sat May 15	13 h 26 min	11 h 2 min	4 h 30 min	0 min	75%
Sun May 16	13 h 28 min	11 h 4 min	3 h 18 min	0 min	84%
Mon May 17	13 h 30 min	11 h 6 min	2 h 5 min	0 min	91%
Tue May 18	13 h 32 min	11 h 7 min	53 min	0 min	96%
Wed May 19	13 h 34 min	11 h 9 min	0 min	0 min	99%
Thu May 20	13 h 36 min	11 h 11 min	0 min	0 min	100%
Fri May 21	13 h 38 min	11 h 13 min	0 min	0 min	99%
Sat May 22	13 h 40 min	11 h 14 min	9 min	0 min	96%
Sun May 23	13 h 42 min	11 h 16 min	1 h 6 min	0 min	91%
Mon May 24	13 h 43 min	11 h 17 min	2 h 9 min	0 min	85%
Tue May 25	13 h 45 min	11 h 19 min	3 h 15 min	0 min	78%
Wed May 26	13 h 47 min	11 h 20 min	4 h 21 min	12 min	69%
Thu May 27	13 h 48 min	11 h 22 min	5 h 28 min	1 h 18 min	60%
Fri May 28	13 h 50 min	11 h 23 min	6 h 34 min	2 h 24 min	51%
Sat May 29	13 h 51 min	11 h 24 min	7 h 41 min	3 h 30 min	41%
Sun May 30	13 h 53 min	11 h 25 min	8 h 50 min	4 h	32%
Mon May 31	13 h 54 min	11 h 27 min	10 h 1 min	4 h	22%

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

Questions

Can you see the southern lights in Invercargill in May?: On dark, clear nights with enough activity. 31 of 31 nights at Invercargill have civil darkness, and 1% of past May days reached Kp 8.
How dark is Invercargill in May?: Invercargill averages 13.4 hours of civil night a night in May 2027, from 12 h 52 min on the 1st to 13 h 54 min on the last night.
How cloudy is Invercargill in May?: NASA POWER's 2001 to 2020 climatology gives Invercargill's 1 degree cell 72% mean cloud in May, against 72% for the whole year. It is an all-hours average, not a forecast.
What is the best night in May 2027 for aurora in Invercargill?: By darkness and moon alone, May 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Invercargill. Activity on that date will only be known hours ahead.
Is May or June better in Invercargill?: By civil night times the clear share, May scores 3.8 hours at Invercargill and June 4.2. 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.