Can you see the northern lights in Yellowknife in August?

On dark, clear nights with enough activity. 31 of 31 nights at Yellowknife have civil darkness, and 11% of past August days reached Kp 5.

How dark is Yellowknife in August?

Yellowknife averages 5.9 hours of civil night a night in August 2027, from 3 h 55 min on the 1st to 7 h 45 min on the last night.

How cloudy is Yellowknife in August?

NASA POWER's 2001 to 2020 climatology gives Yellowknife's 1 degree cell 65% mean cloud in August, against 63% for the whole year. It is an all-hours average, not a forecast.

What is the best night in August 2027 for aurora in Yellowknife?

By darkness and moon alone, Aug 28, with 4 h of moon-free darkness inside 10 PM to 2 AM at Yellowknife. Activity on that date will only be known hours ahead.

Is August or September better in Yellowknife?

By civil night times the clear share, August scores 2.1 hours at Yellowknife and September 3.2. September comes out ahead.

Yellowknife · August 2027

Northern lights in Yellowknife in August 2027

Answer

August gives Yellowknife 5.9 hours of civil night on the 15th, the 9th darkest of its 12 months, under 65% mean cloud. 11% of August days since 1996 reached storm level, Kp 5.

5.9 h

civil night, average night

SunCalc for 62.45, -114.37; NASA POWER; GFZ Kp

August against the rest of the year

7.0

6.5

5.4

3.0

1.0

0.0

2.1

3.2

2.4

3.8

7.0

August cloud at Yellowknife averages 65% in NASA POWER's 2001 to 2020 record, 2 points cloudier than its yearly mean. March is Yellowknife's clearest month at 49%. By civil night times clear sky, August scores 2.1 hours at Yellowknife, 9th of 12. Fort McMurray, 659 km away, averages 66%, cloudier by 1 points.

Civil night at Yellowknife starts August at 3 h 55 min and reaches 7 h 45 min by August 31 as the nights lengthen by 3.8 hours. The 10 PM to 2 AM window is fully dark on 5 of 31 nights. The sun never reaches 18 degrees down, so Yellowknife gets no astronomical night in August.

August night by night

August opens toward a new moon on Aug 2 and Aug 31, with full moon on Aug 17, in America/Edmonton dates. Yellowknife gets 90 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: Aug 28 (4 h), Aug 29 (4 h), Aug 30 (4 h).

1
0% lit
3.9 h
2
1% lit
4.1 h
New
3
5% lit
4.2 h
4
12% lit
4.4 h
5
20% lit
4.5 h
6
30% lit
4.7 h
7
40% lit
4.8 h
8
51% lit
4.9 h
9
61% lit
5.1 h
10
70% lit
5.2 h
11
79% lit
5.3 h
12
86% lit
4.8 h
13
92% lit
3.1 h
14
96% lit
1.5 h
15
99% lit
0.0 h
16
100% lit
0.0 h
17
99% lit
0.0 h
Full
18
97% lit
0.0 h
19
92% lit
0.0 h
20
86% lit
0.0 h
21
78% lit
0.0 h
22
69% lit
0.0 h
23
59% lit
0.0 h
24
49% lit
0.0 h
25
38% lit
0.0 h
26
27% lit
0.5 h
27
17% lit
2.5 h
28
9% lit
4.6 h
29
3% lit
6.7 h
30
0% lit
7.7 h
31
0% lit
7.8 h
New

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 Augusts

Quiet activity already puts the oval edge over Yellowknife, so storm days matter more: 99 of the 930 August days from 1996 to 2025 (11%) reached Kp 5, 5th of 12 months. Yellowknife sits at 68.5 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.

August across Canada

Yellowknife ranks 23rd in Canada for civil night on August 15, behind Trois-Rivières at 8.7 hours. Coming from July (0.0 hours at Yellowknife), August adds darkness, and the nights keep growing into September (9.4 hours on the 15th).

Civil night on August 15 and August cloud, month-page towns in Canada
Town	Civil night	Cloud
Trois-Rivières	8.7 h	59%
Sydney	8.7 h	65%
Québec	8.6 h	60%
Greater Sudbury	8.6 h	56%
St. John's	8.5 h	72%
Saguenay	8.4 h	68%
Thunder Bay	8.4 h	64%
Winnipeg	8.3 h	52%
Kelowna	8.3 h	45%
Lethbridge	8.3 h	51%
Regina	8.2 h	53%
Kamloops	8.2 h	50%
Yellowknife	5.9 h	65%

Darkness and moon, every night

Yellowknife, August 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
Sun Aug 1	3 h 55 min	0 min	3 h 55 min	2 h 13 min	0%
Mon Aug 2	4 h 4 min	0 min	4 h 4 min	2 h 18 min	1%
Tue Aug 3	4 h 13 min	0 min	4 h 13 min	2 h 22 min	5%
Wed Aug 4	4 h 22 min	0 min	4 h 22 min	2 h 27 min	12%
Thu Aug 5	4 h 30 min	0 min	4 h 30 min	2 h 31 min	20%
Fri Aug 6	4 h 39 min	0 min	4 h 39 min	2 h 36 min	30%
Sat Aug 7	4 h 47 min	0 min	4 h 47 min	2 h 40 min	40%
Sun Aug 8	4 h 55 min	0 min	4 h 55 min	2 h 44 min	51%
Mon Aug 9	5 h 4 min	0 min	5 h 4 min	2 h 48 min	61%
Tue Aug 10	5 h 12 min	0 min	5 h 12 min	2 h 53 min	70%
Wed Aug 11	5 h 20 min	0 min	5 h 20 min	2 h 57 min	79%
Thu Aug 12	5 h 28 min	0 min	4 h 51 min	2 h 24 min	86%
Fri Aug 13	5 h 35 min	0 min	3 h 6 min	35 min	92%
Sat Aug 14	5 h 43 min	0 min	1 h 28 min	0 min	96%
Sun Aug 15	5 h 51 min	0 min	0 min	0 min	99%
Mon Aug 16	5 h 58 min	0 min	0 min	0 min	100%
Tue Aug 17	6 h 6 min	0 min	0 min	0 min	99%
Wed Aug 18	6 h 13 min	0 min	0 min	0 min	97%
Thu Aug 19	6 h 21 min	0 min	0 min	0 min	92%
Fri Aug 20	6 h 28 min	0 min	0 min	0 min	86%
Sat Aug 21	6 h 35 min	0 min	0 min	0 min	78%
Sun Aug 22	6 h 43 min	0 min	0 min	0 min	69%
Mon Aug 23	6 h 50 min	0 min	0 min	0 min	59%
Tue Aug 24	6 h 57 min	0 min	0 min	0 min	49%
Wed Aug 25	7 h 4 min	0 min	0 min	0 min	38%
Thu Aug 26	7 h 11 min	0 min	29 min	29 min	27%
Fri Aug 27	7 h 18 min	0 min	2 h 28 min	2 h 28 min	17%
Sat Aug 28	7 h 25 min	0 min	4 h 35 min	4 h	9%
Sun Aug 29	7 h 32 min	18 min	6 h 40 min	4 h	3%
Mon Aug 30	7 h 39 min	1 h 16 min	7 h 39 min	4 h	0%
Tue Aug 31	7 h 45 min	1 h 46 min	7 h 45 min	4 h	0%

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

Questions

Can you see the northern lights in Yellowknife in August?: On dark, clear nights with enough activity. 31 of 31 nights at Yellowknife have civil darkness, and 11% of past August days reached Kp 5.
How dark is Yellowknife in August?: Yellowknife averages 5.9 hours of civil night a night in August 2027, from 3 h 55 min on the 1st to 7 h 45 min on the last night.
How cloudy is Yellowknife in August?: NASA POWER's 2001 to 2020 climatology gives Yellowknife's 1 degree cell 65% mean cloud in August, against 63% for the whole year. It is an all-hours average, not a forecast.
What is the best night in August 2027 for aurora in Yellowknife?: By darkness and moon alone, Aug 28, with 4 h of moon-free darkness inside 10 PM to 2 AM at Yellowknife. Activity on that date will only be known hours ahead.
Is August or September better in Yellowknife?: By civil night times the clear share, August scores 2.1 hours at Yellowknife and September 3.2. September 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.