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Sept-Îles

50.200° N   66.382° W  ·  5 M
64 /100
PEAK
Worth setting up — 2 hours of workable sky from 02:00.
BEST WINDOW 02:00–04:00 · ASTRO DARK 23:00–03:00 · MOON 0%
Transparency
0.33
Seeing
0.94
Cloud
0%
Moon
0%

Good tonight

Hour by hour, local to Sept-Îles. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
0
20
31
32
32
32
50
64
26
0
BEST WINDOW
Low cloud
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
4%
3%
0%
1%
2%
1%
1%
0%
0%
2%
High cloud
34%
32%
95%
97%
97%
99%
52%
2%
0%
0%
Transparency
0.27
0.32
0.33
0.32
0.32
0.32
0.32
0.31
0.31
0.31
Seeing
0.87
0.94
0.82
0.82
0.85
0.86
0.85
0.85
0.86
0.85
Moon clear
0%
down
down
down
down
down
down
down
down
down
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
20 Clouded out · 0/100
Starting from
100
Cloud
−22
Transparency
−23
Seeing
−2
Moonlight
−0
Darkness
−54
Score
0
CLOUD 37% LOW 1% MID 4% HIGH 34% SUN -2.1° MOON 0.7° / 0% WIND 3 TEMP 16°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 56

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

2022000204
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 04:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 66

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

2022000204
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 51

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

2022000204
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 04:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 52

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

2022000204
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 04:00
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 59

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

2022000204
HIGH CLOUD CLEARS 02:00TWILIGHT BEGINS 04:00
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The next week of nights

Tonight · 12 Aug
64
Good
MOON 0%
02:00–04:00
Tomorrow · 13 Aug
29
Poor
MOON 3%
Friday · 14 Aug
71
Good
MOON 7%
22:00–03:00
Saturday · 15 Aug
58
Good
MOON 15%
02:00–03:00
Sunday · 16 Aug
6
Clouded out
MOON 23%
Monday · 17 Aug
58
Good
MOON 32%
02:00–03:00
Tuesday · 18 Aug
6
Clouded out
MOON 42%
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About this forecast

Conditions for Sept-Îles, Quebec, Canada are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →