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Tonight · Sat, 10 October 2026

Isle of Coll stargazing forecast tonight

Hourly clear-sky conditions for observing: cloud by layer, transparency, estimated seeing, moonlight and true astronomical darkness.

56.617°N 6.567°W ·20 m ·Scotland, United Kingdom

NearbyGreenockPaisleyIrvineGlasgowMore nearby
34
/100
Poor conditions
at peak

Cloud or fog is the strongest score limit at the best sampled time.

Site darkness · peer measure
Natural-dark skyNot multiplied into the conditions score
21.9–21.9 mag/arcsec²

The score describes tonight’s conditions. Site darkness helps you choose what to observe.

See target outlook ↓Planet observing times →
Best months at Isle of Coll, Scotland →Moonless nights →
Tonight in context · local sky & season

October historically: 0.0 qualifying nights/month on average (2005–2024). Regional cloud and darkness history, not tonight’s probability or a comparison with the conditions score.

A qualifying historical night has at least 3 hours of astronomical darkness and mean nighttime cloud ≤30%. This does not measure steady air or target visibility. Seasonal history →

Saturn: about 7.3h above 20° during this observing night’s darkness. Longest sampled dark-time opportunity among our four planet targets; not a weather ranking. Planet times →

Position calculations use roughly 20-minute samples. Clouds, skyglow and local obstructions still matter. Milky Way timing →

Best window
None tonight
Window quality
—
Astronomical dark
21:00 – 06:00
Moon
New moon, 1%
Transparency at peak
0.60
Seeing at peak (est.)
0.15
Visual limit (modelled)
6.0–7.0 mag
Tonight's limiting factor
Seeing

Seeing 0.15, estimated from surface wind. Expect to drop magnification. What this means →

Also limiting: Low cloud. See the guide →

The night, hour by hour

Colour = score · Luminance = everything else
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
13
29
34
18
5
5
7
2
10
9
11
1
Score
Low cloud
33%
44%
41%
42%
70%
91%
92%
88%
91%
66%
80%
46%
69%
51%
Mid cloud
47%
29%
27%
13%
6%
8%
9%
8%
59%
48%
27%
62%
52%
60%
High cloud
0%
0%
0%
0%
3%
3%
4%
0%
0%
0%
0%
0%
2%
0%
Transparency
0.22
0.57
0.60
0.60
0.62
0.60
0.59
0.54
0.17
0.12
0.12
0.10
0.10
0.35
Seeing
0.15
0.15
0.15
0.15
0.15
0.18
0.26
0.24
0.30
0.36
0.46
0.59
0.68
0.76
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08
Inspect

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

Score inspectorWhy this hour scored what it did Open peakClose
22 Poor · 34/100
Starting from
100
Cloud
−49
Transparency
−8
Seeing
−9
Moonlight
−0
Darkness
−0
Score
34
CLOUD 46% LOW 42% MID 13% HIGH 0% SUN -27.4° MOON -30.8° / 0% WIND 12 TEMP 11°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What can you actually do tonight?

This is GoodSeeing’s decision layer: the same forecast is weighted for your target and site darkness. Planetary work barely cares about moonlight; long exposures can fail on high cloud a visual observer would barely notice. Your choice is remembered on this device and becomes the default for new alert rules.

SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 39

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

19212301030507
CLOUD RETURNS 23:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 46%
SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 39

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

19212301030507
CLOUD RETURNS 23:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 46%
SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 39

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

19212301030507
CLOUD RETURNS 23:00

Deep-sky visual is your current default.

A darker option

Wood Buffalo National Park

5,588 km away · Natural-dark sky · 21.9–21.9 mag/arcsec²

66conditions tonight
See the trade-off →
Latest verified night · 2026-10-08

Prediction, meet observation.

All comparisons →
9 matches0 discrepanciesSatellite saw 2.4 points more cloud.
EUMETSAT cloud mask · ~12h referenceThe cloud call matched every sampled dark hour.Cloud only · 9 astronomically dark hours

Recent cloud comparisons · 30 recorded nights →

The next week of nights

Tonight · 10 Oct
34
Poor

Cloud or fog is the strongest score limit at the best sampled time.

MOON 0%
Tomorrow · 11 Oct
61
Good
MOON 2%
21:00–00:00
Monday · 12 Oct
36
Fair
MOON 6%
03:00–04:00
Tuesday · 13 Oct
34
Poor

Cloud or fog is the strongest score limit at the best sampled time.

MOON 12%
Wednesday · 14 Oct
1
Not worth it

Cloud or fog is the strongest score limit at the best sampled time.

MOON 19%
Thursday · 15 Oct
62
Good
MOON 27%
01:00–02:00
Friday · 16 Oct
14
Not worth it

Cloud or fog is the strongest score limit at the best sampled time.

MOON 35%

Open a night for its forecast times. Later forecasts may have wider time steps; missing hours are not interpolated.

Tonight · 10 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
13
29
34
18
5
5
7
2
10
9
11
1
Score
Low cloud
33%
44%
41%
42%
70%
91%
92%
88%
91%
66%
80%
46%
69%
51%
Mid cloud
47%
29%
27%
13%
6%
8%
9%
8%
59%
48%
27%
62%
52%
60%
High cloud
0%
0%
0%
0%
3%
3%
4%
0%
0%
0%
0%
0%
2%
0%
Transparency
0.22
0.57
0.60
0.60
0.62
0.60
0.59
0.54
0.17
0.12
0.12
0.10
0.10
0.35
Seeing
0.15
0.15
0.15
0.15
0.15
0.18
0.26
0.24
0.30
0.36
0.46
0.59
0.68
0.76
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08

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

Tomorrow · 11 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
24
61
52
51
10
3
Score
Low cloud
13%
8%
5%
3%
9%
48%
73%
96%
100%
100%
100%
100%
100%
100%
Mid cloud
0%
0%
0%
0%
0%
32%
70%
100%
100%
100%
90%
91%
100%
94%
High cloud
0%
48%
0%
26%
17%
97%
100%
100%
100%
100%
100%
100%
96%
100%
Transparency
0.68
0.62
0.54
0.48
0.46
0.43
0.43
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.29
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08

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

Monday · 12 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
3
2
5
36
26
22
3
1
Score
Low cloud
100%
100%
100%
100%
100%
0%
1%
7%
10%
20%
28%
27%
16%
Mid cloud
77%
98%
94%
99%
100%
100%
100%
100%
20%
34%
57%
100%
100%
High cloud
63%
81%
98%
95%
99%
91%
100%
32%
16%
16%
0%
2%
65%
Transparency
0.10
0.27
0.27
0.10
0.10
0.10
0.10
0.29
0.10
0.10
0.34
0.10
0.37
Seeing
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.32
0.32
0.21
0.35
0.39
0.49
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07

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

Tuesday · 13 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
34
1
Score
Low cloud
6%
21%
53%
Mid cloud
6%
12%
62%
High cloud
41%
48%
100%
Transparency
0.68
0.56
0.36
Seeing
0.15
0.15
0.15
Moon clear
down
down
down
19
01
07

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

Wednesday · 14 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
1
4
Score
Low cloud
81%
58%
35%
Mid cloud
99%
100%
0%
High cloud
100%
89%
100%
Transparency
0.38
0.45
0.57
Seeing
0.15
0.28
0.31
Moon clear
17%
down
down
19
01
07

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

Thursday · 15 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
62
9
Score
Low cloud
6%
9%
39%
Mid cloud
7%
9%
21%
High cloud
0%
0%
0%
Transparency
0.56
0.54
0.54
Seeing
0.64
0.66
0.55
Moon clear
24%
down
down
19
01
07

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

Friday · 16 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
14
1
Score
Low cloud
37%
63%
91%
Mid cloud
4%
51%
21%
High cloud
0%
9%
59%
Transparency
0.63
0.63
0.52
Seeing
0.56
0.59
0.47
Moon clear
33%
down
down
19
01
07

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

Planning a trip?

Compare the next eight weekends → · Best months to visit → · Moonless nights →

More nearby locations 8 options · openclose

About this forecast

Exact-coordinate weather, sky geometry and site context.

Full method →20-year baseline →
Sources and scoring details openclose

Conditions for Isle of Coll, Scotland, United Kingdom 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 astronomical twilight. Site darkness is shown separately, then used only where artificial skyglow physically changes moon contrast, haze scattering, visual limits and target suitability.