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Tonight · Sat, 10 October 2026

Green Valley stargazing forecast tonight

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

31.854°N 110.994°W ·886 m ·Arizona, United States

NearbyTucsonCatalina FoothillsCasas AdobesKitt Peak National ObservatoryMore nearby
91
/100
Excellent conditions
at peak

A genuinely good night — 10 hours of clear, dark sky from 20:00.

Site darkness · peer measure
Brightened skyNot multiplied into the conditions score
20.7–21.2 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 Green Valley, Arizona →Moonless nights →
Tonight in context · local sky & season

October historically: 22.3 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 9.0h 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
20:00 – 06:00
Window quality
65 / 100 avg
Astronomical dark
20:00 – 06:00
Moon
New moon, 1%
Transparency at peak
1.00
Seeing at peak (est.)
0.66
Visual limit (modelled)
5.5–7.0 mag
Tonight's limiting factor
Seeing

Seeing 0.66, estimated from surface wind. Expect to drop magnification. What this means →

The night, hour by hour

Colour = score · Luminance = everything else
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
31
88
91
88
65
62
69
55
58
43
35
Score
BEST WINDOW · 11 H
Low cloud
0%
0%
0%
0%
0%
0%
5%
5%
12%
10%
26%
37%
13%
5%
Mid cloud
16%
11%
1%
1%
2%
16%
16%
2%
10%
6%
11%
9%
6%
8%
High cloud
84%
73%
1%
0%
1%
18%
1%
1%
8%
7%
6%
19%
0%
0%
Transparency
1.00
1.00
1.00
1.00
0.96
0.88
0.77
0.69
0.60
0.57
0.51
0.50
0.52
0.59
Seeing
0.59
0.51
0.57
0.66
0.63
0.57
0.37
0.36
0.39
0.41
0.28
0.34
0.34
0.33
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
18
19
20
21
22
23
00
01
02
03
04
05
06
07
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
21 Excellent · 91/100
Starting from
100
Cloud
−1
Transparency
−0
Seeing
−8
Moonlight
−0
Darkness
−0
Score
91
CLOUD 1% LOW 0% MID 1% HIGH 0% SUN -39.0° MOON -37.9° / 1% WIND 5 TEMP 27°
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 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 46

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

18202200020406
HIGH CLOUD CLEARS 20:00SITE GLOW LIMITS FAINT TARGETS
SET UP 18:30 · OBSERVE 19:00–05:00 · 10H · MEAN 59

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

18202200020406
CLOUD RETURNS 05:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 55

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

18202200020406
HIGH CLOUD CLEARS 20:00
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 53

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

18202200020406
HIGH CLOUD CLEARS 20:00
SET UP 19:30 · OBSERVE 20:00–04:00 · 8H · MEAN 52

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

18202200020406
HIGH CLOUD CLEARS 20:00

Deep-sky visual is your current default.

A darker option

Kitt Peak National Observatory

58 km away · Threatened dark sky · 21.6–21.7 mag/arcsec²

82conditions tonight
See the trade-off →

The next week of nights

Tonight · 10 Oct
91
Excellent
MOON 1%
20:00–06:00
Tomorrow · 11 Oct
86
Excellent
MOON 3%
20:00–06:00
Monday · 12 Oct
78
Excellent
MOON 7%
20:00–00:00
Tuesday · 13 Oct
71
Good
MOON 15%
05:00–06:00
Wednesday · 14 Oct
91
Excellent
MOON 22%
23:00–00:00
Thursday · 15 Oct
100
Excellent
MOON 31%
23:00–00:00
Friday · 16 Oct
100
Excellent
MOON 40%
23:00–00:00

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
31
88
91
88
65
62
69
55
58
43
35
Score
Low cloud
0%
0%
0%
0%
0%
0%
5%
5%
12%
10%
26%
37%
13%
5%
Mid cloud
16%
11%
1%
1%
2%
16%
16%
2%
10%
6%
11%
9%
6%
8%
High cloud
84%
73%
1%
0%
1%
18%
1%
1%
8%
7%
6%
19%
0%
0%
Transparency
1.00
1.00
1.00
1.00
0.96
0.88
0.77
0.69
0.60
0.57
0.51
0.50
0.52
0.59
Seeing
0.59
0.51
0.57
0.66
0.63
0.57
0.37
0.36
0.39
0.41
0.28
0.34
0.34
0.33
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
18
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.

Tomorrow · 11 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
59
86
84
83
81
76
76
74
72
63
61
Score
Low cloud
2%
2%
3%
3%
3%
3%
6%
2%
1%
1%
8%
9%
59%
95%
Mid cloud
1%
1%
1%
0%
1%
0%
0%
1%
2%
3%
9%
9%
15%
8%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.98
0.96
0.89
0.80
0.73
0.68
0.60
0.52
0.46
0.43
0.42
0.41
0.40
0.46
Seeing
0.47
0.59
0.72
0.79
0.84
0.85
0.85
0.86
0.88
0.88
0.87
0.87
0.87
0.81
Moon clear
3%
down
down
down
down
down
down
down
down
down
down
down
down
down
18
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.

Monday · 12 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
56
77
78
68
76
15
Score
Low cloud
3%
4%
7%
6%
13%
7%
80%
5%
Mid cloud
12%
9%
9%
6%
6%
1%
5%
2%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
1.00
0.96
0.88
0.77
0.68
0.62
0.41
1.00
Seeing
0.58
0.68
0.78
0.83
0.83
0.90
1.00
0.55
Moon clear
7%
7%
down
down
down
down
down
10%
18
19
20
21
22
23
05
11

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
49
71
Score
Low cloud
10%
29%
6%
16%
Mid cloud
44%
16%
2%
1%
High cloud
0%
0%
0%
0%
Transparency
0.98
0.49
0.40
0.93
Seeing
0.60
1.00
1.00
1.00
Moon clear
12%
down
down
17%
17
23
05
11

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
91
86
Score
Low cloud
0%
0%
0%
0%
Mid cloud
2%
0%
0%
0%
High cloud
0%
0%
0%
0%
Transparency
1.00
0.78
0.64
1.00
Seeing
0.77
1.00
1.00
1.00
Moon clear
19%
down
down
down
17
23
05
11

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
100
98
Score
Low cloud
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
Transparency
1.00
0.99
0.95
1.00
Seeing
0.73
1.00
1.00
0.82
Moon clear
27%
down
down
down
17
23
05
11

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
100
97
Score
Low cloud
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
Transparency
1.00
1.00
0.92
1.00
Seeing
0.83
1.00
1.00
1.00
Moon clear
35%
down
down
down
17
23
05
11

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 Green Valley, Arizona, United States 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.