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Tonight · Sun, 11 October 2026

Iriomote-Ishigaki National Park stargazing forecast tonight

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

24.340°N 124.160°E ·20 m ·Okinawa, Japan

77
/100
Excellent conditions
at peak

A genuinely good night — 3 hours of clear, dark sky from 03:00.

Site darkness · peer measure
Threatened dark skyNot multiplied into the conditions score
21.4–21.6 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 Iriomote-Ishigaki National Park, Okinawa →Moonless nights →
Tonight in context · local sky & season

Saturn: about 9.3h 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
03:00 – 06:00
Window quality
77 / 100 avg
Astronomical dark
03:00 – 06:00
Moon
New moon, 0%
Transparency at peak
0.65
Seeing at peak (est.)
0.57
Visual limit (modelled)
5.5–7.0 mag
Tonight's limiting factor
Seeing

Seeing 0.57, 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
76
77
77
24
Score
BEST WINDOW · 4 H
Low cloud
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
Transparency
0.64
0.65
0.65
0.64
0.64
Seeing
0.54
0.57
0.59
0.58
0.58
Moon clear
down
down
down
down
down
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
04 Excellent · 77/100
Starting from
100
Cloud
−0
Transparency
−14
Seeing
−9
Moonlight
−0
Darkness
−0
Score
77
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -36.9° MOON -40.3° / 0% WIND 6 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 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 67

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

030507
TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–07:00 · 4H · MEAN 69

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

030507
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 71

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

030507
TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 66

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

030507
TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 74

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

030507
TWILIGHT BEGINS 06:00

Deep-sky visual is your current default.

A darker option

Ali Observatory

4,380 km away · Natural-dark sky · 21.8–21.9 mag/arcsec²

96conditions tonight
See the trade-off →

The next week of nights

Tonight · 10 Oct
77
Excellent
MOON 0%
02:00–06:00
Tomorrow · 11 Oct
54
Fair
MOON 1%
21:00–06:00
Monday · 12 Oct
58
Good
MOON 5%
20:00–06:00
Tuesday · 13 Oct
73
Good
MOON 8%
21:00–22:00
Wednesday · 14 Oct
64
Good
MOON 17%
21:00–22:00
Thursday · 15 Oct
50
Fair
MOON 24%
03:00–04:00
Friday · 16 Oct
58
Good
MOON 33%
03:00–04:00

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
74
76
77
77
24
Score
Low cloud
0%
0%
0%
0%
0%
0%
Mid cloud
2%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
Transparency
0.64
0.64
0.65
0.65
0.64
0.64
Seeing
0.52
0.54
0.57
0.59
0.58
0.58
Moon clear
down
down
down
down
down
down
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
14
31
36
37
54
52
43
40
47
49
50
11
Score
Low cloud
9%
27%
54%
44%
40%
8%
13%
15%
20%
16%
16%
17%
25%
44%
Mid cloud
0%
0%
0%
1%
6%
9%
6%
11%
11%
12%
9%
8%
17%
49%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.44
0.45
0.44
0.39
0.39
0.33
0.30
0.10
0.10
0.30
0.31
0.34
0.10
0.10
Seeing
0.45
0.44
0.43
0.41
0.44
0.46
0.50
0.51
0.49
0.48
0.50
0.54
0.52
0.54
Moon clear
1%
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
10
40
42
50
58
58
58
56
55
49
53
20
Score
Low cloud
58%
52%
41%
38%
24%
11%
9%
12%
13%
16%
27%
20%
6%
1%
Mid cloud
0%
0%
0%
0%
4%
5%
6%
2%
4%
2%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.43
0.42
0.42
0.42
0.40
0.37
0.36
0.34
0.34
0.33
0.34
0.36
0.37
0.38
Seeing
0.45
0.48
0.52
0.55
0.58
0.62
0.63
0.65
0.66
0.64
0.62
0.57
0.55
0.55
Moon clear
4%
4%
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.

Tuesday · 13 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
73
39
Score
Low cloud
5%
1%
28%
15%
Mid cloud
0%
0%
23%
15%
High cloud
0%
0%
0%
0%
Transparency
0.54
0.54
0.40
0.43
Seeing
0.52
0.58
0.61
0.42
Moon clear
8%
down
down
down
15
21
03
09

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
64
63
Score
Low cloud
17%
2%
7%
13%
Mid cloud
11%
2%
2%
4%
High cloud
0%
0%
0%
0%
Transparency
0.49
0.50
0.45
0.48
Seeing
0.31
0.32
0.51
0.51
Moon clear
13%
down
down
down
15
21
03
09

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
38
50
Score
Low cloud
10%
16%
24%
16%
Mid cloud
2%
38%
3%
8%
High cloud
2%
0%
0%
0%
Transparency
0.52
0.37
0.43
0.41
Seeing
0.53
0.69
0.55
0.71
Moon clear
21%
22%
down
down
15
21
03
09

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
48
58
Score
Low cloud
13%
32%
16%
19%
Mid cloud
9%
0%
2%
9%
High cloud
0%
1%
0%
0%
Transparency
0.52
0.51
0.43
0.44
Seeing
0.88
0.67
0.67
0.67
Moon clear
29%
31%
down
down
15
21
03
09

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

About this forecast

Exact-coordinate weather, sky geometry and site context.

Full method →
Sources and scoring details openclose

Conditions for Iriomote-Ishigaki National Park, Okinawa, Japan 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.