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Khamis Mushait

18.300° N   42.733° E  ·  1998 M
68 /100
PEAK
Worth setting up — 1 hour of workable sky from 21:00.
BEST WINDOW 21:00–22:00 · ASTRO DARK 21:00–05:00 · MOON 0%
Transparency
1.00
Seeing
0.87
Cloud
47%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
68
21
8
9
13
12
37
7
4
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
7%
75%
91%
91%
87%
86%
31%
100%
100%
99%
High cloud
42%
56%
91%
83%
70%
73%
76%
40%
25%
7%
Transparency
1.00
0.86
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Seeing
0.77
0.87
0.68
0.53
0.76
0.55
0.56
0.68
0.76
0.83
Moon clear
down
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
21 Good · 68/100
Starting from
100
Cloud
−28
Transparency
−0
Seeing
−4
Moonlight
−0
Darkness
−0
Score
68
CLOUD 47% LOW 0% MID 7% HIGH 42% SUN -31.7° MOON -29.9° / 0% WIND 4 TEMP 25°
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 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 67

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

2123010305
CLOUD RETURNS 22:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 61

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

2123010305
CLOUD RETURNS 22:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 62

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

2123010305
CLOUD RETURNS 22:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 52

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

2123010305
CLOUD RETURNS 22:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 64

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

2123010305
CLOUD RETURNS 22:00
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The next week of nights

Tonight · 12 Aug
68
Good
MOON 0%
21:00–22:00
Tomorrow · 13 Aug
81
Excellent
MOON 2%
20:00–02:00
Friday · 14 Aug
89
Excellent
MOON 6%
20:00–02:00
Saturday · 15 Aug
37
Fair
MOON 13%
03:00–04:00
Sunday · 16 Aug
82
Excellent
MOON 21%
03:00–04:00
Monday · 17 Aug
88
Excellent
MOON 30%
03:00–04:00
Tuesday · 18 Aug
22
Poor
MOON 39%
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Nearby locations

About this forecast

Conditions for Khamis Mushait, Saudi Arabia 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 →