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Kaset Sombun

16.280° N   101.954° E  ·  234 M
57 /100
PEAK
Worth setting up — 3 hours of workable sky from 00:00.
BEST WINDOW 00:00–03:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.41
Seeing
0.76
Cloud
27%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
57
37
35
13
9
11
0
BEST WINDOW
Low cloud
2%
4%
5%
5%
2%
5%
2%
Mid cloud
8%
13%
15%
73%
82%
52%
89%
High cloud
19%
67%
69%
82%
88%
96%
81%
Transparency
0.36
0.34
0.36
0.37
0.39
0.41
0.38
Seeing
0.73
0.72
0.71
0.73
0.76
0.76
0.83
Moon clear
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
00 Good · 57/100
Starting from
100
Cloud
−19
Transparency
−21
Seeing
−4
Moonlight
−0
Darkness
−0
Score
57
CLOUD 27% LOW 2% MID 8% HIGH 19% SUN -58.5° MOON -57.3° / 0% WIND 5 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 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 43

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

00020406
CLOUD RETURNS 03:00
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 45

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

00020406
CLOUD RETURNS 03:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 53

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

00020406
CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 42

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

00020406
CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 60

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

00020406
CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
57
Good
MOON 0%
00:00–03:00
Tomorrow · 13 Aug
35
Fair
MOON 1%
20:00–21:00
Friday · 14 Aug
30
Poor
MOON 5%
Saturday · 15 Aug
9
Clouded out
MOON 10%
Sunday · 16 Aug
3
Clouded out
MOON 19%
Monday · 17 Aug
18
Poor
MOON 28%
Tuesday · 18 Aug
14
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Kaset Sombun, Thailand 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 →