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Isahaya

32.841° N   130.043° E  ·  104 M
52 /100
PEAK
Marginal, but there is a 1 hour gap from 04:00.
BEST WINDOW 04:00–05:00 · ASTRO DARK 02:00–05:00 · MOON 0%
Transparency
0.39
Seeing
1.00
Cloud
10%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
06
21
23
52
17
0
BEST WINDOW
Low cloud
0%
2%
0%
0%
0%
Mid cloud
80%
76%
34%
10%
6%
High cloud
0%
0%
0%
0%
0%
Transparency
0.39
0.38
0.38
0.37
0.37
Seeing
1.00
1.00
0.99
1.00
1.00
Moon clear
down
down
down
down
0%
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
02 Poor · 21/100
Starting from
100
Cloud
−72
Transparency
−7
Seeing
−0
Moonlight
−0
Darkness
−0
Score
21
CLOUD 80% LOW 0% MID 80% HIGH 0% SUN -37.1° MOON -36.8° / 0% WIND 2 TEMP 25°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 52

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 05:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 60

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 50

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 38

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 52

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
52
Fair
MOON 0%
04:00–05:00
Tomorrow · 13 Aug
49
Fair
MOON 1%
00:00–02:00
Friday · 14 Aug
30
Poor
MOON 5%
Saturday · 15 Aug
63
Good
MOON 8%
03:00–04:00
Sunday · 16 Aug
37
Fair
MOON 19%
21:00–22:00
Monday · 17 Aug
49
Fair
MOON 28%
03:00–04:00
Tuesday · 18 Aug
14
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Isahaya, 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 how dark the sky actually gets. Read the full method →