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Aliamanu / Salt Lakes / Foster Village

21.360° N   157.918° W  ·  31 M
50 /100
PEAK
Marginal, but there is a 4 hours gap from 01:00.
BEST WINDOW 01:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 1%
Transparency
0.43
Seeing
0.66
Cloud
21%
Moon
1%

Fair tonight

Hour by hour, local to Aliamanu / Salt Lakes / Foster Village. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
0
32
50
36
30
29
36
39
37
44
39
0
BEST WINDOW
Low cloud
22%
20%
28%
37%
48%
50%
43%
36%
40%
31%
27%
33%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.45
0.42
0.43
0.10
0.10
0.10
0.24
0.23
0.23
0.27
0.28
0.24
Seeing
0.55
0.59
0.61
0.59
0.62
0.62
0.65
0.66
0.65
0.63
0.64
0.62
Moon clear
0%
down
down
down
down
down
down
down
down
down
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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
19 Clouded out · 0/100
Starting from
100
Cloud
−22
Transparency
−17
Seeing
−7
Moonlight
−0
Darkness
−54
Score
0
CLOUD 22% LOW 22% MID 0% HIGH 0% SUN 0.2° MOON 6.4° / 0% WIND 7 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 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 40

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

192123010305
TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 44

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

192123010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 39

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

192123010305
TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 39

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

192123010305
ASTRONOMICAL DARK FROM 21:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 41

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

192123010305
TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
50
Fair
MOON 1%
01:00–05:00
Tomorrow · 13 Aug
52
Fair
MOON 4%
22:00–02:00
Friday · 14 Aug
0
Clouded out
MOON 8%
Saturday · 15 Aug
0
Clouded out
MOON 17%
Sunday · 16 Aug
7
Clouded out
MOON 25%
Monday · 17 Aug
39
Fair
MOON 35%
02:00–03:00
Tuesday · 18 Aug
53
Fair
MOON 44%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Aliamanu / Salt Lakes / Foster Village, Hawaii, 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 how dark the sky actually gets. Read the full method →