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Kalihi Valley

21.364° N   157.843° W  ·  164 M
46 /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
0.45
Seeing
0.45
Cloud
23%
Moon
1%

Fair tonight

Hour by hour, local to Kalihi Valley. 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
29
36
25
29
33
41
45
46
37
41
0
BEST WINDOW
Low cloud
21%
27%
45%
54%
47%
39%
33%
27%
27%
41%
23%
33%
Mid cloud
0%
1%
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
0.44
0.45
0.45
0.10
0.10
0.10
0.29
0.29
0.32
0.35
0.35
0.32
Seeing
0.40
0.40
0.41
0.34
0.39
0.38
0.43
0.45
0.45
0.43
0.43
0.41
Moon clear
0%
down
down
down
down
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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
−21
Transparency
−18
Seeing
−9
Moonlight
−0
Darkness
−52
Score
0
CLOUD 21% LOW 21% MID 0% HIGH 0% SUN 0.1° MOON 6.3° / 0% WIND 8 TEMP 24°
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 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 44

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

192123010305
TWILIGHT BEGINS 06:00
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 42

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

192123010305
TWILIGHT BEGINS 06:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 44

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

192123010305
TWILIGHT BEGINS 06:00
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 36

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

192123010305
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 46

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
46
Fair
MOON 1%
01:00–05:00
Tomorrow · 13 Aug
50
Fair
MOON 4%
22:00–01:00
Friday · 14 Aug
12
Clouded out
MOON 8%
Saturday · 15 Aug
0
Clouded out
MOON 17%
Sunday · 16 Aug
17
Poor
MOON 25%
Monday · 17 Aug
49
Fair
MOON 35%
02:00–03:00
Tuesday · 18 Aug
47
Fair
MOON 44%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Kalihi Valley, 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 →