GoodSeeing
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Manatí

18.427° N   66.492° W  ·  33 M
58 /100
PEAK
Worth setting up — 8 hours of workable sky from 21:00.
BEST WINDOW 21:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 0%
Transparency
0.26
Seeing
0.77
Cloud
9%
Moon
0%

Good tonight

Hour by hour, local to Manatí. 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
41
48
53
56
58
51
40
40
37
34
0
BEST WINDOW
Low cloud
2%
0%
2%
4%
5%
2%
5%
8%
4%
9%
14%
16%
Mid cloud
3%
4%
6%
5%
5%
4%
4%
7%
5%
9%
7%
7%
High cloud
47%
29%
36%
21%
6%
3%
21%
51%
59%
57%
38%
84%
Transparency
0.29
0.26
0.24
0.23
0.23
0.22
0.23
0.24
0.24
0.24
0.23
0.22
Seeing
0.66
0.67
0.71
0.74
0.69
0.64
0.65
0.69
0.70
0.70
0.77
0.69
Moon clear
0%
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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
−30
Transparency
−20
Seeing
−4
Moonlight
−0
Darkness
−46
Score
0
CLOUD 50% LOW 2% MID 3% HIGH 47% SUN -1.9° MOON 2.3° / 0% WIND 5 TEMP 26°
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
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

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 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 48

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

192123010305
HIGH CLOUD CLEARS 20:00TWILIGHT BEGINS 05:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 53

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

192123010305
HIGH CLOUD CLEARS 20:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 19:30 · OBSERVE 20:00–02:00 · 6H · MEAN 48

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

192123010305
HIGH CLOUD CLEARS 20:00CLOUD RETURNS 02:00
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 41

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

192123010305
CLOUD RETURNS 02:00
SET UP 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 50

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

192123010305
HIGH CLOUD CLEARS 20:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
58
Good
MOON 0%
21:00–05:00
Tomorrow · 13 Aug
60
Good
MOON 3%
00:00–05:00
Friday · 14 Aug
62
Good
MOON 7%
22:00–03:00
Saturday · 15 Aug
49
Fair
MOON 15%
02:00–03:00
Sunday · 16 Aug
17
Poor
MOON 23%
Monday · 17 Aug
56
Good
MOON 32%
02:00–03:00
Tuesday · 18 Aug
63
Good
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Manatí, Puerto Rico 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 →