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Guaratinga

-16.582° S   39.781° W  ·  154 M
67 /100
PEAK
Worth setting up — 4 hours of workable sky from 01:00.
BEST WINDOW 01:00–05:00 · ASTRO DARK 19:00–05:00 · MOON 0%
Transparency
0.47
Seeing
1.00
Cloud
2%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
17
18
19
20
21
22
23
00
01
02
03
04
05
06
0
0
2
13
30
29
12
21
39
57
64
67
49
0
BEST WINDOW
Low cloud
100%
100%
98%
83%
59%
63%
84%
73%
47%
20%
7%
3%
2%
4%
Mid cloud
1%
0%
2%
2%
2%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.52
0.47
0.46
0.46
0.43
0.40
0.35
0.38
0.35
0.30
0.23
0.22
0.25
0.27
Seeing
0.83
0.86
0.83
0.87
0.94
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
0%
down
down
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
17 Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100% LOW 100% MID 1% HIGH 0% SUN 6.0° MOON 8.6° / 0% WIND 4 TEMP 22°
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
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 54

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

17192123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 72

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

17192123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 51

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

17192123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 45

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

17192123010305
CLOUD BREAKS 02:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 56

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

17192123010305
CLOUD BREAKS 01:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
67
Good
MOON 0%
01:00–05:00
Tomorrow · 13 Aug
79
Excellent
MOON 3%
19:00–05:00
Friday · 14 Aug
76
Excellent
MOON 7%
19:00–03:00
Saturday · 15 Aug
59
Good
MOON 15%
21:00–22:00
Sunday · 16 Aug
26
Poor
MOON 23%
Monday · 17 Aug
9
Clouded out
MOON 32%
Tuesday · 18 Aug
54
Fair
MOON 42%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Guaratinga, Brazil 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 →