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Saquarema

-22.899° S   42.470° W  ·  57 M
64 /100
PEAK
Worth setting up — 6 hours of workable sky from 21:00.
BEST WINDOW 21:00–03:00 · ASTRO DARK 19:00–06:00 · MOON 0%
Transparency
0.47
Seeing
0.73
Cloud
4%
Moon
0%

Good tonight

Hour by hour, local to Saquarema. 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
4
37
29
36
62
64
61
51
35
30
35
34
0
BEST WINDOW
Low cloud
32%
5%
2%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
2%
Mid cloud
0%
0%
3%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
High cloud
6%
20%
73%
100%
80%
9%
3%
10%
38%
83%
96%
81%
85%
63%
Transparency
0.56
0.47
0.41
0.39
0.42
0.42
0.40
0.37
0.34
0.30
0.27
0.24
0.21
0.20
Seeing
0.44
0.39
0.39
0.38
0.35
0.41
0.43
0.47
0.52
0.60
0.64
0.66
0.73
0.79
Moon clear
0%
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
17 Clouded out · 0/100
Starting from
100
Cloud
−34
Transparency
−12
Seeing
−8
Moonlight
−0
Darkness
−47
Score
0
CLOUD 35% LOW 32% MID 0% HIGH 6% SUN 6.4° MOON 8.9° / 0% WIND 8 TEMP 22°
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 20:30 · OBSERVE 21:00–02:00 · 5H · MEAN 59

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

17192123010305
HIGH CLOUD CLEARS 21:00CLOUD RETURNS 02:00
SET UP 21:30 · OBSERVE 22:00–03:00 · 5H · MEAN 54

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

17192123010305
HIGH CLOUD CLEARS 22:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 61

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

17192123010305
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 02:00
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 50

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

17192123010305
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 02:00
SET UP 20:30 · OBSERVE 21:00–02:00 · 5H · MEAN 64

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

17192123010305
HIGH CLOUD CLEARS 21:00CLOUD RETURNS 02:00
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The next week of nights

Tonight · 12 Aug
64
Good
MOON 0%
21:00–03:00
Tomorrow · 13 Aug
70
Good
MOON 3%
02:00–06:00
Friday · 14 Aug
55
Good
MOON 7%
19:00–00:00
Saturday · 15 Aug
48
Fair
MOON 15%
03:00–04:00
Sunday · 16 Aug
54
Fair
MOON 23%
03:00–04:00
Monday · 17 Aug
54
Fair
MOON 32%
03:00–04:00
Tuesday · 18 Aug
61
Good
MOON 42%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Saquarema, 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 →