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Cabo Frio

-22.887° S   42.026° W  ·  13 M
61 /100
PEAK
Worth setting up — 4 hours of workable sky from 22:00.
BEST WINDOW 22:00–02:00 · ASTRO DARK 19:00–05:00 · MOON 0%
Transparency
0.48
Seeing
0.36
Cloud
1%
Moon
0%

Good tonight

Hour by hour, local to Cabo Frio. 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
6
45
27
28
57
61
59
54
32
31
35
30
0
BEST WINDOW
Low cloud
18%
6%
6%
9%
6%
1%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
13%
20%
50%
99%
96%
13%
1%
4%
19%
85%
88%
76%
91%
84%
Transparency
0.51
0.46
0.47
0.48
0.47
0.44
0.42
0.40
0.40
0.41
0.39
0.37
0.34
0.32
Seeing
0.42
0.36
0.31
0.24
0.20
0.20
0.18
0.17
0.17
0.19
0.20
0.25
0.31
0.37
Moon clear
0%
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
−24
Transparency
−15
Seeing
−9
Moonlight
−0
Darkness
−52
Score
0
CLOUD 29% LOW 18% MID 0% HIGH 13% SUN 6.1° MOON 8.5° / 0% WIND 8 TEMP 21°
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 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 66

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

17192123010305
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 02:00
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 51

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

17192123010305
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 02:00SEEING STAYS SOFT THROUGHOUT
SET UP 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 64

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 52

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 21:30 · OBSERVE 22:00–02:00 · 4H · MEAN 75

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

17192123010305
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 02:00
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The next week of nights

Tonight · 12 Aug
61
Good
MOON 0%
22:00–02:00
Tomorrow · 13 Aug
66
Good
MOON 3%
03:00–06:00
Friday · 14 Aug
54
Fair
MOON 7%
19:00–22:00
Saturday · 15 Aug
39
Fair
MOON 15%
21:00–22:00
Sunday · 16 Aug
4
Clouded out
MOON 23%
Monday · 17 Aug
56
Good
MOON 32%
03:00–04:00
Tuesday · 18 Aug
61
Good
MOON 42%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Cabo Frio, 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 →