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São Vicente Férrer

-7.591° S   35.491° W  ·  416 M
55 /100
PEAK
Worth setting up — 5 hours of workable sky from 19:00.
BEST WINDOW 19:00–00:00 · ASTRO DARK 19:00–05:00 · MOON 0%
Transparency
0.41
Seeing
0.89
Cloud
9%
Moon
0%

Good tonight

Hour by hour, local to São Vicente Férrer. 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
18
55
46
46
42
38
16
10
3
5
23
11
0
BEST WINDOW
Low cloud
25%
17%
19%
29%
28%
34%
41%
74%
84%
89%
76%
47%
9%
13%
Mid cloud
2%
2%
1%
1%
1%
1%
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
0.47
0.41
0.31
0.24
0.21
0.19
0.18
0.17
0.16
0.16
0.16
0.17
0.18
0.19
Seeing
0.70
0.74
0.76
0.79
0.80
0.81
0.79
0.76
0.76
0.77
0.80
0.84
0.89
0.90
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
17 Clouded out · 0/100
Starting from
100
Cloud
−27
Transparency
−16
Seeing
−4
Moonlight
−0
Darkness
−53
Score
0
CLOUD 27% LOW 25% MID 2% HIGH 0% SUN 4.6° MOON 7.4° / 0% WIND 5 TEMP 23°
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 18:30 · OBSERVE 19:00–00:00 · 5H · MEAN 47

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 00:00
SET UP 17:30 · OBSERVE 18:00–00:00 · 6H · MEAN 52

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

17192123010305
CLOUD RETURNS 00:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–00:00 · 5H · MEAN 44

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 00:00
SET UP 18:30 · OBSERVE 19:00–20:00 · 1H · MEAN 43

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

17192123010305
ASTRONOMICAL DARK FROM 19:00
SET UP 18:30 · OBSERVE 19:00–00:00 · 5H · MEAN 48

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 00:00
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The next week of nights

Tonight · 12 Aug
55
Good
MOON 0%
19:00–00:00
Tomorrow · 13 Aug
72
Good
MOON 3%
19:00–05:00
Friday · 14 Aug
68
Good
MOON 7%
19:00–04:00
Saturday · 15 Aug
67
Good
MOON 15%
21:00–22:00
Sunday · 16 Aug
49
Fair
MOON 23%
21:00–22:00
Monday · 17 Aug
59
Good
MOON 32%
03:00–04:00
Tuesday · 18 Aug
15
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for São Vicente Férrer, 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 →