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Punta Arenas

-53.163° S   70.909° W
36 /100
PEAK
Marginal, but there is a 1 hour gap from 21:00.
BEST WINDOW 21:00–22:00 · ASTRO DARK 21:00–08:00 · MOON 0%
Transparency
0.22
Seeing
1.00
Cloud
43%
Moon
0%

Fair tonight

Hour by hour, local to Punta Arenas. 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
07
08
09
0
16
36
33
5
0
0
0
0
0
0
0
0
0
0
BEST WINDOW
Low cloud
71%
57%
44%
43%
73%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
Mid cloud
0%
0%
0%
0%
0%
0%
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%
0%
Transparency
0.19
0.21
0.22
0.20
0.18
0.18
0.16
0.17
0.19
0.16
0.16
0.16
0.16
0.16
0.17
Seeing
1.00
1.00
1.00
1.00
1.00
0.99
1.00
1.00
0.99
0.97
0.93
0.94
0.90
0.82
0.79
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
down
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
−77
Transparency
−7
Seeing
−0
Moonlight
−0
Darkness
−15
Score
0
CLOUD 71% LOW 71% MID 0% HIGH 0% SUN -4.8° MOON -1.8° / 0% WIND 2 TEMP 3°
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 21:00–22:00 · 1H · MEAN 36

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

1921230103050709
ASTRONOMICAL DARK FROM 21:00
SET UP 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 44

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

1921230103050709
ASTRONOMICAL DARK FROM 21:00CLOUD RETURNS 23:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

1921230103050709
CLOUD NEVER DROPS BELOW 43%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

1921230103050709
CLOUD NEVER DROPS BELOW 43%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

1921230103050709
CLOUD NEVER DROPS BELOW 43%
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The next week of nights

Tonight · 12 Aug
36
Fair
MOON 0%
21:00–22:00
Tomorrow · 13 Aug
9
Clouded out
MOON 3%
Friday · 14 Aug
4
Clouded out
MOON 7%
Saturday · 15 Aug
66
Good
MOON 15%
03:00–04:00
Sunday · 16 Aug
15
Poor
MOON 23%
Monday · 17 Aug
9
Clouded out
MOON 32%
Tuesday · 18 Aug
43
Fair
MOON 42%
03:00–04:00
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About this forecast

Conditions for Punta Arenas, Chile 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 →