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Termas de Río Hondo

-27.494° S   64.860° W  ·  260 M
74 /100
PEAK
Worth setting up — 10 hours of workable sky from 21:00.
BEST WINDOW 21:00–07:00 · ASTRO DARK 21:00–07:00 · MOON 0%
Transparency
0.62
Seeing
1.00
Cloud
3%
Moon
0%

Good tonight

Hour by hour, local to Termas de Río Hondo. 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
0
24
37
74
68
69
69
67
70
72
70
49
21
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
4%
25%
35%
80%
Mid cloud
1%
27%
33%
0%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
48%
70%
48%
17%
20%
6%
4%
10%
6%
3%
2%
20%
21%
21%
Transparency
0.83
0.36
0.34
0.62
0.52
0.36
0.30
0.31
0.33
0.34
0.34
0.32
0.30
0.26
Seeing
0.98
0.90
0.82
0.84
0.81
0.81
0.90
0.90
0.97
1.00
1.00
0.98
0.95
0.96
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
19 Clouded out · 0/100
Starting from
100
Cloud
−27
Transparency
−5
Seeing
−0
Moonlight
−0
Darkness
−68
Score
0
CLOUD 48% LOW 0% MID 1% HIGH 48% SUN -1.5° MOON 2.1° / 0% WIND 2 TEMP 16°
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 20:30 · OBSERVE 21:00–07:00 · 10H · MEAN 65

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

19212301030507
HIGH CLOUD CLEARS 21:00TWILIGHT BEGINS 07:00
SET UP 19:30 · OBSERVE 20:00–08:00 · 12H · MEAN 68

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

19212301030507
CLOUD RETURNS 08:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–07:00 · 9H · MEAN 63

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

19212301030507
HIGH CLOUD CLEARS 22:00TWILIGHT BEGINS 07:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 57

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

19212301030507
HIGH CLOUD CLEARS 22:00CLOUD RETURNS 06:00
SET UP 21:30 · OBSERVE 22:00–07:00 · 9H · MEAN 71

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

19212301030507
HIGH CLOUD CLEARS 22:00TWILIGHT BEGINS 07:00
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The next week of nights

Tonight · 12 Aug
74
Good
MOON 0%
21:00–07:00
Tomorrow · 13 Aug
71
Good
MOON 3%
21:00–05:00
Friday · 14 Aug
41
Fair
MOON 7%
21:00–22:00
Saturday · 15 Aug
1
Clouded out
MOON 15%
Sunday · 16 Aug
5
Clouded out
MOON 23%
Monday · 17 Aug
5
Clouded out
MOON 32%
Tuesday · 18 Aug
22
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Termas de Río Hondo, Argentina 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 →