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Sarandí

-34.682° S   58.346° W  ·  10 M
42 /100
PEAK
Marginal, but there is a 2 hours gap from 21:00.
BEST WINDOW 21:00–23:00 · ASTRO DARK 20:00–07:00 · MOON 0%
Transparency
0.52
Seeing
0.55
Cloud
41%
Moon
0%

Fair tonight

Hour by hour, local to Sarandí. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
05
06
07
08
0
0
16
41
42
20
5
8
6
8
12
4
5
1
0
BEST WINDOW
Low cloud
100%
100%
66%
16%
33%
69%
91%
85%
87%
71%
70%
91%
83%
83%
84%
Mid cloud
0%
0%
0%
3%
0%
0%
0%
0%
4%
26%
6%
1%
11%
26%
53%
High cloud
18%
18%
52%
45%
13%
2%
5%
31%
65%
85%
71%
55%
91%
95%
99%
Transparency
0.56
0.52
0.52
0.49
0.45
0.42
0.42
0.43
0.43
0.44
0.44
0.47
0.46
0.41
0.39
Seeing
0.35
0.27
0.30
0.39
0.40
0.38
0.40
0.46
0.47
0.49
0.53
0.55
0.51
0.52
0.54
Moon clear
0%
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
18 Clouded out · 0/100
Starting from
100
Cloud
−100
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−0
Score
0
CLOUD 100% LOW 100% MID 0% HIGH 18% SUN 3.2° MOON 5.8° / 0% WIND 9 TEMP 11°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 21:00–23:00 · 2H · MEAN 45

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

1820220002040608
CLOUD BREAKS 21:00CLOUD RETURNS 23:00
SET UP 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 39

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

1820220002040608
CLOUD BREAKS 21:00CLOUD RETURNS 23:00SEEING STAYS SOFT THROUGHOUT
SET UP 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 41

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

1820220002040608
CLOUD BREAKS 21:00CLOUD RETURNS 23:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

1820220002040608
CLOUD NEVER DROPS BELOW 41%
SET UP 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 45

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

1820220002040608
CLOUD BREAKS 21:00CLOUD RETURNS 23:00
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The next week of nights

Tonight · 12 Aug
42
Fair
MOON 0%
21:00–23:00
Tomorrow · 13 Aug
62
Good
MOON 3%
01:00–07:00
Friday · 14 Aug
10
Clouded out
MOON 7%
Saturday · 15 Aug
38
Fair
MOON 15%
21:00–22:00
Sunday · 16 Aug
38
Fair
MOON 23%
21:00–22:00
Monday · 17 Aug
0
Clouded out
MOON 32%
Tuesday · 18 Aug
72
Good
MOON 42%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Sarandí, 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 →