GoodSeeing
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Andahuaylas

-13.656° S   73.387° W  ·  2902 M
62 /100
PEAK
Worth setting up — 3 hours of workable sky from 19:00.
BEST WINDOW 19:00–22:00 · ASTRO DARK 20:00–05:00 · MOON 1%
Transparency
0.40
Seeing
1.00
Cloud
16%
Moon
1%

Good tonight

Hour by hour, local to Andahuaylas. 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
0
62
60
43
21
9
9
15
0
0
20
28
0
BEST WINDOW
Low cloud
17%
16%
16%
28%
52%
73%
71%
60%
98%
98%
51%
39%
30%
Mid cloud
25%
2%
1%
0%
2%
2%
2%
2%
1%
0%
0%
0%
0%
High cloud
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.15
0.40
0.33
0.25
0.22
0.21
0.18
0.17
0.15
0.15
0.19
0.24
0.29
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
0%
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
−36
Transparency
−22
Seeing
−0
Moonlight
−0
Darkness
−42
Score
0
CLOUD 37% LOW 17% MID 25% HIGH 1% SUN -3.7° MOON 0.9° / 0% WIND 1 TEMP 12°
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 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 55

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

18202200020406
CLOUD BREAKS 19:00CLOUD RETURNS 22:00
SET UP 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 67

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

18202200020406
CLOUD BREAKS 19:00CLOUD RETURNS 22:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 52

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

18202200020406
CLOUD BREAKS 19:00CLOUD RETURNS 22:00
SET UP 18:30 · OBSERVE 19:00–21:00 · 2H · MEAN 48

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

18202200020406
CLOUD BREAKS 19:00
SET UP 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 56

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

18202200020406
CLOUD BREAKS 19:00CLOUD RETURNS 22:00
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The next week of nights

Tonight · 12 Aug
62
Good
MOON 0%
19:00–22:00
Tomorrow · 13 Aug
77
Excellent
MOON 3%
19:00–00:00
Friday · 14 Aug
72
Good
MOON 7%
19:00–22:00
Saturday · 15 Aug
82
Excellent
MOON 15%
19:00–20:00
Sunday · 16 Aug
53
Fair
MOON 23%
19:00–20:00
Monday · 17 Aug
27
Poor
MOON 32%
Tuesday · 18 Aug
34
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Andahuaylas, Peru 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 →