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Quezaltepeque

13.831° N   89.272° W  ·  443 M
73 /100
PEAK
Worth setting up — 9 hours of workable sky from 20:00.
BEST WINDOW 20:00–05:00 · ASTRO DARK 20:00–05:00 · MOON 1%
Transparency
0.34
Seeing
1.00
Cloud
0%
Moon
1%

Good tonight

Hour by hour, local to Quezaltepeque. 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
8
54
48
45
57
59
69
71
72
73
30
0
BEST WINDOW
Low cloud
8%
8%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
37%
30%
0%
0%
0%
2%
2%
1%
0%
0%
0%
0%
0%
High cloud
72%
79%
27%
55%
66%
38%
33%
4%
1%
0%
0%
0%
0%
Transparency
0.31
0.10
0.10
0.21
0.26
0.34
0.34
0.29
0.28
0.30
0.32
0.31
0.29
Seeing
0.82
0.83
0.98
1.00
1.00
1.00
1.00
0.98
0.99
1.00
1.00
1.00
1.00
Moon clear
0%
down
down
down
down
down
down
down
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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
18 Clouded out · 0/100
Starting from
100
Cloud
−63
Transparency
−10
Seeing
−1
Moonlight
−0
Darkness
−26
Score
0
CLOUD 82% LOW 8% MID 37% HIGH 72% SUN 4.1° MOON 8.7° / 0% WIND 4 TEMP 29°
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 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 60

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

18202200020406
HIGH CLOUD CLEARS 20:00TWILIGHT BEGINS 05:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 73

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

18202200020406
HIGH CLOUD CLEARS 20:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 61

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

18202200020406
HIGH CLOUD CLEARS 23:00TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 52

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

18202200020406
HIGH CLOUD CLEARS 23:00TWILIGHT BEGINS 05:00
SET UP 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 62

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

18202200020406
HIGH CLOUD CLEARS 20:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
73
Good
MOON 0%
20:00–05:00
Tomorrow · 13 Aug
76
Excellent
MOON 3%
20:00–05:00
Friday · 14 Aug
81
Excellent
MOON 7%
20:00–01:00
Saturday · 15 Aug
35
Fair
MOON 15%
00:00–01:00
Sunday · 16 Aug
42
Fair
MOON 23%
00:00–01:00
Monday · 17 Aug
43
Fair
MOON 32%
00:00–01:00
Tuesday · 18 Aug
16
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Quezaltepeque, El Salvador 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 →