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Santa Elena de Uairén

4.602° N   61.110° W  ·  868 M
66 /100
PEAK
Worth setting up — 8 hours of workable sky from 21:00.
BEST WINDOW 21:00–05:00 · ASTRO DARK 20:00–05:00 · MOON 0%
Transparency
0.43
Seeing
1.00
Cloud
2%
Moon
0%

Good tonight

Hour by hour, local to Santa Elena de Uairén. 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
16
31
36
38
48
49
54
52
58
66
55
0
BEST WINDOW
Low cloud
17%
9%
2%
9%
24%
22%
20%
6%
1%
0%
0%
0%
0%
Mid cloud
30%
18%
7%
9%
8%
3%
4%
3%
2%
9%
2%
2%
2%
High cloud
0%
60%
100%
80%
50%
26%
28%
41%
48%
23%
8%
0%
0%
Transparency
0.51
0.43
0.40
0.41
0.37
0.35
0.38
0.40
0.34
0.30
0.27
0.24
0.23
Seeing
0.93
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
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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
−39
Transparency
−12
Seeing
−1
Moonlight
−0
Darkness
−48
Score
0
CLOUD 33% LOW 17% MID 30% HIGH 0% SUN 3.5° MOON 7.4° / 0% WIND 3 TEMP 24°
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
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 51

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

18202200020406
HIGH CLOUD CLEARS 22:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 61

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

18202200020406
HIGH CLOUD CLEARS 21:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 47

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

18202200020406
HIGH CLOUD CLEARS 23:00TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 44

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

18202200020406
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 06:00
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 53

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

18202200020406
HIGH CLOUD CLEARS 23:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
66
Good
MOON 0%
21:00–05:00
Tomorrow · 13 Aug
37
Fair
MOON 3%
20:00–21:00
Friday · 14 Aug
48
Fair
MOON 7%
21:00–23:00
Saturday · 15 Aug
52
Fair
MOON 15%
02:00–03:00
Sunday · 16 Aug
38
Fair
MOON 23%
20:00–21:00
Monday · 17 Aug
48
Fair
MOON 32%
02:00–03:00
Tuesday · 18 Aug
40
Fair
MOON 42%
20:00–21:00
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Nearby locations

About this forecast

Conditions for Santa Elena de Uairén, Venezuela 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 →