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Trinidad

-33.517° S   56.900° W  ·  142 M
57 /100
PEAK
Worth setting up — 1 hour of workable sky from 23:00.
BEST WINDOW 23:00–00:00 · ASTRO DARK 20:00–07:00 · MOON 0%
Transparency
0.44
Seeing
0.68
Cloud
16%
Moon
0%

Good tonight

Hour by hour, local to Trinidad. 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
1
0
5
57
6
7
5
2
3
3
2
0
0
BEST WINDOW
Low cloud
99%
100%
95%
97%
28%
0%
9%
1%
28%
47%
8%
12%
38%
52%
54%
Mid cloud
100%
100%
66%
97%
100%
11%
99%
99%
88%
95%
98%
98%
100%
100%
100%
High cloud
90%
99%
81%
51%
0%
5%
0%
9%
88%
100%
100%
100%
100%
100%
100%
Transparency
0.44
0.44
0.41
0.38
0.37
0.35
0.28
0.32
0.30
0.27
0.27
0.26
0.27
0.27
0.30
Seeing
0.63
0.62
0.51
0.52
0.52
0.48
0.62
0.65
0.68
0.68
0.62
0.60
0.61
0.62
0.55
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 99% MID 100% HIGH 90% SUN 2.4° MOON 5.2° / 0% WIND 6 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 22:30 · OBSERVE 23:00–00:00 · 1H · MEAN 61

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

1820220002040608
CLOUD BREAKS 23:00CLOUD RETURNS 00:00
SET UP 22:30 · OBSERVE 23:00–00:00 · 1H · MEAN 57

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

1820220002040608
CLOUD BREAKS 23:00CLOUD RETURNS 00:00SEEING STAYS SOFT THROUGHOUT
SET UP 22:30 · OBSERVE 23:00–00:00 · 1H · MEAN 59

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

1820220002040608
CLOUD BREAKS 23:00CLOUD RETURNS 00:00
SET UP 22:30 · OBSERVE 23:00–00:00 · 1H · MEAN 47

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

1820220002040608
CLOUD BREAKS 23:00CLOUD RETURNS 00:00
SET UP 22:30 · OBSERVE 23:00–00:00 · 1H · MEAN 67

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

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

Tonight · 12 Aug
57
Good
MOON 0%
23:00–00:00
Tomorrow · 13 Aug
56
Good
MOON 3%
01:00–02:00
Friday · 14 Aug
61
Good
MOON 7%
01:00–04:00
Saturday · 15 Aug
4
Clouded out
MOON 15%
Sunday · 16 Aug
0
Clouded out
MOON 23%
Monday · 17 Aug
0
Clouded out
MOON 32%
Tuesday · 18 Aug
62
Good
MOON 42%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Trinidad, Uruguay 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 →