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São Lourenço

22.189° N   113.535° E  ·  1 M
48 /100
PEAK
Marginal, but there is a 5 hours gap from 00:00.
BEST WINDOW 00:00–05:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.39
Seeing
0.47
Cloud
38%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
42
44
47
44
48
35
0
BEST WINDOW
Low cloud
0%
4%
6%
0%
0%
0%
0%
Mid cloud
1%
0%
0%
8%
8%
2%
3%
High cloud
62%
50%
41%
49%
35%
36%
32%
Transparency
0.34
0.35
0.39
0.38
0.38
0.36
0.35
Seeing
0.47
0.46
0.41
0.44
0.41
0.45
0.52
Moon clear
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
00 Fair · 42/100
Starting from
100
Cloud
−34
Transparency
−17
Seeing
−6
Moonlight
−0
Darkness
−0
Score
42
CLOUD 62% LOW 0% MID 1% HIGH 62% SUN -52.1° MOON -50.8° / 0% WIND 7 TEMP 30°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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 23:30 · OBSERVE 00:00–05:00 · 5H · MEAN 47

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

00020406
TWILIGHT BEGINS 05:00
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 44

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

00020406
TWILIGHT BEGINS 06:00SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–05:00 · 5H · MEAN 41

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

00020406
TWILIGHT BEGINS 05:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 47

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

00020406
TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
48
Fair
MOON 0%
00:00–05:00
Tomorrow · 13 Aug
29
Poor
MOON 1%
Friday · 14 Aug
49
Fair
MOON 5%
23:00–01:00
Saturday · 15 Aug
43
Fair
MOON 10%
02:00–03:00
Sunday · 16 Aug
26
Poor
MOON 19%
Monday · 17 Aug
15
Poor
MOON 28%
Tuesday · 18 Aug
11
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for São Lourenço, China 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 →