GoodSeeing
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Siavonga

-16.538° S   28.709° E  ·  528 M
67 /100
PEAK
Worth setting up — 3 hours of workable sky from 23:00.
BEST WINDOW 23:00–02:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.72
Seeing
0.92
Cloud
20%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
07
56
67
39
30
37
43
45
11
1
32
33
1
0
BEST WINDOW
Low cloud
1%
5%
20%
15%
23%
15%
19%
79%
97%
20%
32%
66%
98%
Mid cloud
20%
17%
29%
48%
31%
27%
19%
26%
62%
45%
32%
31%
99%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.64
0.72
0.55
0.45
0.46
0.48
0.50
0.54
0.57
0.58
0.57
0.56
0.56
Seeing
0.92
0.72
0.20
0.19
0.36
0.40
0.31
0.19
0.18
0.24
0.27
0.26
0.33
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
0%
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
19 Good · 56/100
Starting from
100
Cloud
−18
Transparency
−12
Seeing
−1
Moonlight
−0
Darkness
−13
Score
56
CLOUD 20% LOW 1% MID 20% HIGH 0% SUN -15.8° MOON -14.9° / 0% WIND 3 TEMP 25°
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 18:30 · OBSERVE 19:00–02:00 · 7H · MEAN 48

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

19212301030507
CLOUD RETURNS 02:00
SET UP 18:30 · OBSERVE 19:00–21:00 · 2H · MEAN 68

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

19212301030507
SEEING DEGRADES AFTER 21:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 56

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

19212301030507
CLOUD RETURNS 22:00
SET UP 18:30 · OBSERVE 19:00–21:00 · 2H · MEAN 52

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

19212301030507
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.

19212301030507
CLOUD RETURNS 22:00
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The next week of nights

Tonight · 12 Aug
67
Good
MOON 0%
23:00–02:00
Tomorrow · 13 Aug
51
Fair
MOON 2%
00:00–05:00
Friday · 14 Aug
81
Excellent
MOON 6%
20:00–00:00
Saturday · 15 Aug
73
Good
MOON 13%
20:00–21:00
Sunday · 16 Aug
90
Excellent
MOON 21%
02:00–03:00
Monday · 17 Aug
87
Excellent
MOON 30%
02:00–03:00
Tuesday · 18 Aug
93
Excellent
MOON 39%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Siavonga, Zambia 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 →