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Semi

6.367° N   2.617° E  ·  8 M
35 /100
PEAK
Marginal, but there is a 1 hour gap from 21:00.
BEST WINDOW 21:00–22:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.35
Seeing
0.76
Cloud
43%
Moon
0%

Fair tonight

Hour by hour, local to Semi. 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
0
27
35
33
32
25
24
17
17
13
8
3
0
BEST WINDOW
Low cloud
31%
31%
36%
41%
16%
25%
36%
42%
41%
53%
75%
86%
98%
Mid cloud
0%
1%
1%
2%
2%
2%
4%
10%
13%
12%
21%
23%
75%
High cloud
15%
17%
28%
23%
72%
87%
74%
95%
92%
97%
78%
16%
40%
Transparency
0.37
0.35
0.34
0.33
0.32
0.32
0.31
0.31
0.29
0.28
0.27
0.27
0.27
Seeing
0.51
0.53
0.54
0.57
0.56
0.56
0.60
0.64
0.66
0.69
0.73
0.76
0.82
Moon clear
0%
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
19 Clouded out · 0/100
Starting from
100
Cloud
−37
Transparency
−16
Seeing
−6
Moonlight
−0
Darkness
−42
Score
0
CLOUD 41% LOW 31% MID 0% HIGH 15% SUN 0.4° MOON 2.5° / 0% WIND 7 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 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 36

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

19212301030507
ASTRONOMICAL DARK FROM 21:00CLOUD RETURNS 23:00
SET UP 19:30 · OBSERVE 20:00–23:00 · 3H · MEAN 36

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

19212301030507
CLOUD RETURNS 23:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 41%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 41%
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 36

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

19212301030507
ASTRONOMICAL DARK FROM 21:00
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The next week of nights

Tonight · 12 Aug
35
Fair
MOON 0%
21:00–22:00
Tomorrow · 13 Aug
28
Poor
MOON 2%
Friday · 14 Aug
44
Fair
MOON 6%
22:00–23:00
Saturday · 15 Aug
30
Poor
MOON 13%
Sunday · 16 Aug
28
Poor
MOON 21%
Monday · 17 Aug
23
Poor
MOON 30%
Tuesday · 18 Aug
8
Clouded out
MOON 39%
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Nearby locations

About this forecast

Conditions for Semi, Benin 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 →