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Mumias

0.335° N   34.488° E  ·  1321 M
57 /100
PEAK
Worth setting up — 7 hours of workable sky from 20:00.
BEST WINDOW 20:00–03:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.75
Seeing
1.00
Cloud
50%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
07
50
57
51
57
45
47
42
29
37
5
12
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
9%
0%
16%
0%
0%
Mid cloud
13%
5%
3%
4%
10%
2%
13%
36%
33%
98%
63%
9%
High cloud
59%
54%
67%
52%
70%
70%
70%
48%
25%
9%
2%
3%
Transparency
0.75
0.64
0.59
0.56
0.53
0.49
0.43
0.12
0.10
0.10
0.10
0.24
Seeing
0.90
0.98
1.00
1.00
0.98
0.94
1.00
1.00
0.77
0.63
0.88
0.83
Moon clear
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
20 Fair · 50/100
Starting from
100
Cloud
−40
Transparency
−6
Seeing
−1
Moonlight
−0
Darkness
−3
Score
50
CLOUD 64% LOW 0% MID 13% HIGH 59% SUN -17.4° MOON -16.2° / 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 19:30 · OBSERVE 20:00–03:00 · 7H · MEAN 47

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

202200020406
SET UP 19:30 · OBSERVE 20:00–05:00 · 9H · MEAN 50

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

202200020406
CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 19:30 · OBSERVE 20:00–00:00 · 4H · MEAN 44

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

202200020406
CLOUD RETURNS 00:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 36

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

202200020406
SET UP 19:30 · OBSERVE 20:00–03:00 · 7H · MEAN 43

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

202200020406
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The next week of nights

Tonight · 12 Aug
57
Good
MOON 0%
20:00–03:00
Tomorrow · 13 Aug
64
Good
MOON 2%
20:00–03:00
Friday · 14 Aug
46
Fair
MOON 6%
21:00–23:00
Saturday · 15 Aug
64
Good
MOON 13%
21:00–22:00
Sunday · 16 Aug
63
Good
MOON 21%
21:00–22:00
Monday · 17 Aug
65
Good
MOON 30%
03:00–04:00
Tuesday · 18 Aug
51
Fair
MOON 39%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Mumias, Kenya 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 →