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Olympia

47.045° N   122.902° W  ·  8 M
67 /100
PEAK
Worth setting up — 6 hours of workable sky from 23:00.
BEST WINDOW 23:00–05:00 · ASTRO DARK 23:00–05:00 · MOON 1%
Transparency
0.39
Seeing
0.99
Cloud
1%
Moon
1%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
0
49
67
65
61
51
41
35
7
0
BEST WINDOW
Low cloud
1%
0%
4%
5%
7%
17%
34%
44%
70%
77%
Mid cloud
1%
0%
1%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.48
0.39
0.31
0.25
0.22
0.20
0.19
0.18
0.17
0.17
Seeing
0.88
0.88
0.92
0.99
0.98
0.99
0.99
0.98
0.99
1.00
Moon clear
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
21 Clouded out · 0/100
Starting from
100
Cloud
−2
Transparency
−21
Seeing
−2
Moonlight
−0
Darkness
−76
Score
0
CLOUD 2% LOW 1% MID 1% HIGH 0% SUN -5.7° MOON -2.0° / 0% WIND 3 TEMP 19°
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
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 21:30 · OBSERVE 22:00–05:00 · 7H · MEAN 52

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

2123010305
CLOUD RETURNS 05:00
SET UP 21:30 · OBSERVE 22:00–05:00 · 7H · MEAN 67

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

2123010305
CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–04:00 · 6H · MEAN 52

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

2123010305
SET UP 21:30 · OBSERVE 22:00–03:00 · 5H · MEAN 45

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

2123010305
CLOUD RETURNS 03:00
SET UP 21:30 · OBSERVE 22:00–04:00 · 6H · MEAN 57

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

2123010305
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The next week of nights

Tonight · 12 Aug
67
Good
MOON 1%
23:00–05:00
Tomorrow · 13 Aug
66
Good
MOON 3%
23:00–04:00
Friday · 14 Aug
70
Good
MOON 7%
23:00–00:00
Saturday · 15 Aug
73
Good
MOON 17%
23:00–00:00
Sunday · 16 Aug
46
Fair
MOON 25%
23:00–00:00
Monday · 17 Aug
7
Clouded out
MOON 35%
Tuesday · 18 Aug
68
Good
MOON 44%
23:00–00:00
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Nearby locations

About this forecast

Conditions for Olympia, Washington, United States 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 →