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Alameda

37.771° N   122.261° W  ·  11 M
26 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 22:00–05:00 · MOON 1%
Transparency
0.32
Seeing
0.73
Cloud
61%
Moon
1%

Poor tonight

Hour by hour, local to Alameda. 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
0
9
26
9
0
0
0
0
0
0
0
Low cloud
48%
63%
60%
85%
100%
100%
100%
100%
100%
100%
100%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
13%
2%
3%
6%
20%
40%
59%
56%
70%
14%
0%
Transparency
0.37
0.32
0.30
0.29
0.28
0.28
0.28
0.29
0.29
0.30
0.30
Seeing
0.72
0.73
0.71
0.69
0.67
0.69
0.70
0.70
0.67
0.66
0.64
Moon clear
0%
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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 Clouded out · 0/100
Starting from
100
Cloud
−52
Transparency
−12
Seeing
−3
Moonlight
−0
Darkness
−34
Score
0
CLOUD 53% LOW 48% MID 0% HIGH 13% SUN 0.3° MOON 4.6° / 0% WIND 5 TEMP 16°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 53%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 53%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 53%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 53%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 53%
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The next week of nights

Tonight · 12 Aug
26
Poor
MOON 1%
Tomorrow · 13 Aug
0
Clouded out
MOON 3%
Friday · 14 Aug
9
Clouded out
MOON 7%
Saturday · 15 Aug
0
Clouded out
MOON 17%
Sunday · 16 Aug
9
Clouded out
MOON 25%
Monday · 17 Aug
44
Fair
MOON 35%
05:00–06:00
Tuesday · 18 Aug
0
Clouded out
MOON 44%
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Nearby locations

About this forecast

Conditions for Alameda, California, 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 →