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Tonight · Sat, 10 October 2026

Fond du Lac stargazing forecast tonight

Hourly clear-sky conditions for observing: cloud by layer, transparency, estimated seeing, moonlight and true astronomical darkness.

43.775°N 88.439°W ·234 m ·Wisconsin, United States

NearbyOshkoshBeaver DamAppletonManitowocMore nearby
71
/100
Good conditions
at peak

Worth setting up — 10 hours of workable sky from 20:00.

Site darkness · peer measure
Bright skyNot multiplied into the conditions score
19.4–20.1 mag/arcsec²

The score describes tonight’s conditions. Site darkness helps you choose what to observe.

See target outlook ↓Planet observing times →
Best months at Fond du Lac, Wisconsin →Moonless nights →
Tonight in context · local sky & season

October historically: 6.7 qualifying nights/month on average (2005–2024). Regional cloud and darkness history, not tonight’s probability or a comparison with the conditions score.

A qualifying historical night has at least 3 hours of astronomical darkness and mean nighttime cloud ≤30%. This does not measure steady air or target visibility. Seasonal history →

Saturn: about 8.3h above 20° during this observing night’s darkness. Longest sampled dark-time opportunity among our four planet targets; not a weather ranking. Planet times →

Position calculations use roughly 20-minute samples. Clouds, skyglow and local obstructions still matter. Milky Way timing →

Best window
20:00 – 06:00
Window quality
63 / 100 avg
Astronomical dark
20:00 – 06:00
Moon
New moon, 1%
Transparency at peak
0.43
Seeing at peak (est.)
0.68
Visual limit (modelled)
4.0–5.5 mag
Tonight's limiting factor
Transparency

Transparency 0.43 — haze and water vapour will cost you the faintest targets. What this means →

The night, hour by hour

Colour = score · Luminance = everything else
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
12
62
51
60
61
54
64
69
70
71
71
36
Score
BEST WINDOW · 11 H
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
7%
8%
27%
56%
34%
26%
44%
22%
9%
0%
0%
0%
0%
0%
Transparency
0.65
0.60
0.58
0.63
0.63
0.52
0.49
0.51
0.50
0.45
0.43
0.42
0.39
0.36
Seeing
0.49
0.48
0.49
0.47
0.48
0.50
0.54
0.60
0.61
0.60
0.68
0.72
0.74
0.74
Moon clear
0%
down
down
down
down
down
down
down
down
down
down
down
down
down
18
19
20
21
22
23
00
01
02
03
04
05
06
07
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Score inspectorWhy this hour scored what it did Open peakClose
04 Good · 71/100
Starting from
100
Cloud
−0
Transparency
−23
Seeing
−6
Moonlight
−0
Darkness
−0
Score
71
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -33.1° MOON -44.1° / 1% WIND 5 TEMP 15°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What can you actually do tonight?

This is GoodSeeing’s decision layer: the same forecast is weighted for your target and site darkness. Planetary work barely cares about moonlight; long exposures can fail on high cloud a visual observer would barely notice. Your choice is remembered on this device and becomes the default for new alert rules.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

18202200020406
SITE GLOW LIMITS THIS TARGET
SET UP 18:30 · OBSERVE 19:00–07:00 · 12H · MEAN 61

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

18202200020406
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 38

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

18202200020406
TWILIGHT BEGINS 06:00SITE GLOW LIMITS FAINT TARGETS
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 38

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

18202200020406
TWILIGHT BEGINS 06:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

18202200020406
SITE GLOW LIMITS THIS TARGET

Deep-sky visual is your current default.

A darker option

Headlands International Dark Sky Park

365 km away · Threatened dark sky · 21.3–21.6 mag/arcsec²

74conditions tonight
See the trade-off →

The next week of nights

Tonight · 10 Oct
71
Good
MOON 1%
20:00–06:00
Tomorrow · 11 Oct
68
Good
MOON 3%
20:00–01:00
Monday · 12 Oct
56
Good
MOON 7%
02:00–06:00
Tuesday · 13 Oct
54
Fair
MOON 13%
01:00–02:00
Wednesday · 14 Oct
34
Poor

Cloud or fog is the strongest score limit at the best sampled time.

MOON 21%
Thursday · 15 Oct
29
Poor

Cloud or fog is the strongest score limit at the best sampled time.

MOON 29%
Friday · 16 Oct
69
Good
MOON 37%
01:00–02:00

Open a night for its forecast times. Later forecasts may have wider time steps; missing hours are not interpolated.

Tonight · 10 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
12
62
51
60
61
54
64
69
70
71
71
36
Score
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
7%
8%
27%
56%
34%
26%
44%
22%
9%
0%
0%
0%
0%
0%
Transparency
0.65
0.60
0.58
0.63
0.63
0.52
0.49
0.51
0.50
0.45
0.43
0.42
0.39
0.36
Seeing
0.49
0.48
0.49
0.47
0.48
0.50
0.54
0.60
0.61
0.60
0.68
0.72
0.74
0.74
Moon clear
0%
down
down
down
down
down
down
down
down
down
down
down
down
down
18
19
20
21
22
23
00
01
02
03
04
05
06
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Tomorrow · 11 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
14
68
62
64
44
36
31
30
31
30
30
16
Score
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
11%
0%
2%
16%
9%
59%
81%
93%
95%
94%
98%
99%
99%
97%
Transparency
0.50
0.41
0.36
0.33
0.31
0.28
0.26
0.24
0.23
0.23
0.23
0.25
0.26
0.27
Seeing
0.75
0.73
0.72
0.70
0.69
0.68
0.67
0.67
0.70
0.71
0.72
0.72
0.72
0.72
Moon clear
2%
down
down
down
down
down
down
down
down
down
down
down
down
down
18
19
20
21
22
23
00
01
02
03
04
05
06
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Monday · 12 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
8
27
44
25
17
24
11
48
48
49
56
27
Score
Low cloud
1%
2%
2%
0%
9%
20%
11%
45%
20%
11%
9%
8%
20%
13%
Mid cloud
6%
5%
20%
29%
27%
25%
4%
30%
0%
2%
13%
2%
0%
0%
High cloud
16%
76%
89%
12%
80%
100%
100%
98%
10%
20%
0%
0%
0%
0%
Transparency
0.35
0.24
0.21
0.19
0.16
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.83
0.82
0.78
0.79
0.86
0.82
0.83
0.90
0.95
0.84
0.81
0.84
0.83
0.77
Moon clear
6%
down
down
down
down
down
down
down
down
down
down
down
down
down
18
19
20
21
22
23
00
01
02
03
04
05
06
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Tuesday · 13 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
54
Score
Low cloud
100%
100%
10%
88%
Mid cloud
0%
0%
7%
13%
High cloud
0%
0%
0%
68%
Transparency
0.28
0.29
0.17
0.16
Seeing
0.83
0.91
0.83
0.89
Moon clear
10%
12%
down
down
13
19
01
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Wednesday · 14 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
7
34
Score
Low cloud
100%
46%
2%
53%
Mid cloud
0%
0%
0%
0%
High cloud
4%
64%
91%
98%
Transparency
0.52
0.43
0.34
0.27
Seeing
0.79
1.00
0.77
0.95
Moon clear
17%
19%
down
down
13
19
01
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Thursday · 15 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
10
29
Score
Low cloud
0%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
High cloud
100%
100%
99%
89%
Transparency
0.85
0.43
0.10
0.10
Seeing
0.83
1.00
1.00
0.89
Moon clear
24%
27%
down
down
13
19
01
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Friday · 16 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
26
69
Score
Low cloud
6%
1%
6%
0%
Mid cloud
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
Transparency
0.65
0.75
0.43
0.13
Seeing
0.62
0.65
0.79
0.90
Moon clear
down
35%
down
down
13
19
01
07

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Planning a trip?

Compare the next eight weekends → · Best months to visit → · Moonless nights →

More nearby locations 8 options · openclose

About this forecast

Exact-coordinate weather, sky geometry and site context.

Full method →20-year baseline →
Sources and scoring details openclose

Conditions for Fond du Lac, Wisconsin, 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 astronomical twilight. Site darkness is shown separately, then used only where artificial skyglow physically changes moon contrast, haze scattering, visual limits and target suitability.