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Tonight · Sat, 10 October 2026

Spanish Fork stargazing forecast tonight

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

40.115°N 111.655°W ·1394 m ·Utah, United States

NearbySpringvilleRivertonSandyWest JordanMore nearby
12
/100
Not worth it conditions
at peak

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

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 Spanish Fork, Utah →Moonless nights →
Tonight in context · local sky & season

October historically: 13.5 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 8.7h 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
None tonight
Window quality
—
Astronomical dark
21:00 – 07:00
Moon
New moon, 1%
Transparency at peak
0.15
Seeing at peak (est.)
0.74
Visual limit (modelled)
3.5–5.5 mag
Tonight's limiting factor
Thin high cloud

90% high cirrus. Visual observers shrug it off; long exposures integrate it. What this means →

Also limiting: Transparency. See the guide →

The night, hour by hour

Colour = score · Luminance = everything else
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
2
3
12
8
4
3
2
3
2
3
1
Score
Low cloud
1%
3%
2%
2%
1%
9%
9%
27%
17%
38%
14%
63%
26%
9%
Mid cloud
100%
99%
99%
66%
77%
95%
96%
99%
97%
98%
100%
99%
100%
100%
High cloud
87%
84%
84%
90%
100%
99%
98%
99%
96%
91%
98%
98%
87%
86%
Transparency
0.50
0.10
0.10
0.15
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.58
0.50
0.66
0.74
0.85
0.82
0.85
0.88
0.92
1.00
1.00
1.00
1.00
1.00
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08
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
22 Not worth it · 12/100
Starting from
100
Cloud
−80
Transparency
−7
Seeing
−1
Moonlight
−0
Darkness
−0
Score
12
CLOUD 96% LOW 2% MID 66% HIGH 90% SUN -35.5° MOON -35.9° / 1% WIND 5 TEMP 14°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight is for planning

The sky is staying closed.

None of the five observing modes reaches a reliable setup window. Skip the empty charts and use tonight to make the next clear session easier.

Cloud stays at 96% or moreTransparency peaks at 0.15
Make the next clear night easier

Three useful moves, no dead chart.

The forecast detail above remains available when you need the measurements. These are the useful next decisions.

Scan the next seven nights → Read cloud by layer → Use tonight for equipment prep →
Remember what you observe

Your target still carries into clear-night recommendations and future alert rules.

Deep-sky visual is your current default.

A darker option

Capitol Reef National Park

217 km away · Natural-dark sky · 21.9–21.9 mag/arcsec²

5conditions tonight
See the trade-off →

The next week of nights

Tonight · 10 Oct
12
Not worth it

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

MOON 1%
Tomorrow · 11 Oct
35
Fair
MOON 3%
05:00–06:00
Monday · 12 Oct
32
Poor

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

MOON 7%
Tuesday · 13 Oct
34
Poor

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

MOON 13%
Wednesday · 14 Oct
0
Not worth it

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

MOON 21%
Thursday · 15 Oct
32
Poor

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

MOON 29%
Friday · 16 Oct
57
Good
MOON 37%
06:00–07:00

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
2
3
12
8
4
3
2
3
2
3
1
Score
Low cloud
1%
3%
2%
2%
1%
9%
9%
27%
17%
38%
14%
63%
26%
9%
Mid cloud
100%
99%
99%
66%
77%
95%
96%
99%
97%
98%
100%
99%
100%
100%
High cloud
87%
84%
84%
90%
100%
99%
98%
99%
96%
91%
98%
98%
87%
86%
Transparency
0.50
0.10
0.10
0.15
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.58
0.50
0.66
0.74
0.85
0.82
0.85
0.88
0.92
1.00
1.00
1.00
1.00
1.00
Moon clear
down
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08

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
7
3
1
1
2
3
4
13
26
35
29
4
Score
Low cloud
4%
2%
22%
70%
88%
63%
43%
36%
28%
22%
20%
21%
21%
16%
Mid cloud
47%
79%
99%
100%
98%
99%
100%
100%
78%
55%
34%
48%
25%
67%
High cloud
36%
49%
73%
61%
45%
51%
38%
16%
3%
2%
0%
0%
0%
1%
Transparency
0.30
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.12
0.13
0.11
0.10
0.10
0.10
Seeing
0.69
0.48
0.54
0.88
1.00
1.00
1.00
0.93
0.92
1.00
0.95
0.96
0.89
0.97
Moon clear
3%
down
down
down
down
down
down
down
down
down
down
down
down
down
19
20
21
22
23
00
01
02
03
04
05
06
07
08

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
15
32
22
26
8
12
Score
Low cloud
13%
1%
1%
6%
3%
4%
0%
100%
Mid cloud
92%
65%
53%
62%
57%
88%
90%
100%
High cloud
78%
18%
9%
33%
24%
67%
2%
21%
Transparency
0.10
0.10
0.12
0.10
0.10
0.10
0.10
0.20
Seeing
0.93
0.94
1.00
1.00
1.00
1.00
1.00
0.76
Moon clear
7%
down
down
down
down
down
down
10%
19
20
21
22
23
00
06
12

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
8
34
Score
Low cloud
8%
86%
29%
16%
Mid cloud
38%
16%
33%
75%
High cloud
18%
0%
0%
51%
Transparency
0.29
0.10
0.17
0.55
Seeing
1.00
1.00
1.00
1.00
Moon clear
12%
down
down
17%
18
00
06
12

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
Score
Low cloud
11%
100%
97%
50%
Mid cloud
60%
77%
99%
97%
High cloud
31%
97%
100%
25%
Transparency
0.37
0.17
0.10
0.26
Seeing
1.00
1.00
1.00
1.00
Moon clear
19%
down
down
down
18
00
06
12

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
32
22
Score
Low cloud
34%
48%
12%
44%
Mid cloud
29%
6%
57%
23%
High cloud
1%
0%
43%
7%
Transparency
0.35
0.10
0.21
0.34
Seeing
1.00
1.00
1.00
1.00
Moon clear
27%
down
down
down
18
00
06
12

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
4
57
Score
Low cloud
0%
47%
9%
0%
Mid cloud
21%
89%
1%
0%
High cloud
46%
85%
1%
0%
Transparency
0.37
0.25
0.10
0.43
Seeing
1.00
1.00
1.00
1.00
Moon clear
35%
down
down
down
18
00
06
12

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 Spanish Fork, Utah, 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.