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Tonight · Sat, 10 October 2026

Riverton stargazing forecast tonight

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

40.522°N 111.939°W ·1357 m ·Utah, United States

NearbySandyWest JordanSalt Lake CitySpringvilleMore nearby
14
/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
18.4–19.1 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 Riverton, 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
0.86
Seeing at peak (est.)
0.41
Visual limit (modelled)
3.5–5.5 mag
Tonight's limiting factor
Thin high cloud

81% high cirrus. Visual observers shrug it off; long exposures integrate it. What this means →

Also limiting: Seeing. See the guide →

The night, hour by hour

Colour = score · Luminance = everything else
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
8
14
11
12
8
4
4
2
1
1
Score
Low cloud
2%
0%
0%
0%
1%
1%
2%
6%
29%
65%
86%
58%
41%
36%
Mid cloud
90%
77%
77%
86%
79%
80%
95%
93%
99%
99%
100%
100%
100%
100%
High cloud
94%
85%
81%
71%
87%
94%
98%
98%
93%
92%
99%
95%
98%
78%
Transparency
0.99
0.98
0.86
0.79
0.73
0.23
0.11
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.61
0.37
0.41
0.41
0.48
0.50
0.52
0.58
0.66
0.78
0.82
0.88
0.86
0.88
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
21 Not worth it · 14/100
Starting from
100
Cloud
−83
Transparency
−1
Seeing
−2
Moonlight
−0
Darkness
−0
Score
14
CLOUD 94% LOW 0% MID 77% HIGH 81% SUN -24.3° MOON -24.5° / 1% WIND 8 TEMP 20°
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 94% or more
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

Great Basin National Park

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

6conditions tonight
See the trade-off →

The next week of nights

Tonight · 10 Oct
14
Not worth it

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

MOON 1%
Tomorrow · 11 Oct
21
Poor

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

MOON 3%
Monday · 12 Oct
19
Poor

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

MOON 7%
Tuesday · 13 Oct
47
Fair
MOON 13%
06:00–07:00
Wednesday · 14 Oct
11
Not worth it

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

MOON 21%
Thursday · 15 Oct
48
Fair
MOON 29%
00:00–01:00
Friday · 16 Oct
48
Fair
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
8
14
11
12
8
4
4
2
1
1
Score
Low cloud
2%
0%
0%
0%
1%
1%
2%
6%
29%
65%
86%
58%
41%
36%
Mid cloud
90%
77%
77%
86%
79%
80%
95%
93%
99%
99%
100%
100%
100%
100%
High cloud
94%
85%
81%
71%
87%
94%
98%
98%
93%
92%
99%
95%
98%
78%
Transparency
0.99
0.98
0.86
0.79
0.73
0.23
0.11
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.61
0.37
0.41
0.41
0.48
0.50
0.52
0.58
0.66
0.78
0.82
0.88
0.86
0.88
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
4
2
1
1
3
2
7
5
7
21
3
Score
Low cloud
4%
25%
78%
74%
81%
32%
59%
15%
56%
100%
80%
44%
31%
21%
Mid cloud
81%
93%
88%
100%
100%
100%
100%
95%
86%
74%
37%
37%
41%
31%
High cloud
19%
20%
53%
38%
78%
72%
58%
1%
23%
19%
14%
8%
5%
0%
Transparency
0.32
0.20
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
0.30
0.24
0.50
0.90
0.92
0.95
0.97
0.88
0.84
0.70
0.74
0.64
0.65
0.75
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
16
10
13
19
13
7
Score
Low cloud
18%
9%
25%
44%
13%
14%
21%
43%
Mid cloud
39%
46%
73%
61%
64%
69%
95%
99%
High cloud
13%
41%
64%
30%
33%
62%
8%
18%
Transparency
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.38
Seeing
0.96
0.88
0.80
0.93
0.97
0.81
1.00
1.00
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
10
47
Score
Low cloud
54%
52%
16%
17%
Mid cloud
42%
73%
22%
50%
High cloud
25%
9%
0%
3%
Transparency
0.10
0.10
0.24
0.45
Seeing
1.00
1.00
1.00
1.00
Moon clear
12%
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.

Wednesday · 14 Oct · forecast times
Sky state
Shaded = daylight and twilight  ·  unshaded = astronomical dark
11
1
Score
Low cloud
13%
76%
88%
100%
Mid cloud
87%
19%
98%
99%
High cloud
6%
23%
82%
0%
Transparency
0.26
0.12
0.20
0.10
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
48
45
Score
Low cloud
59%
23%
16%
3%
Mid cloud
45%
5%
18%
3%
High cloud
0%
0%
7%
3%
Transparency
0.23
0.13
0.17
0.62
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
34
48
Score
Low cloud
1%
13%
6%
20%
Mid cloud
10%
38%
28%
6%
High cloud
49%
27%
0%
0%
Transparency
0.43
0.24
0.21
0.43
Seeing
0.95
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 Riverton, 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.