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Night Forecast

Weather
Observing Conditions.

Hour-by-hour night-window forecast built for observing, imaging, and planning around clouds, rain risk, visibility, dew spread, wind, humidity, and your active rig.

Fair conditions
Observing Outlook

Fair conditions expected

Night-window score reflects clouds, rain risk, visibility, dew risk, wind, and humidity. Clouds 70%, rain risk 22%, wind 7 mph.

55/100 Fair Best: 12 AM
Choose Forecast Date
Su M T W Th F Sa
31 1 2 3 4 5 6 7 8 9 10 11 12 13
Forecast Location Chicago Area 41.878100, -87.629800 41.87810, -87.62980
Overall 55 Fair
Clouds 70% Mostly cloudy
Rain Risk 22% Max overnight
Visibility 9 mi Limited
Wind 7 mph Gusts 16 mph
Observatory Intelligence

No default rig selected

Add your telescope, focal length, and mount to unlock equipment-specific weather guidance.

Ephemeris can interpret wind, cloud layers, humidity, and dew risk differently for widefield, mid-focal, and long-focal-length setups.

Best Use Tonight General observing guidance
Avoid Tonight Rig-specific guidance unavailable
Improves After 12 AM
•
Visual Observing

General sky conditions are available now.

What makes an observing forecast different? →
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Deep Sky Imaging

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Why does rig data matter for imaging? →
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Planetary / Lunar

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Why does focal length change weather sensitivity? →
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Forecast Confidence

Low Confidence

Conditions appear changeable enough that the observing window may shift.

1 forecast source active
  • Primary source: Open-Meteo atmospheric forecast
  • Confidence improves as additional forecast models are added
  • Cloud cover changes sharply during the night
  • High humidity may cause local conditions to underperform the forecast
Hour-by-Hour

Observing Window

2026-06-05 7 PM → next morning 6 AM
Time Score Outlook Clouds Low Mid High Rain Visibility Dew Spread Wind Humidity
6/5 - 7 PM 49 Fair 100% 100% 0% 100% 22% 11.6 mi 4.5°F ? 9 mph 86%
6/5 - 8 PM 58 Fair 100% 0% 100% 79% 19% 10.4 mi 4°F ? 9 mph 87%
6/5 - 9 PM 43 Poor 91% 50% 88% 91% 15% 9.5 mi 3.1°F ? 5 mph 90%
6/5 - 10 PM 48 Fair 72% 72% 0% 0% 11% 9.6 mi 2.7°F ? 9 mph 91%
6/5 - 11 PM 45 Fair 100% 43% 100% 0% 15% 8.9 mi 3.1°F ? 6 mph 90%
6/6 - 12 AM 73 Good 0% 0% 0% 0% 19% 8.3 mi 4°F ? 7 mph 87%
6/6 - 1 AM 71 Good 7% 7% 0% 0% 14% 8.3 mi 3.4°F ? 7 mph 89%
6/6 - 2 AM 61 Fair 23% 23% 0% 0% 13% 8.3 mi 2.2°F ? 5 mph 93%
6/6 - 3 AM 50 Fair 92% 92% 0% 0% 12% 8.1 mi 2.2°F ? 6 mph 93%
6/6 - 4 AM 53 Fair 65% 65% 0% 0% 13% 8.3 mi 2.1°F ? 7 mph 93%
6/6 - 5 AM 48 Fair 96% 55% 0% 96% 21% 8 mi 2.4°F ? 8 mph 92%
6/6 - 6 AM 64 Fair 97% 19% 0% 97% 16% 8.2 mi 3.1°F ? 10 mph 90%
Cloud Timeline

Cloud Cover by Hour

Each hour shows total cloud cover plus the split between low, mid, and high cloud layers.

Low Mid High
7 PM
100% Total
Low
100%
Mid
0%
High
100%
8 PM
100% Total
Low
0%
Mid
100%
High
79%
9 PM
91% Total
Low
50%
Mid
88%
High
91%
10 PM
72% Total
Low
72%
Mid
0%
High
0%
11 PM
100% Total
Low
43%
Mid
100%
High
0%
12 AM
0% Total
Low
0%
Mid
0%
High
0%
1 AM
7% Total
Low
7%
Mid
0%
High
0%
2 AM
23% Total
Low
23%
Mid
0%
High
0%
3 AM
92% Total
Low
92%
Mid
0%
High
0%
4 AM
65% Total
Low
65%
Mid
0%
High
0%
5 AM
96% Total
Low
55%
Mid
0%
High
96%
6 AM
97% Total
Low
19%
Mid
0%
High
97%
Why this score?

Limiting Factors

Dew Spread 3.1°F Major limiter
Humidity 90% Major limiter
Low Clouds 44% High impact
Visibility 9 mi High impact
High Clouds 39% Moderate impact
Source Comparison

Forecast Sources

MVP starts with Open-Meteo; additional sources will improve confidence scoring.
Source Clouds Rain Humidity Wind Status
Open-Meteo 70% 22% 90% 7 mph Primary