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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.

Poor conditions
Observing Outlook

Poor conditions expected

Night-window score reflects clouds, rain risk, visibility, dew risk, wind, and humidity. Clouds 100%, rain risk 1%, wind 9 mph.

25/100 Poor Best: Not recommended
Choose Forecast Date
Su M T W Th F Sa
4 5 6 7 8 9 10 11 12 13 14 15 16 17
Forecast Location Chicago Area 41.878100, -87.629800 41.87810, -87.62980
Overall 25 Poor
Clouds 100% Overcast
Rain Risk 1% Max overnight
Visibility 15.0 mi Good
Wind 9 mph Gusts 28 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 7 PM
•
Visual Observing

General sky conditions are available now.

What makes an observing forecast different? →
•
Deep Sky Imaging

Add a default rig for tailored guidance.

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

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Why does focal length change weather sensitivity? →
Set a default rig →
Forecast Confidence

High Confidence

Forecast conditions are relatively stable across the night window.

3 forecast source active
  • Forecast sources active: 2
  • Alert sources active: 1
  • Forecast models disagree during multiple observing hours
  • Cloud cover changes sharply during the night
Hour-by-Hour

Observing Window

2026-10-10 7 PM → next morning 6 AM
Time Score Outlook Clouds Low Mid High Rain Visibility Dew Spread Wind Humidity Temp
10/10 - 7 PM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 26.9°F 10 mph 38% 72°F
10/10 - 8 PM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 25.5°F 10 mph 40% 71°F
10/10 - 9 PM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 24.1°F 9 mph 42% 70°F
10/10 - 10 PM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 23.4°F 9 mph 43% 69°F
10/10 - 11 PM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 23.3°F 8 mph 43% 68°F
10/11 - 12 AM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 23.3°F 7 mph 43% 68°F
10/11 - 1 AM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 23.2°F 7 mph 43% 67°F
10/11 - 2 AM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 22.0°F 8 mph 45% 67°F
10/11 - 3 AM 25 Poor 100% 0% 0% 100% 1% 15.0 mi 20.8°F 10 mph 47% 66°F
10/11 - 4 AM 25 Poor 100% 0% 2% 100% 1% 15.0 mi 19.1°F 11 mph 50% 65°F
10/11 - 5 AM 25 Poor 100% 1% 31% 100% 1% 15.0 mi 17.5°F 9 mph 53% 65°F
10/11 - 6 AM 25 Poor 100% 4% 71% 100% 1% 15.0 mi 15.5°F 6 mph 57% 64°F
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
0%
Mid
0%
High
100%
8 PM
100% Total
Low
0%
Mid
0%
High
100%
9 PM
100% Total
Low
0%
Mid
0%
High
100%
10 PM
100% Total
Low
0%
Mid
0%
High
100%
11 PM
100% Total
Low
0%
Mid
0%
High
100%
12 AM
100% Total
Low
0%
Mid
0%
High
100%
1 AM
100% Total
Low
0%
Mid
0%
High
100%
2 AM
100% Total
Low
0%
Mid
0%
High
100%
3 AM
100% Total
Low
0%
Mid
0%
High
100%
4 AM
100% Total
Low
0%
Mid
2%
High
100%
5 AM
100% Total
Low
1%
Mid
31%
High
100%
6 AM
100% Total
Low
4%
Mid
71%
High
100%
Why this score?

Limiting Factors

High Clouds 100% Major limiter
Visibility 15 mi Moderate impact
Wind 9 mph Moderate impact
Mid Clouds 9% Low impact
Humidity 45% Low impact
Source Comparison

Forecast Sources

MVP starts with Open-Meteo; additional sources will improve confidence scoring.
Source Clouds Rain Humidity Wind Status
Open-Meteo 100% 1% 45% 9 mph Primary forecast
Tomorrow.io -- -- -- -- Secondary forecast active
National Weather Service -- -- -- -- Active alert cap: 20