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São José dos Campos

São Paulo, Brazil
Today
Feb 21, 2026
Poor

Netflix & Chill Night (Too Cloudy)

A 14% illuminated waxing gibbous drowns out all but the very brightest objects.

Tonight's Forecast
0
/ 100
First Light Index
Poor
Our proprietary metric combining sky clarity, moon interference, and light pollution for optimal stargazing conditions.
0
/ 100
Shutter Score
Poor
Photography-specific metric factoring cloud quality and golden hour potential for landscape shooters.

Light Windows Today

Blue HourGolden HourGolden HourBlue Hour
4 AM12 PM11 PM
Sunrise
5:55 AM
Golden: 44min
Sunset
6:38 PM
Golden: 44min
True Darkness
7:56 PM
Stars visible

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Morning Golden Hour
5:41 AM - 6:25 AM
Evening Golden Hour
6:08 PM - 6:52 PM
Dark Sky Window
7:56 PM onwards
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  1. 1. Download the .ics file above
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  4. 4. You'll get 30-minute reminders before each window
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Moon Phase

14%
Phase
Waxing Gibbous
Illumination
14%
💡 Slight Moon Interference
Moon may affect darkest sky observations

Light Pollution

8
Class 1
DarkClass 5
SuburbanClass 9
City
São José dos Campos Classification
Poor for Astronomy
Bortle Class 8: City Sky

City sky

Visible Tonight

Sky glows whitish gray, only brightest stars visible, M44 invisible

💡 Urban Sky Recommendation
Focus on lunar and planetary observation. Consider driving to a darker location for deep sky work.
💡 Tip: Check "Nearby Dark Sky" section below to find better observing sites within driving distance

Weather Conditions

Cloud Cover
77%
Heavy clouds - limited visibility and light
Morning
100%
Evening
67%
Overnight
97%
Precipitation
8%
Very unlikely
Wind
15
km/h avg
Gusts up to 34 km/h
🟡 Breezy - May affect tracking
Humidity
75%
High - May cause haze
Visibility
23.4
km
Excellent clarity
Temperature
28°C
High
/
16°C
Low
Seeing
2
/ 5
Fair - Atmospheric stability
Transparency
1
/ 5
Hazy - Air clarity
Conditions Summary
🌪️ Poor seeing - Stick to wide-field imaging or wait for better atmospheric stability

Nearby Dark Sky Locations

Within 100km

Água Rasa

Bortle
8
3
Dramatic improvement
313.1km·~3h 55min

Pompéu

Bortle
8
3
Dramatic improvement
448.9km·~5h 37min
💡 These locations have significantly darker skies (8 → 3). Expect 32x more visible stars.

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