StarCast · iPhone App

Best Stargazing Weather App

Standard weather apps show cloud cover. LightCast StarCast is built for stargazers: atmospheric transparency, moon phase, and Bortle class scored together with cloud cover into one forecast. Push alerts when tonight looks good.

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iOS app: $2.99/mo · 7-day free trial · Cancel anytime

Why weather apps fail stargazers

What StarCast Shows That Weather Apps Don't

A generic weather app is built around precipitation and temperature — the variables that matter for most people's daily lives. For stargazing, those aren't the numbers that count. You need cloud cover broken down by layer, atmospheric transparency, moon timing, and your location's light pollution baseline. StarCast is built specifically around the variables that determine whether stargazing is actually worth doing tonight.

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Atmospheric Transparency: The Variable Weather Apps Skip

High humidity and aerosols reduce star brightness even with zero cloud cover — and no standard weather app shows this. StarCast factors atmospheric transparency into every night sky score. A "clear" night with poor transparency scores differently from a clear night with excellent transparency — because they produce completely different results.

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Moon Phase, Rise, and Set Timing

A full moon is as bright as street lighting for astronomical purposes. Weather apps don't show this at all. StarCast displays moon illumination, rise time, and set time so you know exactly when the sky goes dark — and how long that window lasts.

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Bortle Class: Your Sky's Baseline

Light pollution is a permanent condition that weather can't change. StarCast loads your Bortle class from GPS coordinates automatically and factors it into the score — so a 90/100 in a dark sky reserve means something different from a 90/100 in a suburb.

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Push Alerts When Conditions Align

Good stargazing nights are rare. Checking a forecast daily to find them is tedious. StarCast monitors conditions for your saved locations and pushes an alert when tonight scores above your threshold. Set it once. Exclusive to the iOS app.

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Stop Checking. Start Getting Alerts.

StarCast sends a push notification when tonight's conditions clear your threshold at any saved location. No more daily forecast checks. Good nights find you. Exclusive to the iOS app.

Common Questions

What is the best stargazing weather app?

LightCast StarCast. It scores cloud cover, atmospheric transparency, moon phase, and Bortle class together and sends push alerts when a good night is forecast. Free on web, push alerts on iOS. Download here. $2.99/month after a 7-day free trial.

Is StarCast free?

The web version at lightcastsuite.com/starcast is free. The iOS app includes a 7-day free trial, then $2.99/month. Push alerts and saved locations are iOS-only features.

What weather variables matter most for stargazing?

In order: moon phase (biggest impact), cloud cover, atmospheric transparency, and your Bortle class baseline. Standard weather apps only show cloud cover — StarCast scores all four together.

Does StarCast show cloud cover forecasts?

Yes. StarCast shows tonight's cloud cover forecast from Open-Meteo updated hourly, scored in bands that reflect real impact on visibility. It also shows the 3-day outlook so you can identify the best night in an upcoming clear window rather than just reacting to tonight.

What else does LightCast include?

Six tools: StarCast (night sky), GoldCast (sunset), DroneCast (drone flight), CloudCast (cloud conditions), FogCast (fog), and TriCast (camera calculators). All six for $2.99/month after a 7-day free trial.