Is the sky clear tonight?

Check your location in one tap

Don't squint at the cloud app and guess. ClearSkys reads tonight's cloud cover, moon, wind and humidity for your exact spot and scores it out of 100 — then picks out the clearest window of the night, hour by hour, so you know whether it's worth setting up the scope.

Don't want to share your location? No problem — enter your location here instead.

FREE · NO SIGN-UP · ANY LOCATION ON EARTH

Tonight's ForecastAmsterdam

Worth a look tonight

Good
69GOOD
BWBest window20:00 – 01:00
HRUsable hours5 of 7
MNMoon5% Waxing Crescent
View full forecast → · use my location

A straight answer, for your location

Most forecasts show you a cloud percentage and leave you to work out what it means. ClearSkys gives you a verdict: clear enough tonight, or not — and exactly when.

Is it a clear sky tonight?check → Will it be clear skies tonight?check → Is the sky clear right now?check → When is the next clear night?check → Clear skies for stargazing near mecheck → Clear night sky forecastcheck →

How to check if it's clear tonight

Three taps, no account.

01

Share your location

Tap “use my location” or type any place on Earth. ClearSkys pulls the cloud forecast for your exact coordinates.

02

Read the score

One number, 0–100, for tonight. Above 65 is worth going out; above 80, don't miss it. The clearest hours are marked.

03

Pick your window

Even a cloudy night often has a gap. ClearSkys highlights the best clear-sky window so you set up at the right time.

80–100 Excellent 65–79 Good 45–64 Mixed Below 45 Poor

What makes a sky “clear”

It's more than the cloud number. See the full method →

Biggest factor

Cloud cover

Low, mid and high cloud weighted separately — thin high cloud still washes out faint targets.

Brightness

Moon

A full moon near your target drowns the sky. Illumination and altitude are both scored.

Steadiness

Wind & seeing

Wind shakes the scope; the jet stream blurs the view. Both pull the score down.

Optics

Humidity & dew

Damp air fogs optics and lowers transparency, so a “cloudless” night can still score poorly.

Cloudy tonight? Find the next clear night

Every location carries a 7-day outlook. See tonight's scores for cities worldwide on the map →

Pick a city to see its clear-sky forecast, or open the app and search your own spot. Save a location and ClearSkys can send a free alert the next time a genuinely clear night lands — no need to keep checking.

Clear sky tonight — common questions

The questions people ask most before heading out.

Is the sky clear tonight?▾
Tap “use my location” (or enter any place) and ClearSkys shows tonight's cloud cover hour by hour, rolled into a single clear-sky score from 0 to 100. Above 65 means clear enough to get the telescope out; below 45 means stay in. You'll also see the clearest window of the night, so you know exactly when to look up.
Will it be clear skies tonight where I am?▾
ClearSkys checks the cloud forecast for your exact coordinates, not just your town, and breaks the night into hourly slots. Even a mostly cloudy night often has a clear gap — the forecast highlights it so you don't miss a usable window.
When is the next clear night sky?▾
Each location comes with a 7-day outlook, so if tonight is cloudy you can see which of the coming nights scores highest and plan around it. Save a location and ClearSkys can alert you when a clear night lands.
How do you know if the sky is clear for stargazing?▾
Cloud cover is the biggest factor — low, mid and high cloud are weighted separately because thin high cloud still ruins faint targets. After that, moon brightness, wind (which shakes the scope), humidity (which fogs optics) and rain probability all feed the 0–100 score.
Does ClearSkys work for my location?▾
Yes — any location on Earth. Weather comes from Open-Meteo's global coverage and all astronomy (sun, moon, planets, aurora) is computed for your exact coordinates, so the forecast is local wherever you are.

So — is tonight the night?

Check your location now. It's free, there's no sign-up, and it works anywhere on Earth.

Check Tonight's Sky →