Clear
Not a single cloud up there. Grab your shades and go.
Weather with a twist
Accurate weather for any city. With a sense of humour.
SYNTHLUCIDA WEATHER is a free weather forecast app. Current temperature, hourly and 7-day forecast, severe weather alerts and a 48-hour rain outlook – plus tips on what to wear and where to go. No sign-up, no ads, right in your browser.
- Free
- No sign-up
- No ads or cookies
- Any city in the world
Not just numbers
Why it’s weather with a twist
Next to the temperatures and graphs, the app adds a short one-liner for every kind of weather – in plain, casual language rather than a dry textbook description. The lines change with the current conditions and the day of the week, and the app keeps count of how long is left until the weekend.
Rain
It’s bucketing down – an umbrella is mandatory kit today.
Heat
Hot as a sauna – drink water and don’t play the hero in the sun.
Frost
Cold as a freezer – dress in layers like an onion.
Fog
Fog as thick as soup – switch your lights on.
Storm
The sky’s putting on a free firework show, watch it from the window.
What it does
Everything that matters about the weather, in one place
From a quick glance at the temperature to a detailed hourly forecast – plus a few things you won’t find in the usual weather apps.
Current weather
Temperature, feels-like, humidity, precipitation, sunshine and wind, including gusts and a compass direction.
Hourly forecast
The next 24 hours with a clear temperature graph and the chance of rain for every hour.
7-day forecast
Tap a day to see precipitation, wind, UV index and sunrise and sunset times.
Severe weather warnings
Storms, strong wind, heavy rain, snow, ice, extreme heat or frost and high UV in the coming days.
48-hour rain outlook
When the rain starts and stops, roughly how much will fall and whether a storm is joining in.
Pressure & how you feel
Air pressure, its trend and how it may make you feel on the day.
What to wear
Clothing tips based on feels-like temperature, rain and wind – from shorts to full Siberia mode.
Where to go
Cycling, skating, hiking, camping, sledging and mushroom foraging – whether today works and when it gets better.
Sun & moon
An arc of the sun between sunrise and sunset, the moon phase and the next full and new moon.
Golden & blue hour
The best light for photos, calculated for today and your chosen place.
ISS flyovers
When the International Space Station will visibly fly over you, where it rises and how high it gets.
Favourites & export
Saved cities one tap away, colour themes and data export to PDF or CSV.
Colours of the sky
The app dresses for the weather
In “By weather” mode the app’s colours follow what’s happening outside – gold for sunshine, purple for storms, icy turquoise for snow. Prefer your own look? Pick a theme.
Clear
Night
Cloudy
Fog
Rain
Snow
Storm
Your pick
Privacy
Your data stays with you
The app runs entirely in your browser and has no server of its own where it could store anything about you.
No sign-up
No account, e-mail or password. Open it and you see the weather straight away.
No cookies, no ads
The site sets no cookies and shows no ads. Visits are only counted anonymously.
Data stays on your device
Favourite cities and your theme live only in your browser. Your location is rounded to about 1 km.
All the details are in the privacy policy.
FAQ
What people ask most
Is SYNTHLUCIDA WEATHER free?
Yes, the app is completely free and needs no sign-up or account.
Where does the weather data come from?
The forecast is loaded in real time from Open-Meteo, which is based on models from national weather services.
Does it work for any city?
Yes, just type the name of any city in the world, or allow your location with one tap. Times are shown in the local time of the chosen city.
Can it warn me about dangerous weather?
Yes, it flags storms, strong wind, heavy rain or snow, ice, extreme heat or frost and high UV in the coming days. These aren’t official warnings from a national weather service, they’re calculated from the forecast.
Where does the app store data?
Favourite cities and your chosen colour theme stay only in your browser. The app has no server of its own, uses no cookies and only counts visits anonymously.
Can I use it on my phone?
Yes, it’s built mainly for mobile and you can add it to your home screen like an app.
Is there a Czech version?
Yes – the app was born in Czech, you’ll find the Czech version at weather.html.
From SYNTHLUCIDA
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