Revontulet - Aurora Finland
Weather
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Home Screen and Lock Screen widgets show your aurora chance at a glance. Plus the map, a two-night forecast, moon, clouds and optional alerts.
Revontulet shows your chance of seeing the northern lights right now where you are in Finland, and how the next two nights look.
THE CHANCE TO SEE, NOW
The app calculates the same activity value (R) that the Finnish Meteorological Institute (FMI) uses, from magnetometer measurements at the station nearest you. It combines it with darkness, the moon and cloud cover, and gives one clear answer: None, Low, Moderate or High, with a short reason such as "Overcast" or "Bright moon".
AURORA MAP
Swipe left to see every FMI magnetometer station on a map of Finland. The map shows where auroras are probable, possible or unlikely right now, against each station's own thresholds. Tap a station to see its activity value.
WIDGETS
Add a small or medium widget to your Home Screen, or a circular, rectangular or inline widget to your Lock Screen, to see your chance at a glance. The widget follows the app's place and updates itself sparingly. If the data is old, no place is chosen or no data is available, the widget says so plainly.
EARLY WARNING
Solar wind measured between the Sun and Earth shows about 30–60 minutes in advance whether aurora activity is about to rise.
FORECAST FOR TONIGHT AND TOMORROW NIGHT
A two-night forecast from NOAA's Kp forecast and geomagnetic storm watches, combined with darkness, the moon and FMI's cloud forecast. Tap it to see what helps and what limits each night.
AURORA ALERTS
Turn on alerts to get a notification when the chance in your area reaches Moderate or High, even when the app is closed. At most three alerts a night.
DETAILS WHEN YOU WANT THEM
Open Details to see the activity at the nearest station, darkness, the moon's phase, cloud cover and the latest solar wind.
PRIVATE BY DESIGN
Your location stays on your iPhone. Requests for measurement data cover all of Finland and contain nothing about you.
No accounts, no ads, no analytics, no tracking.
Alerts are optional and use only a coarse area of Finland, never your position.
Widgets collect nothing new.
Don't want to share your location? Choose your municipality by hand.
OPEN DATA
Measurements and cloud data: Finnish Meteorological Institute (FMI), CC BY 4.0 Space weather: NOAA Space Weather Prediction Center Municipality boundaries: Statistics Finland, CC BY 4.0
Revontulet covers Finland and is available in Finnish, Swedish and English.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New widgets: add a widget to your Home Screen or Lock Screen to see your aurora chance for your place at a glance. Widgets follow the app's place and update themselves. If the data is old or missing, the widget says so. Nothing new is collected.
Plus smaller fixes to layout and accessibility.
The developer, JOUNI MARKUS UUSIMAA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JOUNI MARKUS UUSIMAA
- Size
- 14.6 MB
- Category
- Weather
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 2 more
- English, Finnish, Swedish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Jouni Uusimaa