POSEIDON System Weather Android
POSEIDON System Weather gets 100+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
POSEIDON System Weather is #63 in Weather Free on Google Play in Turkey and charting in 1 of 23 countries we track.
Updated 25 Oct 2026 · rankings refresh through the day
Developerposeidon team
CategoryWeather
PriceFree
Released
Installs100k+
Rating★ 3.9 (753)
Updated
Content ratingEveryone
Rating
3.9 ★
753 ratings
Measured
Best rank now
#63
Measured
POSEIDON System Weather on Google Play
App details
App ID
gr.hcmr.poseidon.twa
Publisher
ΕΛΛΗΝΙΚΟ ΚΕΝΤΡΟ ΘΑΛΑΣΣΙΩΝ ΕΡΕΥΝΩΝ (Hellenic Centre for Marine Research)
Publisher country
Greece
Content rating
Everyone
POSEIDON System Weather downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where POSEIDON System Weather's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| WeatherFree | #63 |
Apps near POSEIDON System Weather on the chart
Weather Free, around #63.
Ratings
Google Play, worldwide.
Rating
3.9 ★
753 ratings
Measured
Ratings
753
Measured
Written reviews
5
Measured
About POSEIDON System Weather
POSEIDON System app provides easy access to the updated view of the meteorological, wave, hydrodynamic and ecosystem forecasts provided in POSEIDON System official website poseidon.hcmr.gr. The forecasts are updated daily covering the next five days.
Meteo Forecast:
Spatial coverage: mid and South Europe, Mediterranean Sea and North Africa
• Surface wind (10m)
• Rainfall
• Air Temperature (2m)
• Cloudiness
• Snowfall
• Dust
• Atmospheric Pressure
Waves Forecast:
Spatial coverage: Mediterranean Sea, Sea of Marmara and Black Sea
• Significant Wave Height & Direction (WW3 model)
• Significant Wave Height & Direction (WAM model)
Sea Level Forecast:
Spatial coverage: Mediterranean Sea
• Total Elevation
• Tidal Elevation
• Surge Elevation
Hydrodynamics Forecast:
Spatial coverage: Mediterranean Sea
• Sea Surface Temperature
• Sea Surface Salinity
• Surface (5m) Circulation
Ecosystem Forecast:
Spatial coverage: Mediterranean Sea
• Chlorophyll-a (0-10m average)
• Nitrates (Surface)
• Ammonium (Surface)
• Phosphates (Surface)
• Bacteria Biomass (Surface)
• Mesozooplankton (Surface)
• Phytoplankton Biomass (Surface)
• Primary Production (Surface)
• Bacterial Production (Surface)
• Primary Production (200m Integrated)
• Bacterial Production (200m Integrated)
Color bar: click on the color bar to change units for surface wind (kt, m/s, bft), air temperature (°C, °F) and sea surface circulation (kt, m/s)
Flow Animation: streamlines presenting the flow of the wind, the waves or the sea currents depending on the selected model
Isobars: Add the isobars layer on top of the selected forecast with option under menu
Interactive map: Zoom in and out and move the map to any area of interest.
Point of interest: Clicking on any point on the area covered by the forecasting model, will provide a quick view of the forecast value on the selected point. Clicking on the orange arrow on the tip, will open a summary of the forecast for the whole forecasting period for this point.
City labels: Clicking on city labels, opens a summary of the forecast for the whole forecasting period for the specific city.
User location: If location trace is permitted, select on location pin on the right side of the screen to view forecast on your current location.
Date time section: Select a specific date time within the forecasting period or animate the forecasts automatically by clicking on the play button next to the time selector.
Help guide: Press the exclamation mark on the right of the screen to open the short guide.
UTC and local time options. English and Greek languages.
Vertical and Horizontal view enabled.
No advertisements.
Meteo Forecast:
Spatial coverage: mid and South Europe, Mediterranean Sea and North Africa
• Surface wind (10m)
• Rainfall
• Air Temperature (2m)
• Cloudiness
• Snowfall
• Dust
• Atmospheric Pressure
Waves Forecast:
Spatial coverage: Mediterranean Sea, Sea of Marmara and Black Sea
• Significant Wave Height & Direction (WW3 model)
• Significant Wave Height & Direction (WAM model)
Sea Level Forecast:
Spatial coverage: Mediterranean Sea
• Total Elevation
• Tidal Elevation
• Surge Elevation
Hydrodynamics Forecast:
Spatial coverage: Mediterranean Sea
• Sea Surface Temperature
• Sea Surface Salinity
• Surface (5m) Circulation
Ecosystem Forecast:
Spatial coverage: Mediterranean Sea
• Chlorophyll-a (0-10m average)
• Nitrates (Surface)
• Ammonium (Surface)
• Phosphates (Surface)
• Bacteria Biomass (Surface)
• Mesozooplankton (Surface)
• Phytoplankton Biomass (Surface)
• Primary Production (Surface)
• Bacterial Production (Surface)
• Primary Production (200m Integrated)
• Bacterial Production (200m Integrated)
Color bar: click on the color bar to change units for surface wind (kt, m/s, bft), air temperature (°C, °F) and sea surface circulation (kt, m/s)
Flow Animation: streamlines presenting the flow of the wind, the waves or the sea currents depending on the selected model
Isobars: Add the isobars layer on top of the selected forecast with option under menu
Interactive map: Zoom in and out and move the map to any area of interest.
Point of interest: Clicking on any point on the area covered by the forecasting model, will provide a quick view of the forecast value on the selected point. Clicking on the orange arrow on the tip, will open a summary of the forecast for the whole forecasting period for this point.
City labels: Clicking on city labels, opens a summary of the forecast for the whole forecasting period for the specific city.
User location: If location trace is permitted, select on location pin on the right side of the screen to view forecast on your current location.
Date time section: Select a specific date time within the forecasting period or animate the forecasts automatically by clicking on the play button next to the time selector.
Help guide: Press the exclamation mark on the right of the screen to open the short guide.
UTC and local time options. English and Greek languages.
Vertical and Horizontal view enabled.
No advertisements.
What's new in 1.2.0
Change of target SDK for Android 15