Whether you’re racing, cruising, day sailing, you need precise sailing forecasts and real-time wind. SailFlow delivers both.
Powered by 90,000+ exclusive Tempest Weather Stations and 150,000+ total sources, SailFlow’s weather and wind app delivers unmatched accuracy. With stations on buoys, piers, and key waterfront locations, you get real conditions exactly where you sail.
Plan with confidence using our Tempest Rapid Refresh Model combined with government data to deliver industry-leading Nearcast AI predictions. Then go deeper with radar, high-resolution forecast maps, and fully customizable alerts so you never miss a session.
Real wind. Better sails.
- Coastal observations from proprietary Tempest Weather Systems along with all public domain marine forecasts and reports (NOAA, NWS, METAR, ASOS, CWOP) including all major airports creating over 150,000 unique stations.
- Exclusive Tempest Weather Systems deployed at key coastal locations report wind, rain, barometric pressure and more than 24 other weather observations.
- Apple Watch compatibility
- Live wind from our stations support powerful wind flow visualization – augmented by current station reports with advanced quality control.
- Our Proprietary AI-enhanced Nearcast provides enhanced forecasting for temperature, wind gust, speed, direction, humidity, dewpoint, precipitation rate, probability of precipitation, and cloud cover percentage which is perfect for sailing.
- Public domain forecast models including High Resolution Rapid Refresh (HRRR), North American Mesoscale Forecast System (NAM), Global Forecast System (GFS), Canadian Meteorological Centre Model (CMC) and Icosahedral Non Hydrostatic Model (ICON).
- Create your own favorite station list to keep an eye on your go-to weather stations at all your marine and sailing spots. Check the tides in minutes so you never miss a day on the water.
- Maps: Live and Forecasted Wind Map, Forecasted Temperature, Radar, Satellite, Precipitation and Clouds, as well as Nautical Charts.
- Free subscription for unlimited wind notifications/alerts with customizable thresholds to email, text, or in-app.
- Monitor National Weather Service (NWS) Marine forecasts, high surf warnings, and other to better anticipate waves and current conditions, for safer, more informed decisions on the water.
Additional weather parameters:
- Tides charts
- Wave height, wave period
- Water temperature
- Sunrise / sunset
- Moonrise / moonset
- Historical wind statistics
- Windy days per month
- Wind direction distribution
Go Beyond the Basics: Upgrade to Plus, Pro, or Gold membership to gain access to more weather stations, ad-free browsing, and more.
- Access exclusive Pro and hurricane-proof stations at premier coastal locations and unlock SailFlow’s hyper-accurate Pro forecasts, updated daily by expert meteorologists for sailing hotspots coast to coast.
- Detailed weather at points of interest to coastal residents and property owners near the ocean, rivers, and other bodies of water.
On the water features:
- Sea surface temperatures
- Sea surface currents
- Detailed historical wind statistics
- Historical wind speed average by year
Does your spot need a station? Join the Tempest Weather Network!
Get a Tempest Weather System for your club, dock, or backyard.
Get support: help.weatherflow.com/hc/en-us/categories/200419268-iKitesurf-iWindsurf-SailFlow-FishWeather-WindAlert
Connect with Tempest:
- facebook.com/tempestwx
- twitter.com/tempest_wx
- youtube.com/@tempestwx
- instagram.com/tempest.earth
Contact Tempest: help.weatherflow.com/hc/en-us/requests/new
Website: tempest.earth
By purchasing a subscription or downloading SailFlow you agree that you have read and accept our Privacy Policy and Terms of Use.
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For the past five months, I’ve been sailing roughly 20 days each month. I have used SailFlow for more than ten years, and it has proven to be extremely helpful. The app consistently provides all the crucial weather information I need — including detailed sea state data — making each voyage safer and more predictable.While many of my crewmates rely on other weather apps (which I’ve tried in the past), SailFlow stands out by continually embracing new technology and data as they become available. This commitment to innovation keeps the app a step ahead of the competition and solidifies its place as my go-to choice for reliable sailing forecasts. SailFlow’s continuous improvements underscore its value as an essential companion for any serious sailor.
Direction arrow is still wrong!
Truthteller863839
Update#2: [My comments] The developer responded, saying “ Wind direction is always reported on where the winds are coming from. [Yes, a SW wind comes FROM the SW and goes TO the NE] The arrow vectors show the direction of the flow [I.e. the arrow points TO the wind’s destination, not its origin] , they are not meant to be wind barbs. A North wind means winds are coming from the north, a conventional 'wind barb' will point into the wind, North, and a wind vector will be aligned with the tip pointing south."[They proved that their arrow vectors point in the direction the wind is flowing TO, not the direction it’s coming FROM. I’m just asking that they fix their app to say Direction To rather than Direction From, not changing anything but the text. Keep the arrows pointing as they are, just label them correctly!!]Update: this issue is still broken. It should be a simple fix, and contrary to the reply from SF, it’s not a matter of opinion, it’s the truth! It’s a confusing error and should be fixed ASAP. ************************ In general the app works well, but there’s a problem with the Observed wind direction shown on the Wind Graph page. It’s pointed in the right direction, but it’s labeled wrong!! It’s labeled in the key as “Direction From” when it’s actually the direction the wind is flowing to, not from. I’ve emailed the developers directly but they’ve never corrected it. I know it’s a small detail in an otherwise useful app, but it seems like an easy fix to remove any confusion.
Developer Response
Hi TT, following up again, the app and website have been updated to correct what you are referring to. We would really appreciate it if you could update your review. We don't think it's fair to give a 1 star review from this minor detail that we nonetheless spent time fixing. Thanks for helping make the app better.
Love this FREE app
RHTerrapin
I use this app all the time with no problems. We used it to travel the ICW Atlantic this fall and it was our guide to our travel plans each day. Only reason I am giving it 4 stars is that on my iPhone (iPhone 6s) it displays the map and locations making it easy to use. When my husband loads the app on his iPhone 8 we cannot get the map to appear, even though we compared all our settings to ensure we were the same. He has the latest iOS loaded so not sure if it is an issue with the iPhone 8?Would highly recommend this easy to use app and hope to get it working on the iPhone 8 with a Street / Wind map like it does on my iPhone 6s.
Developer Response
Hi RH. On your iPhone 8, you may have cellular data turned Off for SailFlow! On your iPhone, try going to the phone's Settings app. Tap Cellular. Scroll down to SailFlow and make sure cellular data is ON for SailFlow. You can also contact us at support@sailflow.com
Unable to use favorites list
moomoodles
I used to love this app. However, it has become less user friendly over the years. Stations that have favorited no longer show up in my favorites list and every time I click on the station where I sail, I get a pop-up telling me to “favorite” the station… but I “favorited” it years ago, and last week, and again this week. After looking around the app to find my favorites again, I found them under the “Master Profile” option in the favorites tab. However, it is now an unusable menu because every time I click on a station, it asks me to upgrade my account or sign in. I am already signed in on the app with my free account. If I find the station I’m looking for on the map, I can still access the blend models of plus/pro stations. Why can’t I access these same pro/plus stations from my favorites list now with a free account?
Developer Response
SailFlow support can help you with these issues you're having, moomoodles. Give us a shout: Main Menu > Settings & Help > Contact Us.
Navigate faster with streamlined access to your go-to spots, enhanced search, and a more immersive full-screen map. Enjoy a cleaner, ad-free experience with Plus, Pro and Gold memberships, smarter Pro forecasts, improved organization, and clearer, more intuitive views.
Version 7.0
The developer, WeatherFlow, 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:
Diagnostics
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Information
Seller
WeatherFlow
Size
141 MB
Category
Weather
Compatibility
Requires iOS 13.0 or later.
iPhone Requires iOS 13.0 or later.
iPad Requires iPadOS 13.0 or later.
iPod touch Requires iOS 13.0 or later.
Mac Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.