Know Weather: Live Radar

Review by eFreeware

The thing that stands out about Know Weather is how often it refreshes: the developer says conditions update nearly every minute, which is a faster cadence than most forecast apps bother with. That alone tells you what kind of app this is. It is built for people who check the sky before deciding something, not for anyone who wants a forecast once a morning and nothing more.

The app is free and ad-supported, with no in-app purchases. That matters for a utility you might open several times a day, because the cost of using it is your attention rather than your wallet. With more than five million installs and a 4.4 average across nearly 17,000 ratings, it has clearly found an audience since its June 2024 release.

If you want a straightforward Android weather app that covers the basics thoroughly and warns you about dangerous conditions, this is the kind of tool worth considering. If you need something specialized, the sections below should help you judge whether the feature set lines up with how you actually use weather information.

What you get on opening it

At its core, Know Weather is a forecast app with three time horizons. You get hourly forecasts, a daily outlook and a weekly view, so you can look at the next few hours, plan tomorrow, or scan the week ahead. The developer also describes detailed local and global weather reports, which means the app is not limited to wherever you happen to be standing.

The 24-hour hourly forecast is the part I would lean on most. It gives you a running picture of conditions through the day rather than a single number, which is what you want when the morning and the evening look nothing alike. Pair that with the weekly view and you have a reasonable basis for deciding when to schedule something outdoors.

The framing throughout is practical: the app is pitched as a way to plan trips and daily errands with more confidence. That is a modest promise, and it matches what a forecast app can honestly deliver. Nothing here is trying to be a social network or a news feed.

The detail behind each forecast

Beyond the headline temperature, the app lists a set of measurements for the current day and the days ahead. That includes daily temperature, sunrise and sunset times, humidity levels, the UV index and wind reports. For anyone who gardens, runs, cycles or works outside, those are the numbers that decide whether a day is comfortable or miserable.

The UV index and wind reports are the two I would single out. UV is easy to underestimate on a mild, cloudy day, and wind changes how a temperature actually feels. Having both alongside humidity and daylight hours means you can assemble a fuller picture without opening several different tools.

This is the section of the app that rewards a bit of curiosity. If you only ever glance at the big number, you are leaving most of what the developer built on the table. The extra readings are there for the days when the difference between 68 and 72 degrees is not the whole story.

Alerts for dangerous conditions

The severe weather side is where Know Weather puts most of its emphasis. The developer describes hundreds of alert types and says the app notifies you of potential severe conditions as they develop. The list covers high temperatures, hurricanes, tornadoes, thunderstorms, blizzards, storms, floods and tsunamis, along with forest fires, radiation hazards and agriculture-related warnings.

What I find more useful than the alert itself is the accompanying guidance. Warnings are paired with disaster countermeasures, so a notification is meant to tell you what to do rather than just that something is coming. For households in regions prone to storms or flooding, that combination of warning and instruction is the strongest argument for installing it.

The breadth of the list is notable, though it also means the app is casting a wide net. Radiation hazards and agricultural warnings sit alongside tornado alerts, so the app covers a wide range of scenarios rather than being tailored to one climate. Whether that feels thorough or noisy will depend on where you live and how many of those categories apply to you.

Reading the radar map

The radar map gives you a visual layer on top of the numbers. It shows local and live radar information, with the ability to view the map under various conditions. That is the feature to open when you want to know whether a band of rain is heading your way or will pass to one side.

A radar view is not a replacement for the forecast, and it is not meant to be. It answers a narrower question: what is happening right now, and in which direction. Combined with the frequent refresh rate, it makes the app useful in the minutes before you leave the house, when a written forecast is too slow to be helpful.

The map is a way to see weather patterns in your area visually. If you think in pictures rather than numbers, this will probably be the screen you use most, with the hourly and weekly views filling in the longer-range planning.

What it asks of you

Know Weather is free to install and carries advertising. There are no in-app purchases, so the trade is straightforward: you get the full feature set without paying, and ads are part of the deal. For a free utility, that is a familiar arrangement, and it is worth knowing before you install rather than after.

The app is rated for Everyone and sits in the Weather category, which tells you it is aimed at a general audience rather than a professional or technical one. It was last updated in September 2026, so it is not sitting untouched.

The main thing to weigh is how much weather information you actually want. The app leans toward breadth: many alert categories, several measurement types, a radar view and forecasts at three time scales. If you want a single temperature reading and nothing else, there is more here than you need. If you want the fuller picture, the range is the point.

Who will get the most from it

The clearest fit is someone who lives somewhere the weather can turn dangerous. If hurricanes, floods, blizzards or wildfires are part of your yearly rhythm, an app that pushes alerts and pairs them with countermeasures is doing something a plain forecast cannot.

The second fit is anyone who plans their day around the sky. Cyclists, runners, gardeners, dog walkers and people who commute on foot all benefit from an hourly view and a radar map they can check in the minutes before heading out. The UV index and wind reports add value for anyone spending long stretches outdoors.

Travelers are a third group. The mention of global weather reports means you can look up conditions somewhere other than home, which is useful when you are deciding what to pack or whether an outdoor plan will hold. None of this requires expert knowledge; the app is pitched at ordinary use.

A free forecast app with an alert habit

Know Weather covers the ground a general-purpose weather app should cover, and it does so without charging for it. Hourly, daily and weekly forecasts, a live radar map, detailed readings for each day and a wide alert system make up a package that is broader than many free alternatives. The near-constant refresh rate is the detail that distinguishes it most.

The trade-offs are the ones the app itself implies. Ads come with the free download. The alert system is deliberately broad, which will be reassuring in some regions and excessive in others. And the app rewards a little engagement: if you never open the radar or the detail panel, you are using a fraction of what is there.

I would suggest this to anyone who wants a dependable daily forecast and a genuine early-warning system in one place, particularly in areas where severe weather is a real concern. For readers who only ever need a quick high and low, a simpler app will do. For everyone else, this is a reasonable free option to try.