Forecasts that read like a sentence.
Every hour, day and week comes with a plain-English summary, so you don't have to decode a row of icons.
Next hour
Launching first on the web
Know when the rain starts. To the minute.
Rainfolio reads live NOAA radar every two minutes and tells you, in plain English, what the sky will do over the next hour, the next two days and the week ahead. Built for a glance, not a scroll.
Brooklyn, NY
Radar
58°
Overcast · Feels like 55°
- Radar refresh
- 2 min
- Frames served
- ~61 s after the scan
- Every forecast response
- under 0.7 s
- Map timeline
- 49 hours
Our own radar nowcast
The next hour, read straight from the radar.
Most apps license a minute-by-minute forecast from someone else. We build ours from raw NOAA MRMS radar, the national 1 km composite, the way Dark Sky did. Every two minutes, for every point we cover.
Radar · now
Rain or snow, minute by minute. Each minute carries radar's precipitation type, so “snow starting in 8 min” means snow.
Blended, not bolted on. Radar leads the first minutes, then hands over gradually to the forecast model by the end of the hour.
Always labelled. Every next-hour forecast says whether it came from radar or the model. Today radar covers the US and southern Canada; everywhere else gets the model.
Accuracy, in public
We grade our own homework.
Our radar service scores every nowcast against what NOAA measured afterwards, frame by frame, all day. The bar to clear is persistence: assuming the rain stays exactly where it is now. Plenty of forecasts struggle to beat it.
+28%
better than persistence at 60 minutes ahead
Critical Success Index (CSI): of all the places where rain was forecast or fell, the share we called correctly. 1.0 is perfect. Measured 29 Oct 2026 against NOAA MRMS PrecipRate.
Show as table
| Lead time | Rainfolio | Persistence | Gain |
|---|---|---|---|
| +10 min | 0.69 | 0.63 | +10% |
| +30 min | 0.55 | 0.44 | +25% |
| +60 min | 0.46 | 0.36 | +28% |
What's inside
Everything you check the weather for. Nothing you don't.
Honest daily icons.
A 10% chance of a passing shower won't paint your whole Saturday as rain.
Typical app
Sat
Rain all day
Rainfolio
Sat
Partly cloudy, 10% shower
A map that runs from two hours ago to two days ahead.
Scrub from past radar into 47 hours of forecast on one timeline. Layer on temperature, wind, clouds and more, with wind that actually moves. Play it back at anything from half speed to 10×.
Confidence you can see.
Solid bars are likely. Faint ones are possible. You can see the uncertainty without reading a percentage.
Severe alerts, cleaned up.
Alerts from the National Weather Service and Environment Canada, in one readable format, with the warned area drawn on the map.
Severe Thunderstorm Warning
Fast. Every time.
Your last forecast is on screen the moment you open the app, and a fresh one arrives in under 0.7 seconds.
Forecast response< 0.7 s
App download on first visit~80 KB
Auto-refreshevery 10 min
How we're different
A weather app with nothing to hide.
Weather apps have drifted toward autoplay video, ads and ten-day guesses dressed up as certainty. We're going the other way.
Feature
Rainfolio
Typical weather app
Next-hour rain
Our own nowcast from live radar, every 2 min
Licensed from a vendor, or hourly only
Accuracy
Scored continuously and published
Rarely published
Where the forecast came from
Every next hour says “radar” or “model”
Not shown
Summaries
Plain English for the hour, day and week
Icons and numbers to decode
Daily icons
Reflect the whole day, not its worst hour
One stray shower means “rain” all day
Map
Radar to +47h forecast on one timeline, with 6 weather overlays
A radar loop and a few hours of forecast
Ads and autoplay video
None. We're paid by subscribers, not advertisers.
Common
For developers and businesses
The same API the app runs on (planned)
A separate, enterprise-priced product
API-first
The same API the app runs on.
Rainfolio is an API with an app on top. The commercial plan will open it up: current conditions, the next hour minute by minute, hourly data through day 7, alerts, map grids and radar tiles, with summaries already written.
- Data you're allowed to build on. Our core runs on public-domain NOAA data and openly licensed models, so we can license it to you.
- One shape, any provider. We clean up the upstream data so your integration never changes when a source does.
- Documented. OpenAPI spec and interactive docs from day one.
{
"current": { "summary": "Overcast", "temperature": 58 },
"nextHour": {
"source": "radar",
"summary": "Light rain starting in 14 min.",
"points": [
{ "precipIntensity": 0, "precipProbability": 4 },
{ "precipIntensity": 0.02, "precipProbability": 71 },
… 61 minutes
]
},
"daily": {
"summary": "Rain on Thursday and Friday, with high temperatures peaking at 72° on Monday."
}
}Where we're headed
Web first. Your pocket next.
Here's what we're building first, and what we're exploring after that.
-
Launch
Rainfolio for the web
- Minute-by-minute radar nowcast
- Hourly through day 7 and a 7-day outlook
- Radar and forecast map with overlays
- Severe weather alerts for the US and Canada
-
Next
iOS and Android
- “Rain starting soon” notifications
- Home and lock screen widgets
- Saved places that sync across devices
- Severe alerts that reach you, not just your feed
-
Then
Rainfolio plans
- Personal: the full app, everywhere you are
- Commercial: licensed for business use
- Rainfolio API for developers
- Higher limits and more locations for teams
-
Exploring
Further out
- Live lightning
- Nearby weather stations
- Minute-by-minute radar beyond North America
- Higher-resolution global forecasts
Rainfolio is coming soon.
Minute-by-minute rain, plain-English forecasts and a map that runs from two hours ago to two days ahead. Launching first on the web.