Weathergraph

Here's a quick guide to reading the weather chart:

How to Read the Charts

Day/Night Sky and Sunshine: The chart background shows the day/night cycle and sunshine intensity—the brighter the background, the sunnier it is.

Cloudiness: The top layer shows cloud cover (percentage of sky obscured by clouds).

Sun Glow: A warm glow above the cloud layer highlights especially sunny periods.

Wind Speed and Direction: The taller the chart, the stronger the wind. Arrows indicate wind direction; double arrows indicate gusts.

Temperature: The main colored chart shows temperature (actual or "feels like," based on your preferences). The dashed line marks the freezing point (0 °C / 32 °F).

Rain/Snow and Precipitation Probability: The bar chart shows precipitation amount (blue = rain, white = snow), while the light blue area shows precipitation probability (0–100%).

Humidity or Dew Point: You can display relative humidity (RH) or dew point as a blue dotted line. This also shows the dew point comfort level in forecast details. Humidity ranges from 0–100%, where two-thirds of the chart height equals 100%. Dew point shares the same scale as temperature.

Apple has made a great step-by-step guide to changing and customizing watchfaces.

Check out the Weathergraph watchfaces page for ready-made Apple Watch watchfaces featuring Weathergraph complications, ready to install with a single tap.

With Pro, Weathergraph checks for upcoming precipitation approximately every hour using short-range nowcast radar data.

If rain, sleet, or snow is detected in the forecast window ahead, you'll see a warning on the widget—including the expected start time and precipitation type.

When no specific precipitation is detected yet but the probability reaches 33% or higher, Weathergraph displays the chance instead.

Yes! The Pro version checks for upcoming rain or snow approximately every hour using short-range nowcast data, and alerts you when precipitation is on the way. Make sure Low Power mode is off on your iPhone and Apple Watch, as it disables background updates for all third-party apps.

The "dry" label comes from the dew point—not relative humidity. These two measures tell very different stories.

Why relative humidity misleads you

Relative humidity (RH) is a ratio: it compares the moisture actually in the air to the maximum that air could hold at its current temperature. The problem is that warm air can hold far more moisture than cold air. So the same absolute amount of water vapor reads as 98% RH at −1 °C, but only 40% RH at 25 °C.

What dew point actually measures

The dew point is the temperature at which air would need to cool to reach saturation. It's an absolute measure of how much water vapor is in the air—it doesn't change just because the temperature does. Cold winter air at −1 °C and 98% RH has a dew point of about −1 °C, which means only roughly 2–3 grams of water vapor per kilogram of air. That's genuinely dry—your skin and airways feel it. Heating that same air indoors to 21 °C drops the RH to around 20%, making it even drier.

Why it matters for how you feel

Your body cools itself by sweating. When the dew point is high, the air is already saturated with moisture and sweat can't evaporate efficiently—so you feel hot and sticky even if the temperature is moderate. The National Weather Service uses dew point (not RH) to classify mugginess for exactly this reason.

Here's the comfort scale Weathergraph uses:

If you would like to read more about how this works, Alex has a great article about why dew point is a more useful measure of humidity, especially for runners.

You can adjust how many days appear in the iOS widget by editing the widget settings on your home screen.

1. Long press the widget on the homescreen, select Edit Widget:

2. Tap Zoom and select the desired chart zoom level:

3. Get up to 7 days forecast at a glance:

You can adjust how many days appear in the watchOS widget by changing the Chart Zoom setting in the watchOS app preferences.

1. Scroll down to Preferences in the watchOS app:

2. Scroll down to the Widgets section:

3. In the Chart zoom setting, pick Week:

The result:

These widgets show the current temperature (or precipitation) plus the min/max range for the next 24 hours—not today's calendar day.

Why? Weather APIs only provide forecasts starting from "now." If today's coldest moment was at 6 AM and it's already noon, that data is gone—we can't show you a minimum that already happened.

I tried storing past minimums from earlier forecasts, but it got confusing quickly. Imagine driving through mountains and your widget shows "today's low: -5°C" from a mountain pass you crossed at dawn, even though it's 15°C where you are now. Not helpful!

The simpler, more useful approach: show what's coming in the next 24 hours. After all, you want to know if it'll get cold tonight—not what happened while you were sleeping.

This is a known iOS and watchOS bug where widgets stop updating. Technically, the widget system loses track of the file it uses to store widget data.

The reliable fix is to restart your device—either turn it off and back on, or use a force restart.

I reported this to Apple in iOS 17/watchOS 10. It reappeared (less frequently) in iOS 18.1/watchOS 11.1, and is significantly improved in iOS 18.2 and watchOS 11.2.

Please check Weathergraph's location permissions:

iPhone

1. Open Settings on your iPhone, go to Privacy & Security → Location Services → Weathergraph
2. Set the permission to Always (enables background updates and alerts) or at least While Using the App or Widgets (updates only when the system refreshes widgets)

Watch

1. Open Settings, scroll down and go to Privacy & Security → Location Services → Weathergraph
2. Set the permission to Always for background updates and alerts to work. If the options are grayed out, set the permission on your iPhone instead.

Make sure Low Power mode is off. When enabled, it disables background updates for all third-party apps, preventing Weathergraph from refreshing weather data.

If Low Power mode is already off, try restarting your device.

If the widgets still don't update, please send me the debug logs and we will look into what is happening - thank you!

Please check your location permissions in Settings → Weathergraph → Location.

If it's set to anything other than Always, please select Always.

Also make sure Low Power mode is off—it disables background updates for all third-party apps.

Please choose Allow While Using the App in the permission dialog. Weathergraph needs your location to show accurate weather (it's never shared with third parties—see our privacy policy). If you chose "Allow Once," the app will ask again each time.

To update permissions: open Settings → scroll to Weathergraph → tap Location → select While Using the App.

The Always location permission (needed for background complication updates) gets reset during iOS or watchOS updates.

Apple likely does this to prevent apps from tracking you indefinitely, but frequent minor security updates have been triggering this reset more often than intended.

I've suggested to Apple (rdar://FB9733269) that this should only happen with major updates (e.g., 8.0, 8.1), not minor security patches—but for now, it affects all updates.

If you swipe apps away from the task switcher on iOS or quit apps on Mac, they can no longer update in the background until you open them again.

Please keep Weathergraph running—it's designed to use minimal resources.

This is a rare issue in iOS 17 and watchOS 10 that appears to be fixed in iOS 18 and watchOS 11. If you're on an older version, updating your device should resolve it.

Restarting your device can also fix this issue.

This is caused by Apple's migration to a newer watch app format—something developers have little control over. The Apple developer forum thread explains the technical details, but essentially the migration sometimes caches the wrong app extension identifier, breaking complications.

Solution: Remove all Weathergraph complications from all watch faces at once (this forces watchOS to clear its cached complication data), then add them back.

If you find a better workaround, I'd love to hear about it!

On the iPhone and Mac:

1. Go to Preferences → scroll down → tap Debug
2. Tap Upload logs
3. Send the 5-digit code that appears to support@tomaskafka.com

On the watch:

1. Scroll to the bottom of the app and tap the gray version text
2. On the debug screen, tap Upload logs
3. Send the 5-digit code that appears to support@tomaskafka.com

Thank you!

On the iPhone:

Tap the Preference button (bottom right) → tap Get Pro or Manage purchases → tap Restore purchases.

On the watch:

Scroll down in the app → tap Get Pro → tap Restore purchases.

Go to Settings → [your name] → Subscriptions → select Weathergraph and choose your preferred plan. Here is Apple's guide.

1. Cancel the existing subscription first: Go to Settings → [your name] → Subscriptions → select Weathergraph → cancel the subscription (see Apple's guide).
2. In Weathergraph's Manage my subscription screen: Select the Forever option and confirm.

Here is Apple's guide: Manage App Store purchases, subscriptions, settings, and restrictions on iPhone

Quick steps:

1. Open the App Store on your iPhone
2. Tap your profile icon (top right) → Subscriptions
3. View, change, or cancel any active or expired subscriptions

If your subscription appears but Pro features aren't working:

Open Weathergraph → scroll down → tap Check Pro → scroll down → tap Restore Purchases.

No problem! Here's Apple's guide to requesting refunds.

Developers can't issue refunds directly, but Apple's process is quick and requests are usually approved promptly.

If you have a moment, I'd appreciate a quick email at support@tomaskafka.com letting me know what didn't work for you—it helps me improve Weathergraph. Thank you!

Family Sharing isn't available because subscription revenue covers weather data costs. While sharing between two people would be fine, Apple families can include up to six people with multiple devices each (watches, phones, tablets, Macs). With regular background updates for widgets and complications, data costs could easily exceed subscription revenue.

Moodistory has a great simple guide.

After redeeming, open Weathergraph on your iPhone, Mac, or iPad → go to the payment screen → scroll down → tap Restore Purchases.

Apple Watch purchases sync automatically when near your iPhone—no need to restore on the watch.

If restore fails on Mac, try deleting and reinstalling Weathergraph.

Yes! With Pro, you can save any number of named locations and switch between them with a tap. Saved locations can be renamed, reordered, and deleted from the Manage Locations screen.

One thing to keep in mind: widgets and complications always show weather for your current GPS location, regardless of which saved location is selected in the app.

Not yet, but government weather alerts are on the roadmap.

Air quality is on the roadmap. I already have data sources lined up and plan to add this feature.

It's complicated due to Apple's current limitations.

Live Activities can only be started when the app is open. For example, Uber can start one when you request a ride, but apps can't start them from the background.

The ideal scenario—Weathergraph automatically starting a Live Activity when rain is approaching—isn't possible under current rules.

A workaround would be sending a notification asking you to open the app, which then starts the Live Activity—but that feels too clunky.

If Apple enables background-initiated Live Activities, I'll revisit this. Until then, I'm focusing on other high-priority features.

I'd love to add more languages! The forecast text engine is currently built around English grammar. Making it language-agnostic is planned but will take significant effort.

Not in the near term. Radar data is significantly more expensive than forecast data, and the existing Rainbow.ai nowcast source is already using a dense worldwide array of weather radars to provide high-resolution precipitation tracking.

I have also added a link that opens webview with local radar apps.

Weathergraph is available on the Apple App Store for iPhone, iPad, Apple Watch, and Mac.

Weathergraph stands out with:

1. Hour-by-hour graphical forecasts showing up to 7 days in a single dense chart
2. Best-in-class Apple Watch support with rich complications
3. Multiple premium weather sources including Foreca, Apple Weather, Open-Meteo, Pirate Weather, and NWS
4. Nowcast radar with 30-minute updates
5. Strong privacy focus with no tracking or data harvesting

Yes, many former Dark Sky users now use Weathergraph as their primary weather app. It offers similar strip-style hour-by-hour forecasts with graphs, plus more power, customization, serious Apple Watch support, and privacy focus.

Weathergraph Pro uses premium sources including: Foreca (with nowcast radar), Apple Weather, Open-Meteo, Pirate Weather (US/Canada), and NWS (US federal data). Users can choose which source works best for their region.

Weathergraph never stores personal data, IP addresses, or exact locations. All requests are anonymized through Weathergraph's servers, and locations are rounded to protect privacy. There are no ads and no tracking.

Absolutely! Here are the resources:

• Weathergraph press kit
• Press media and screenshots

I'd love to hear from you! Reach out at support@tomaskafka.com.