A weather watchface for the Pebble Time 2, with hyperlocal precipitation at its heart — plus a companion app for detailed forecasts. Built in C on PebbleOS.
Watchface — glanceable, themeable, always-on:
- Big steady clock (12/24h), date, battery, and step count
- Current temperature, today's high, and a condition icon (12-glyph set)
- A 2-hour hyperlocal precipitation strip + a live "rain in N min" countdown — the headline feature
- A "stale" cue when the phone hasn't refreshed the forecast recently
Companion app (PebbleSky Detail) — opened via Quick Launch, cycled with
Up/Down (Back exits):
- 2-hour precip detail — bars, countdown, probability, intensity scale
- 5-day forecast — per-day icon + hi/lo range bars
- Now — temperature, feels-like, wind, humidity, last-updated
Configurable (via Clay):
- Weather provider: Open-Meteo (free, no key) or Tomorrow.io (API key)
- Units (°F/°C), clock (12/24h), date order (M/D · D/M)
- Accent and rain-warning colors
A 2-hour nowcast goes stale fast if you just freeze it at fetch time. Instead,
the phone over-fetches a 4-hour buffer of 15-minute precip buckets plus an
anchor timestamp, and the watch slides a 2-hour window over that buffer
every minute, recomputing the "now" marker and the countdown against the
real clock. So RAIN IN 20M ticks down to 5M on its own, with no new fetch;
the underlying forecast refreshes about every 30 minutes.
src/c/PebbleSky.c the watchface
src/pkjs/ watchface PebbleKit JS (weather + Clay config)
shared/pebblesky_render.h shared icon set + precip bars (used by both apps)
companion/ the companion watchapp (its own project)
resources/fonts/ Archivo (OFL)
design/ the original design handoff
The watchface and companion are two separate Pebble apps (a watchface can't take button input, so the detail screens live in a button-driven app). They each fetch their own forecast and are configured independently.
Requires the Pebble SDK / pebble-tool. Targets emery (Pebble Time 2).
# watchface
pebble build
# companion
cd companion && pebble package install @rebble/clay && pebble buildPreview in the emulator:
pebble install --emulator emery
pebble screenshotBuild each project, then sideload the resulting .pbw (in build/) through the
Pebble/Core app on your phone. Set the watchface active, and bind Quick Launch
(long-press Up or Down) to PebbleSky Detail to open the companion from the face.
In the Pebble/Core app, open each app's Settings to reach its Clay config page. For Tomorrow.io, select it as the provider and paste your API key. (The two apps don't share settings, so set them in both if you want parity.)
- Type: Archivo by Omnibus-Type (OFL)
- Weather: Open-Meteo · Tomorrow.io
- Config: Clay
- Built on PebbleOS / pebble-tool
MIT © Dave Bortz