RoastWeather

Home coffee roaster? Get today's charge temp adjustment from local weather. Timing estimates for Behmor, Hottop, Kaleido, and Aillio Bullet.

Same beans, same roaster, a different cup every season? That's not your technique — it's your weather.

RoastWeather calculates today's charge temperature adjustment for your home roaster based on local ambient conditions. Ambient temperature, absolute humidity, and barometric pressure all change how heat transfers to your beans — and change how they should be roasted.

HOW IT WORKS

1. Select your roaster — Behmor, Hottop, Kaleido, Aillio Bullet, Huky 500, or Custom with your own baseline.
2. RoastWeather checks your local temperature, humidity, and barometric pressure from a public weather source.
3. You get today's recommended charge temperature, phase timing estimates (drying end, first crack window, development target), and heat guidance.

It takes 20 seconds to set up. No account required.

TODAY'S CHARGE TEMPERATURE See your recommended charge temperature for today, adjusted from your roaster's baseline by ambient temperature, absolute humidity (calculated from dew point), and barometric pressure. Each adjustment is shown as a breakdown so you can see why.

PHASE TIMING ESTIMATES Drying end, first crack window, and development time target — adjusted for your batch size and today's ambient conditions.

HEAT AND AIRFLOW GUIDANCE Cross-effect warnings (cold and dry, hot and humid, and more) with specific heat and airflow recommendations for the conditions you're roasting in.

Upgrade to Pro for deeper planning:

• 7-day roast planning forecast — see which day this week gives the most stable conditions
• Up to 5 roaster profiles for multi-machine households
• Unlimited batch log with full ambient snapshots
• Cross-roast comparison — compare the same beans roasted in different weather
• Green bean storage humidity tracker with 48-hour ambient trend
• Bean pre-acclimation alerts — know when to pull beans from storage early
• Multi-origin bean profile library

Start with a 7-day free trial. Then $4.99/month, auto-renewing. Cancel anytime from your Apple subscription settings before the trial ends — no charge.

PRIVACY FIRST

• All roast data stored locally on your device
• No account, no login, no tracking
• Location is used solely to fetch weather data from Open-Meteo
• Coordinates are never stored on any server we operate

This app provides roasting adjustment estimates based on thermodynamic principles and community practice. It is not a substitute for hands-on observation of your roast curve or the judgment of an experienced roaster. Always monitor your roast and adjust to your machine's behavior.

Weather data provided by Open-Meteo.com (CC BY 4.0).

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/