Thermo Diem

Name: Thermo Diem
Rating: 5 (1 reviews)
Author: Basic Function

Weather

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

1 Rating
Age Rating

4+
Years
Category

Weather
Developer

Basic Function
Language

EN
+ 3 More
Size

4.3
MB

Know instantly how today feels compared to yesterday. Bold typography, biometeorology, lock screen widgets, CarPlay, and Live Activities. Most weather apps give you numbers. Thermo Diem gives you context. A 72° day after a week of freezing cold feels completely different than 72° after a scorching heat wave. That’s because human comfort is relative — your physiology adapts to what you experienced yesterday. Thermo Diem compares current apparent temperature directly to yesterday, tomorrow, and future days of the week, answering the only question that matters when stepping outside: "How does today feel compared to yesterday?" THE SCIENCE OF APPARENT TEMPERATURE Ambient air temperature only tells half the story. Thermo Diem implements advanced biometeorological models (NOAA Wind Chill, Rothfusz Heat Index, and Steadman’s psychrometric heat balance) — calculating the thermodynamic balance between human skin and the surrounding atmosphere: • Vapor Pressure & Humidity: Accounts for evaporative cooling resistance. • Wind Velocity: Measures forced convective heat loss from exposed skin. • Direct Solar Radiation: Incorporates direct thermal gains from daylight and UV index. The result is true Apparent Temperature, evaluated directly against your recent baseline. 7 INTUITIVE SHIFTS Pure clarity with zero clutter: • Much Warmer • Warmer • A Little Warmer • About The Same • A Little Cooler • Cooler • Much Cooler TREND CURVES & FUTURE SHIFT See today’s feels-like trajectory overlaid directly on yesterday’s curve. Use the 7-day Future Shift dial to scrub ahead and compare any upcoming hour or day of the week against right now or yesterday's high. CARPLAY & COMMUTE LIVE ACTIVITIES Get temperature shift intelligence right on your car's dashboard. Thermo Diem brings real-time relative temperature and signature spectrum gauges to CarPlay Dashboard and Lock Screen Live Activities—keeping you informed before your commute begins. HOME & LOCK SCREEN WIDGETS Bring iconic poster typography to your Home Screen and Lock Screen. Choose from bold multi-line posters, split overview cards, or spectrum slider gauges. Long-press any widget to customize comparison targets and display details. STANDALONE APPLE WATCH APP Designed natively for your wrist. Check today's shift at a glance with rapid launch, custom watchOS complications (Corner, Circular, Rectangular, Inline), and independent background updates. NATIONWIDE MOVERS Curious where the biggest swings are happening? Explore 24-hour temperature movers across major climate regions nationwide. NOW IN 4 LANGUAGES Full native support for English, Spanish, French, and German. PRIVACY FIRST No tracking, no third-party ad networks, and no data harvesting. Just clean, honest weather intelligence.

Ratings & Reviews

5.0

out of 5

1 Ratings

3.2 is a Game Changer
2d ago
MickeyDeLo
Works on all of your devices
3.2 is a Game Changer
2d ago
MickeyDeLo

Works on all of your devices
The only weather report that matters
10/17/2014
billbejarano
The only reason to care about the weather is to figure out what to wear as opposed to what you wore yesterday. This app cuts through all the crap and tells you the only thing you need to know.
The only weather report that matters
10/17/2014
billbejarano

The only reason to care about the weather is to figure out what to wear as opposed to what you wore yesterday. This app cuts through all the crap and tells you the only thing you need to know.
Simple and good-looking app
10/15/2014
TanyaEvl
I like the idea of the app, and the style is clean and modern.
Simple and good-looking app
10/15/2014
TanyaEvl

I like the idea of the app, and the style is clean and modern.
Poor today widget and Watch extension
02/28/2016
iPravda
The today's notification widget and the actual app info is never aligned. Meaning the today widget will say "tomorrow will feel like today" and when you open the actual app it will say "tomorrow's will feel much cooler". This happens almost every time. Same issue with Watch extension. Simple app like this should be in sync.
Poor today widget and Watch extension
02/28/2016
iPravda

The today's notification widget and the actual app info is never aligned. Meaning the today widget will say "tomorrow will feel like today" and when you open the actual app it will say "tomorrow's will feel much cooler". This happens almost every time. Same issue with Watch extension. Simple app like this should be in sync.

What's new in 3.3: • Multi-Language Support: Thermo Diem is now fully localized in Spanish, French, and German! • Editorial Headline Grammar: Streamlined comparison phrasing with natural equative logic ("About the same as yesterday"). • Precision Weather Integrity: Enhanced data consistency across Home Screen widgets, Apple Watch complications, and CarPlay Live Activities. • Performance & Dynamic Type: Faster optical caching for instant font rendering.

Version 3.3 8h ago

Data Not Linked to You

The following data may be collected but it is not linked to your identity:
- Location

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

Information

Seller: Mickey DeLorenzo
Size: 4.3 MB
Category: Weather
Compatibility: Requires iOS 26.0 or later.

iPhone
Requires iOS 26.0 or later.

iPad
Requires iPadOS 26.0 or later.

Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 26.0 or later.

Apple Watch
Requires watchOS 26.0 or later.
Languages: English and 3 more

English, French, German, Spanish
Age Rating: 4+

4+

Learn More

Developer Website

Privacy Policy

Thermo Diem

Ratings & Reviews

3.2 is a Game Changer

The only weather report that matters

Simple and good-looking app

Poor today widget and Watch extension

What’s New

App Privacy

Data Not Linked to You

Accessibility

Information