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Thermo Diem: Feels Like Temp

Thermo Diem: Feels Like Temp

Is it warmer than yesterday?

4 ratings
20 reviews
🔧 Utilities
☀️ Weather
Free

Details

Released
October 14, 2014
Updated
October 20, 2026

Features

Developer

Basic Function
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Thermo Diem: Feels Like Temp video #1 for iPhone
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About

This app compares current "feels like" temperatures to the previous day, offering a relative sense of warmth or coolness. It provides seven simple daily comparisons to help you understand how the weather feels.

✓Compares today's 'feels like' temperature to yesterday
✓Provides 7 relative temperature descriptions
✓Considers humidity, wind, dew points, and temperature
✓Designed for Apple Watch
✓Uses Forecast.io data
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+1

What's New in Thermo Diem

3.8

October 20, 2026

What’s New • Native support for iPhone Duo, with adaptive layouts for expanded, folded, and tabletop use • Refresh button added to widgets • Faster, more reliable widget updates throughout the day and overnight. • New Apple Watch complications and refreshed watch-face designs • Improved CarPlay widgets and Live Activity presentation • More consistent weather comparisons across iPhone, Apple Watch, widgets, and CarPlay • Clearer handling when historical comparison data is unavailable • Refined typography, layouts, localization, and accessibility • Performance improvements and general optimizations • Bug fixes and reliability improvements

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User reviews

Most RecentHighest RatedLowest Rated

Good concept, but often wrong

I like the idea of this app a lot but to give an example of how completely wrong this app can be, right now the feels like temp is 70°F and when I compare with tomorrow it says it will feel much cooler tomorrow. The feels like temp at this time tomorrow it says? 70°F. Hmm. If the dev can fix this app it would be great, but it’s been around a long time and yet it’s so entirely wrong still? That doesn’t give me a lot of hope.
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CCrunchewy

Response from developer

Thanks for pointing this out, you were right. We found an issue where the tomorrow comparison could show today’s temperature alongside tomorrow’s warmer/cooler verdict, making the result appear contradictory. We’ve fixed it and added testing to prevent it from happening again. We appreciate the clear example and hope you’ll give the update another try. The fix will be up in version 3.7 coming out very soon. Please send any and all bug reports to thermodiem@gmail.com or leave a message on X and we'll address them ASAP! Thanks - Mickey (Lead Dev)

Widget not current

After I click on widget, only then it updates to the current weather. This defeats the purpose of being able to glance at the widget and have current information.
JJambalayafjjdch

Response from developer

Thanks for reporting this. I tracked down the stale widget behavior and made some changes since this review was posted. The widget now updates its displayed weather every hour and fetches fresh weather data in the background more often, without needing the app to be opened first. iOS still controls the exact timing of background updates, but this should be much more reliable now. Look for version 3.6.1 coming any day now. Thanks - Mickey (Lead Dev)

Julia

I love this app I really recommend it for people who are on the go because it is easy to see it right away and compare today and the next days temps guys get it!!!!!😭🙏
JJjhhhyyuisnis

3.2 is a Game Changer

Works on all of your devices
MMickeyDeLo

apparently 90 is cooler than 78

For a while this app would always say “today is warmer” I kind of forgot about it until a couple days ago. The high was 78. The next day was in the mid 90s, yet the app kept saying “today is cooler”
LLindsbear19
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FAQ

What does Thermo Diem compare?

Thermo Diem compares today's 'feels like' temperature to how it felt 24 hours ago. It takes into account factors like relative humidity, wind, dew points, and temperature to provide a relative sense of warmth or coolness.

How does Thermo Diem describe the temperature changes?

Thermo Diem provides seven simple outputs: Much Warmer, Warmer, Slightly Warmer, Similar, Slightly Cooler, Cooler, and Much Cooler. This offers a quick, relative understanding of the day's weather feel.

What data source does Thermo Diem use?

Thermo Diem utilizes data provided by Forecast.io, which is described as a highly accurate weather reporting service.

Is Thermo Diem available on other devices besides Apple Watch?

The description specifically highlights that Thermo Diem is designed for the Apple Watch, suggesting it is optimized for or primarily available on that platform.

What is the formula used by Thermo Diem?

Thermo Diem uses the formula AT = -2.7 + 1.04*T + 2.0*e -0.65*v, where AT and T are in degrees Celsius, e is vapor pressure in kPa, and v is 10m wind speed in m/sec.

How often is Thermo Diem updated?

The latest version, 2.1, was released on June 4, 2015. This indicates that updates may not be very frequent, with the last update being several years ago.

What is the user rating for Thermo Diem?

Thermo Diem has a rating of 1.5 stars based on 6 ratings. This suggests a generally negative user sentiment based on the limited feedback available.

Does Thermo Diem have ads?

The provided data does not specify whether Thermo Diem contains advertisements. However, it is a free application, which sometimes correlates with ad support.