Guide
What US weather forecasts in °F feel like in °C: a guide
US forecasts, thermostats, and oven dials all speak Fahrenheit. Here's a quick reference to translate them into what you actually feel.
By Buğra SözeriPublished
Checking a US weather app when you think in Celsius means translating every number on the way in. “90 degrees and sunny” sounds mild until you realize it's 32°C; “it's going down to 40 tonight” sounds alarming until you realize that's a mild 4.4°C, not below freezing. This is a quick reference for the Fahrenheit numbers you'll actually see in a US forecast, what they mean in Celsius, and roughly what to wear.
US weather forecast reference table
| Fahrenheit | Celsius | What it feels like |
|---|---|---|
| 100°F | 37.8°C | Dangerous heat; heat advisories common |
| 90°F | 32.2°C | Hot; shade and hydration weather |
| 80°F | 26.7°C | Warm, beach-day territory |
| 70°F | 21.1°C | Comfortable, mild — a typical indoor thermostat setting |
| 60°F | 15.6°C | Cool; light jacket weather |
| 50°F | 10.0°C | Cold; a real coat |
| 32°F | 0.0°C | Freezing — water turns to ice |
| 0°F | -17.8°C | Severe cold; frostbite risk with prolonged exposure |
The exact conversion behind every row is °C = (°F − 32) × 5/9. For anything outside this table, our Celsius to Fahrenheit converter handles both directions exactly.
The numbers that actually matter for planning
A few thresholds are worth memorizing rather than recalculating every time. 32°F is freezing — anything reported below that means ice is a real possibility. 90°F and aboveis when US weather services start issuing heat advisories in humid regions, since humidity makes the same air temperature feel considerably hotter (the “heat index” the National Weather Service reports separately). And 68–72°Fis the range most US homes and offices set their thermostats to, which is a useful anchor for “what does indoor-comfortable feel like in this scale.”
Reading an oven dial, not just a forecast
The same translation problem shows up on US kitchen appliances: ovens are dialed in °F, and a recipe written for a Celsius oven won't mean anything on one until it's converted. If you're working from an imported recipe on a US oven or vice versa, the Celsius vs Fahrenheit comparison page covers where each scale shows up — weather, cooking, medicine — and how they relate beyond just the weather report.
A faster way to estimate on the fly
If you don't want to look anything up, our mental math trick guide covers a quick doubling shortcut that gets close enough for weather-app purposes in a couple of seconds — accurate to within a couple of degrees across the everyday range this table covers.
Frequently asked questions
- What is 90°F in Celsius?
- 90°F is 32.2°C — a genuinely hot day, the kind where US weather services start issuing heat advisories in humid regions. Using °C = (°F − 32) × 5/9: (90 − 32) × 5/9 = 58 × 5/9 ≈ 32.2°C.
- What is 70°F in Celsius, and is that warm?
- 70°F is 21.1°C, generally considered a comfortable mild day — similar to a pleasant spring or autumn afternoon in a temperate climate. It's also a common indoor thermostat setting in the US.
- What Fahrenheit temperature is freezing?
- 32°F is freezing (0°C), the temperature at which water freezes at standard atmospheric pressure. A US forecast quoting temperatures in the low 30s°F means conditions are right around or just above freezing.
- Why do US weather reports use Fahrenheit instead of Celsius?
- The United States never completed a full switch to the metric system for everyday use, and Fahrenheit remains the public-facing convention for weather, in contrast to nearly every other country, which reports in Celsius. US scientific and military contexts do use Celsius; consumer weather reporting is one of the last major holdouts of the Fahrenheit convention.
Sources & references
Authoritative references cited by this piece. Verified by Buğra Sözeri on the dates shown and re-checked at every deploy.
- NOAA National Weather Service — Heat Index / extreme heat guidance — NWS reference on Fahrenheit heat thresholds used in US forecasts and advisories(as of )
- NIST — The International System of Units (SI) — NIST reference on SI units, including the Celsius scale(as of )
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Published September 25, 2026