Step by step
- Open the converter on this page with Celsius (°C) in From and Fahrenheit (°F) in To.
- Type 18 or any weather temperature from the forecast into the Value box.
- Read the Fahrenheit result and the formula (°F = °C × 9/5 + 32) right below.
- Press Swap units if you are reading a US forecast in °F and need °C.
At a glance
| Celsius | Fahrenheit | How it feels |
|---|---|---|
| 15 °C | 59 °F | Cool, light sweater weather |
| 18 °C | 64.4 °F | Mild, light jacket weather |
| 20 °C | 68 °F | Comfortable room temperature |
| 25 °C | 77 °F | Warm, pleasant summer day |
| 30 °C | 86 °F | Hot, sunscreen and shade weather |
Related questions
What is 18 Celsius to Fahrenheit?
18 °C equals 64.4 °F using the formula 18 × 1.8 + 32. For a quick mental estimate, double 18 and add 30 to get 66 °F.
What is 15 Celsius in Fahrenheit?
15 °C is 59 °F. That is a brisk spring or autumn day where a light jacket or sweater is usually enough.
How do I convert 25 °C to °F?
Multiply 25 by 1.8 to get 45, then add 32 for 77 °F. You can also type 25 into the Celsius box above for an instant answer.
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Updated November 14, 2026.