Iustin Nita
Founder & Runner, RunWeather
Iustin Nita is the founder of RunWeather and the runner who built it. After one too many summer runs fell apart at temperatures that looked fine on paper, he built RunWeather to translate weather into running effort: a 0-100 Run Score, dew-point-first forecasting, best-window timing, and pace context grounded in running research. He writes the RunWeather blog on dew point, heat, humidity, and training in the conditions you actually get.
He built RunWeather to translate the forecast into a 0-100 Run Score, the best window to run, and pace context grounded in dew point and running research, free on iPhone and Android.
Articles by Iustin Nita
- Dew Point for Running: Why It Beats Humidity
Humidity misleads runners. Dew point measures the moisture that stops sweat from cooling you, which is why it predicts a hard run, plus the bands that matter.
- Best Time of Day to Run in Summer: Read the Dew Point, Not the Thermometer
The best summer run time depends on dew point, sun exposure, and heat stored in pavement, not the air temperature alone. Here is how I choose between a morning and an evening run, hour by hour.
- Dew Point Thresholds for Runners: The Full Chart
Comfortable below 55°F, oppressive at 65°F, dangerous past 70°F. The dew point bands that tell you when to slow down, shorten the run, or move indoors.
- How Much Slower Should You Run in Heat & Humidity?
How much to slow down in the heat, in real numbers: a few minutes on an easy run up to 15+ minutes on a hot marathon, plus when to run by effort not pace.
- Hydration and Sodium for Hot Runs: A Dew Point-First Plan That Avoids Overdrinking
Humidity changes sweat cooling, not just sweat amount. Build a simple fluids + sodium plan by dew point, duration, and effort, with safety-first limits.
- Treadmill vs Outdoor Running: A Decision Framework for Extreme Weather
Know when outdoor conditions are no longer productive and how to choose treadmill vs outside runs using weather thresholds.
- What to Wear Running in Heat and Humidity: A Dew Point-First Gear Guide
Choose running clothing by dew point, sun exposure, and airflow. Learn fabric and fit principles that improve cooling and reduce chafing in humid heat.