How to choose the best time to run

The best time to run is the best practical window for your session, route and schedule. Morning is not automatically better than evening. Compare the hours you can actually use, then check conditions through the whole run rather than only at the starting minute.

Start with your available windows

Write down two or three realistic options: before work, a lunch break or after dinner, for example. Add the expected duration and route. A high-scoring hour that you cannot use is less helpful than a workable option you can prepare for.

For each option, compare temperature, feels-like temperature, dew point, wind, gusts, rain and daylight. Look at the finishing hour as well. A 90-minute session can pass through conditions that are different from the first hourly card.

Check the route's location. A city forecast is a useful starting point, but a coastal path, hill or inland route may need a more relevant forecast. WeatherToRun's city pages should not stand in for mountain or marine forecasts.

Compare conditions as a group

Imagine an afternoon at 77°F / 25°C and an evening at 66°F / 19°C. The lower temperature may help, but first check whether the evening adds a storm, stronger gusts or darkness on an unsuitable route. Moving later is a tradeoff to inspect, not a guaranteed improvement.

In muggy weather, compare dew point alongside temperature. In cold weather, add wind chill and footing. When rain is possible, inspect amount and conditions rather than reading chance as intensity. The humidity, cold-weather and rain guides explain those checks.

During hot weather, the CDC's guidance for athletes recommends choosing cooler parts of the day and changing the plan when necessary. That still requires looking at the forecast for the actual day and place.

Read the running score as a comparison

WeatherToRun's 0–100 score combines forecast inputs including apparent temperature, dew point, wind, precipitation and UV. The city summary uses the default profile; the interactive forecast can reflect your own acclimation preferences. This is why a personalised view can differ from a city summary.

Air quality and daylight need their own check: they do not change this weather score. Use the air-quality guide to read the local pollution advice and the darkness guide to check your route and visibility. A high weather score can still coincide with poor air quality or a route you cannot use after sunset.

The best-window summary identifies the highest-scoring upcoming forecast hour in the next 48 hours. It describes an hour, not a guaranteed clear interval for your entire run. Compare adjacent hours before using it for a longer session.

For a 90-minute run starting at 6:30, inspect the 6, 7 and 8 o'clock cards. The starting card does not describe the conditions you will finish in. The summary can include the current hour; it is not a reservation for a future dry slot.

A score is also not a safety clearance. The forecast may miss a local change, and the model cannot inspect your footing, traffic or physical condition. Official alerts and actual conditions take priority over a favourable score.

Keep a second plan ready

Pick an alternative before departure: a shorter loop, a later start or an indoor session. Make that alternative easy enough that you can use it without rebuilding your day. Recheck the latest forecast before committing to a long or exposed route.

If you hear thunder, shelter and wait rather than treating it as a minor rain adjustment. NWS lightning guidance for outdoor sports explains suitable shelter and the wait after the last thunder. A planning app cannot guarantee that lightning will stay outside the route.

Turn the comparison into a repeatable habit

1. Choose the location closest to the route and your available start times.
2. Compare the score and the conditions behind it.
3. Look ahead through the end of the session.
4. Pick clothing for that window using the temperature guide.
5. Recheck before leaving and use your alternative if conditions change.

Try London, Denver or Los Angeles. On iPhone, WeatherToRun brings the hourly comparison and clothing suggestions together; optional Plus features add planning and widget options. For the iPhone steps, follow the WeatherToRun getting-started guide. The aim is a decision you can use for your next run, then adjust when the forecast changes.