How GoodDayTo judges car washing weather
The frustrating part of washing a car is not the weather while you are washing it; it is rain arriving soon afterwards. GoodDayTo looks across the forecast window so a dry hour followed by an immediate shower does not get treated as an ideal result.
- Current precipitation
- Rain probability in following hours
- Wind speed
- Temperature
- Drying conditions
🌞 Make the most of the good window
- Choose a period with several dry hours after the wash when possible.
- Avoid washing a very hot body panel in intense sun because water can dry too quickly and leave marks.
- Strong wind can blow dust and debris onto freshly cleaned paintwork.
When a good car-washing score is most useful
For washing a car outdoors, the best weather is usually dry, not too windy and unlikely to rain soon afterwards. GoodDayTo penalises rain risk strongly because a wash immediately followed by a shower is frustrating and can leave fresh spotting. It also reduces the score as wind rises because wind can carry dust, leaves and spray across the vehicle while you work.
A WAIT result can be worth following when the forecast shows a drier block later the same day. In hot sunshine, working panel by panel and avoiding water drying instantly on the paint can help reduce water marks even when the overall weather score is good.
What the car-washing score cannot know
GoodDayTo does not measure local pollen, construction dust, water hardness, restrictions on outdoor water use or whether your driveway is shaded. It also cannot predict every brief local shower. The score is designed to answer “is the weather broadly worth washing in?” rather than judge detailing technique, paint condition or local water rules.
What the score means
GO means the weather signals we can measure look favourable. WAIT means conditions are mixed and a better hour may be nearby. NOT TODAY means the forecast currently contains enough unfavourable signals that this activity is unlikely to be a good weather choice. These are planning recommendations, not safety clearances.
Frequently asked questions
How far ahead does the car-wash score look?
The tool evaluates the upcoming hourly forecast and favours windows that are dry rather than relying only on the weather at this exact minute.
Is sunshine always best for washing a car?
No. Mild, dry conditions can be easier to work in than intense direct heat.
Why does a dry hour sometimes get a WAIT score?
Rain risk, gusty wind or poor conditions in the hours around it can lower the recommendation.