How accurate 7 day weather forecast is?

Feb 20 2021 - Views: 2040
Rate: 4.7 - 50Votes
You can access different sites to get detailed weather information, from hourly weather forecasts to an accurate 7-day weather forecast. But have you ever wondered how reliable these predictions are? In this article, we will explain how accurate this weather forecast is and recommend some sites for checking the weather accurately. 

accurate 7 day weather forecast

Where to get an accurate 7 day weather forecast?

How reliable weather forecasts are?

Different kinds of weather forecasts have different accuracy levels. (hourly weather forecast, weather 7 days, weather 10-day forecast)

  • Nowcasting (0-6 hours)

Nowcasting uses weather data from different sources to form the current weather and forecast the weather a short period ahead ( six hours) by using an estimate of its speed and movement direction. This forecast is updated every hour.

  • Short-range weather forecasts (1-3 days)

Short weather forecasts range from the nowcasting time-scale to the next 24-hour weather forecast, and the next two days. The accuracy of this kind of forecast is about 80%, great for planning purposes. 

Short-range forecasts provided by GoWeather are extremely accurate and are constant.

  • Medium-range weather forecasts (3-10 days)

Weather 5-day forecast of a medium-range forecast is likely to change and forecasts further into the future can have dramatic shifts.

Medium-range weather forecasts cover the time from around 3 to 10 days ahead.

They are less accurate than short-range weather forecasts due to the weather’s possibly dramatic changes.

The three to next 5 days weather forecast provides a general picture of the weather on a day-by-day basis, with the main regional variations identified. 

The next 6 days forecast, accurate 7 day weather forecast, or 10 days weather forecast provide a broad description of the weather likely to be affecting a given region, including significant changes in the type of weather. Also, it offers an assessment of the impacts of severe weather, such as extended periods of high or low temperatures.

accurate 7 day weather forecast

How accurate 7 day weather forecast is?

Long-range weather forecast

The chaotic nature of the atmosphere makes it more difficult for over 10-day weather forecasts in the future (next 15 days weather forecast, next 20 days weather forecast, next 30 days weather forecast). While we can still forecast the general feel of the weather to a relatively high level of accuracy, it becomes harder to offer detailed information on local weather conditions. 

The long-range forecast only provides an indication of how the weather might change, or be different from normal, (i.e. warmer, colder, wetter, drier). 

How accurate 7 day weather forecast is?

A seven-day forecast can be 80% accurate and a five-day forecast can accurately predict the weather approximately 90 percent of the time. However, only half the time

a 10-day or longer forecast is. You can access a wide range of websites to get an accurate 7 day weather forecast.

Forecasts are made based on the use of computer programs called weather models and meteorologists. 

Since it’s impossible to collect data from the future, models have to use assumptions to predict future weather. Because of the constant changes in the atmosphere, so those estimates are less reliable for long-range predictions. 

Is the weather 14 day Forecast  Accurate?

It goes without saying that the combination of computer-based models and human experience makes weather predictions more accurate than before.

However, as a rule of thumb, the shorter the time range is forecasted, the more accurate the weather forecast is. 

accurate 7 day weather forecast

Sites for accurate 7 day weather forecast 

Due to many unknown variables, the chance of error for long-term forecasts that predict the weather for more than 7 days is high. In other words, it’s challenging for current weather forecast models to paint a clear picture of how accurate 14 day weather forecast is. 

What is the most reliable weather forecast?


As one of the most accurate sources for weather forecasts and warnings in the world, GoWeather keeps people safe and out of harm's way by providing an accurate 7 day weather forecast and even 10-day weather forecasts.

Our interactive weather maps can be customized to show forecasts of temperature, weather, and wind. You can also overlay pressure and live weather observations on maps of any country. Select our weather forecast pages today to get 3 hourly detail and live weather reports. Browse our weather photo albums showing a great selection of weather extremes from around the world including hurricanes, floods, storms, tornadoes, and major snow events.

weather forecast

Get accurate 7 day weather forecast on GoWeather

The Weather Channel

This is one of the best weather sites for an accurate 7 day weather forecast. It is easy to read. Besides, the site also provides weather-related news, easy-to-use interactive maps. Accessing the site, you can get detailed data like dew point, humidity, temperature, and wind. You can also turn on watches and warnings. 

However, ads can detract from the viewing experience.

Weather Underground

Another site providing weather updates is Weather Underground. The website has a current weather report for where you are standing and a weather forecast for other places.

In addition to top weather news spread on the rest of the home page, the site also has more sections such as Maps and Radar, Sensor Network,, Severe Weather,  Blogs, and More. For real-time weather alerts, you can sign up for the website.

How reliable weather forecast sites are?

My friends were planning to have a trip around  Montreal Next Sunday. We decided to check the weather forecast to have good preparation on different sites.

One website tells me it will be 30℃ with some thunderstorms, another tells me 25℃ with only rain, and another 23℃ with some clouds. Why this difference?

The process of weather forecasts begins with data and observations of the current state of the atmosphere collected from weather stations all over the world, satellites, reports. Next, the data is fed into supercomputers to generate numerical models, which gives the basis of the weather forecast.  

accurate 7 day weather forecast

Can an accurate 7-day weather forecast exist?

After that, the meteorologists use their knowledge of the local weather patterns to interpret the models. 

Some models designed especially for the long-term, others are for short-term forecasting. However, It's the meteorologist who knows how good the reputation of each model is, adjust and improve the forecast based on this knowledge.

In short, the variation among weather sites comes from the different supercomputers and meteorologists who adjust those forecasts further.


No doubt, the development of technology has greatly contributed to the accuracy of forecasting. You can get an accurate 7 day weather forecast from the reliable sites listed above. However, just like the economy, the weather always keeps its secrets, resisting our efforts to accurately predict the future. The further weather forecasts, the less accurate they are

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