dailyweather.si

How our forecasts work

Every number on dailyweather.si comes from an official forecast. Here is where it comes from, how fresh it is, and what we do with it.

Where forecasts come from

For places in the United States, forecasts and warnings come from the US National Weather Service. Everywhere else, forecasts come from MET Norway, the Norwegian Meteorological Institute, which publishes forecasts for any place in the world. The sources page credits each one.

How fresh they are

For 8,880 larger places in the United States, the United Kingdom, Canada, Australia, and India, we check for new forecasts around the clock: the National Weather Service every 12 minutes, and MET Norway as soon as its forecast for a place is due to change. New forecasts appear on those pages within minutes, and we monitor that they do.

For every other place, and for coordinates, we fetch the forecast when someone opens the page, then renew it when it expires for as long as people keep opening it. The first visit can take a few seconds. If a weather service is busy or down, the page shows the last forecast we have and how old it is, or says the forecast isn't available yet. It never shows another place's forecast instead.

We check for US weather warnings every minute. Each page shows when its forecast was fetched, and says so if it is out of date.

Weather warnings

We show official warnings from the US National Weather Service for places and coordinates in the United States. We don't yet show warnings for other countries: each country's national weather service issues them, and the WMO Severe Weather Information Centre gathers them from services worldwide. A forecast on this site is not a warning.

Weather at coordinates

You can get the forecast for any latitude and longitude, including your own position if you allow it. We round coordinates to two decimal places, about 1 km, and the forecast is for that point, not for the nearest town. The page names the nearest place we know and shows the local time zone.

What we work out ourselves

  • Units for your country, which you can change.
  • Daily highs, lows, and rain totals from the hourly forecast.
  • The short outlook under the current weather, such as "Dry for the next 12 hours. Warming to 31° by 4 pm." Simple rules write it from the forecast numbers; AI does not.
  • The word "Dry": an hour or a day with a chance of rain of 5% or less, or less than a tenth of a millimetre forecast.
  • Sunrise and sunset, from the place's latitude and longitude, to shade night on the chart. They are standard astronomy, accurate to a minute or two, and not a forecast.
  • The UV index, for places outside the United States. MET Norway gives it for a clear sky, so we show it only when the sky is forecast to be mostly clear, with the World Health Organization's word for it: moderate from 3, high from 6, very high from 8, extreme from 11.
  • The name of each day in the daily list: the weather for most of the daytime, 7 am to 7 pm, with any rain noted beside it. A day with one wet hour is "Cloudy · 0.3 mm rain", not "Rain".
  • "Coming up": at most three things beyond the next 12 hours, by fixed rules in this order. The first spell of likely rain, hour by hour, or the first later day with a 50% chance or a millimetre or more. Thunder, freezing rain, sleet, heavy snow, or heavy rain, wherever they first appear; a whole day's risk is called "possible". A night at or below 0 °C, or else the first day whose high changes by 5 °C or more from the day before. Wind of 30 km/h or more (50 is "very windy"). A clear-sky UV index of 6 or more under a mostly clear sky. Nothing is listed when nothing is notable.

We never rewrite warnings. You see the official text, word for word, with a link to the original.

How we use AI

The ask box uses TypeSafe's Jev model to understand your question: what you want to know, which place, and what time. Jev never produces forecasts or numbers. We work out the answer from the forecast data, and when Jev is not sure what you mean, the ask box asks you rather than guess.

Weather at a glance

The large number is the temperature now. Sun, cloud, rain, snow, and moon illustrations sit beside the condition in words. Moon illustrations use the place's sunset and sunrise, so they show night rather than a different forecast. Wind direction is abbreviated: N means north, NE north-east, and so on; the full direction is available on the abbreviation.

  • Clear skies
  • Partly cloudy
  • Rain
  • Snow
  • Thunderstorms
  • Clear at night

The next twelve hours are sampled every two hours. Each column shows the forecast for that specific hour, including its temperature and rain. Blue shading draws attention to hours with precipitation forecast. Rain is a percentage chance in the United States and an amount in millimetres or inches elsewhere; amounts are for that hour, not the two-hour interval. The gold line shows the temperature trend. The summary uses every hour, including those between the samples. Choose an hour to see its details above, then choose Back to now to return.

The daily table labels each day's low, high, and rain explicitly. The first five days are shown; View all days opens the rest of the forecast. The source determines how many days are available. No days are discarded.

The complete forecast

Below the overview, the full 48-hour chart keeps both days on one temperature scale. The cloud band gets darker as cloud cover increases, the red line shows temperature, and green bars show rain. Shaded columns are night. Tap a column to see that hour above, or use the hour-by-hour table, which is also available without JavaScript. The table prints the condition again when it changes; screen readers receive every condition.

Accuracy

Our forecasts are as good as the weather services behind them. We don't yet publish our own measurements of how accurate they are.

Last updated 11 October 2026.