Weather services: Updates and production

You can find the weather forecast for around 17,000 localities in Finland on the local weather webpage. You can also check the weather at foreign locations on our local weather page.

The Finnish Meteorological Institute's web service contains dozens of different weather products. This page give you more detailed information on the updating schedules and production methods of these services. Please note that the Institute cannot guarantee that information is always updated at the times given.

Local weather: Weather forecast for Finland

You can find the weather forecast for around 17,000 localities in Finland on the local weather webpage. In addition to all of Finland's municipalities, the list also includes villages, districts and islands. You can also check the weather at foreign locations.

The weather forecast is given for the place selected in the Local weather quick menu. Using text prediction, you only need to give the first letters of the place name and then pick the interesting weather forecast on the list of suggestions. The place names are from the GeoNames database, which is updated by the users. 

Weather symbols, temperatures and wind speed and direction depict the forecast situation at a given time.

The local weather forecast applies to inland weather. Marine weather forecasts can be found in the Marine weather and Baltic Sea section.

The weather forecast is not dependent on the nearest weather observation station. For example, if you select Rauma from the local weather menu, you will see a forecast for the centre of Rauma rather than a forecast for the off-shore Kylmäpihlaja observation station. This is despite the fact that the nearest observation station to Rauma is situated at sea.

Weather forecast for the next few hours and 5 days and 10 days table forecast

  • Weather symbol. The moon symbol is used during the night when the sun is below the horizon.
  • Temperature
  • Wind speed and direction. The point of the arrow shows the direction in which the wind is headed. For example, the arrow depicting a southerly wind points north. In local weather is used the wind speed average for 10 minutes. Wind warnings for land areas are given about wind gusts, which are 1-2 times stronger than average wind speed.
  • Feels like. The temperature given inside the figure takes into account the wind chill factor as well as the effect of humidity and sunshine. If the 'feels like' temperature is at least 5 degrees colder than the forecast temperature, the figure will be blue. If the 'feels like' temperature is at least 2 degrees warmer than the forecast temperature, the figure will be orange.
  • Probability of precipitation for the hour preceeding the forecast time, in percentages. A value for 18:00 refers to precipitation between 17:00 - 18:00. The probability of precipitation applies to precipitation of 0.1 or more millimetres.
  • Forecast quantity of precipitation, in millimetres, between forecast time and previos forecast time. For example Monday 15 rain amount 0,6 mm is from 03 to 1503. Snowfall is given as snow water equivalent.
  • Hourly forecast: The weather forecast for the next few hours covers the upcoming 18 hours and is given every hour.
  • Five days forecast: First the forecast is given every 3 hours, thereafter, the forecast is given every six hours, at 03, 09, 15 and 21 (local time) and the rest of the forecast is given every 12 hours at 03 ja 15.
  • Ten days table forecast: Forecast for calendar day forecast is given every hour and thereafter every 3 hours.

Forecasts are updated several times every day.

See the explanations for the weather symbols used for the web service.

Ten-days probability forecast: weather forecast model's forecast and meteorologist's forecast

A forecast spanning several days is often more uncertain than the forecast for the next day. In the ten-day forecast, temperature and precipitation quantities are also depicted using a probability forecast produced by the weather forecast model. In coastal and other marine areas in particular, the weather forecast generated by the weather model may deviate significantly from the weather forecast given by the meteorologist. The same is when temperatur has large day and night variation. Especially this is so in the begining of forecast.


Additional information about the image can be obtained by hovering your cursor over the relevant time period. The additional information section gives the weather model forecast for the given time as well as the 80% uncertainty range on the forecast.
 

The temperature scale is on the left-hand side of the graph and the precipitation scale is on the right. Temperatures are measured in whole degrees and precipitation to an accuracy of one tenth.

Temperatures are depicted with red bands.

  • The red line is used to mark the median of forecasts produced by the weather model.
  • The probability of the band marked in darker red is 50 per cent.
  • The area marked in lighter red is the area in which the probability of the temperature is 80 per cent.

Precipitation is depicted using blue bars.

  • The black horizontal line depicts the median of the precipitation forecast produced by the weather model.
  • The probability of the band marked in darker blue is 50 per cent.
  • If the probability of precipitation is 80%, it is marked in lighter blue.

The temperature given is the value at a given time. The precipitation quantity is the precipitation accumulated during the past six hours, given in millimetres.

The probability forecast is updated twice every twenty-four hours. The update time may vary due to production-related factors.

The probability forecast is given by the European Centre for Medium-Range Weather Forecasts (ECMWF).

Meteorologist's forecasts

Weather forecasts presented using weather symbols are given by a meteorologist. These forecasts do not always fall within the probability range.

The meteorologist's temperature forecast is marked on the graph using a black dotted line. The meteorologist's forecast may sometimes deviate significantly from the probability forecast calculated by the computer model.

The meteorologist updates the weather forecast to cover a period of just under 10 days. The end of the graph may show a brief period wherein only the weather model's probability forecast is shown.

Local weather: International weather

You can find weather forecasts and sunrise and sunset times for thousands of foreign locations on our local weather page.

Using text prediction, you only need to give the first letters of the place name and then pick the interesting weather forecast on the list of suggestions. The place names are from the GeoNames database, which is updated by the users. If you find any errors in the names, please notify GeoNames using the feedback form.

Local time is used in forecasts, for example 3, 9, 15 and 21.

Observations are not in international weather.

Precipitation probability forecasts are only available for the following areas adjacent to Finland:

  • Nordic countries (except Iceland)
  • Northern parts of Central Europe
  • Baltic states
  • Northern parts of Belarus
  • Westernmost part of Russia

Ten-day forecasts are available for a slightly wider area. In Western Europe the boundary lies north of the 51st parallel, while in Eastern Europe it is slightly further to the south. In Russia the area extends east of the area for which precipitation probability forecasts are available.

Local weather observations

Local weather observations are collected from the Finnish Meteorological Institute's observation stations. The name of the observation station is given together with the observations. Information is updated generaly every 10 minutes.

The page shows one or more observation stations closest to the forecast site. All localities do not necessarily have a suitable observation station within the same municipality. Some localities have several observation stations.

Observations are not in international weather.

The observation stations transmit the following data, depending on the station:

  • temperature
  • atmospheric pressure
  • relative humidity
  • dew point
  • wind direction and speed (10-minute average wind)
  • gust value of wind (greatest 3-second average wind)
  • precipitation during the past hour
  • snow depth
  • cloudiness
  • visibility

The observation quantities reported vary from station to station depending on what data are measured at each station. There is only one daily precipitation observation from precipitation stations.

Cloudiness codes are converted to text as follows:

  • 0/8 =     sky clear
  • 1–2/8 = almost clear
  • 3–5/8 = partly cloudy
  • 6–7/8 = almost cloudy
  • 8 =        cloudy
  • 9/8 means that the amount of clouds cannot be determined, for instance, because of thick fog or heavy rain.

Observation curves

Observation curves are updated as frequently as the observation data in text format. The observation quantities reported vary from station to station depending on what data are measured at each station. There is only one daily observation from some stations (daily weather).

  • Weather: temperature and dew point temperature and precipitation during the past hour.
  • Wind: wind speed (10 min. avarage), wind gust and wind direction. The arrow indicates the wind direction. For example, a northerly wind blows from the north and the arrow points downwards. Correspondingly, an easterly wind blows from the east and the arrow points to the left.
  • Snow depth daily at 8 (at 9 in daylight saving time).
  • Daily weather at 8 (at 9 in daylight saving time): Minimum, maximum and grass minimum temperature during past 24 hour and precipitation during past 24 hour.

Weather radar and lightning observations

Local weather shows the weather radar observations (precipitation data) from the last hour as an animation updated at 5-minute intervals. Similarly, it shows data on lightnings from the flash observation system. The image is updated every 5 minutes. You can change the time in the image step by step by rolling the scroll wheel of your mouse.

Times for sunrise and sunset

The sunrise and sunset times given are the values calculated for the locality in question. If there are any minor differences between these times and other sources determining sunrise and sunset times, they may stem from the fact that sunrise and sunset times are calculated using several astronomical formulas. Moreover, the coordinate points used in the calculation may give rise to differences in the times given.

6.7.2017