The Google Weather forecast is created from an internal forecasting system that utilizes weather models and observations from global weather agencies.
Learn more about the Google Weather forecasting data sources:
- Deutscher Wetterdienst
- Environment Canada
- EUMETNET
- European Centre for Medium-range Weather Forecasts (ECMWF)
- National Oceanic and Atmospheric Administration (NOAA)
- National Weather Service
- Met Office
- Unidata
Tip: In South Korea and Japan, Google weather forecast information isn't available.
The Google nowcast
You can find short-term precipitation forecasts up to 12 hours in advance with the Google nowcast. The weather information box shows the Google nowcast when you search for weather data on a mobile device.
Important:
- The start and end times that show are in the local time zone of the location you search for.
- This high accuracy short-term precipitation information is available in the United States, Japan, and Europe.
Our nowcast uses radar and numerical weather prediction data. published by various data sources.
Learn more about the Google nowcast data sources:
- Deutscher Wetterdienst
- EUMETNET
- European Centre for Medium-range Weather Forecasts (ECMWF)
- National Oceanic and Atmospheric Administration (NOAA)
- Met Office
- Japan Meteorological Agency
- NASA, Global Precipitation Measurement Mission
In Japan, Weathernews provides the nowcast forecast. It uses the technology we developed in collaboration with Weathernews. The technology leverages Google's AI analysis capabilities on Weathernews' high-precision data. The explanations about Japan here apply to other relevant sections below as well.
Tip: In addition to the short-term precipitation forecast, weather maps are also available on limited surfaces.
Should I expect precipitation during the day
You can check the next precipitation event with the Google nowcast. All precipitation shows in the hourly precipitation forecast.
Why can't I find the Google nowcast
If there’s no forecast for rain, hail or snow, or if the forecast is too uncertain, the Google nowcast data won’t display.
In such cases, all weather information is shown in the hourly precipitation forecast. In addition, the Google nowcast may not be available on all weather surfaces.
Reports on current weather conditions
When you search for weather info on Google, you might be asked to provide feedback on the current weather in your area. Your feedback helps us monitor the quality of weather results and update the data.
You can find and delete your feedback in My Activity. When you delete your feedback from your Google Account, it’s no longer associated with your account, but it can still help improve weather results.
Google excessive heat warning
Learn about excessive heat warning FAQs.
Air quality information
How is an Air Quality Index (AQI) near you selected
To show the air quality at your location, Google applies the air quality model. Learn how to understand and manage your location.
If you search a city’s air quality, such as “weather in London,” the result might be for a location far away from you. The air quality might be incorrect even if you're in the same city.
To get AQI for your location:
- On the header, click Choose area.
- Select your precise location.
What is the data source of Google’s Air Quality model & is it accurate at all times
Google’s air quality model combines data from various input sources and weights the layers in a sophisticated way. The input layers are:
- Governmental reference monitoring stations
- Commercial sensor networks
- Global and regional dispersion models
- Fire smoke and dust models
- Satellite information
- Traffic data
- Auxiliary information such as land cover and meteorology
Air quality data sources
Google Air Quality model contains information available from the sources below.
Global data sources
- Low-cost sensor data from Purple Air.
- Modified Copernicus Atmosphere Monitoring Service information.
- Modified Copernicus Global Land Cover information.
- Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
- European EEA information under CC-BY-2.5 DK license.
Belgium
- Modified IRCEL - CELINE information. License.
Canada
- Information from the Manitoba government, licensed under the OpenMB Information and Data Use Licence Manitoba.ca/OpenMB.
- Information licensed under the Open Government Licence – Ontario, version 1.0.
Denmark
- DCE - National Center for Miljø og Energi. The data is raw and isn't quality controlled.
Finland
France
- Pays de la Loire: Source of the data: Air Pays de la Loire.
- Geo D'Air.
Germany
- Contains modified German Environment Agency information. Changes were made.
Guernsey
- © Crown 2023 copyright Defra via uk-air.defra.gov.uk.
Italy
- Regione del Veneto. License.
Ireland
- Environmental Protection Agency (EPA): https://epa.ie/ https://airquality.ie/. License.
Japan
- Modified Soramame information.
Mexico
- The Air Quality information published by the Environment Secretariat of the Government of Mexico City is prepared from the information obtained from:
- The Atmospheric Monitoring Network.
- Monitoring stations in the Metropolitan Zone of the Valley of Mexico.
- These are operated and managed by the Air Quality Monitoring Directorate of the General Directorate of Air Quality (SEDEMA). This information is public and free, and it’s subject to quality processes that could modify it. The dissemination or use of this information by third parties is under the responsibility of the person who publishes or uses it.
- SINAICA, https://sinaica.inecc.gob.mx/. Changes were made.
Spain
- MeteoGalicia and the Ministry of the Environment, Territory and Housing of Xunta de Galicia.
- Madrid Comunidad.
- Ministry of the Environment information under CC BY 4.0 license.
Sweden
- Contains modified SMHIinformation.
UK
- © Crown 2023 copyright Defra via uk-air.defra.gov.uk.
- Contains LondonAir information. License.
- Northern Ireland Air.
US
- Texas TCEQ.
- New York State, Department of Environmental Conservation: The data displayed here are from nyaqinow.net. This data is preliminary and subject to change.
Pollen information
Important: Pollen information isn't available on all Google surfaces and weather experiences.
What is the pollen index
Google's pollen model provides an effective and simple pollen index to help you determine the likelihood of experiencing allergy symptoms from upcoming pollen exposure. This index considers both concentration of allergenic pollen in the air and the likelihood of developing symptoms due to the specific types of pollen present. It focuses and tracks various plant species on:
- Grass
- Trees
- Weeds pollen types
The pollen index consists of 5 categories:
- 0: None
- 1: Low
- 2: Medium
- 3: High
- 4: Severe
Tip: Specific coverage and forecast days may be different based on your location.
How a Universal Pollen Index (UPI) near you is selected
Google applies its pollen model to show the pollen index at your location. This includes regional plant species and pollen types with a resolution of 1 x 1 kilometer or 0.6 x 0.6 mile, such as:
- Grass
- Trees
- Weeds
What's the data source of Google’s pollen model & is it accurate at all times
To create a comprehensive and accurate prediction, Google's pollen model draws on a diverse range of data sources. This includes:
- Regional numerical models
- Land cover data
- Insights on plants' pollen production and seasonality
- Weather forecasts
This approach allows the model to weigh various factors and provide a view of pollen index levels. While Google strives for the highest accuracy, factors like local environmental fluctuations can still influence pollen data.
Accuracy of the model is verified against pollen monitoring stations measurements where available.
Model limitations
While our pollen model offers valuable insights, to ensure accurate interpretation of the data, it's important to understand its limitations:
- The pollen model is updated daily and may not reflect real-time changes.
- Our pollen forecast may not reflect localized factors, like the presence of allergenic plants in your backyard or neighborhood.
- Limited availability of local pollen count may affect the accuracy of the model in your area.
- Our pollen data covers a limited number of plant species and may not reflect all allergens present in your area.
Pollen data sources
Google’s pollen model contains information available from the sources below.
Global data sources
- Contains European Commission information under CC-BY-4.0 license.
- Contains Global Biodiversity Information Facility under CC-BY-4.0 license.
- Modified Copernicus Atmosphere Monitoring Service information. Neither the European Commission nor the European Centre for Medium-Range Weather Forecasts (ECMWF) is responsible for any use that may be made of the Copernicus information or data it contains.
Germany
- ePIN, https://lgl.bayern.de/impressum/index.htm#nutzungsbedingungen, changes were made.
UK
- Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Supported species per country
| Country Name | Supported Types | Supported Plants |
| France | trees, grass, weeds | hazel, alder, ash, birch, cottonwood, oak, olive, pine, grasses, ragweed, mugwort |
| Germany | trees, grass, weeds | hazel, alder, ash, birch, cottonwood, oak, olive, pine, grasses, ragweed, mugwort |
| Italy | trees, grass, weeds | hazel, alder, ash, birch, cottonwood, oak, olive, pine, grasses, ragweed, mugwort |
| United Kingdom | trees, grass, weeds | hazel, alder, ash, birch, cottonwood, oak, olive, pine, grasses, ragweed, mugwort |