WhatAWeatherSurf & wave forecast
Hour-by-hour surf conditions with a score per session: wave height, period, swell direction, wind and the best windows of the day.
Check the surfFree calculators for professionals, students, and the curious: streamflow in channels, flood risk, unit converter, and monthly water balance.
Hour-by-hour surf conditions with a score per session: wave height, period, swell direction, wind and the best windows of the day.
Check the surfFind the best night to shoot the sky: cloud cover, moon phase and moonrise, astronomical darkness and hour-by-hour sky score.
Plan your nightRainfall deficit and drought status for your area: accumulated precipitation versus normal, SPI index and historical context since 1940.
Check droughtWeather records and history for any date in your city since 1940: hottest, coldest and wettest years, normals and the warming trend.
Look up a dateEvery hour scored 0–10 for running or cycling: feels-like temperature, UV, wind, rain and air quality, with today's best window.
Find your windowLeg-by-leg forecast for your road trip at your time of passage: rain, gusts, fog and snow with warnings per leg and a map.
Plan routeECMWF, GFS and ICON compared over 10 days: temperature, rain, wind, layered clouds, pressure and forecast reliability.
View meteogramMonth-by-month climatology for any destination in the world with 10 years of data: best dates, climate chart and destination comparison.
Pick dates7-day frost risk, water balance with ET0, accumulated growing degree days and treatment windows with no wind or rain.
Open agro dashboardPowder finder for 24 resorts in Spain, Andorra and the Pyrenees, forecast at 3 elevations, freezing level, map and webcams.
View snow reportPick your town in Spain, your minimum level (yellow/orange/red) and get your basin's flood warnings by email. Free, one-click unsubscribe.
Activate alertsReal-time interactive map with reservoirs, SAIH flow rates, AEMET warnings, and T10/T100/T500 flood-prone zones on a Ventusky-style dark basemap.
Open advanced mapCalculate flow rate in channels and rivers using the Manning formula with rectangular, trapezoidal, or circular cross sections.
Open toolEstimate, as a guideline, the flood risk of a location based on rainfall, distance to the riverbed, elevation, and SNCZI zoning.
Open toolConvert wind speed, precipitation, temperature, pressure, flow rate, and reservoir volume in real time.
Open toolCalculate monthly PET and water balance (P-PET) with presets for Spanish cities and an SVG P/PET chart.
Open toolWatch real-time conditions from hundreds of beach, mountain, reservoir and city webcams across Spain and Europe.
Watch webcamsWave height, period, direction and sea temperature for 100+ beaches. Made for surfers, sailors and sport fishing.
View seaCompare forecasts from the major numerical models (GFS, ICON, ECMWF) side by side. Find the most reliable one.
CompareAnimated wind, temperature, pressure, waves, clouds, lightning and more. 12 layers with 10-day forecast (Ventusky/Windy style).
Open mapThese calculators complement the real-time data on the WhatAWeather map. They let you size flow rates in drainage projects, quickly assess flood exposure, convert between common units in hydrology and meteorology, and characterize a region's climate through the monthly water balance.