OpenWeatherMap
OpenWeatherMap is one of the world's most widely used weather APIs, offering current weather conditions, hour-by-hour and day-by-day forecasts, historical weather data, air quality indices, UV indices, and weather alerts for over 200,000 cities and any geographic coordinate worldwide. With a generous free tier and a well-documented REST API returning JSON or XML, OpenWeatherMap has become the default starting point for millions of developers building weather features into their applications — from simple current-condition widgets to complex agricultural decision support systems. Nigerian developers have relied on OpenWeatherMap for years to power weather features across diverse use cases including farming apps, logistics platforms, and event management tools.
Current weather data from OpenWeatherMap is returned per city or coordinate pair and includes temperature, feels-like temperature, min/max temperatures, atmospheric pressure, humidity, visibility, wind speed and direction, cloudiness percentage, and weather condition code with text description and icon. The condition icons can be fetched from OpenWeatherMap's CDN using the icon code returned in the API response, giving Nigerian app developers an easy path to visually rich weather displays without sourcing their own icon sets.
Hourly forecasting through the One Call API endpoint provides hour-by-hour weather up to 48 hours, minute-by-minute precipitation for the next hour, daily summaries for 8 days, weather alerts, and historical data for any past date. Nigerian logistics companies like courier services and ride-hailing apps can use the minute-by-minute precipitation data to warn drivers about imminent rain in the next 60 minutes — a critical feature during the heavy rainy season in Lagos, Port Harcourt, and other southern Nigerian cities where sudden downpours can disrupt operations.
Geocoding through the OpenWeatherMap Geocoding API allows converting city names to geographic coordinates, making it easier to handle user input in Nigerian apps where users type city names like "Abuja", "Kano", "Enugu", or "Benin City" rather than entering latitude/longitude. The reverse geocoding function converts coordinates back to location names, useful for location-aware weather apps that determine the user's city from device GPS.
Historical weather data is accessible through the One Call API with Unix timestamps, returning weather conditions for any past date at any location. Nigerian agricultural data platforms, insurance companies, and research institutions can use historical weather records to validate past growing season conditions, assess crop insurance claims, or build weather-indexed financial products tied to historical rainfall patterns.
Agricultural weather data through OpenWeatherMap's Agricultural API provides soil temperature, soil moisture, and vegetation indices alongside standard weather variables — enabling Nigerian precision agriculture platforms to factor in soil conditions alongside atmospheric weather in their crop management recommendations. For Nigerian farmers in the North-West grain belt and Middle Belt mixed farming areas, soil moisture data helps guide irrigation decisions.
OpenWeatherMap pricing starts with a free tier of 1,000 API calls per day, which is sufficient for development, small apps, and low-volume integrations. Paid plans scale from $40/month for higher call limits, with the One Call API billed per call beyond the free allowance. The freemium model makes OpenWeatherMap accessible for Nigerian startups who can start building and validating their weather product for free before committing to paid plans as their user base grows.