5 Best APIs for Forecasts in Nigeria

NiMet Weather API is the official weather data API provided by the Nigerian Meteorological Agency (NiMet), the government body mandated under Nigerian law to provide authoritative meteorological observations, forecasts, and climate data for Nigeria. As the national meteorological authority, NiMet operates Nigeria's network of synoptic weather stations, agrometeorological stations, and upper-air sounding stations spread across the country's 36 states and FCT, making NiMet the most authoritative source of weather data specifically calibrated to Nigerian conditions, terrain, and climate patterns. NiMet's weather station network covers Nigeria's diverse climate zones — from the humid tropical rainforest of the Niger Delta and Cross River basin in the south, through the savanna belt of the Middle Belt, to the semi-arid Sahel zone in the far north near Lake Chad. This geographic diversity means NiMet observations capture the distinct rainfall patterns, temperature ranges, and seasonal transitions specific to each Nigerian region. Global weather APIs that interpolate Nigerian data from sparse international stations cannot match the localized accuracy of NiMet's ground-truth observations. Daily weather forecasts from NiMet are produced by trained Nigerian meteorologists using sophisticated numerical weather prediction models calibrated to West African atmospheric patterns, including the behavior of the Inter-Tropical Convergence Zone (ITCZ) which governs Nigeria's rainy and dry seasons. The ITCZ migrates northward from March to August and southward from September to January, determining when each part of Nigeria experiences its rainy season. NiMet forecasters specialize in predicting ITCZ behavior and its impact on Nigerian rainfall, making NiMet forecasts particularly reliable for agricultural planning in Nigeria. Seasonal climate forecasts (Long-Range Forecasts) are one of NiMet's most valuable products for Nigerian agriculture and disaster preparedness. Published at the start of each year, NiMet's Seasonal Rainfall Prediction (SRP) forecasts normal, above-normal, or below-normal rainfall probability for each of Nigeria's ecological zones for the upcoming growing season. Nigerian state ministries of agriculture, commercial farmers, and agricultural input suppliers use these seasonal forecasts to plan planting programs, fertilizer procurement, and extension advisory calendars. Agrometeorological data from NiMet includes soil temperature and moisture observations from agrometeorological stations, evapotranspiration estimates, crop water requirement calculations, and growing degree day accumulations — specialized weather variables used by Nigerian agricultural scientists, irrigation engineers, and precision farming platforms to optimize crop production decisions. Harmattan advisory services from NiMet warn Nigerian communities about the onset and intensity of Harmattan — the dry, dusty northeast trade wind that blows off the Sahara Desert from November to March, reducing visibility, desiccating crops, and causing respiratory health issues across the country. NiMet Harmattan advisories provide advance warning so airlines, health facilities, and communities can prepare. Access to NiMet Harmattan forecast data through the API enables Nigerian alert platforms to distribute these warnings to app users. The NiMet API requires registration and API key access, with a freemium model providing basic weather data for free and paid tiers for commercial applications requiring higher volumes, historical archives, and specialized forecast products. Nigerian startups building local weather applications, government agencies building public information platforms, and NGOs supporting climate adaptation programs can all access NiMet data to serve Nigerian users with the most authoritative local weather information available.

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.

AccuWeather API is a premium weather data service renowned for its industry-leading forecast accuracy, hyperlocal precision down to the neighborhood level, and proprietary Superior Accuracy technology that has made it the weather data provider of choice for airlines, media companies, emergency management agencies, and enterprise applications where weather accuracy is mission-critical. AccuWeather's MinuteCast product provides minute-by-minute precipitation forecasts for the next two hours at the street level — a granularity no other weather API matches — and its 90-day daily extended forecasting is the longest commercial extended forecast available. Current conditions from AccuWeather include a rich set of data points: temperature, feels-like temperature, relative humidity, wind speed and direction, wind gusts, visibility, cloud cover, pressure, UV index, ceiling height, dew point, wet-bulb temperature, and AccuWeather's proprietary precipitation summary with precipitation type classification. For Nigerian applications where users need high-confidence current conditions — such as aviation weather apps used by Nigerian charter flight operators or construction project management systems — AccuWeather's measurement precision and data richness exceed what free-tier weather APIs provide. MinuteCast is AccuWeather's standout feature: minute-by-minute precipitation probability and intensity for the next 120 minutes at any location, with narrative summaries like "rain starting in 12 minutes, ending in 48 minutes." For Nigerian ride-hailing platforms, food delivery apps, and outdoor event managers in Lagos and Abuja, MinuteCast enables real-time rain start/stop prediction that allows users to make immediate decisions — shelter now, delay departure, or reschedule an outdoor activity. Daily and hourly forecasting from AccuWeather extends 15 days for daily forecasts and 240 hours for hourly forecasts, each packed with variables including RealFeel temperature (AccuWeather's proprietary feels-like temperature that accounts for humidity, wind chill, cloud cover, and solar radiation), precipitation probability, ice accumulation, thunder probability, evapotranspiration, and night/day summaries with narrative text. Nigerian agricultural advisors can use the 15-day forecast and evapotranspiration data to plan irrigation schedules for large commercial farms. Severe weather alerts through AccuWeather cover thunderstorms, heavy rain, flooding, high winds, and other hazardous conditions with lead times and affected area definitions. Nigerian emergency management platforms and public safety apps can integrate AccuWeather alerts to send push notifications to users in affected areas, helping communities prepare for severe weather events that are increasingly frequent due to climate variability in Nigeria. Location search and geocoding through the Locations API enable looking up AccuWeather location keys for cities, postal codes, IP addresses, and GPS coordinates. For Nigerian apps where users enter city names like "Ibadan", "Benin City", "Owerri", or "Maiduguri", the Location search API resolves these to AccuWeather location keys needed for subsequent weather data calls. AccuWeather's free developer trial provides 50 calls per day across its suite of APIs, which is enough for testing and prototyping Nigerian applications. Paid plans start at $25/month for 150 calls/day and scale up significantly for enterprise volumes. For Nigerian media companies, airlines, or large consumer weather apps requiring high accuracy and reliability, AccuWeather's paid tiers provide the SLA guarantees and data quality that commercial-grade applications demand.

Open-Meteo is a fully free and open-source weather API that provides high-resolution global weather forecasts, historical weather data, and climate projections without requiring any API key for non-commercial use. Built on top of state-of-the-art numerical weather prediction (NWP) models from ECMWF, GFS, Meteo France, DWD, and other meteorological agencies, Open-Meteo delivers hourly and daily weather variables across the globe with up to 16-day forecast horizons and access to decades of historical weather records. For Nigerian developers building weather-dependent applications who want a zero-cost starting point, Open-Meteo is one of the most capable free weather APIs available. Forecast data from Open-Meteo covers a wide range of weather variables: temperature at 2 meters, apparent temperature (feels like), precipitation, rain, showers, snowfall (unlikely in Nigeria but globally relevant), cloud cover, wind speed and direction at multiple heights, wind gusts, surface pressure, relative humidity, dew point, visibility, shortwave solar radiation, and cape (Convective Available Potential Energy for thunderstorm prediction). For Nigerian agricultural apps, the combination of precipitation forecasts and solar radiation data is particularly valuable for irrigation scheduling and solar energy production forecasting. The API returns data in hourly or daily resolution, selectable per request. Hourly data enables fine-grained analysis of weather through the day — important for Nigerian logistics operations planning around Lagos or Abuja rush-hour weather, or for event managers checking window-by-window rain probabilities for an outdoor concert. Daily data provides simplified summaries including max/min temperature, precipitation sum, sunrise/sunset times, and UV index maximum — ideal for Nigerian travel apps showing week-ahead weather summaries. Historical weather data through Open-Meteo is available from 1940 to the present via the Historical Weather API endpoint, sourced from the ERA5 reanalysis dataset by ECMWF. Nigerian climate researchers, agricultural historians, and developers building data analytics tools for climate trend analysis can access decade-long weather records for any location in Nigeria including remote northern and southern regions without subscription costs. This historical depth rivals expensive commercial weather data providers. Marine forecasting is supported through a separate marine endpoint returning wave height, wave direction, wave period, swell height, and ocean surface temperature — relevant for Nigerian fishing communities, port operators in Lagos and Apapa, and oil and gas companies operating in the Gulf of Guinea. The marine data combined with standard atmospheric forecasts gives a complete picture of weather-related conditions for offshore and coastal Nigerian operations. Air quality forecasting from Open-Meteo includes PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide, carbon monoxide concentrations, UV index, and European and US Air Quality Index calculations. Nigerian urban health apps monitoring air quality in Lagos (which has significant vehicle and industrial air pollution) can use the air quality forecast to send pollution warnings and health advisories to users. Climate projections through the Open-Meteo Climate API provide future temperature and precipitation projections from CMIP6 climate models, allowing comparison of projected future climate against the historical baseline. Nigerian policy researchers and environmental NGOs can use these projections to model climate change impacts on Nigerian agriculture, water resources, and urban heat islands. Open-Meteo is free for non-commercial use with no API key required — just call the endpoint with latitude, longitude, and the desired weather variables. Commercial use requires a subscription which remains affordable at under $50/month for most volumes. The API is highly reliable, well-documented, and used by thousands of developers worldwide, making it a strong foundation for any Nigerian weather-aware application.