Get current weather, daily forecasts (up to 16 days), and hourly forecasts via @cynosure-mcp/weather — credential-free Open-Meteo API, 3 tools

@cynosure-mcp/weather v1.0.3 — 3 tools for weather via Open-Meteo

Install & run: npm install @cynosure-mcp/weather → entry dist/index.js (ESM, type: module)

Tools

Key gotchas

1. Built-in geocoding — pass location as city name (e.g. "Istanbul", "New York") and it resolves to coordinates via Open-Meteo's geocoding API; alternatively pass raw latitude/longitude for precise queries
2. `country_code` disambiguates — "Vienna" without it defaults to Vienna, Austria (largest population); "Springfield" defaults to Springfield, Missouri; pass 2-letter ISO code (e.g. "US", "AT") to override
3. Units: `metric` (default) or `imperial` — metric gives °C and km/h, imperial gives °F and mp/h (note: server labels it "mp/h" not "mph")
4. Daily forecast up to 16 days — days param, defaults to 7, max 16; includes sunrise/sunset times and UV index
5. Hourly forecast is LOCAL timezone — returns all 24 hours of the current day in the location's timezone; includes day/night emoji (☾/☀)
6. No API key needed — uses Open-Meteo's free public API (no rate limits for moderate usage)
7. First call ~1700ms (geocoding + weather API), subsequent calls ~70-160ms (geocoding cached)
8. Coordinates skip geocoding — passing latitude/longitude directly saves ~80ms per call
9. Wind includes direction as compass bearing (e.g. "NE (36°)") plus gust speed
10. Precipitation includes probability + duration hours — e.g. "0.5mm, 68% chance, 3h"
11. Ambiguous city resolution uses population — picks the most populated match (e.g. Springfield MO over Springfield IL)

Verified trace (11 calls, 100% success)

✓ get_current_weather({location:"Istanbul"}) → 27.8°C, Clear sky, NE 17km/h, humidity 53% — 1769ms
✓ get_current_weather({lat:48.86, lon:2.35}) → Paris: 19.8°C, Overcast, N 8.3km/h — 72ms
✓ get_current_weather({location:"Vienna", country_code:"AT"}) → 27.8°C, Clear sky, NW 9.5km/h — 153ms
✓ get_current_weather({location:"New York", units:"imperial"}) → 71.3°F, Clear sky, SW 6.5mp/h — 153ms
✓ get_weather_forecast({location:"Tokyo", days:3}) → 3-day: Jun 30 drizzle 21-29°C, Jul 1 overcast 22-27°C, Jul 2 drizzle 21-24°C — 151ms
✓ get_weather_forecast({location:"London", country_code:"GB", days:16}) → 16-day forecast with UV, sunrise/sunset — 146ms
✓ get_hourly_forecast({location:"Berlin", country_code:"DE"}) → 24 hours: midnight 20.7°C overcast → morning partly cloudy — 150ms
✓ get_current_weather({lat:-33.87, lon:151.21}) → Sydney: 16.1°C, Overcast, N 16km/h — 74ms
✓ get_weather_forecast({location:"Chicago", units:"imperial", days:5}) → 5-day: 77-97°F thunderstorms — 156ms
✓ get_current_weather({location:"Springfield"}) → Springfield MO: 24.4°C, Clear sky — 158ms (population-based disambiguation)
✓ get_hourly_forecast({lat:41.01, lon:28.98}) → Istanbul 24h: 24°C midnight clear → rising temps — 71ms

Latencies: min=71ms, p50=151ms, max=1769ms (first call includes geocoding warmup).