Weather forecast

What this does

Returns a day-by-day weather forecast for a UK location. Each day includes high and low temperatures, conditions, and chance of rain. You choose how many days ahead to fetch (within the allowed maximum).

Who it is for

• Trip and event planning over the next week
• Logistics teams scheduling outdoor deliveries
• Apps showing a simple forecast strip for a saved postcode
• Newsletter writers adding a weekly outlook

Try it

Default: Bristol, 5 days.

https://fetch.li/v1/weather/forecast?postcode=BS11AA&days=5

Other examples:

https://fetch.li/v1/weather/forecast?lat=54.9783&lon=-1.6178&days=3
https://fetch.li/v1/weather/forecast?postcode=G11AA&days=7

HTTP example

GET /v1/weather/forecast?postcode=BS11AA&days=5 HTTP/1.1
Host: fetch.li
Accept: application/json

curl

curl -sS "https://fetch.li/v1/weather/forecast?postcode=BS11AA&days=5"

JavaScript fetch

const params = new URLSearchParams({ postcode: "BS11AA", days: "5" });
const response = await fetch(
  `https://fetch.li/v1/weather/forecast?${params}`
);
const forecast = await response.json();
forecast.days.forEach((day) => console.log(day.date, day.summary));

Python requests

import requests

response = requests.get(
    "https://fetch.li/v1/weather/forecast",
    params={"postcode": "BS11AA", "days": 5},
)
response.raise_for_status()
forecast = response.json()
for day in forecast["days"]:
    print(day["date"], day["summary"])

Example JSON response

{
  "location": {
    "postcode": "BS1 1AA",
    "lat": 51.4545,
    "lon": -2.5879,
    "label": "Bristol"
  },
  "days_requested": 5,
  "timezone": "Europe/London",
  "generated_at": "2026-08-25T11:00:00.000Z",
  "days": [
    {
      "date": "2026-08-25",
      "summary": "Light rain showers",
      "high_c": 18,
      "low_c": 12,
      "precipitation_chance_percent": 65,
      "wind_speed_mph_max": 14
    },
    {
      "date": "2026-08-26",
      "summary": "Partly cloudy",
      "high_c": 20,
      "low_c": 13,
      "precipitation_chance_percent": 20,
      "wind_speed_mph_max": 10
    },
    {
      "date": "2026-08-27",
      "summary": "Sunny intervals",
      "high_c": 22,
      "low_c": 14,
      "precipitation_chance_percent": 10,
      "wind_speed_mph_max": 8
    },
    {
      "date": "2026-08-28",
      "summary": "Cloudy",
      "high_c": 19,
      "low_c": 13,
      "precipitation_chance_percent": 35,
      "wind_speed_mph_max": 11
    },
    {
      "date": "2026-08-29",
      "summary": "Heavy rain",
      "high_c": 17,
      "low_c": 11,
      "precipitation_chance_percent": 80,
      "wind_speed_mph_max": 18
    }
  ]
}

Parameters

Provide either postcode or both lat and lon.

Errors that can happen

Demo

GET endpoints work without an API key on the public demo tier (60 calls per hour per IP). POST /v1/vibe/classify needs a key.