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FOMO Sun in your AI assistant

Ask Claude, ChatGPT or Muse “where is it sunny near Zurich tomorrow?” and it answers from FOMO Sun: sun at home and at 387 day-trip places after the travel time, the fog line, live trains. Free, read-only, no login.

The address

https://fomosun.com/api/mcp

Add it

Claude

  1. Settings → Connectors → Add custom connector.
  2. Name: FOMO Sun. URL: the address above. No sign-in needed.
  3. In a chat, turn FOMO Sun on in the tools menu and ask.

ChatGPT

  1. Settings → Apps & Connectors → Advanced settings: turn on developer mode.
  2. Create a connector: name FOMO Sun, the address above, authentication: none.
  3. Pick it in a new chat and ask.

Muse

  1. Add a connector and choose an existing MCP server.
  2. Paste the address above, no authentication.

Other MCP clients

  1. Any client that speaks MCP over HTTP (Streamable HTTP): add the address as a remote server.

Menus move between app versions; if a step looks different, look for “connectors” or “MCP” in the settings.

Ask it

  • “Where is it sunny near Zurich today, at most an hour by train?”
  • “Is Bern under the fog? How high do I need to go?”
  • “Plan a trip to Rigi tomorrow from Basel: which train, when to leave?”
  • “Which day this week is best for a sunny trip from Luzern?”
  • “A thermal bath in the sun within 90 minutes of St. Gallen?”

Auf Deutsch geht es auch, die Antworten kommen dann auf Deutsch:

  • “Wo ist es heute sonnig, höchstens eine Stunde ab Bern?”
  • “Wie hoch liegt die Nebelobergrenze heute?”
  • “Plane mir einen sonnigen Samstag ab Zürich.”

Ready-made prompts

In clients that list prompts (in Claude: the + menu):

  • Where is it sunny today?: the sunniest trips from home right now, with trains
  • Escape the fog: the fog top and the nearest place above it
  • Plan my sunny weekend: Saturday or Sunday, and where to go
  • Best day for a sunny trip: the day worth taking off this week

What it can do

find_sunny_escapes
Where is there more sun than at home, within a travel time? Filters for lakes, thermal baths, mountains, warmth.
plan_trip
One place on one day: when the sun is out, the next trains, when to leave, what to do, SBB links.
best_day
Which day in the next week is worth a trip, and where to.
home_sun
How sunny it is at home: measured so far today plus the forecast.
fog_line
The top of the fog sea over the Plateau, measured today and forecast for four days.
get_destination
Facts about one of the 387 places.

Forecasts from MeteoSwiss (and Open-Meteo across the border), measurements from SwissMetNet, trains from the Swiss open transport data. Sun is in minutes; “today” means what is left of today.

Limits and privacy

Up to 120 questions a minute per network address, so assistants never wait on each other. Nothing you ask is stored and there is no account: the address of the calling server is counted for about two minutes for the limit, then forgotten. Details in the data protection notice.