yr.no is included in the HA. This have been pretty shit from the start.
This is great integration, keep up the good work guys!
I’m not having actual problem / issue with integration, more like templating forecast data. I’d like to calculate heating degree day-number (lämmitystarveluku, FMI page on subject) for next day. Forecast data includes per hour temp forecast for next day and therefore, it should be possible to calculate. My idea is, that based on heating degree day forecast one could more accurately predict heating requirements and say, if electricity is cheap today, heat up energy storage in advance.
I remember HA Developer tools used to have long list of forecast attributes before, including temp, but it’s now remarkably shorter. However, this data is still available in weather card.
Any ideas how to calculate and template this data? It outputs just single number.
EDIT 21.07.2024:
Degree day calculation (lämmitystarveluku S17) template is now here
Hi Anand,
I installed the latest version of fmi 0.5.3 that was released in July 2024. I clreared the brower cache. Placed all files in custom component >fmi folder in HA directory. But in integration fmi is not showing even after restarting the HA. Could you please guide me on this.
I am using following versions
Core Home Assistant: 2024.10.1
Raspberry 5
Supervised Home Assistant: 2024.10.0
Using Duckdns domain
This integration stoopped working after core update 2024.10.2. Is there anything to do to get it working again?
3 Likes
+1
Can’t get it to work anymore in 2024.10.2.
It seem to be working for me in apexcharts, but not in history view. Same thing with YR integration. So waiting for fixing in 2024.10.3
Seem to be something strange, because history view just started to work for both integrations.
2024.10.3 update did fix this.
Broken again after core 2025.1.0 update.
File “/config/custom_components/fmi/sensor.py”, line 7, in
from homeassistant.const import (
…<7 lines>…
)
ImportError: cannot import name ‘SPEED_METERS_PER_SECOND’ from ‘homeassistant.const’ (/usr/src/homeassistant/homeassistant/const.py)
Works great, thanks a lot! Do you know how can I make these available as sensors? I’d like to make an automation that uses the data.
Is it possible to get solar power predictions also through this FMI integration? FMI does publish this info but I take it has not been pulled from FMI
Hi, does anyone have problems with the forecast values? For Riihimäki I am getting:
…while it should be considerably warmer for the day’s highs
I am using the integration in another locations and results seem the same…
edit: similar observations: Observation data possible? · Issue #56 · anand-p-r/fmi-hass-custom · GitHub
For the FMI integration I don’t know if it would be possible, but I recently switched to Solcast integration and it has provided so far very accurate predictions. The setup is not the easiest to predict with two arrays, one facing east and the other west.
Today however seems to be an exception 
…but all in all have been very happy with this. Looking at the whole month the prediction (dotted line) has hit quite close to the actual production (bars):
Solcast is free for personal use (limited api calls though but the integration handles it nicely).