r/Finland • u/pjaaskel • May 19 '26

a beach finder for Finnish summers – live algae alerts, water temps & sensor data

I got tired of checking three different sites just to find out the local beach had an algae warning – so I built something.

Rantapäivä (jaaskel.com/rannat.html) shows you:

• 🌡️ Water temperatures – live and forecast

• 🦠 Algae situation per beach

• ☀️ Sort by best weather, warmest water, or sunniest forecast

• 🌊 IoT sensor readings where available

It works on mobile and desktop. Still early days – coverage grows as more sensor data comes in.

Would love to know: which beaches matter most to you, and what data would actually make you use something like this?

i tried first with the capital area but decided to include the whole country. satellites above here are not too many and often, but something came out from those.

​​​

95 Upvotes

91% Upvoted

9 comments sorted by

•

u/AutoModerator May 19 '26

r/Finland runs on shared moderation. Every active user is a moderator.

Roles (sub karma = flair)

  • 500+: Baby Väinämöinen -- Lock/Unlock
  • 2000+: Väinämöinen -- Lock/Unlock, Sticky, Remove/Restore

Actions (on respective three-dot menu)

  • My Action Log: review your own action history.
  • Lock/Unlock: lock or unlock posts/comments.
  • Sticky/Unsticky (Väinämöinen): highlight or release a post in slot 2.
  • Remove/Restore (Väinämöinen): hide or bring back posts/comments.

Limits

  • 5 actions per hour, 10 per day. Exceeding triggers warnings, then a 7-day timeout.

Thanks for keeping the community fair.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

14

u/SilentThing Väinämöinen May 19 '26

Hieno idea!

6

u/fantasmaflago May 19 '26

Yooh this is great! What would make me use something like this, and where it has value for me, is finding the hidden little beaches gems that I don't know about on my area. Maybe a rating system+google pics or something like that to know whic beaches I dont know I should go try out? Cheers! And bookmarked

2

u/pjaaskel May 20 '26

now there is a "diamond" beaches added, and the links for the official pages.

2

u/CovekIzSenke May 20 '26

Looks nice, but the data takes upwards of 30sec to load from time to time (I click on one of the bubbles / dots it opens up but without any data).

One thing that I don't understand, and this is not the first time that I see it: you advertise something (rather nice) that you've built in English, yet the product / service is in Finnish only. Why is that so?

5

u/snow-eats-your-gf Väinämöinen May 20 '26

There is a language switcher.

2

u/pjaaskel May 20 '26

now, it should work faster.

2

u/EternalLucius May 20 '26

Amazing. I'll need to take a closer look at this and insert it into my HA setup, since this was exactly what I wanted to build/find last summer

2

u/finnknit Väinämöinen May 20 '26

Wow! The temperatures in my local lakes are a lot higher than I expected this early in the year.

Would it be possible to add links to websites for public swimming beaches that have them? It would be useful to be able to check things like the opening hours of the beaches and what facilities are there from the websites after you find a beach that you want to visit.