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FI Charts ( T120+ onwards) Summer 2025 **READ MOD NOTE IN FIRST

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  • Registered Users, Registered Users 2 Posts: 4,786 ✭✭✭KungPao


    @Akrasia look up the Portuguese Riviera, between Cascais and Lisbon. That’s the sweet spot, this coming week it’s forecast for min 18, and highs of 22c to 26c. Beautiful. That’s a relief for too hot and too shite like our climate.



  • Moderators, Science, Health & Environment Moderators Posts: 17,640 Mod ✭✭✭✭Gonzo


    It's looking more likely the upcoming warm spell could last as far as Monday which could mean a very warm and quite sunny weekend to come for many.

    While it does turn cooler from Monday it remains to be seen what happens next week, we could have a second reload of high pressure and back to warmer temperatures but the 00Z is a bit of an outlier with regards to next week, but there is definitely potential for us to have another go at heat later next week. There is likely to be 2 warm spells this month, one starting tomorrow and another potentially later next week or into the following week. I'd love to think we could bag another warm spell for August.

    image.png
    Post edited by Gonzo on


  • Moderators, Science, Health & Environment Moderators Posts: 17,640 Mod ✭✭✭✭Gonzo


    6Z rolling out and keeps the mid 20s going until Monday evening, so definite upgrades since yesterday afternoon. While next week will be cooler, there won't be much relief for eastern areas with temperatures set to remain in the low 20s throughout next week with thunderstorms possible at times, but I think we need a few more days to iron out next week. If we combine the very warm weather over the next 5 days with still relatively warm conditions for next week July is likely to finish up very much warmer than average month. Not much sign of rain over the next while unless we get thunderstorms or showers. Looking forward to todays 12z sets from the models.



  • Registered Users, Registered Users 2 Posts: 214 ✭✭Hairypoppins


    Relief ?I look forward to these upgrades for the Dublin region , music to my ears



  • Moderators, Science, Health & Environment Moderators Posts: 17,640 Mod ✭✭✭✭Gonzo


    by Monday we could have 4 days of mid to high twenties, relief for some maybe such as those stuck in retail in a very sticky environment over the weekend. For Dublin it looks like staying warm for much of next week, probably low 20s rather than the mid twenties of the weekend and possibly Monday.

    Just looking at the UKV charts and temperatures in Dublin by night may struggle to get much lower than 20C this weekend. Just glad none of us are in London over the next week and using the London Underground, that will be heat on a whole another level.

    Post edited by Gonzo on


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  • Registered Users, Registered Users 2 Posts: 3,563 ✭✭✭Dazler97


    And if that happens we will beat our lowest highest temperature record again , we've never had a tropical night here in Ireland let's see if we can get one this time but it will make nights rather very uncomfortable to sleep



  • Registered Users, Registered Users 2 Posts: 14,052 ✭✭✭✭sryanbruen


    There's been 7 tropical nights on record in Ireland before, most recently in July 2021.

    Remember that the min has to be above 20C for 24 hours between 09-09 for it to be considered a tropical night. That's the Met's definition, not mine in case one says "how is that a tropical night when it's determined by the temperature of the previous morning".

    Screenshot 2025-07-08 at 14.45.32.png

    Photography site - https://sryanbruenphoto.com/



  • Registered Users, Registered Users 2 Posts: 150 ✭✭ClimateObserver


    Excellent data @sryanbruen

    The term 'tropical night' is probably a poor term for what really is measured, a 24hr-period where the temperature fails to drop below 20°C. I guess the reason is that prior to electronic sensors, etc… most climate data was gathered by observers who would only take readings once a day at 09UTC (9am, or 10am in the summer when the clocks go forward). Thus in order to establish if a tropical night in it's literal sense would require the minimum temperature thermometer to be reset at 10pm (or whenever sunset happened). This would require two visits for the observer, more note-taking, etc… In today's world it probably doesn't seem like a big thing/ask - but half a century ago and more it would have been an inconvenience.



  • Registered Users, Registered Users 2 Posts: 14,052 ✭✭✭✭sryanbruen


    That is indeed the reason and if we were to go by a better, more relevant or accurate definition then we'd be throwing away all the historical data above minus Valentia from July 2021. There's still climate stations that are manually read too even today.

    I think the UK Met keep records for 21-09 minimum temps (separate from the climatological 09-09 records) but not in the public domain. I don't believe Met Éireann do the same but it wouldn't do any harm I would have thought and it would be interesting at least for food for thought if nothing else for the weather nerd in us.

    Photography site - https://sryanbruenphoto.com/



  • Registered Users, Registered Users 2 Posts: 3,563 ✭✭✭Dazler97


    Omg apologies for that , I don't know how I didn't know , my bad :/ thanks syran you are a legend 😀



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  • Registered Users, Registered Users 2 Posts: 312 ✭✭Ros4Sam24


    Icon is one of the first runs I have seen that the low pressure properly undercuts. This could be the best way to get a thundery breakdown.

    IMG_0711.jpeg


  • Moderators, Science, Health & Environment Moderators Posts: 17,640 Mod ✭✭✭✭Gonzo


    Turning warm to hot by Friday in many places. Expect Dublin and Galway pubs to be rammed.

    image.png

    Widespread high 20s across the whole country on Saturday. Not the best of days to be buying chocolate in the Supermarket as it will be half melted!

    image.png

    Cooler on Sunday but still impressively warm and plenty of hangovers.

    image.png

    Heat moderates alot on Monday but still pleasantly warm in places. Expect many burnt faces back in the office by Monday morning.

    image.png

    This will be the highlight weekend of 2025.



  • Registered Users, Registered Users 2 Posts: 2,295 ✭✭✭squarecircles


    don’t want a breakdown, want the heat to continue and proliferate through the rest of the summer and scorch the place to dust.



  • Registered Users, Registered Users 2 Posts: 312 ✭✭Ros4Sam24




  • Registered Users, Registered Users 2 Posts: 14,052 ✭✭✭✭sryanbruen


    31C spotted on latest UKV for Sunday. 30C on Saturday too.

    image.png image.png

    Photography site - https://sryanbruenphoto.com/



  • Registered Users, Registered Users 2 Posts: 6,286 ✭✭✭Elmer Blooker


    an interruption with thunderstorms in places followed by quick return to fine weather, that’s what I think will happen, it happens in the good summers and I’m becoming more convinced by the day that this one will be in the ‘good summer’ category when post mortems are done at the end of August.

    21AE9351-611F-4E44-9864-B6051B6BEC3A.gif


  • Registered Users, Registered Users 2 Posts: 312 ✭✭Ros4Sam24


    Very nice Gfs 18z, makes Tuesday another hot day with mid 20s

    IMG_0713.jpeg


  • Moderators, Science, Health & Environment Moderators Posts: 17,640 Mod ✭✭✭✭Gonzo


    that 18z has to be an outlier, 25 to 30C from Friday to Tuesday, then 19 to 24C rest of the week. We are potentially looking at 7 to 10 days of temperatures well above average especially in Eastern and Southern areas. The West and everywhere will be very warm till at least Monday to Tuesday. We don't exactly get this every summer so make the most of it!



  • Registered Users, Registered Users 2 Posts: 150 ✭✭ClimateObserver




  • Registered Users, Registered Users 2 Posts: 2,295 ✭✭✭squarecircles


    2 warm cloudy days then back to slosh.

    IMG_9711.jpeg


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  • Registered Users, Registered Users 2 Posts: 14,052 ✭✭✭✭sryanbruen


    It tends to overcook slightly and its high res often leads to strange temperature distributions.

    Photography site - https://sryanbruenphoto.com/



  • Registered Users, Registered Users 2 Posts: 6,488 ✭✭✭highdef


    I think you may need to move house from Donegal if you want to experience warmer weather. Even my location in the north Midlands is looking very nice for the rest of this week.

    image.png


  • Registered Users, Registered Users 2 Posts: 150 ✭✭ClimateObserver


    I'd be wary of those day-to-day summary chart icons - the hour-by-hour ones are more representative, even if not fully accurate either. What part of the country is that chart for?



  • Registered Users, Registered Users 2 Posts: 6,488 ✭✭✭highdef


    Out of interest, what part of Donegal do you live in? I've looked at a few locations in Donegal and the automated Met Eireann forecast is showing decent weather in several parts of Donegal for the rest of this week:

    Letterkenny:

    image.png

    Dungloe:

    image.png

    Bundoran:

    image.png

    An important thing to take into account when looking at these overview/daily forecasts is that the weather symbol shown will be what the weather conditions are expected to be at 13:00 local time. When we are not observing IST (Irish Standard Time), then the time is 12:00 local time.

    So if we take Letterkenny as an example, the overview/daily forecast is showing partly cloudy conditions for this Friday:

    image.png

    However, if we look at the hourly breakdown for the day, you can see that it's forecast to be partly cloudy until 13:00, then fair around 14:00 and after that, clear for the rest of the day.

    image.png

    Now I'm not saying that the above is exactly how things will pan out. What I am saying is that you need to look at the hour by hour forecast to get some finer details rather than just look at the overview/daily forecast.

    Better still, read the written forecast as this will have been written by a human following analysis of the weather data. The forecasts above are produced using raw data and without any input from the human meteorologists.



  • Registered Users, Registered Users 2 Posts: 2,295 ✭✭✭squarecircles


    I did read the human written forecast. It’s trash for the west, cloudy Saturday, clouding over Sunday with showery rain. Cool showery next week with longer spells of rain.

    IMG_9730.jpeg


  • Registered Users, Registered Users 2 Posts: 6,488 ✭✭✭highdef


    I'd have to disagree. Mid 20's in the west for the weekend is excellent. Even if it was fully cloudy with those temperatures, it would still be very nice, perhaps even too warm for some. Looking at the daily automated forecast for Westport in Mayo, which is in the far northwest and would be in the area of the country where the least "nice" weather occurs, the weekend looks great for outdoor activities.

    image.png


  • Registered Users, Registered Users 2 Posts: 3,008 ✭✭✭.Donegal.




  • Registered Users, Registered Users 2 Posts: 6,488 ✭✭✭highdef


    Ah thank you for clarifying. Glad I used Westport in my example above so!



  • Registered Users, Registered Users 2 Posts: 2,295 ✭✭✭squarecircles


    . .



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