4 January – It is announced that Raytheon has been awarded a multi-million pound contract with the Royal Air Force, preserving 200 jobs in North Wales.[6]
18 January – It is announced that a statue of teacher Betty Campbell will be erected in Cardiff, following her selection by a poll of BBC viewers.[7]
19 January – A protest march is attended by several hundred people, opposing the demolition of Cardiff's Guildford Crescent,[8] home to the music venue Gwdihŵ that was scheduled to close on 31 January, prior to being demolished along with adjoining buildings.[9]
1 February – The first of over 1,000 job losses at the Ford engine plant in Bridgend, announced in January, are confirmed, with 370 staff expected to take redundancy by the end of 2019.[12]
8 February – It is confirmed that a body found in the wreckage of the Piper Malibu plane recovered from the English Channel is that of missing Cardiff player Emiliano Sala.[14]
25 February – A temperature of 20.3 °C (68.5 °F) is reported in Trawsgoed, Ceredigion, the UK's highest on record for the month of February[16] until the following day.
26 March – Plaid Cymru AM Helen Mary Jones apologises for an inappropriate remark relating to suicide that she made to Conservative AM Mark Isherwood during a debate at the Senedd, following a complaint by Labour MP Jack Sargeant.[17]
27 March – The High Court rules that Carwyn Jones, Wales's former First Minister, acted unlawfully in intervening in the inquiry into the death of MP Carl Sargeant.[18]
17 April – Bangor City Council reveals that it is seeking an additional £600,000 in funding in order to complete the repairs required to make the Garth Pier safe and reopen it to the public.[20]
23 April – Brecon and Radnorshire MP Chris Davies is fined and sentenced to 50 hours community service for falsifying expenses.[21]
1 May – The Welsh Assembly becomes one of the first governments in the world to declare a national emergency relating to climate change.[24]
3 May – At the Welsh Conservative conference in Llangollen, UK prime minister Theresa May is heckled and told to resign by a member who is subsequently ejected from the meeting.[25]
14 May – Former MP Mark Reckless, having joined the Welsh Assembly as a UKIP representative in 2016 and joined the Conservative group in 2017, announces he has left the Tories and become an independent AM;[26] now representing the Brexit Party.
15 May – Four former UKIP AMs announce that they are joining the Brexit Party.[27]
26 May – The results of the 2019 European Parliament election in the United Kingdom show a total of 271,404 for the Brexit Party, 163,928 for Plaid Cymru and 127,833 for Labour, giving the Brexit Party two seats, while Plaid and Labour win one each. The Conservative Party loses the only seat it won at the last European election in 2014.[29]
13 June – US President Donald Trump refers to Queen Elizabeth II of the United Kingdom as "the queen of England" and to the Prince of Wales as "Prince of Whales" in a Tweet.[35]
14 July – Conservative MP Guto Bebb announces that he will not stand for the party at the next general election because he believes it is dominated by extremists and he supports a second EU referendum.[39]
23 July – First Minister Mark Drakeford warns UK Prime Minister-elect Boris Johnson to show "strategic thinking and honesty" in his future conduct, while Plaid Cymru leader Adam Price calls Johnson a "clown".[40]
Professor Richard B Davies is removed from his post as Vice-Chancellor of Swansea University for "gross misconduct". His colleague, Professor Marc Clement, is also dismissed.[43]
Mohamad Karkoubi, a Syrian refugee, wins the Welsh Learner award at the Nation of Sanctuary Awards, presented by the Welsh Refugee Council.[44]
30 July – New UK prime minister Boris Johnson visits Wales and meets First Minister Mark Drakeford in Cardiff. The president of the Farmers' Union of Wales warns that "civil unrest" in rural areas could arise if a "no-deal" Brexit takes place.[47]
9 August – On the penultimate day of the National Eisteddfod, a campsite has to be evacuated due to adverse weather conditions, and a planned open-air performance by Dafydd Iwan is moved to the main pavilion.[51]
13 August – The director of Swansea developer Enzo's Homes, along with a contractor, is convicted of illegally felling 70 protected trees in the Penllergaer area.[52]
16 August – On a visit to Machynlleth, UK Labour Party leader Jeremy Corbyn states that he has "discussed with Mark Drakeford issues of further powers that the Welsh Government or Welsh Parliament would like to have under a Labour Government," adding, "We're open to considering all of that, we're open to considering any future relationship and ideas."[53]
28 August – The National Assembly of Wales is recalled from recess at the request of First Minister Mark Drakeford, in order to discuss the actions of the Westminster government with reference to Brexit. The first plenary session is scheduled for 5 September.[54]
14 September – Former Welsh rugby international Gareth Thomas announces that he has learned he is HIV positive,[56] with undetectable/untransmittable status, and wants to help break the stigma surrounding his condition.[57]
4 October – Plaid Cymru leader Adam Price predicts that a referendum on Welsh independence is likely to be held in the next decade.[58]
9 October – Assembly members support a motion to rename the Welsh Assembly; in future it will be called both Senedd Cymru and the Welsh Parliament.[59]
10 October – The Welsh Government publishes Reforming Our Union: Shared Governance in the UK, a policy document setting out its proposals for reform of the union.[60]
30 October – The Conservative Party suspends former Assembly candidate Ross England after learning of his conduct during a rape trial during 2018.[61]
5 November - A leaked e-mail leads to calls for Welsh Secretary Alun Cairns to resign as it is revealed that he was told about the involvement of Conservative Assembly candidate Ross England in "sabotaging" a rape trial in 2018.[62]
6 November - Welsh Secretary Alun Cairns resigns from the Cabinet over the Ross England scandal.[63]
The remains of a World War II Lockheed P-38 Lightning that crashed into the sea near Harlech, nicknamed the "Maid of Harlech", are given scheduled status by Cadw.[64]
Sir Roderick Evans resigns as Commissioner for Standards at the Welsh Assembly, after it is revealed that former AM Neil McEvoy has secretly recorded confidential conversations between him and his staff. McEvoy claims that the recordings were made in the public interest.[65]
13 November - Former MP Christopher Davies stands down as prospective Conservative candidate for Ynys Môn in the forthcoming UK general election amid complaints about his selection from party members.[66]
3 December - Kizzy Crawford is among those critical of the proposed design of the 2021 census return form, which includes categories for "Black British" and "white Welsh" but not for "Black Welsh".[68]
12 December - In the 2019 United Kingdom general election in Wales, the Labour Party loses six seats to the Conservative Party. There is an 8% decrease in Labour's share of the vote, matched by increases in vote share for the Brexit Party and Conservative Party of 5.4% and 2.5%, respectively. The Labour Party receives 40.9% of overall votes, of a total of 1,544,357 votes (representing 66.6% of the electorate).[69] Welsh Liberal leader Jane Dodds loses the seat she won earlier in the year to Conservative Fay Jones.[70]
20 December - An inquiry into former Welsh Secretary Alun Cairns's conduct over the Ross England rape trial incident finds that it is "unlikely" that Cairns knew nothing about Ross England's role in the trial, but there is no evidence to contradict his statement that he did not know about the details of the case.[72]