Hottest day of each year
United Kingdom
2021: 32.2°C at Heathrow on July 20th
2020: 37.8°C at Heathrow on July 31st
2019: 38.7°C at Cambridge Botanic Gardens on July 25th
2018: 35.6°C at Felsham on July 26th
2017: 34.5°C at Heathrow on June 21st
2016: 34.4°C at Gravesend on September 13th
2015: 36.7°C at Heathrow on July 1st
2014: 32.3°C at Swancombe Marsh on July 18th
2013: 34.1°C at Heathrow on August 1st
2012: 32.4°C at Cavendish on August 18th
2011: 33.1°C at Gravesend on June 27th
2010: 31.7°C at Gravesend on July 9th
2009: 31.8°C at Wisley on June 30th
2008: 30.2°C at Cambridge on July 28th
2007: 30.1°C at Terrington St. Celement & Wisbech on August 5th
2006: 36.5°C at Wisley on July 19th
2005: 32.6°C at Heathrow on June 19th
2004: 31.5°C at Northolt on August 8th
2003: 38.5°C at Brogdale on August 10th
2002: 32.6°C at Northolt on July 29th
2001: 32.2°C at Northolt on June 26th
2000: 32.6°C at Coltishall on June 19th
1999: 32.7°C at Heathrow on August 1st & Honington on August 2nd
1998: 32.2°C at Gravesend on August 10th
1997: 33.1°C at Wellesbourne on August 10th
1996: 33.2°C at Rickmansworth on July 22nd
1995: 35.2°C at Boxworth on August 1st
1994: 33.4°C at Morley St. Botolph on July 12th
1993: 29.7°C at East Bergholt on July 4th
1992: 30.3°C at Malvern on June 29th
1991: 32.1°C at Cromer on July 11th
1990: 37.1°C at Cheltenham on August 3rd
1989: 34.4°C at Mickleham on July 22nd
1988: 30.2°C at Cheltenham on August 7th
1987: 30.1°C at Northolt on August 20th
1986: 32.0°C at Rustington on June 28th
1985: 30.1c at St Louis on July 13th
1984: 31.9°C at St Louis on August 20th
1983: 33.0°C at Hampton on July 15th & East Bergholt on July 16th
1982: 30.7°C at Morley St. Botolph on August 3rd
1981: 29.5°C at Kew on August 5th
1980: 29.4°C at Cors Fochno on June 4th
1979: 30.4°C at Benson on July 27th
1978: 28.8°C at Poolewe on June 4th
1977: 30.0°C at Paisley, Glenlee on July 7th & Onich on July 11th
1976: 35.9°C at Cheltenham on July 3rd
1975: 34.2°C at Heathrow & Stanstead Abbotts on August 8th
1974: 28.0°C at Southampton on June 15th
1973: 32.1°C at Southampton on August 14th
1972: 29.4°C at Perth on July 20th
1971: 30.3°C at Rugby on July 11th
1970: 32.2°C at Aldenham & Stratford-upon-Avon on July 7th
1969: 32.8°C at Letchworth on July 16th
1968: 33.3°C at Camden Square on July 1st
1967: 30.2°C at Watnall on July 17th
1966: 28.9c at Southampton on July 9th; Perth & Crossmyloof on July 21st; Camden Square on August 20th
1965: 28.9°C at Kensington Palace on May 14th
1964: 32.8°C at Cromer on August 26th
1963: 28.9°C at Littlehampton on July 22nd; Ceinws on July 29th; Wisley & Gordon Castle on July 30th
1962: 27.8°C at Writtle on September 3rd
1961: 33.9°C at Regents Park, Camden Square & Gillingham on July 1st
1960: 30.6°C at Wyton on June 18th
1959: 34.4°C at Cromer on July 5th
1958: 29.4°C at Paisley on July 4th & 5th; Leicester on July 8th
1957: 35.6°C at Camden Square on June 29th
1956: 30.0°C at Camden Square on July 26th
1955: 32.8°C at Jersey on August 21st
1954: 30.6°C at Camden Square on September 1st
1953: 33.9°C at Camden Square on August 12th
1952: 33.9°C at Jersey on July 1st
1951: 30.0°C at Southend on July 28th
1950: 33.3°C at Camden Square on June 6th
1949: 33.3°C at Worcester on July 12th
1948: 35.0°C at Milford on July 28th
1947: 34.4°C at Waddington on June 3rd
1946: 30.6°C at London on July 2nd; Finningley on July 12th; Greenwich & Maldon on July 24th
1945: 32.2°C at Norwich & Whitstable on July 15th
1944: 32.8°C at Tunbridge Wells, Horsham & London on May 29th; Long Sutton on May 30th
1943: 33.9°C at Worcester & Croydon on July 31st
1942: 33.9°C at Sprowston on August 27th
1941: 34.4°C at Camden Square on June 22nd
1940: 32.8°C at Cranwell on June 9th
1939: 32.2°C at Camden Square on June 7th
1938: 30.6°C at Camden Square & Reading on August 1st
1937: 33.3°C at Canterbury & Tunbridge Wells on August 7th
1936: 31.7°C at Camden Square on June 20th & 21st
1935: 33.3°C at Attenborough on July 13th
1934: 33.3°C at Attenborough on July 11th
1933: 34.4°C at Margate & Cambridge on July 27th
1932: 36.1°C at Halstead, Tottenham, Camden Square, Regent's Park & Enfield on August 19th
1931: 28.3°C at Bromley on June 14th
1930: 34.4°C at Camden Square on August 29th
1929: 32.2°C at Camden Square & Margate on August 31st; Newport on September 8th
1928: 32.8°C at Camden Square & Newport on July 15th
1927: 29.4°C at Camden Square on June 16th
1926: 32.2°C at Camden Square on September 19th
1925: 33.3°C at Hunstanton on July 22nd
1924: 32.2°C at Camden Square on July 12th
1923: 35.6°C at Camden Square on July 13th
1922: 32.8°C at Camden Square on May 22nd
1921: 34.4°C at Woking & Halstead on July 11th
1920: 27.8°C at Raunds on June 17th
1919: 32.2°C at Raunds on September 11th
1918: 33.9°C at Canterbury on August 22nd
1917: 33.9°C at Reading & Little Massingham on June 17th
1916: 30.0°C at Woking on July 30th; Salisbury on July 31st
1915: 32.2°C at Cromer & Norwich on June 8th
1914: 32.2°C at Woking, New Malden & Wisley on July 1st
1913: 29.4°C at New Malden on June 16th
1912: 32.8°C at Tottenham on July 12th
1911: 36.7°C at Raunds & Canterbury on August 9th
1910: 28.9°C at Maidenhead on June 20th
1909: 33.3°C at Epsom on August 15th
1908: 32.8°C at Dumfries on July 2nd
1907: 30.0°C at Lairg on July 16th
1906: 35.6°C at Bawtry on September 1st
1905: 30.0°C at Bawtry on July 14th
1904: 32.2°C at Margate on August 4th
1903: 31.3°C at Wryde on July 10th
1902: 31.9°C at Hereford on June 28th
1901: 33.3°C at Newton Rigg, Bawtry & Colly Weston on July 19th
1900: 35.1°C at Cambridge on July 20th
1899: 32.4°C at Cambridge on August 25th
1898: 33.3°C at Cambridge on September 8th
1897: 32.2°C at Cambridge on August 5th
1896: 31.2°C at Norwood on July 14th
1895: 30.6°C at Stratfield Turgis on September 25th/27th
1894: 30.6°C at Weston-super-Mare on July 1st
1893: 34.7°C at Wryde on August 18th
1892: 29.4°C at Cambridge on July 3rd
1891: 30.0°C at Loughborough on September 10th
1890: 28.3°C at Llandovery on September 6th
1889: 30.3°C at Regents Park on August 1st
1888: 31.1°C at Cambridge on June 25th
1887: 31.7°C at Cambridge on July 3rd
1886: 31.7°C at Southampton on July 4th
1885: 33.3°C at Southampton on July 26th
1884: 34.1°C at Hillington on August 11th
1883: 28.7°C at Norwood & Tunbridge Wells on June 29th
1882: 29.2°C at Portsmouth on August 6th
1881: 35.0°C at Camden Square on July 15th
1880: 30.7°C at Loughborough on September 4th
1879: 26.8°C at Hillington on July 29th
1878: 33.9°C at Llandudno on June 27th
1877: 29.7°C at Stratfield Turgis on June 18th
1876: 35.0°C at Cambridge on August 14th
1875: 30.1°C at Hillington on August 16th
Some facts or trivia about UK's hottest days
An absolute maximum temperature of 34°C or more has been seen in the UK in 30 years since 1875 {1876, 1884, 1893, 1900, 1906, 1911, 1921, 1923, 1930, 1932, 1933, 1941, 1947, 1948, 1957, 1959, 1975, 1976, 1989, 1990, 1995, 2003, 2006, 2013, 2015, 2016, 2017, 2018, 2019, 2020}. 34°C was achieved for 6 consecutive years somewhere in the UK between 2015 and 2020 which is by far the longest run of 34°C years on record beating 2 consecutive years in 1932/33, 1947/48, 1975/76 and 1989/90.
Of the years above, 35°C has been achieved in 15 years since 1875 {1906, 1911, 1923, 1932, 1948, 1957, 1976, 1990, 1995, 2003, 2006, 2015, 2018, 2019, 2020}.
36°C or more has been achieved in 8 years since 1875 {1911, 1932, 1990, 2003, 2006, 2015, 2019, 2020}.
37°C or more has been achieved in 4 years since 1875 {1990, 2003, 2019, 2020} albeit each of them have all been since 1990!
38°C or more has been achieved in 2 years since 1875 {2003 and 2019}.
30°C has been failed to be achieved on a single day of a calendar year in the UK in 21 years since 1875 {1877, 1879, 1882, 1883, 1892, 1910, 1913, 1920, 1927, 1931, 1958, 1962, 1963, 1965, 1966, 1972, 1974, 1978, 1980, 1981, 1993}. The lowest annual absolute max temperature was recorded in the extraordinary cold year of 1879 with only 26.8°C.
Hottest days in the UK for each extended summer month on record
May 32.8°C Camden Square 22 May 1922
32.8°C Horsham 29 May 1944
32.8°C Tunbridge Wells 29 May 1944
32.8°C Regent's Park 29 May 1944
32.2°C Camden Square 31 May 1947
June 35.6°C Southampton 28 June 1976
35.6°C Camden Square 29 June 1957
35.5°C Southampton 27 June 1976
35.4°C North Heath 26 June 1976
34.4°C Heathrow 21 June 2017
34.4°C Waddington 03 June 1947
July 38.7°C Cambridge Botanic Gardens 25 July 2019
37.8°C Heathrow 31 July 2020
36.7°C Heathrow 01 July 2015
36.5°C Wisley 19 July 2006
35.9°C Cheltenham 03 July 1976
August 38.5°C Faversham 10 August 2003
37.1°C Cheltenham 03 August 1990
36.7°C Raunds 09 August 1911
36.1°C Camden Square 19 August 1932
36.1°C Tottenham 19 August 1932
September 35.6°C Bawtry 02 September 1906
35.0°C Maidenhead 01 September 1906
34.6°C Raunds 08 September 1911
34.4°C Gravesend 13 September 2016
34.2°C Westley 03 September 1906
The history of the UK's hottest day
2019 38.7°C Cambridge Botanic Gardens 25 July
2003. 38.5°C Faversham 10 August
1990 37.1°C Cheltenham 03 August
1911 36.7°C Raunds 09 August
Republic of Ireland
2021: 31.2°C at Durrow on July 22nd
2020: 27.1°C at Newport (Furnace) on June 1st
2019: 29.8°C at Ardfert (Liscahane) on June 27th
2018: 32.0°C at Shannon Airport on June 28th
2017: 28.6°C at Phoenix Park on June 21st
2016: 30.4°C at Mount Dillon on July 19th
2015: 26.1°C at Dublin (Glasnevin) on June 30th
2014: 28.8°C at Durrow on July 25th
2013: 31.0°C at Dooks on July 19th
2012: 28.3°C at Ardfert (Liscahane) on May 25th
2011: 26.0°C at Cavan (Drumconnick) & Athy (Chanterlands) on June 3rd
2010: 27.1°C at Elphin on May 22nd and Ardee (Boharnamoe) on May 23rd
2009: 28.6°C at Galway (University College) on June 2nd
2008: 25.9°C at Ardtamon on July 27th and Cork (Clover Hill) on July 28th
2007: 27.0°C at Dooks on June 9th and Cavan (Drumconnick) on June 11th
2006: 32.3°C at Elphin on July 19th
2005: 30.3°C at Kildalton on July 12th
2004: 28.2°C at Adare Manor on August 2nd
2003: 30.4°C at Boora on August 8th
2002: 26.5°C at Cavan (Drumconnick) on August 5th
2001: 28.4°C at Ardee (Boharnamoe) on July 28th
2000: 28.5°C at Cavan (Drumconnick) on June 18th
1999: 28.0°C at Warrenstown and Athy (Chanterlands) on July 9th
1998: 26.7°C at Cork (Clover Hill) on August 8th
1997: 28.4°C at Ardfert on May 31st
1996: 27.0°C at Ardfert (Liscahane) and Shannon Airport on June 16th, Kilfinnane Education Centre and Killarney (Muckross Hse.) on June 17th
1995: 31.5°C at Carlow (Oak Park) on August 1st
1994: 26.8°C at Portlaoise (Coolnamona) on August 1st
1993: 26.1°C at Boora on June 28th
1992: 26.5°C at Derrygreenagh on June 29th
1991: 28.4°C at Cahirciveen on September 5th
1990: 31.0°C at Dublin (Glasnevin) on August 2nd
1989: 30.5°C at Lanesboro (Doire Dharog) on July 19th
1988: 26.0°C at Dungarvan (Carriglea) on June 23rd
1987: 27.3°C at Dublin (Phoenix Park) on August 16th
1986: 27.0°C at Clonsast (Bord na Móna) on June 27th
1985: 25.1°C at Dublin (Merrion Square) on July 2nd & September 30th
1984: 27.9°C at Cork (Clover Hill) on July 27th
1983: 32.2°C at Carlow (Oak Park) on July 14th
1982: 27.0°C at Glencolumbkille (Drimroe) on June 4th and Kilkenny on August 3rd
1981: 26.2°C at Cork (Clover Hill) on August 25th
1980: 26.5°C at Enniscorthy (Voc. Sch.) on August 20th
1979: 25.8°C at Enniscorthy (Voc. Sch.) on July 16th & 17th, Ballybrittas on July 27th and Dublin (Glasnevin) on July 28th
1978: 26.5°C at Boora on May 31st
1977: 28.7°C at Ballybrittas on July 7th
1976: 32.5°C at Boora on June 29th
1975: 31.5°C at Ballybrittas on August 3rd
1974: 26.5°C at Ballyvaughan on June 21st
1973: 28.7°C at Boora on August 15th
1972: 28.7°C at Killarney (St. Finans Hosp.) on July 19th
1971: 26.9°C at Enniscorthy (Voc. Sch.) on July 8th
1970: 27.9°C at Warrenstown on June 10th
1969: 29.6°C at Fermoy (Moore Park) on July 15th
1968: 26.6°C at Tuam (Airglooney) on June 12th
1967: 26.4°C at Ballybrittas on June 17th
1966: 26.2°C at Ballincurra on July 22nd
1965: 25.2°C at Ballybrittas on June 29th
1964: 26.0°C at Ballybrittas on August 3rd
1963: 26.8°C at Dublin (Rathfarnham Castle) on July 30th
1962: 25.0°C at Clonsast (Bord na Móna) on June 8th
1961: 28.4°C at Gurteen (Agr. Coll.) on September 1st
1940: 28.9°C at Birr Castle & Rathfarnham on June 8th/Glasnevin & Trinity College on August 9th
1939: 28.9°C at Carrick-on-Suir & Cork on June 6th
1938: 25.6°C at Birr Castle & Foynes on August 3rd
1937: 27.8°C at Hazelhatch on August 2nd
1936: 26.7°C at Glasnevin & Hazelhatch on August 29th/Cork on August 31st
1935: 27.2°C at Newcastle on July 13th
1934: 32.2°C at Foynes on July 9th
1933: 30.0°C at Kilkenny on July 4th
1932: 27.2°C at Newcastle on July 9th
1931: 25.6°C at Foynes on August 5th
1930: 27.2°C at Newcastle on August 27th
1929: 27.2°C at Kilkenny, Foynes & Mountmellick on July 14th/Foynes on July 15th
1928: 28.3°C at Killarney on July 22nd
1927: 26.7°C at Mountmellick on May 7th
1926: 29.4°C at Mountmellick, Kilkenny & Killarney on July 14th
1925: 30.0°C at Killarney on June 9th
1924: 23.9°C at Dublin City on July 15th
1923: 30.0°C at Waterford (Gortmore) on July 12th
1922: 27.8°C at Killarney on May 30th/Foynes & Glasnevin on May 31st
1921: 32.2°C at Killarney on July 12th
1920: 25.0°C at Birr Castle on May 25th
1919: 27.2°C at Carrick-on-Suir on August 14th
1918: 28.9°C at Killarney on June 1st/2nd
1917: 26.1°C at Glasnevin on July 13th
1916: 29.4°C at Killarney on August 6th
1915: 25.6°C at Killarney on June 22nd
1914: 27.2°C at Mountmellick on July 11th/Kilkenny on July 21st
1913: 26.7°C at Wexford on August 14th/Waterford (Trg. Coll.) on August 15th
1912: 24.4°C at Roches Point on July 15th/16th
1911: 31.1°C at Killarney on July 13th
1910: 26.1°C at Limerick (Mungret College), Birr Castle & Killarney on July 14th
Some facts or trivia about the Republic of Ireland's hottest days
An absolute maximum temperature of 30°C or more in the Republic of Ireland has been achieved in 18 years since 1910 {1911, 1921, 1923, 1933, 1934, 1975, 1976, 1983, 1989, 1990, 1995, 2003, 2005, 2006, 2013, 2016, 2018, 2021} but this includes a gap in years currently available between 1940 and 1961 (not inclusive) whilst it was unlikely 30°C was recorded in any year during this period.
Of the years above, 31°C has been achieved in 12 years since 1910 {1911, 1921, 1934, 1975, 1976, 1983, 1990, 1995, 2006, 2013, 2018, 2021}.
32°C or more has been achieved in 6 years since 1910 {1921, 1934, 1976, 1983, 2006, 2018}.
No years since 1910 have achieved 33°C or more and 1887 remains the only year to do so when Ireland recorded 33.3°C at Kilkenny Castle which is still the national record as of 2021.
Hottest days in the Republic of Ireland for each extended summer month on record (incomplete)
May 28.4°C Ardfert 31 May 1997
28.3°C Ardfert 25 May 2012
27.8°C Glasnevin 31 May 1922
27.8°C Killarney 30 May 1922
27.2°C Ballyshannon 26 May 2017
June 33.3°C Kilkenny Castle 26 June 1887
32.5°C Boora 29 June 1976
32.0°C Shannon Airport 28 June 2018
31.6°C Ardfert 27 June 2018
July 32.3°C Elphin 19 July 2006
32.2°C Foynes 09 July 1934
32.2°C Killarney 12 July 1921
August 31.5°C Oak Park 02 August 1995
31.5°C Ballybrittas 03 August 1975
September 29.1°C Clongowes Wood College 01 September 1906