Lerwick climate by month
Averages and records for each calendar month at Lerwick, United Kingdom, from 1929 to 2026. The warmest month is August, averaging 14.4°C; the coolest is February at 5.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.6°C | 1.3°C | 12.8°C13 January 1947 | −8.9°C27 January 1952 | 96 / 97 |
| February | 5.5°C | 1.2°C | 11.7°C17 February 1945 | −7.4°C24 February 2010 | 95 / 97 |
| March | 6.4°C | 1.9°C | 13.3°C9 March 1961 | −8.3°C13 March 1947 | 96 / 97 |
| April | 8.1°C | 3.1°C | 16.1°C16 April 1942 | −5.7°C7 April 1968 | 96 / 97 |
| May | 10.5°C | 5.3°C | 20.7°C30 May 1992 | −2.2°C16 May 1934 | 96 / 97 |
| June | 12.7°C | 7.7°C | 23.3°C30 June 1958 | −0.6°C5 June 1931 | 96 / 97 |
| July | 14.3°C | 9.7°C | 23.4°C5 July 1991 | 3.5°C28 July 1965 | 96 / 97 |
| August | 14.4°C | 9.9°C | 22.1°C12 August 1997 | 2.8°C13 August 1943 | 96 / 97 |
| September | 12.8°C | 8.5°C | 20.7°C7 September 2023 | −0.6°C30 September 1954 | 95 / 96 |
| October | 10.4°C | 6.3°C | 17.2°C9 October 1955 | −3.3°C27 October 1948 | 95 / 97 |
| November | 7.9°C | 3.7°C | 14.0°C10 November 2022 | −5.7°C17 November 1962 | 95 / 97 |
| December | 6.5°C | 2.1°C | 12.8°C9 December 2013 | −8.2°C29 December 1961 | 96 / 97 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 95 to 96 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.