Updated: 2026-07-31
If you've ever wondered just how hot it can get around Glasgow, the Met Office's long-running records give a clear answer: the hottest week ever recorded near the city was 15–21 July 1972, when the average daily maximum temperature over seven consecutive days reached 26.4°C at the Aberfoyle station. This stands as the peak heat event in more than three decades of continuous weather observations.
Let me be clear about what these numbers represent: I'm describing measurements taken at the closest official weather station to Glasgow, not within the city itself. The Met Office's Aberfoyle station, located in the Perthshire region at an elevation of 28 metres, sits about 35.6 kilometres from Glasgow city centre. That's a meaningful distance — Glasgow's urban core, with its buildings, river Clyde and local topography, can experience different temperatures than a rural site like Aberfoyle. The data I present here is the best available reference for the Glasgow area, but it's not a measurement taken inside the city. For full accuracy, treat these as readings from the surrounding region rather than Glasgow proper.
This is the big one — the hottest week on record for the Glasgow reference station:
26.4°C
average daily maximum temperature, 15–21 July 1972
That week stands alone at the top of the charts in the entire Met Office record from 1968 to 2001. No other seven-day stretch in that period came close to matching its sustained heat.
To appreciate what 26.4°C as a weekly average means, consider that it was not a brief spike — it was the sustained mean of daily highs across seven full days. For the Aberfoyle station, where the typical July maximum hovers around 28.0°C at the most extreme single day ever recorded, maintaining an average above 26°C for a full week requires relentlessly warm conditions day after day. The summer of 1972 delivered exactly that, and it remains unmatched more than half a century later.
The record is especially striking when you compare it to the station's usual seasonal rhythm. In an average year, July temperatures at Aberfoyle sit around 14.0°C as the monthly mean (tmed), with extreme individual days reaching 28.0°C at the top of the monthly scale. The July 1972 week averaged nearly double the normal monthly mean on the high side — a reminder that the Scottish climate can produce genuine heatwaves when atmospheric patterns align.
This analysis uses daily maximum temperature readings from the Met Office's official MIDAS archive, compiled at CEDA (Centre for Environmental Data Analysis). The method is straightforward: for each day in the record, we take the highest temperature observed at the Aberfoyle station (coded in the UK network). Then we calculate a rolling 7-day average — that is, for every date, we average the daily maxima of that date and the six preceding days. The week of 15–21 July 1972 produced the highest such rolling average in the entire dataset.
It's worth noting that this is a "mobile" week: the average ending on 21 July 1972 covers the 15th through the 21st. Any seven-day stretch ending on a date within that window might overlap partially, but this particular ending date gave the highest value. The record thus represents the single most sustained hot spell in the station's recorded history.
To understand how exceptional that July 1972 week was, here's the full picture of extreme temperatures and typical monthly means at Aberfoyle across the year. This table shows, for each month, the highest daily maximum ever observed (tmax) and the average daily mean temperature (tmed) across the period of record:
| Month | Highest daily max (°C) | Average daily mean (°C) |
|---|---|---|
| January | 12.8 | 3.4 |
| February | 13.3 | 2.9 |
| March | 18.0 | 4.3 |
| April | 19.5 | 6.6 |
| May | 24.8 | 9.7 |
| June | 29.7 | 12.3 |
| July | 28.0 | 14.0 |
| August | 28.2 | 14.4 |
| September | 24.0 | 11.8 |
| October | 22.0 | 9.2 |
| November | 16.2 | 5.2 |
| December | 14.0 | 4.2 |
Notice that the single hottest day on record at Aberfoyle occurred in June, reaching 29.7°C, while July's extreme was slightly lower at 28.0°C. Yet the hottest week happened in July 1972, not June. The explanation lies in consistency: June might deliver one scorching afternoon, but July 1972 delivered a string of warm days with no cool interruptions — exactly what pushes a 7-day average to the top.
Since that July 1972 week, the Aberfoyle station has continued to record temperatures, but nothing has surpassed it. The record has now held for over half a century. To put it in perspective with the most recent extremes: the station's highest individual daily maximum in any recent decade appears only in the monthly peaks — the 29.7°C June spike and 28.2°C August peak are the warmest single days on file. Neither, however, was part of a week quite as relentlessly warm as that July 1972 spell.
For residents of the Glasgow area planning outdoor events, this information is more than a curious footnote — it's a practical reference. If you're choosing dates for a summer gathering or a sports tournament and want the best odds of warm, settled weather, knowing that the all-time hottest week landed in mid-to-late July tells you something about the seasonal window when the region can produce its most intense heat. But it also warns you that such heat is rare: the record was set once in 34 years of observations, and it hasn't been threatened since.
Because the Aberfoyle station sits outside the city, you should hesitate before assuming Glasgow itself hit these exact figures. Urban heat island effects could push city-centre temperatures higher on clear nights, while the rural station might read cooler in some conditions. Likewise, local breezes off the Clyde or the shelter of surrounding hills could shift readings by a degree or two. The 26.4°C weekly average is the closest official measurement we have for the Glasgow area, but treat it as a regional benchmark rather than a precise urban forecast.
What the record does give you is a definitive answer to a common question: how hot can it really get around here? The Met Office's answer, from the Aberfoyle station, is 26.4°C as a seven-day average in July 1972 — a figure that withstood every heatwave, every warm summer and every climate fluctuation recorded in the subsequent three decades of data. And it remains the benchmark to beat whenever a hot spell builds over Scotland.
Source: Met Office MIDAS records, Aberfoyle station, 1968–2001.
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