Updated: 2026-08-14
If you are picturing a typical summer day in the Glasgow area, think of a high near 18.8°C — the long-term average maximum for June, July and August.
The closest long-term Met Office measuring point to Glasgow is the Paisley station, in Renfrewshire, sitting at an elevation of 32 metres and roughly 11.4 km from the city centre. Its records, which stretch from 1914 through to August 2026, give the most reliable picture we have of what summer heat — or the lack of it — has looked like across more than a century of observation. These are the numbers that station has logged, not a forecast, and not a reading taken directly in Glasgow.
Across the full summer season, the average daily maximum at Paisley has settled at 18.8°C, while nights cool down to an average minimum of 10.9°C. The overall mean temperature for the season, combining daytime highs and overnight lows, comes out at 14.9°C. For anyone used to hotter European summers, that spread — warm afternoons followed by distinctly cool nights — is the signature of a west-of-Scotland summer.
Because the station sits at a different elevation and in a slightly different position relative to local hills and the River Clyde than Glasgow itself, the real temperature in the city can drift a little from what Paisley records. A sheltered street in the city centre might hold heat differently from an exposed field in Renfrewshire. The data below is the best reference we have, but it describes the measuring point, not a precise reading for every postcode in Glasgow.
Summer does not arrive suddenly in this part of Scotland. The monthly averages from the Met Office station show a slow climb through spring, a peak in July, and a gradual retreat into autumn. The tables below lay out the typical maximum and mean temperatures for each month, based on the full period of record.
| Month | Average Maximum | Average Mean |
|---|---|---|
| January | 6.3 | 3.9 |
| February | 6.9 | 4.3 |
| March | 9.0 | 5.9 |
| April | 12.0 | 8.2 |
| May | 15.4 | 11.2 |
| June | 18.1 | 13.9 |
| July | 19.3 | 15.5 |
| August | 18.9 | 15.2 |
| September | 16.3 | 12.9 |
| October | 12.7 | 9.7 |
| November | 8.9 | 6.3 |
| December | 6.8 | 4.5 |
July stands as the warmest month of the year on average, with a typical high of 19.3°C and a mean temperature of 15.5°C. June and August follow closely, with average maximums of 18.1°C and 18.9°C respectively. The gap between the hottest and coldest months — December's mean of 4.5°C compared with July's 15.5°C — is modest by continental standards, a reminder of how strongly the Atlantic shapes the climate here.
The full series at Paisley runs from the very start of 1914 through to 13 August 2026. That is more than a hundred summers of daily readings, all logged by the Met Office's national weather station network and stored in the MIDAS archive. What emerges is a remarkably consistent picture: no month in the record has an average maximum above the low twenties, and even the warmest summer days rarely push far beyond that.
When you strip away the extremes — the occasional heatwave, the cool, damp spells — a normal summer day near Glasgow is a modestly warm afternoon. The 18.8°C average maximum for the season means that many days will feel pleasant without ever becoming hot. It is the kind of warmth that suits a walk along the Clyde or a picnic in the park, but one that can evaporate quickly when the cloud rolls in from the west.
The night-time figure of 10.9°C is just as important. Summer evenings here do not hold their heat. Once the sun drops, temperatures fall away sharply, and a light jacket becomes useful even after a warm afternoon. For anyone planning outdoor events, that overnight coolness is a constant consideration.
It is worth repeating that this data describes Paisley, not Glasgow directly. The station sits at 32 metres above sea level, while the city centre lies a few kilometres away with its own microclimates. Dense urban areas can run warmer at night than surrounding countryside, and the exact position of a hill or a stretch of open water can shift temperatures by a degree or two. The figures here are the most complete and reliable reference available for the area, and they come from a station that has been recording consistently for over a century. But for a measurement taken precisely at your own front door in Glasgow, you would need a personal station — and it would almost certainly show small differences from these long-term averages.
The Met Office data covers a period of more than a hundred years, and across that stretch, the average summer maximum of 18.8°C has become the benchmark against which individual summers are judged. Some years push above it, some fall below, but the long-term average remains the most useful single number for answering that simple question: what does a normal summer day feel like here? The answer, according to over a century of records, is a high of 18.8°C, a low of 10.9°C, and a mean of 14.9°C — cool nights, mild days, and a summer that is gentle rather than extreme.
Source: Met Office — Paisley station, 1914–2026. Data from the MIDAS archive, held at CEDA, under the Open Government Licence (OGL v3.0).
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© 2026 HistoClima · data: Met Office (OGL v3.0) · not affiliated with Met Office · citation permitted with source.