Updated: 2026-08-12
The warmest month of the year in the Glasgow area is July, when the average daily maximum temperature reaches 19.3°C — the highest monthly average maximum recorded at the nearest official weather station, Paisley. That same month, the average minimum temperature stays at a comfortable 11.6°C, making it the most pleasant window for outdoor plans. If you prefer drier conditions, April offers the lowest average rainfall at just 2.1 mm per day, even though average highs are still a modest 12.0°C.
The closest measuring point to Glasgow is the Met Office station at Paisley, located in Renfrewshire at an elevation of 32 metres, roughly 11.4 km from the city centre. This station has a remarkable data record spanning from 1914-01-01 to 2026-08-11. The figures below are what this station records; Glasgow's actual weather can differ slightly due to local factors such as altitude, proximity to the Clyde, or the urban heat island effect, but Paisley offers the most reliable long-term reference for the region.
For more than a century of observations, the pattern is clear: the best time to visit Glasgow for the most temperate weather is late spring through early autumn, with the peak in July and August. If your priority is sunshine and warmth, aim for July; if you want to dodge the wettest days, April is your month, with only 2.1 mm of average daily rain.
The Paisley station's records, held by the Met Office in the MIDAS archive, show how consistent the seasons are, though within this long period there has been plenty of variation. The monthly averages below are computed from daily observations covering the full span from 1914 to 2026, which gives you a robust picture of what to pack and when to plan.
| Month | Average Max (°C) | Average Min (°C) | Average Precipitation (mm) |
|---|---|---|---|
| January | 6.3 | 1.5 | 4.2 |
| February | 6.9 | 1.6 | 3.2 |
| March | 9.0 | 2.7 | 2.8 |
| April | 12.0 | 4.4 | 2.1 |
| May | 15.4 | 7.0 | 2.2 |
| June | 18.1 | 9.7 | 2.1 |
| July | 19.3 | 11.6 | 2.5 |
| August | 18.9 | 11.4 | 2.9 |
| September | 16.3 | 9.4 | 3.4 |
| October | 12.7 | 6.8 | 4.1 |
| November | 8.9 | 3.7 | 3.9 |
| December | 6.8 | 2.1 | 4.1 |
The winter months, from December through February, are cold and damp. January averages a daily maximum of only 6.3°C and a minimum of 1.5°C, with the highest average daily rainfall of the year at 4.2 mm. February is nearly identical, with an average high of 6.9°C. If you are planning a city break in deep winter, you should expect short days, grey skies, and frequent showers — though the city's festive lights and indoor attractions offer their own charm.
Spring brings a gradual but noticeable shift. March still feels crisp with an average high of 9.0°C, but by May the average maximum climbs to 15.4°C and rainfall remains modest at 2.2 mm. The real sweet spot, if you want both mild temperatures and relatively dry days, is April: the average precipitation drops to 2.1 mm, the same as June, while the temperatures are spring-like rather than cold.
Summer is when Glasgow (as reflected by the Paisley readings) is at its most inviting. July tops the scale with an average maximum of 19.3°C and an average minimum of 11.6°C. August follows closely with an average high of 18.9°C. These are not scorching temperatures, but they are comfortable for walking, sightseeing, and enjoying the city's parks and riverbanks. June, meanwhile, offers the same low rainfall as April at 2.1 mm with warmer days averaging 18.1°C.
Autumn sees a steady cooling. September still holds an average high of 16.3°C with moderate rain at 3.4 mm, making it a viable shoulder-season option. By October, average highs drop to 12.7°C and rainfall rises to 4.1 mm. November brings the average maximum down to 8.9°C and precipitation to 3.9 mm, signalling the return of the wet, grey winter pattern.
Based on the complete Met Office record from 1914 to 2026, the answer depends on your tolerance for drizzle versus your desire for warmth. If you want the warmest possible conditions, book your trip for July, when historical averages peak at 19.3°C. If you prefer to minimise rain, April and June are your best bets, both averaging just 2.1 mm of daily precipitation — the lowest of the year. For a balance of both, late spring (May) through early autumn (September) offers the most reliable window: every month from May to September has an average maximum above 15.4°C and moderate rainfall.
One practical note: even in the high season, Glasgow's weather can change within a single hour. The averages hide extremes like a cold snap in May or a warm October. But for planning purposes, the data says what it says: July is the warmest month at 19.3°C, and April and June share the driest days at 2.1 mm. That is the most data-driven answer available for this corner of the UK, straight from the official national meteorological records.
Source: Met Office (MIDAS archive), Paisley station, 1914–2026.
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© 2026 HistoClima · data: Met Office (OGL v3.0) · not affiliated with Met Office · citation permitted with source.