Updated: 2026-08-14
12669.3 mmTotal January rainfall recorded at Paisley station since 1914
If you are planning a trip to Glasgow and want to avoid the heaviest rain, the answer is clear: January stands out as the wettest month in the historical record. The closest measuring point to Glasgow, the Met Office station at Paisley, has accumulated that total in January alone since records began on 1914-01-01. October follows closely with 12222.5 mm, and December is right behind at 12211.1 mm.
The point of measurement closest to Glasgow is the Met Office station at Paisley, located in Renfrewshire at an altitude of 32 m, approximately 11.4 km from the city centre. These are its historical records, and they serve as the best available reference for understanding what to expect when travelling to Glasgow. Keep in mind that the actual weather in Glasgow can differ from the station readings due to local factors such as elevation changes, proximity to the River Clyde, or sheltered urban valleys. The data you see here reflects what is measured at Paisley, not a direct measurement of Glasgow itself.
The Met Office has been collecting daily precipitation data at Paisley since 1914-01-01, creating a continuous record that extends to 2026-08-13. That is more than a century of rainfall observations, giving us a very solid picture of the seasonal rhythm. The three wettest months in this long series are all clustered in the dark, cold half of the year: January leads with a mean precipitation of 4.2 mm per day, followed by October and December, each with a daily mean of 4.1 mm.
The table below ranks the top three rainiest months based on the average daily precipitation recorded at Paisley station. These are the months you would most likely want to avoid if dry weather is a priority for your travel plans.
| Month | Mean daily precipitation (mm) |
|---|---|
| January | 4.2 |
| October | 4.1 |
| December | 4.1 |
While the daily averages highlight January as the wettest month, looking at the total accumulated rainfall for each month of the year reveals the complete seasonal pattern. The figures below are the sum of all precipitation recorded in each month across the entire period from 1914 through mid-2026. They show exactly how the rain is distributed throughout the year at this measuring point.
| Month | Total precipitation (mm) |
|---|---|
| January | 12669.3 |
| February | 8944.3 |
| March | 8382.0 |
| April | 6186.7 |
| May | 6759.9 |
| June | 6211.4 |
| July | 7426.8 |
| August | 8685.9 |
| September | 10028.5 |
| October | 12222.5 |
| November | 11489.0 |
| December | 12211.1 |
The seasonal contrast is striking. Spring and early summer are the driest periods: April accumulates 6186.7 mm, June 6211.4 mm, and May 6759.9 mm. These months receive roughly half the rainfall of January. From September onward, the totals climb steadily: September reaches 10028.5 mm, November 11489.0 mm, and then December and January both exceed 12200 mm. October, with 12222.5 mm, is nearly identical in total precipitation to December, which makes the late autumn and early winter period the rainiest stretch of the year.
If your goal is to maximise the chances of dry days, the data points clearly to the months of April, June, and May as your best bet. These three months show the lowest accumulated rainfall in the entire record at Paisley station. April, with its 6186.7 mm total, is the driest month overall, followed closely by June at 6211.4 mm and May at 6759.9 mm.
On the other hand, if you are considering a visit between October and January, you should expect wet conditions as the norm. January alone holds 12669.3 mm of accumulated rainfall, the highest of any month in the series. Travellers who do venture to Glasgow in the winter months should pack waterproof clothing and plan indoor activities. The rainfall in this region is persistent rather than dramatic: it is the steady, day-after-day drizzle that accumulates to those large totals, not isolated storms.
It is worth noting that the Paisley station sits at 32 m above sea level in Renfrewshire. This location, on the western edge of the Central Lowlands, is typical of the broader Glasgow area. The proximity to the Atlantic and the prevailing south-westerly winds bring moist air that produces frequent rain throughout the year, but the winter months see the most active weather systems. The difference between the wettest and driest months is substantial, and planning around it can make a real difference to your trip.
The historical series at Paisley is one of the longer continuous weather records in Scotland. Since its start on 1914-01-01, it has captured not only the average patterns but also the variability year to year. While climate change may be shifting some patterns in recent decades, the fundamental seasonal rhythm remains consistent: winter and late autumn are wet, late spring and early summer are drier.
For anyone deciding between a summer or winter trip, the numbers speak for themselves. A July visit, with 7426.8 mm of accumulated rainfall, offers a far drier experience than a January one. Spring months like April and May, with totals around 6200–6800 mm, are even better for those seeking the fewest rainy days. If you must travel in the wet season, October and December are nearly indistinguishable in rainfall, so choose based on other factors like daylight hours or festive events.
In summary, the rainiest months to avoid when travelling to the Glasgow area are January, October, and December, based on the long-term Met Office measurements at the nearby Paisley station. The driest months are April, June, and May. Plan accordingly, and the Scottish weather will be far less of a surprise.
Source: Met Office, Paisley station. Data period: 1914–2026.
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© 2026 HistoClima · data: Met Office (OGL v3.0) · not affiliated with Met Office · citation permitted with source.