Glasgow records about 1124mm of rain across roughly 170 wet days a year, which is a 47% chance on an average day. October is the wettest month at 113mm (10% of the annual total) and April the driest at 62mm. Local rain type: steady rain. Glasgow is one of Europe's wettest cities — high-quality waterproofs are essential, not optional. Horizontal rain is common.
Chance of rain on an average day: 47%
Rainfall climatology for Glasgow. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1124mm |
| Rain days per year | 170 |
| Odds on an average day | 47% |
| Wettest month | October — 113mm over 18 days |
| Driest month | April — 62mm over 10 days |
| Rain type | steady rain |
| Best dry window | May and June offer the driest months with pleasantly long Scottish summer days. |
| Worst rain window | January and December bring the heaviest rain combined with very short daylight hours. |
October delivers 82% more rain than April (113mm vs 62mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 10% of the annual total, so rain in Glasgow is spread through the year — there is no season you can rely on being dry.
Glasgow rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 18 days in October against 10 in April — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 112mm | 18 | 60% | 6°C |
| February | 77mm | 13 | 43% | 6°C |
| March | 83mm | 14 | 47% | 8°C |
| April | 62mm | 10 | 33% | 11°C |
| May | 64mm | 10 | 33% | 14°C |
| June | 67mm | 11 | 37% | 17°C |
| July | 73mm | 12 | 40% | 19°C |
| August | 96mm | 16 | 53% | 19°C |
| September | 93mm | 15 | 50% | 17°C |
| October | 113mm | 18 | 60% | 14°C |
| November | 100mm | 16 | 53% | 11°C |
| December | 102mm | 17 | 57% | 8°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Glasgow we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Glasgow records rain on roughly 170 days a year — about a 47% chance on any given day — totalling around 1124mm.
October, with about 113mm over 18 rain days. That is 10% of the entire year's rainfall in a single month.
April is the driest month at 62mm across roughly 10 days. May and June offer the driest months with pleasantly long Scottish summer days.
Glasgow is one of Europe's wettest cities — high-quality waterproofs are essential, not optional. Horizontal rain is common.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.