Climate averages 1991–2020
Glasgow weather
in September.
A mild, moderately wet month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Glasgow: daytime highs average 15.1°C and nights cool to about 9.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 83 mm of rain on roughly 13 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 49 min on an average September day.
The nearest other city in this atlas is Paisley (12 km away). In September its highs average 15.1°C, about as warm as Glasgow, with 90 mm of rain.
Among the 143 cities listed in the United Kingdom, Glasgow ranks joint 139th of 143 for the warmest September highs and joint 133rd of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Glasgow is 2.2°C cooler than that mean.
From September to October, average highs fall by 3.4°C to 11.7°C, and monthly rainfall rises from 83 mm to 110 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Glasgow climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.8°C1.4°C | 1.4°C | 116 | 16.7 | 7.78 h |
| February | 6.4°C1.3°C | 1.3°C | 98 | 14.5 | 9.510 h |
| March | 8.1°C2.1°C | 2.1°C | 87 | 14.5 | 11.812 h |
| April | 10.7°C3.6°C | 3.6°C | 74 | 13.8 | 14.114 h |
| May | 13.7°C6.3°C | 6.3°C | 79 | 13.6 | 16.316 h |
| June | 16.0°C9.4°C | 9.4°C | 86 | 14.2 | 17.517 h |
| July | 17.5°C11.1°C | 11.1°C | 92 | 15.5 | 16.917 h |
| August | 17.2°C10.9°C | 10.9°C | 101 | 15.7 | 15.115 h |
| September, selected | 15.1°C9.2°C | 9.2°C | 83 | 13.3 | 12.813 h |
| October | 11.7°C6.4°C | 6.4°C | 110 | 15.5 | 10.510 h |
| November | 8.3°C3.6°C | 3.6°C | 105 | 15.9 | 8.38 h |
| December | 5.9°C1.4°C | 1.4°C | 115 | 15.8 | 7.17 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Paisley in SeptemberUnited Kingdom · 12 kmHigh 15.1°C · Low 9.4°C · 90 mm rain
- East Kilbride in SeptemberUnited Kingdom · 12 kmHigh 14.4°C · Low 8.4°C · 83 mm rain
- Edinburgh in SeptemberUnited Kingdom · 67 kmHigh 15.2°C · Low 9.7°C · 59 mm rain
- Dundee, United Kingdom in SeptemberUnited Kingdom · 104 kmHigh 15.1°C · Low 9.1°C · 61 mm rain
- Carlisle in SeptemberUnited Kingdom · 136 kmHigh 15.5°C · Low 9.3°C · 70 mm rain
- Belfast in SeptemberUnited Kingdom · 176 kmHigh 15.7°C · Low 11.3°C · 70 mm rain
- Lisburn in SeptemberUnited Kingdom · 187 kmHigh 15.6°C · Low 10.6°C · 70 mm rain
- Douglas in SeptemberIsle of Man · 191 kmHigh 15.1°C · Low 13.1°C · 85 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Glasgow) is explained once on the Glasgow year overview and on the Sources, method and limits page.
East Kilbride lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.