Hardly any UK towns see hotter July days than Slough
Winter’s chill peaks in January, at about 2.1°C (36°F) after dark. Rain peaks in November and eases off in March. By rainfall alone, it ranks drier than 83% of UK towns. Frost greets about 39 mornings a year, so leave time to clear the car.
Met Office 1991–2020 averages for the town itself.
A year in Slough at a glance
Each month’s typical high and low, in °C.
What a year in Slough feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 641 mm of rain a year
November is the wettest month and March the driest. About 15 days a year bring 10 mm (0.4 in) or more. 29th wettest of 30 Berkshire towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Heathrow
39 air frosts and 23 days of 25°C a year
On about 39 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 23 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Heathrow
Heathrow is 7.0 miles east of Slough, 25 m (82 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.4°C | 2.7°C | 59 mm | 6.8 | 59 |
| February | 9.0°C | 2.6°C | 45 mm | 6.2 | 76 |
| March | 11.7°C | 4.1°C | 39 mm | 3.0 | 120 |
| April | 15.0°C | 6.0°C | 42 mm | 0.8 | 169 |
| May | 18.4°C | 9.1°C | 46 mm | 0.0 | 197 |
| June | 21.6°C | 12.0°C | 47 mm | 0.0 | 197 |
| July | 23.9°C | 14.2°C | 46 mm | 0.0 | 206 |
| August | 23.4°C | 14.1°C | 54 mm | 0.0 | 192 |
| September | 20.2°C | 11.6°C | 50 mm | 0.0 | 150 |
| October | 15.8°C | 8.8°C | 65 mm | 0.3 | 111 |
| November | 11.5°C | 5.3°C | 67 mm | 2.7 | 68 |
| December | 8.8°C | 3.1°C | 57 mm | 7.2 | 53 |
| Year | 15.6°C | 7.8°C | 616 mm | 27 | 1,597 |
Met Office historic station data, Heathrow (London Airport), 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Slough compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Berkshire towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Slough | 23.3°C | 2.1°C | 641 mm |
| Eton 1.6 mi | 23.3°C about the same | 2.2°C about the same | 633 mm |
| Eton Wick 1.9 mi | 23.3°C about the same | 2.2°C about the same | 634 mm |
| Datchet 2.5 mi | 23.2°C about the same | 2.2°C about the same | 618 mm |
| Stoke Poges 2.5 mi | 22.7°C 0.6°C cooler | 1.9°C about the same | 703 mm |
| Farnham Common and Farnham Royal 2.8 mi | 22.7°C 0.6°C cooler | 1.9°C about the same | 702 mm |
| Windsor 2.9 mi | 22.6°C 0.7°C cooler | 2.1°C about the same | 675 mm |
Slough weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 8.1°C 47°F | 2.1°C 36°F | 5.1°C | 62 mm 2.5 in |
| February | 8.8°C 48°F | 2.2°C 36°F | 5.5°C | 47 mm 1.8 in |
| March | 11.5°C 53°F | 3.5°C 38°F | 7.5°C | 41 mm 1.6 in |
| April | 14.7°C 58°F | 5.1°C 41°F | 9.9°C | 46 mm 1.8 in |
| May | 18.0°C 64°F | 8.0°C 46°F | 13.0°C | 45 mm 1.8 in |
| June | 20.9°C 70°F | 10.9°C 52°F | 15.9°C | 46 mm 1.8 in |
| July | 23.3°C 74°F | 13.0°C 55°F | 18.1°C | 45 mm 1.8 in |
| August | 22.9°C 73°F | 12.9°C 55°F | 17.8°C | 56 mm 2.2 in |
| September | 19.8°C 68°F | 10.5°C 51°F | 15.1°C | 51 mm 2.0 in |
| October | 15.5°C 60°F | 7.9°C 46°F | 11.7°C | 70 mm 2.7 in |
| November | 11.2°C 52°F | 4.7°C 40°F | 7.9°C | 71 mm 2.8 in |
| December | 8.5°C 47°F | 2.5°C 37°F | 5.5°C | 62 mm 2.4 in |
| Year | 15.2°C | 6.9°C | 11.1°C | 641 mm |
Where Slough’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 9 Met Office 2 km grid squares whose centre lies inside Slough’s built-up area.
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Heathrow (London Airport), 7.0 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Slough’s climate
How warm does Slough get in summer?
July is the warmest month, with average highs of 23.3°C (74°F). About 23 days a year reach 25°C (77°F), more than 97% of UK towns.
How cold does Slough get in winter?
January nights average 2.1°C (36°F). The air drops below freezing on about 39 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Slough get?
About 641 mm (25 in) a year, less than 83% of UK towns. November is the wettest month (71 mm) and March the driest (41 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Heathrow (7.0 miles away), averages 1,597 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Slough. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Slough →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.