Few UK towns get more days of 25 degrees or more than Byfleet
A clear January night here typically dips to 2.3°C (36°F). November is the wettest month, March the driest. By January nights alone, it runs milder than 80% of UK towns. Windscreens need scraping on about 39 mornings a year, the nights the air drops below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Byfleet at a glance
Each month’s typical high and low, in °C.
What a year in Byfleet feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 675 mm of rain a year
November is the wettest month and March the driest. About 16 days a year bring 10 mm (0.4 in) or more. 48th wettest of 66 Surrey 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 9.2 miles north of Byfleet, 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 Byfleet 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 Surrey 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 |
|---|---|---|---|
| Byfleet | 23.1°C | 2.3°C | 675 mm |
| Weybridge 1.9 mi | 23.0°C about the same | 2.3°C about the same | 679 mm |
| New Haw, West Byfleet and Sheerwater 1.9 mi | 23.2°C about the same | 2.3°C about the same | 665 mm |
| Addlestone 2.0 mi | 23.1°C about the same | 2.4°C about the same | 666 mm |
| Hersham 3.0 mi | 23.0°C about the same | 2.4°C about the same | 676 mm |
| Chertsey 3.3 mi | 23.1°C about the same | 2.4°C about the same | 665 mm |
| Shepperton 3.5 mi | 23.5°C about the same | 2.5°C about the same | 639 mm |
Byfleet 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 | 8.2°C 47°F | 2.3°C 36°F | 5.3°C | 65 mm 2.5 in |
| February | 8.7°C 48°F | 2.1°C 36°F | 5.5°C | 49 mm 1.9 in |
| March | 11.4°C 53°F | 3.5°C 38°F | 7.5°C | 42 mm 1.7 in |
| April | 14.6°C 58°F | 5.0°C 41°F | 9.8°C | 46 mm 1.8 in |
| May | 17.8°C 64°F | 7.9°C 46°F | 12.9°C | 46 mm 1.8 in |
| June | 20.8°C 69°F | 10.8°C 51°F | 15.8°C | 49 mm 1.9 in |
| July | 23.1°C 74°F | 12.9°C 55°F | 18.0°C | 49 mm 1.9 in |
| August | 22.6°C 73°F | 12.7°C 55°F | 17.7°C | 60 mm 2.4 in |
| September | 19.6°C 67°F | 10.3°C 51°F | 15.0°C | 55 mm 2.2 in |
| October | 15.4°C 60°F | 7.7°C 46°F | 11.6°C | 74 mm 2.9 in |
| November | 11.2°C 52°F | 4.7°C 40°F | 8.0°C | 75 mm 2.9 in |
| December | 8.5°C 47°F | 2.5°C 37°F | 5.6°C | 67 mm 2.6 in |
| Year | 15.2°C | 6.9°C | 11.0°C | 675 mm |
Where Byfleet’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 4 Met Office 2 km grid squares whose centre lies inside Byfleet’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), 9.2 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 Byfleet’s climate
How warm does Byfleet get in summer?
July is the warmest month, with average highs of 23.1°C (74°F). About 23 days a year reach 25°C (77°F), more than 97% of UK towns.
How cold does Byfleet get in winter?
February 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 Byfleet get?
About 675 mm (27 in) a year, less than 73% of UK towns. November is the wettest month (75 mm) and March the driest (42 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Heathrow (9.2 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 Byfleet. 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 Byfleet →
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