Bourn is among the driest of UK towns: 581 mm (23 in) of rain a year
On a normal July day the thermometer tops out near 22.8°C (73°F). The rainiest month is August; the driest is March. By warm days alone, it ranks hotter than 93% of UK towns. Long walks are most pleasant from June to September, when afternoons reach 19–23°C.
Met Office 1991–2020 averages for the town itself.
A year in Bourn at a glance
Each month’s typical high and low, in °C.
What a year in Bourn feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 581 mm of rain a year
August is the wettest month and March the driest. About 13 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
46 air frosts and 21 days of 25°C a year
On about 46 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 21 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 Cambridge NIAB
Cambridge NIAB is 8.0 miles north-east of Bourn, 26 m (85 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 |
|---|---|---|---|---|
| January | 7.7°C | 1.9°C | 49 mm | 9.0 |
| February | 8.3°C | 1.8°C | 36 mm | 8.7 |
| March | 11.0°C | 3.1°C | 33 mm | 5.2 |
| April | 14.1°C | 4.7°C | 38 mm | 2.6 |
| May | 17.4°C | 7.4°C | 43 mm | 0.6 |
| June | 20.4°C | 10.5°C | 49 mm | 0.0 |
| July | 23.1°C | 12.6°C | 48 mm | 0.0 |
| August | 22.9°C | 12.6°C | 56 mm | 0.0 |
| September | 19.6°C | 10.5°C | 51 mm | 0.0 |
| October | 15.1°C | 7.9°C | 59 mm | 0.7 |
| November | 10.7°C | 4.5°C | 53 mm | 3.7 |
| December | 8.0°C | 2.2°C | 50 mm | 9.2 |
| Year | 14.9°C | 6.6°C | 563 mm | 40 |
Met Office historic station data, Cambridge NIAB, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Bourn 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 Cambridgeshire 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 |
|---|---|---|---|
| Bourn | 22.8°C | 1.5°C | 581 mm |
| Cambourne 1.6 mi | 22.8°C about the same | 1.5°C about the same | 582 mm |
| Highfields Caldecote 2.1 mi | 22.9°C about the same | 1.4°C about the same | 588 mm |
| Hardwick 3.3 mi | 23.0°C about the same | 1.5°C about the same | 576 mm |
| Comberton 3.8 mi | 23.0°C about the same | 1.6°C about the same | 577 mm |
| Papworth Everard 4.5 mi | 22.8°C about the same | 1.5°C about the same | 600 mm |
| Orwell 4.7 mi | 23.0°C about the same | 1.6°C about the same | 555 mm |
Bourn 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 | 7.4°C 45°F | 1.5°C 35°F | 4.5°C | 50 mm 2.0 in |
| February | 8.1°C 47°F | 1.4°C 35°F | 4.8°C | 37 mm 1.4 in |
| March | 10.9°C 52°F | 2.7°C 37°F | 6.8°C | 34 mm 1.3 in |
| April | 14.0°C 57°F | 4.2°C 40°F | 9.1°C | 39 mm 1.5 in |
| May | 17.2°C 63°F | 7.0°C 45°F | 12.1°C | 44 mm 1.7 in |
| June | 20.2°C 68°F | 10.0°C 50°F | 15.1°C | 49 mm 1.9 in |
| July | 22.8°C 73°F | 12.1°C 54°F | 17.5°C | 51 mm 2.0 in |
| August | 22.7°C 73°F | 12.2°C 54°F | 17.4°C | 60 mm 2.4 in |
| September | 19.4°C 67°F | 10.2°C 50°F | 14.8°C | 53 mm 2.1 in |
| October | 15.0°C 59°F | 7.6°C 46°F | 11.3°C | 60 mm 2.3 in |
| November | 10.5°C 51°F | 4.2°C 40°F | 7.3°C | 54 mm 2.1 in |
| December | 7.7°C 46°F | 1.8°C 35°F | 4.8°C | 51 mm 2.0 in |
| Year | 14.7°C | 6.3°C | 10.4°C | 581 mm |
Where Bourn’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest Bourn’s centre (the town is smaller than one square).
- 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 Cambridge NIAB, 8.0 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 Bourn’s climate
How warm does Bourn get in summer?
July is the warmest month, with average highs of 22.8°C (73°F). About 21 days a year reach 25°C (77°F), more than 93% of UK towns.
How cold does Bourn get in winter?
February nights average 1.4°C (35°F). The air drops below freezing on about 46 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Bourn get?
About 581 mm (23 in) a year, less than 96% of UK towns. August is the wettest month (60 mm) and March the driest (34 mm).
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 Bourn. 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 Bourn →
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