Horndean is wetter than 76% of UK towns: 979 mm (39 in) of rain a year
The warmest part of a July day comes in at 22.1°C (72°F) on average. Wet weather is most frequent in November and least in May. By warm days alone, it ranks hotter than 67% of UK towns. Expect about 43 frosty starts a year, nights when the air falls below freezing.
Met Office 1991–2020 averages for the town itself.
A year in Horndean at a glance
Each month’s typical high and low, in °C.
What a year in Horndean feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 979 mm of rain a year
November is the wettest month and May the driest. About 32 days a year bring 10 mm (0.4 in) or more. 3rd wettest of 77 Hampshire towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Hurn (Bournemouth Airport)
43 air frosts and 14 days of 25°C a year
On about 43 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 14 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 Hurn (Bournemouth Airport)
Hurn (Bournemouth Airport) is 37 miles west of Horndean, 10 m (33 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full; at that distance read it for sunshine and the station’s own record, not as the town’s figures.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.8°C | 1.8°C | 96 mm | 11.1 | 65 |
| February | 9.1°C | 1.6°C | 67 mm | 10.9 | 80 |
| March | 11.4°C | 2.8°C | 62 mm | 8.3 | 122 |
| April | 14.2°C | 4.3°C | 58 mm | 4.7 | 178 |
| May | 17.4°C | 7.3°C | 49 mm | 0.6 | 211 |
| June | 20.1°C | 10.2°C | 54 mm | 0.0 | 217 |
| July | 22.3°C | 12.2°C | 50 mm | 0.0 | 221 |
| August | 22.0°C | 12.0°C | 60 mm | 0.0 | 198 |
| September | 19.6°C | 9.6°C | 69 mm | 0.0 | 156 |
| October | 15.6°C | 7.4°C | 101 mm | 2.2 | 108 |
| November | 11.8°C | 4.1°C | 108 mm | 6.9 | 76 |
| December | 9.2°C | 2.0°C | 104 mm | 11.6 | 59 |
| Year | 15.1°C | 6.3°C | 877 mm | 56 | 1,690 |
Met Office historic station data, Hurn, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Horndean 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 Hampshire 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 |
|---|---|---|---|
| Horndean | 22.1°C | 1.9°C | 979 mm |
| Clanfield 2.3 mi | 21.6°C about the same | 1.7°C about the same | 1,055 mm |
| Denmead 2.3 mi | 22.3°C about the same | 2.1°C about the same | 887 mm |
| Waterlooville 2.5 mi | 22.7°C 0.6°C warmer | 2.3°C about the same | 853 mm |
| Rowlands Castle 2.7 mi | 22.7°C 0.6°C warmer | 2.2°C about the same | 879 mm |
| Havant 3.4 mi | 23.0°C 1.0°C warmer | 2.5°C 0.6°C milder | 766 mm |
| Westbourne 5.0 mi | 22.7°C 0.6°C warmer | 2.2°C about the same | 880 mm |
Horndean 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 | 1.9°C 35°F | 5.0°C | 107 mm 4.2 in |
| February | 8.5°C 47°F | 1.8°C 35°F | 5.2°C | 74 mm 2.9 in |
| March | 11.0°C 52°F | 3.3°C 38°F | 7.1°C | 63 mm 2.5 in |
| April | 13.9°C 57°F | 4.7°C 40°F | 9.3°C | 64 mm 2.5 in |
| May | 17.2°C 63°F | 7.6°C 46°F | 12.4°C | 53 mm 2.1 in |
| June | 20.0°C 68°F | 10.3°C 50°F | 15.1°C | 66 mm 2.6 in |
| July | 22.1°C 72°F | 12.3°C 54°F | 17.2°C | 61 mm 2.4 in |
| August | 22.1°C 72°F | 12.4°C 54°F | 17.2°C | 76 mm 3.0 in |
| September | 19.4°C 67°F | 10.2°C 50°F | 14.8°C | 75 mm 3.0 in |
| October | 15.3°C 60°F | 7.7°C 46°F | 11.5°C | 113 mm 4.5 in |
| November | 11.3°C 52°F | 4.6°C 40°F | 8.0°C | 115 mm 4.5 in |
| December | 8.8°C 48°F | 2.6°C 37°F | 5.7°C | 112 mm 4.4 in |
| Year | 14.8°C | 6.6°C | 10.7°C | 979 mm |
Where Horndean’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 2 Met Office 2 km grid squares whose centre lies inside Horndean’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 Hurn, 37 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 Horndean’s climate
How warm does Horndean get in summer?
August is the warmest month, with average highs of 22.1°C (72°F). About 14 days a year reach 25°C (77°F), more than 67% of UK towns.
How cold does Horndean get in winter?
February nights average 1.8°C (35°F). The air drops below freezing on about 43 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Horndean get?
About 979 mm (39 in) a year, more than 76% of UK towns. November is the wettest month (115 mm) and May the driest (53 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Hurn (Bournemouth Airport) (37 miles away), averages 1,690 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 Horndean. 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 Horndean →
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