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| Th Jan 14 | Fr Jan 15 | Sa Jan 16 | Su Jan 17 | |
| Tmin 18-06 |
5°C | 1°C | 0°C | 1°C |
| Tmax 06-18 |
6°C | 5°C | 4°C | 3°C |
| morning 24-06 |
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| a.m. 06-12 |
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| p.m. 12-18 |
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| evening 18-24 |
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| Nearby Forecast Locations - Harpenden | Distance |
| Luton | 7.2 km |
| St Albans | 7.5 km |
| Hatfield | 11.8 km |
| Dunstable | 13.7 km |
| Dacorum | 13.8 km |
| Stevenage | 13.9 km |
| Watford | 18.7 km |
| Letchworth | 19.0 km |
| Cheshunt | 25.4 km |
| Hemel Hempstead | 29.0 km |
| Aylesbury | 31.0 km |
| Bletchley | 31.3 km |
| Harlow | 31.5 km |
| Slough | 31.9 km |
| High Wycombe | 34.4 km |
| Sawbridgeworth | 34.5 km |
| Milton Keynes | 34.5 km |
| London WC | 37.6 km |
| City of Westminster | 38.8 km |
| London | 38.8 km |
| Wolverton | 40.4 km |
| London Stansted Airport | 40.8 km |
| Windsor | 40.9 km |
| Maidenhead | 41.9 km |
| Staines-upon-Thames | 43.9 km |
| London City | 44.8 km |
| Molesey | 48.2 km |
| Brentwood | 50.1 km |
| Esher | 50.1 km |