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| Su 10 | Mo 11 | Tu 12 | We 13 | Th 14 | Fr 15 | Sa 16 | Su 17 | |
| Tmax (°C) | 3 | 7 | 7 | 10 | 6 | 4 | 3 | 3 |
| Tmin (°C) | -1 | 1 | 6 | -1 | 5 | 2 | 0 | 1 |
| 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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| Rain risk | 40 % | 25 % | 55 % | 95 % | 55 % | 45 % | 45 % | 35 % |
| Sunshine hours | ![]() |
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| (hrs) | 1.2 | 0.8 | 0.0 | 0.0 | 0.0 | 1.2 | 1.2 | 0.4 |
| UV index | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| Sunrise Sunset |
08:05 16:12 |
08:05 16:13 |
08:04 16:15 |
08:03 16:16 |
08:02 16:18 |
08:02 16:19 |
08:01 16:21 |
08:00 16:22 |
| Wind p.m. | ![]() |
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| Bft | W 2-3 | W 4 | N 2-3 | W 3 | S 2-3 | N 3 | SW 3 | E 2-3 |
| Nearby Forecast Locations - Letchworth | Distance |
| Stevenage | 7.5 km |
| Luton | 17.7 km |
| Harpenden | 19.0 km |
| Dunstable | 22.6 km |
| Hatfield | 24.1 km |
| St Albans | 25.4 km |
| Dacorum | 31.1 km |
| Harlow | 31.1 km |
| Sawbridgeworth | 31.3 km |
| London Stansted Airport | 32.3 km |
| Cheshunt | 32.3 km |
| Bedford | 33.3 km |
| Bletchley | 34.3 km |
| Milton Keynes | 35.9 km |
| Watford | 37.1 km |
| Cambridge | 37.7 km |
| Huntingdon | 39.1 km |
| Wolverton | 41.0 km |
| Aylesbury | 44.2 km |
| Haverhill | 46.4 km |
| Hemel Hempstead | 47.7 km |
| Wellingborough | 48.9 km |
| Slough | 50.2 km |
| London WC | 50.7 km |
| High Wycombe | 51.0 km |
| City of Westminster | 52.4 km |
| London | 52.4 km |
| Braintree | 52.7 km |
| Brentwood | 52.8 km |