5-day weather forecast London Sep 21, 2026
23°Weather forecast London tomorrow Sep 21, 2026: sunny, temperature from 13 °C to 23 °C.
Precipitation probability 12%. Wind up to 2 m/s (gusts 2.94 m/s). Air humidity 30–59%, atmospheric pressure 773–775 mm Hg, UV index up to 3.9.
5 days at a glance — tap a day to open it
Sunrise 06:45
Sunset 19:01
Sunset 19:01
Waxing Gibbous82% illuminated
Moonrise 17:25 · Moonset 00:38
Moonrise 17:25 · Moonset 00:38
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Overcast | 15 °C | 12% | 100% | 50% | 774 mm Hg | NW 325° 1 (1.22) m/s | 0 |
| 01:00 |  Partly cloudy | 14 °C | 7% | 61% | 51% | 774 mm Hg | NNW 348° 1 (1.11) m/s | 0 |
| 02:00 | Overcast | 14 °C | 11% | 89% | 53% | 774 mm Hg | N 357° 0.69 (0.81) m/s | 0 |
| 03:00 | Partly cloudy | 14 °C | 5% | 36% | 55% | 774 mm Hg | NNW 337° 0.61 (0.72) m/s | 0 |
| 04:00 | Overcast | 13 °C | 12% | 92% | 56% | 774 mm Hg | N 359° 1.19 (1.61) m/s | 0 |
| 05:00 | Partly cloudy | 13 °C | 8% | 59% | 58% | 774 mm Hg | NNE 15° 0.89 (1.03) m/s | 0 |
| 06:00 | Partly cloudy | 13 °C | 6% | 37% | 58% | 774 mm Hg | NNE 15° 0.39 (0.42) m/s | 0 |
| 07:00 |  Cloudy | 13 °C | 9% | 67% | 59% | 774 mm Hg | NNE 32° 0.19 (0.19) m/s | 0 |
| 08:00 | Sunny | 13 °C | 3% | 10% | 56% | 775 mm Hg | SSW 203° 0.39 (0.64) m/s | 0.2 |
| 09:00 |  Overcast | 15 °C | 10% | 88% | 50% | 775 mm Hg | WSW 246° 1.11 (1.72) m/s | 0.8 |
| 10:00 | Overcast | 16 °C | 9% | 89% | 45% | 775 mm Hg | WSW 256° 1.39 (2) m/s | 1.7 |
| 11:00 | Cloudy | 18 °C | 5% | 66% | 39% | 774 mm Hg | W 267° 1.61 (2.22) m/s | 2.4 |
| 12:00 | Sunny | 19 °C | 1% | 16% | 33% | 774 mm Hg | W 268° 1.69 (2.22) m/s | 3.6 |
| 13:00 |  Partly cloudy | 21 °C | 4% | 53% | 30% | 774 mm Hg | WNW 288° 1.61 (2.11) m/s | 3.9 |
| 14:00 | Partly cloudy | 21 °C | 4% | 60% | 30% | 773 mm Hg | WNW 287° 2 (2.61) m/s | 3.6 |
| 15:00 | Sunny | 22 °C | 1% | 5% | 32% | 773 mm Hg | WNW 288° 2 (2.81) m/s | 2.8 |
| 16:00 | Sunny | 23 °C | 1% | 5% | 34% | 773 mm Hg | WNW 292° 1.69 (2.94) m/s | 1.7 |
| 17:00 | Sunny | 23 °C | 1% | 8% | 38% | 773 mm Hg | WNW 299° 1.31 (2.61) m/s | 0.8 |
| 18:00 | Partly cloudy | 22 °C | 2% | 25% | 42% | 773 mm Hg | NW 305° 1.19 (2.31) m/s | 0.2 |
| 19:00 | Sunny | 21 °C | 2% | 14% | 48% | 773 mm Hg | WNW 295° 0.81 (0.83) m/s | 0 |
| 20:00 |  Clear | 20 °C | 2% | 0% | 51% | 773 mm Hg | NW 320° 0.89 (1) m/s | 0 |
| 21:00 | Clear | 20 °C | 3% | 0% | 55% | 773 mm Hg | NNW 345° 0.89 (1.11) m/s | 0 |
| 22:00 | Clear | 19 °C | 3% | 0% | 58% | 773 mm Hg | ENE 62° 0.5 (0.5) m/s | 0 |
| 23:00 | Clear | 19 °C | 3% | 0% | 59% | 773 mm Hg | SSE 155° 0.61 (0.69) m/s | 0 |
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Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.