5-day weather forecast San Francisco 18-05-2026
Weather forecast San Francisco Monday, May 18 18.05.2026: sunny, temperature from 13 °C to 19 °C.
No precipitation expected. Wind up to 9.69 m/s (gusts 18.08 m/s). Air humidity 32–78%, atmospheric pressure 758–761 mm Hg, UV index up to 8.5.
Sunrise 05:58
Sunset 20:15
Sunset 20:15
Waxing Crescent2% illuminated
Moonrise 07:15 · Moonset 23:10
Moonrise 07:15 · Moonset 23:10
Chart
Table
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Clear | 17 °C | 0% | 0% | 39% | 758 mm Hg | N 0° 4.89 (10.28) m/s | 0 |
| 01:00 | Clear | 17 °C | 0% | 0% | 38% | 758 mm Hg | N 350° 5.31 (11.14) m/s | 0 |
| 02:00 | Clear | 18 °C | 0% | 0% | 33% | 758 mm Hg | N 350° 7.39 (15.39) m/s | 0 |
| 03:00 | Clear | 18 °C | 0% | 0% | 32% | 758 mm Hg | N 354° 8.81 (16.97) m/s | 0 |
| 04:00 | Clear | 17 °C | 0% | 0% | 32% | 758 mm Hg | N 0° 9.69 (18.08) m/s | 0 |
| 05:00 | Clear | 17 °C | 0% | 1% | 33% | 758 mm Hg | N 1° 9.69 (17.72) m/s | 0 |
| 06:00 |  Sunny | 17 °C | 0% | 2% | 35% | 759 mm Hg | N 358° 8.69 (15.89) m/s | 0 |
| 07:00 | Sunny | 17 °C | 0% | 0% | 37% | 759 mm Hg | N 358° 7.5 (13.42) m/s | 0.2 |
| 08:00 | Sunny | 17 °C | 0% | 0% | 38% | 760 mm Hg | N 2° 6.11 (10.78) m/s | 0.9 |
| 09:00 | Sunny | 18 °C | 0% | 0% | 36% | 760 mm Hg | N 2° 6.19 (10.81) m/s | 2.2 |
| 10:00 | Sunny | 19 °C | 0% | 0% | 35% | 760 mm Hg | N 359° 5.81 (10.22) m/s | 4 |
| 11:00 | Sunny | 19 °C | 0% | 0% | 34% | 760 mm Hg | N 357° 4.81 (8.58) m/s | 6.1 |
| 12:00 | Sunny | 19 °C | 0% | 0% | 35% | 760 mm Hg | NNW 329° 4 (7.14) m/s | 7.8 |
| 13:00 | Sunny | 19 °C | 0% | 0% | 38% | 760 mm Hg | WNW 302° 4.39 (7.64) m/s | 8.5 |
| 14:00 | Sunny | 18 °C | 0% | 0% | 44% | 760 mm Hg | W 281° 4.81 (8.06) m/s | 8.2 |
| 15:00 | Sunny | 19 °C | 0% | 0% | 45% | 760 mm Hg | W 277° 5.39 (8.97) m/s | 6.8 |
| 16:00 | Sunny | 19 °C | 0% | 0% | 44% | 760 mm Hg | WNW 286° 6.31 (11.03) m/s | 4.8 |
| 17:00 | Sunny | 18 °C | 0% | 0% | 47% | 759 mm Hg | WNW 288° 7.11 (12.44) m/s | 2.8 |
| 18:00 | Sunny | 17 °C | 0% | 0% | 51% | 759 mm Hg | WNW 287° 6.31 (11.22) m/s | 1.3 |
| 19:00 | Sunny | 16 °C | 0% | 0% | 61% | 759 mm Hg | WNW 285° 5.31 (9.44) m/s | 0.4 |
| 20:00 | Sunny | 15 °C | 0% | 0% | 71% | 760 mm Hg | W 275° 3.81 (6.94) m/s | 0 |
| 21:00 | Clear | 14 °C | 0% | 0% | 75% | 760 mm Hg | W 267° 2.61 (4.72) m/s | 0 |
| 22:00 | Clear | 14 °C | 0% | 0% | 77% | 761 mm Hg | W 259° 2.11 (3.83) m/s | 0 |
| 23:00 | Clear | 13 °C | 0% | 0% | 78% | 761 mm Hg | WSW 249° 1.61 (2.97) 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.