5-day weather forecast Boston 18-08-2026
Weather forecast Boston Tuesday, August 18 18.08.2026: sunny, temperature from 17 °C to 25 °C.
Precipitation probability 11%. Wind up to 3.89 m/s (gusts 5.81 m/s). Air humidity 45–86%, atmospheric pressure 760–762 mm Hg, UV index up to 7.
5 days at a glance — tap a day to open it
Sunrise 05:54
Sunset 19:41
Sunset 19:41
First Quarter37% illuminated
Moonrise 12:47 · Moonset 22:20
Moonrise 12:47 · Moonset 22:20
Chart
Table
Tue, Aug 18, 2026
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Clear | 20 °C | 8% | 22% | 71% | 760 mm Hg | NNW 334° 3.31 (5.81) m/s | 0 |
| 01:00 |  Partly cloudy | 19 °C | 10% | 31% | 75% | 760 mm Hg | NNW 341° 3 (5.47) m/s | 0 |
| 02:00 | Clear | 18 °C | 11% | 23% | 80% | 760 mm Hg | N 353° 2.81 (5.14) m/s | 0 |
| 03:00 | Clear | 18 °C | 10% | 8% | 82% | 760 mm Hg | N 4° 2.89 (5.25) m/s | 0 |
| 04:00 | Clear | 18 °C | 11% | 3% | 84% | 761 mm Hg | N 5° 2.69 (4.92) m/s | 0 |
| 05:00 | Clear | 17 °C | 11% | 0% | 85% | 761 mm Hg | N 2° 2.39 (4.39) m/s | 0 |
| 06:00 |  Sunny | 17 °C | 11% | 0% | 86% | 761 mm Hg | N 359° 2.11 (3.94) m/s | 0 |
| 07:00 | Sunny | 18 °C | 9% | 0% | 79% | 761 mm Hg | N 358° 2.11 (3.22) m/s | 0.3 |
| 08:00 | Sunny | 19 °C | 7% | 3% | 73% | 761 mm Hg | NNW 330° 0.61 (0.72) m/s | 1 |
| 09:00 | Sunny | 21 °C | 5% | 9% | 65% | 762 mm Hg | WSW 239° 1.19 (1.39) m/s | 6 |
| 10:00 | Sunny | 22 °C | 4% | 16% | 57% | 762 mm Hg | SSE 148° 1.69 (2) m/s | 6 |
| 11:00 | Sunny | 24 °C | 3% | 22% | 50% | 762 mm Hg | ENE 57° 2.31 (2.64) m/s | 6 |
| 12:00 | Sunny | 24 °C | 2% | 16% | 48% | 761 mm Hg | ENE 72° 2.5 (2.89) m/s | 6 |
| 13:00 | Sunny | 25 °C | 2% | 9% | 46% | 761 mm Hg | E 87° 2.81 (3.19) m/s | 6 |
| 14:00 | Sunny | 25 °C | 1% | 2% | 45% | 761 mm Hg | ESE 103° 3 (3.44) m/s | 7 |
| 15:00 | Sunny | 25 °C | 2% | 8% | 46% | 761 mm Hg | ESE 107° 3.31 (3.81) m/s | 7 |
| 16:00 | Sunny | 25 °C | 2% | 13% | 48% | 761 mm Hg | ESE 110° 3.61 (4.11) m/s | 7 |
| 17:00 | Sunny | 25 °C | 3% | 18% | 49% | 760 mm Hg | ESE 114° 3.89 (4.5) m/s | 6 |
| 18:00 |  Partly cloudy | 23 °C | 4% | 21% | 56% | 761 mm Hg | SE 124° 3.69 (4.81) m/s | 6 |
| 19:00 | Sunny | 22 °C | 5% | 23% | 63% | 761 mm Hg | SE 133° 3.39 (5) m/s | 6 |
| 20:00 | Partly cloudy | 20 °C | 7% | 25% | 70% | 761 mm Hg | SE 142° 3.19 (5.28) m/s | 0 |
| 21:00 | Clear | 20 °C | 8% | 20% | 75% | 761 mm Hg | SSE 155° 3.19 (5.31) m/s | 0 |
| 22:00 | Partly cloudy | 20 °C | 10% | 14% | 79% | 761 mm Hg | SSE 167° 3.11 (5.31) m/s | 0 |
| 23:00 | Clear | 19 °C | 11% | 8% | 83% | 761 mm Hg | S 179° 3.11 (5.28) m/s | 0 |
Tue, Aug 18, 2026
Boston on the map
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.