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.

Sunrise 05:54
Sunset 19:41
First Quarter37% illuminated
Moonrise 12:47 · Moonset 22:20
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Table
Tue, Aug 18, 2026

Forecast from 17 °C to 25 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)201918181817171819212224242525252525232220202019
Precipitation (mm/hr)000000000000000000000000

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)2231238300039162216928131821232520148
Rain chance (%)81011101111119754322122345781011

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)3.3132.812.892.692.392.112.110.611.191.692.312.52.8133.313.613.893.693.393.193.193.113.11
Wind gust (m/s)5.815.475.145.254.924.393.943.220.721.3922.642.893.193.443.814.114.54.8155.285.315.315.28
Wind direction (°)NNW 334°NNW 341°N 353°N 4°N 5°N 2°N 359°N 358°NNW 330°WSW 239°SSE 148°ENE 57°ENE 72°E 87°ESE 103°ESE 107°ESE 110°ESE 114°SE 124°SE 133°SE 142°SSE 155°SSE 167°S 179°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)717580828485867973655750484645464849566370757983

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)760760760760761761761761761762762762761761761761761760761761761761761761

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index00000000.31666667776660000
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.