5-day weather forecast Boston 04-09-2026

Weather forecast Boston tomorrow 04.09.2026: overcast, temperature from 18 °C to 28 °C.

Precipitation probability 45%. Wind up to 4.19 m/s (gusts 9.72 m/s). Air humidity 41–99%, atmospheric pressure 755–758 mm Hg, UV index up to 6.3.

Sunrise 06:12
Sunset 19:13
Last Quarter39% illuminated
Moonrise 22:59 · Moonset 14:26
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Table

Forecast from 18 °C to 28 °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)191919181919181819212325262727282828252423232221
Precipitation (mm/hr)0.010.020.020.0100000000000000000000

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 (%)1001001001007734100550100535610096614359210010052968947
Rain chance (%)4545444333244220192497111012391214815138

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)1.891.51.691.611.391.811.191.611.8122.392.52.392.311.611.892.192.114.191.391.111.813.894.19
Wind gust (m/s)2.51.892.532.813.222.831.312.643.143.314.114.114.114.424.314.534.424.227.8941.922.837.929.72
Wind direction (°)NNE 33°NE 43°NNE 15°N 7°NNW 343°NNW 335°NW 325°WNW 298°WNW 300°WNW 291°WNW 298°NW 307°NW 318°NNW 328°NW 322°NW 312°NW 310°NW 306°N 4°NNE 14°NNW 338°NW 313°NW 319°NNW 330°

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 (%)999998989796979691816656494645424141506063656263

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)758758758758758758758758758758758758757757756755755755755756756756756756

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 Index00000000.20.71.93.45.26.35.84.53.72.40.60.200000

Air quality & pollen

Air quality
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
PM2.5 (µg/m³)1815.311.58.87.36.66.36.88.78.88.28.17.87.57.37.16.66.26.58.410.710.18.97.6
PM10 (µg/m³)18.215.511.89.17.56.76.46.98.78.98.48.27.97.77.47.26.76.36.68.510.710.18.97.6
Ozone (O₃) (µg/m³)112233394548474447648710410710399999993775539343538
NO₂ (µg/m³)63.446.331.622.515.91212.61617.313.67.73.42.22.63.12.31.6412.824.632.231.827.122.2
SO₂ (µg/m³)1.41.10.90.80.70.60.60.70.70.70.60.60.60.50.50.50.50.50.60.70.80.80.70.6
CO (µg/m³)320254217244299329307259219197181169159154154162175192216243256243216192

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.