5-day weather forecast Boston Sep 23, 2026
15°Weather forecast Boston today Sep 23, 2026: sunny, temperature from 14 °C to 16 °C.
Precipitation probability 18%. Wind up to 7.81 m/s (gusts 10.83 m/s). Air humidity 56–70%, atmospheric pressure 773–776 mm Hg, UV index up to 4.9.
Weather Alerts
Small Craft Advisory issued September 23 at 2:24AM EDT until September 25 at 8:00AM EDT by NWS Boston/Norton MA
Small Craft Advisory
* WHAT...For the Small Craft Advisory, northeast winds 15 to 25
kt with gusts up to 30 kt and waves 2 to 3 feet. For the Gale
Warning, north winds 20 to 30 kt with gusts up to 40 kt and
waves 2 to 4 feet expected.
* WHERE...Boston Harbor.
* WHEN...For the Small Craft Advisory, until 8 AM EDT Friday.
For the Gale Warning, from 8 AM Friday to 8 PM EDT Saturday.
* IMPACTS...Strong winds will cause hazardous waves which could
capsize or damage vessels and reduce visibility.
Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.
Gale Warning issued September 23 at 2:24AM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MA
Gale Warning
* WHAT...For the Small Craft Advisory, northeast winds 15 to 25
kt with gusts up to 30 kt and waves 2 to 3 feet. For the Gale
Warning, north winds 20 to 30 kt with gusts up to 40 kt and
waves 2 to 4 feet expected.
* WHERE...Boston Harbor.
* WHEN...For the Small Craft Advisory, until 8 AM EDT Friday.
For the Gale Warning, from 8 AM Friday to 8 PM EDT Saturday.
* IMPACTS...Strong winds will cause hazardous waves which could
capsize or damage vessels and reduce visibility.
Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.
5 days at a glance — tap a day to open it
Sunrise 06:32
Sunset 18:40
Sunset 18:40
Waxing Gibbous95% illuminated
Moonrise 17:25 · Moonset 03:24
Moonrise 17:25 · Moonset 03:24
Chart
Table
Wed, Sep 23, 2026
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Cloudy | 14 °C | 10% | 71% | 60% | 773 mm Hg | ENE 60° 5.81 (9.92) m/s | 0 |
| 01:00 |  Overcast | 14 °C | 14% | 96% | 60% | 773 mm Hg | NE 56° 6.11 (10.22) m/s | 0 |
| 02:00 | Overcast | 14 °C | 15% | 100% | 60% | 773 mm Hg | NE 54° 6.39 (9.92) m/s | 0 |
| 03:00 | Overcast | 14 °C | 14% | 91% | 63% | 773 mm Hg | NE 51° 6.61 (9.5) m/s | 0 |
| 04:00 | Overcast | 14 °C | 17% | 99% | 67% | 773 mm Hg | NE 49° 6.89 (9.81) m/s | 0 |
| 05:00 | Overcast | 14 °C | 17% | 93% | 68% | 774 mm Hg | NE 48° 7 (10.31) m/s | 0 |
| 06:00 |  Partly cloudy | 14 °C | 7% | 28% | 68% | 774 mm Hg | NE 49° 7.31 (10.5) m/s | 0 |
| 07:00 | Partly cloudy | 14 °C | 11% | 59% | 68% | 774 mm Hg | NE 51° 7.11 (10.03) m/s | 0 |
| 08:00 | Partly cloudy | 15 °C | 8% | 50% | 65% | 775 mm Hg | NE 53° 7.31 (10) m/s | 0.4 |
| 09:00 | Partly cloudy | 16 °C | 7% | 37% | 62% | 775 mm Hg | NE 56° 7.39 (10.47) m/s | 1.2 |
| 10:00 |  Sunny | 16 °C | 4% | 5% | 59% | 776 mm Hg | ENE 58° 7.69 (10.72) m/s | 2.4 |
| 11:00 | Sunny | 16 °C | 3% | 5% | 57% | 776 mm Hg | ENE 58° 7.69 (10.83) m/s | 3.7 |
| 12:00 | Sunny | 16 °C | 3% | 3% | 56% | 776 mm Hg | ENE 59° 7.81 (10.64) m/s | 4.7 |
| 13:00 | Sunny | 16 °C | 3% | 5% | 57% | 776 mm Hg | ENE 57° 7.81 (10.42) m/s | 4.9 |
| 14:00 | Sunny | 16 °C | 3% | 1% | 58% | 776 mm Hg | NE 56° 7.61 (10.11) m/s | 4.3 |
| 15:00 | Sunny | 16 °C | 4% | 4% | 60% | 775 mm Hg | NE 54° 7.39 (9.92) m/s | 3.1 |
| 16:00 | Partly cloudy | 15 °C | 6% | 29% | 62% | 775 mm Hg | NE 55° 7 (9.42) m/s | 1.8 |
| 17:00 |  Overcast | 15 °C | 15% | 92% | 64% | 775 mm Hg | NE 52° 6.61 (9.72) m/s | 0.7 |
| 18:00 |  Cloudy | 14 °C | 12% | 69% | 68% | 775 mm Hg | NE 51° 6.19 (9.72) m/s | 0.2 |
| 19:00 | Overcast | 14 °C | 18% | 100% | 70% | 775 mm Hg | NE 55° 6 (10) m/s | 0 |
| 20:00 | Overcast | 14 °C | 17% | 100% | 67% | 775 mm Hg | ENE 60° 5.61 (9.81) m/s | 0 |
| 21:00 |  Clear | 14 °C | 5% | 15% | 64% | 775 mm Hg | ENE 61° 5.5 (9.53) m/s | 0 |
| 22:00 | Clear | 14 °C | 4% | 0% | 62% | 775 mm Hg | ENE 63° 5.61 (9.89) m/s | 0 |
| 23:00 | Clear | 14 °C | 4% | 0% | 62% | 775 mm Hg | ENE 63° 5.31 (9.11) m/s | 0 |
Wed, Sep 23, 2026
Frequently asked questions about the 5-day weather in Boston
What will the weather be like in Boston over the next 5 days?
Over the next 5 days in Boston the temperature is expected to range from about 11 to 16 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in Boston?
The chance of rain in Boston over the next 5 days reaches 94%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for Boston?
A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.
Which of the next 5 days in Boston will be the warmest and which the coolest?
Over the next 5 days the temperature in Boston ranges from about 11 to 16 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in Boston over the next 5 days?
Over the next 5 days the wind in Boston picks up to 15 m/s. The windiest days are easy to spot on the wind chart above.
Which day of the week in Boston is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 94%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for Boston?
The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.
Will I need an umbrella or sunscreen in Boston this week?
Rain reaches a 94% chance across the next 5 days, so pack something waterproof for the wettest of them — the daily strip above shows which. Today’s UV index peaks at 4.9; sunscreen is worth it from about 3 upwards.
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.