5-day weather forecast Boston Sep 23, 2026

16°14–16° · Sunny

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

MinorSep 23, 02:24 AM — Sep 23, 03:30 PMTranslate with Google

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.

ModerateSep 23, 02:24 AM — Sep 23, 03:30 PMTranslate with Google

Gale Warning issued September 23 at 2:24AM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MA

Gale Warning

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

Waxing Gibbous95% illuminated
Moonrise 17:25 · Moonset 03:24

Chart

Table

Wed, Sep 23, 2026

Thu, Sep 24 →

Forecast from 14 °C to 16 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	14	14	14	14	14	14	14	14	15	16	16	16	16	16	16	16	15	15	14	14	14	14	14	14
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	71	96	100	91	99	93	28	59	50	37	5	5	3	5	1	4	29	92	69	100	100	15	0	0
Rain chance (%)	10	14	15	14	17	17	7	11	8	7	4	3	3	3	3	4	6	15	12	18	17	5	4	4

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	5.81	6.11	6.39	6.61	6.89	7	7.31	7.11	7.31	7.39	7.69	7.69	7.81	7.81	7.61	7.39	7	6.61	6.19	6	5.61	5.5	5.61	5.31
Wind gust (m/s)	9.92	10.22	9.92	9.5	9.81	10.31	10.5	10.03	10	10.47	10.72	10.83	10.64	10.42	10.11	9.92	9.42	9.72	9.72	10	9.81	9.53	9.89	9.11
Wind direction (°)	ENE 60°	NE 56°	NE 54°	NE 51°	NE 49°	NE 48°	NE 49°	NE 51°	NE 53°	NE 56°	ENE 58°	ENE 58°	ENE 59°	ENE 57°	NE 56°	NE 54°	NE 55°	NE 52°	NE 51°	NE 55°	ENE 60°	ENE 61°	ENE 63°	ENE 63°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	60	60	60	63	67	68	68	68	65	62	59	57	56	57	58	60	62	64	68	70	67	64	62	62

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	773	773	773	773	773	774	774	774	775	775	776	776	776	776	776	775	775	775	775	775	775	775	775	775

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.4	1.2	2.4	3.7	4.7	4.9	4.3	3.1	1.8	0.7	0.2	0	0	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	7.2	7.2	7	6.7	6.5	6.5	6.8	7.5	8.3	8.6	7.7	6.7	5.6	5.2	5.3	5.4	5.5	5.7	5.9	6.7	7.5	8.1	8.3	8.4
PM10 (µg/m³)	9.1	9.2	9.1	8.8	8.7	8.7	9.1	10	11.1	11.7	10.8	9.5	8.4	7.9	8.1	8.2	8.4	8.5	8.8	9.8	10.9	11.6	11.8	11.9
Ozone (O₃) (µg/m³)	42	45	47	48	49	49	48	47	48	54	61	68	72	75	77	77	75	73	70	66	63	61	61	60
NO₂ (µg/m³)	15	12.2	9.9	8.5	7.6	7.2	7.7	8.7	8.8	7	4.3	2.2	1.5	1.5	1.7	1.8	2.1	2.9	4.7	7	8.8	9.6	9.9	9.7
SO₂ (µg/m³)	0.7	0.7	0.7	0.8	0.8	0.9	0.9	0.9	0.8	0.7	0.6	0.6	0.7	0.8	0.9	0.9	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
CO (µg/m³)	158	149	142	138	135	135	141	149	153	148	139	132	131	132	134	137	141	144	146	148	149	148	146	144

Wed, Sep 23, 2026

Thu, Sep 24 →

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.

Learn more about our methodology →