As of 04:25 EDT

Weather in Chelmsford, MA

42°

Chelmsford, Friday, 23 October, 04:25

Clear. Feels like 40°. High 56°, low 39°.

Pressure30.18 inHg

Wind3.4 mph N

Humidity72%

Visibility6.2 mi

Dew point34°

See detailed hourly forecast

Monthly outlook for Chelmsford, MA: average high 56.9°, average low 41.4°. That is 0.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 26 October (67.4°), the coolest 7 November (28.1°).

56.9°/41.4°

Average high / low

+0.6°

Above normal

4 / 5

Wet days / normal

1.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
23 October – 1 November	59.6°	56.7°	+1.6°
2 November – 11 November	52.3°	53.4°	-0.6°
12 November – 21 November	at normal	47.9°	—

October records over 66 years

85.6°5 October 2007All-time high

24.8°31 October 2020All-time low

Climate normals and records are computed from the nearest reference point — Lowell (3 mi).

Sat, 2460° / 34°

60 °

Chelmsford, Saturday, 24 October

Clear. High 60°, low 34°.

Pressure30.50 inHg

Wind1.1 mph W

Humidity41%

Visibility6.2 mi

Dew point28°

Sun, 2564° / 33°

64 °

Chelmsford, Sunday, 25 October

Clear. High 64°, low 33°.

Pressure30.50 inHg

Wind2.3 mph S

Humidity33%

Visibility6.2 mi

Dew point31°

Mon, 2667° / 42°

67 °

Chelmsford, Monday, 26 October

Clear. High 67°, low 42°.

Pressure30.18 inHg

Wind4.9 mph W

Humidity35%

Visibility6.2 mi

Dew point36°

Tue, 2750° / 37°

50 °

Chelmsford, Tuesday, 27 October

Mostly clear. High 50°, low 37°.

Pressure30.36 inHg

Wind7.9 mph NW

Humidity53%

Visibility—

Dew point30°

Wed, 2851° / 31°

51 °

Chelmsford, Wednesday, 28 October

Mostly clear. High 51°, low 31°.

Pressure30.50 inHg

Wind4.1 mph SW

Humidity56%

Visibility—

Dew point29°

Thu, 2963° / 42°

63 °

Chelmsford, Thursday, 29 October

Clear. High 63°, low 42°.

Pressure30.42 inHg

Wind9.5 mph SW

Humidity60%

Visibility—

Dew point41°

Fri, 3066° / 50°

66 °

Chelmsford, Friday, 30 October

Overcast. High 66°, low 50°.

Pressure30.15 inHg

Wind9.3 mph SW

Humidity61%

Visibility—

Dew point46°

Sat, 3159° / 46°

0.01

59 °

Chelmsford, Saturday, 31 October

Light rain. High 59°, low 46°.

Pressure30.30 inHg

Wind6.8 mph E

Humidity69%

Visibility—

Dew point48°

Sun, 0161° / 47°

0.02

61 °

Chelmsford, Sunday, 1 November

Light rain. High 61°, low 47°.

Pressure30.33 inHg

Wind10.7 mph SW

Humidity85%

Visibility—

Dew point45°

Mon, 0262° / 57°

0.45

62 °

Chelmsford, Monday, 2 November

Light rain. High 62°, low 57°.

Pressure30.09 inHg

Wind7.3 mph SW

Humidity93%

Visibility—

Dew point60°

Tue, 0357° / 50°

0.31

57 °

Chelmsford, Tuesday, 3 November

Light rain. High 57°, low 50°.

Pressure30.09 inHg

Wind5.3 mph NE

Humidity97%

Visibility—

Dew point53°

Wed, 0452° / 45°

0.07

52 °

Chelmsford, Wednesday, 4 November

Light rain. High 52°, low 45°.

Pressure30.24 inHg

Wind7.9 mph E

Humidity74%

Visibility—

Dew point41°

Thu, 0550° / 40°

0.81

50 °

Chelmsford, Thursday, 5 November

Rain. High 50°, low 40°.

Pressure29.53 inHg

Wind13 mph NW

Humidity95%

Visibility—

Dew point44°

Fri, 0651° / 41°

51 °

Chelmsford, Friday, 6 November

Overcast. High 51°, low 41°.

Pressure29.65 inHg

Wind14.6 mph SW

Humidity64%

Visibility—

Dew point36°

Sat, 0743° / 28°

0.03

43 °

Chelmsford, Saturday, 7 November

Light rain. High 43°, low 28°.

Pressure29.88 inHg

Wind14.4 mph W

Humidity32%

Visibility—

Dew point9°

From day 17 onward the outlook is built from 60-year climate statistics

Sun, 0852° / 38°

0.09

52 °

Chelmsford, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.09 in

Chance of precipitation27%

Record high71° (2020)

Record low26° (1960)

Mon, 0952° / 38°

0.1

52 °

Chelmsford, Monday, 9 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.1 in

Chance of precipitation28%

Record high70° (2020)

Record low23° (2019)

Tue, 1052° / 38°

0.16

52 °

Chelmsford, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.16 in

Chance of precipitation32%

Record high73° (2020)

Record low24° (2017)

Wed, 1151° / 38°

0.11

51 °

Chelmsford, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high51°

Average low38°

Average precipitation0.11 in

Chance of precipitation37%

Record high73° (2020)

Record low21° (2017)

Thu, 1249° / 37°

0.11

49 °

Chelmsford, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high49°

Average low37°

Average precipitation0.11 in

Chance of precipitation38%

Record high73° (2022)

Record low24° (2017)

Fri, 1348° / 35°

0.15

48 °

Chelmsford, Friday, 13 November

Climate normal for this date — 60-year average.

Average high48°

Average low35°

Average precipitation0.15 in

Chance of precipitation38%

Record high69° (1964)

Record low16° (2019)

Sat, 1448° / 35°

0.12

48 °

Chelmsford, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high48°

Average low35°

Average precipitation0.12 in

Chance of precipitation25%

Record high66° (1973)

Record low13° (1986)

Sun, 1549° / 35°

0.12

49 °

Chelmsford, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high49°

Average low35°

Average precipitation0.12 in

Chance of precipitation37%

Record high73° (1993)

Record low20° (2018)

Mon, 1649° / 35°

0.15

49 °

Chelmsford, Monday, 16 November

Climate normal for this date — 60-year average.

Average high49°

Average low35°

Average precipitation0.15 in

Chance of precipitation28%

Record high67° (2005)

Record low15° (1967)

Tue, 1748° / 33°

0.14

48 °

Chelmsford, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high48°

Average low33°

Average precipitation0.14 in

Chance of precipitation30%

Record high65° (2006)

Record low10° (1972)

Wed, 1848° / 34°

0.07

48 °

Chelmsford, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high48°

Average low34°

Average precipitation0.07 in

Chance of precipitation23%

Record high67° (1987)

Record low23° (2020)

Thu, 1947° / 33°

0.05

47 °

Chelmsford, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high47°

Average low33°

Average precipitation0.05 in

Chance of precipitation20%

Record high64° (1991)

Record low15° (1986)

Fri, 2047° / 33°

0.13

47 °

Chelmsford, Friday, 20 November

Climate normal for this date — 60-year average.

Average high47°

Average low33°

Average precipitation0.13 in

Chance of precipitation32%

Record high69° (1991)

Record low11° (1986)

Sat, 2146° / 32°

0.13

46 °

Chelmsford, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high46°

Average low32°

Average precipitation0.13 in

Chance of precipitation35%

Record high61° (1991)

Record low17° (1967)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Chelmsford, MA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Chelmsford, MA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.