Weather in Chelmsford, MA
Chelmsford, Tuesday, 20 October, 14:52
Clear. Feels like 64°. High 66°, low 39°.
Monthly outlook for Chelmsford, MA: average high 56.9°, average low 36.8°. That is 0.1° below the climate normal for October. Precipitation is expected on 1 day (about 0.0 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 26 October (69.8°), the coolest 29 October (30.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 59.6° | 58° | +0.9° |
| 30 October – 8 November | 52.3° | 54.6° | -1.3° |
| 9 November – 18 November | at normal | 49.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Lowell (3 mi).
0Chelmsford, Wednesday, 21 October
Clear. High 57°, low 35°.
0Chelmsford, Thursday, 22 October
Clear. High 62°, low 39°.
0Chelmsford, Friday, 23 October
Clear. High 51°, low 39°.
0Chelmsford, Saturday, 24 October
Clear. High 58°, low 34°.
0Chelmsford, Sunday, 25 October
Clear. High 65°, low 35°.
0
Chelmsford, Monday, 26 October
Overcast. High 70°, low 44°.
0Chelmsford, Tuesday, 27 October
Overcast. High 66°, low 49°.
0.04
Chelmsford, Wednesday, 28 October
Light rain. High 51°, low 33°.
0Chelmsford, Thursday, 29 October
Clear. High 50°, low 31°.
0Chelmsford, Friday, 30 October
Overcast. High 58°, low 38°.
0Chelmsford, Saturday, 31 October
Clear. High 46°, low 34°.
0Chelmsford, Sunday, 1 November
Overcast. High 52°, low 35°.
0Chelmsford, Monday, 2 November
Clear. High 52°, low 36°.
0Chelmsford, Tuesday, 3 November
Clear. High 52°, low 33°.
0
Chelmsford, Wednesday, 4 November
Partly cloudy. High 53°, low 35°.
0.17Chelmsford, Thursday, 5 November
Climate normal for this date — 60-year average.
0.12
Chelmsford, Friday, 6 November
Climate normal for this date — 60-year average.
0.05
Chelmsford, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Chelmsford, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1Chelmsford, Monday, 9 November
Climate normal for this date — 60-year average.
0.16Chelmsford, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.11Chelmsford, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.11Chelmsford, Thursday, 12 November
Climate normal for this date — 60-year average.
0.15Chelmsford, Friday, 13 November
Climate normal for this date — 60-year average.
0.12Chelmsford, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Chelmsford, Sunday, 15 November
Climate normal for this date — 60-year average.
0.15Chelmsford, Monday, 16 November
Climate normal for this date — 60-year average.
0.14Chelmsford, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.07Chelmsford, Wednesday, 18 November
Climate normal for this date — 60-year average.
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.
Sun and moon today
Weather history
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