Weather in South Chelmsford, MA
South Chelmsford, Sunday, 9 August, 13:35
Clear. Feels like 93°. High 88°, low 69°.
Monthly outlook for South Chelmsford, MA: average high 81.5°, average low 61.6°. That is 1° above the climate normal for August. Precipitation is expected on 5 days (about 1.4 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 10 August (90.5°), the coolest 16 August (56.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.7° | 80.5° | +0.7° |
| 19 August – 28 August | 81.2° | 78.7° | +1.4° |
| 29 August – 7 September | at normal | 76.7° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Lawrence (14 mi).
0
South Chelmsford, Monday, 10 August
Mostly clear. High 91°, low 68°.
0
South Chelmsford, Tuesday, 11 August
Overcast. High 88°, low 65°.
0
South Chelmsford, Wednesday, 12 August
Partly cloudy. High 86°, low 62°.
0.18
South Chelmsford, Thursday, 13 August
Light rain. High 82°, low 63°.
0South Chelmsford, Friday, 14 August
Clear. High 77°, low 57°.
0South Chelmsford, Saturday, 15 August
Clear. High 78°, low 57°.
0South Chelmsford, Sunday, 16 August
Overcast. High 81°, low 56°.
0.16South Chelmsford, Monday, 17 August
Light rain. High 66°, low 60°.
0.26South Chelmsford, Tuesday, 18 August
Rain. High 80°, low 60°.
0South Chelmsford, Wednesday, 19 August
Overcast. High 78°, low 60°.
0.14South Chelmsford, Thursday, 20 August
Light rain. High 81°, low 63°.
0South Chelmsford, Friday, 21 August
Overcast. High 82°, low 61°.
0South Chelmsford, Saturday, 22 August
Clear. High 86°, low 61°.
0.69South Chelmsford, Sunday, 23 August
Rain. High 84°, low 66°.
0South Chelmsford, Monday, 24 August
Clear. High 77°, low 56°.
0.12South Chelmsford, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.04South Chelmsford, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.08
South Chelmsford, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12South Chelmsford, Friday, 28 August
Climate normal for this date — 60-year average.
0.15South Chelmsford, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11South Chelmsford, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09South Chelmsford, Monday, 31 August
Climate normal for this date — 60-year average.
0.05South Chelmsford, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.14South Chelmsford, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11South Chelmsford, Thursday, 3 September
Climate normal for this date — 60-year average.
0.11South Chelmsford, Friday, 4 September
Climate normal for this date — 60-year average.
0.08South Chelmsford, Saturday, 5 September
Climate normal for this date — 60-year average.
0.13South Chelmsford, Sunday, 6 September
Climate normal for this date — 60-year average.
0.11South Chelmsford, Monday, 7 September
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 South 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 South 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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