Weather in South Lyme, CT
South Lyme, Sunday, 9 August, 06:57
Partly cloudy. Feels like 76°. High 89°, low 72°.
Monthly outlook for South Lyme, CT: average high 78.2°, average low 67.2°. That is 0.4° below the climate normal for August. Precipitation is expected on 7 days (about 0.9 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 9 August (88.6°), the coolest 15 August (59.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 78.3° | 79.5° | -0.7° |
| 19 August – 28 August | 78.1° | 78° | +0° |
| 29 August – 7 September | at normal | 76.5° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Fishers Island (14 mi).
0.04
South Lyme, Monday, 10 August
Light rain. High 85°, low 69°.
0.11South Lyme, Tuesday, 11 August
Light rain. High 81°, low 71°.
0
South Lyme, Wednesday, 12 August
Overcast. High 73°, low 67°.
0.16South Lyme, Thursday, 13 August
Light rain. High 79°, low 67°.
0
South Lyme, Friday, 14 August
Clear. High 74°, low 60°.
0South Lyme, Saturday, 15 August
Clear. High 77°, low 60°.
0South Lyme, Sunday, 16 August
Overcast. High 76°, low 62°.
0.07South Lyme, Monday, 17 August
Light rain. High 75°, low 64°.
0.06South Lyme, Tuesday, 18 August
Light rain. High 74°, low 63°.
0.01South Lyme, Wednesday, 19 August
Light rain. High 75°, low 66°.
0South Lyme, Thursday, 20 August
Partly cloudy. High 76°, low 70°.
0.14South Lyme, Friday, 21 August
Rain. High 79°, low 72°.
0.14South Lyme, Saturday, 22 August
Rain. High 81°, low 73°.
0South Lyme, Sunday, 23 August
Clear. High 80°, low 69°.
0.11South Lyme, Monday, 24 August
Light rain. High 78°, low 71°.
0.09South Lyme, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.09South Lyme, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11South Lyme, Thursday, 27 August
Climate normal for this date — 60-year average.
0.19
South Lyme, Friday, 28 August
Climate normal for this date — 60-year average.
0.17South Lyme, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11South Lyme, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05South Lyme, Monday, 31 August
Climate normal for this date — 60-year average.
0.08South Lyme, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.22South Lyme, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.12South Lyme, Thursday, 3 September
Climate normal for this date — 60-year average.
0.13South Lyme, Friday, 4 September
Climate normal for this date — 60-year average.
0.06
South Lyme, Saturday, 5 September
Climate normal for this date — 60-year average.
0.15South Lyme, Sunday, 6 September
Climate normal for this date — 60-year average.
0.11South Lyme, 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 Lyme, CT 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 Lyme, CT 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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