Weather in Old Lyme, CT
Old Lyme, Sunday, 18 October, 20:20
Clear. Feels like 44°. High 57°, low 33°.
Monthly outlook for Old Lyme, CT: average high 58.6°, average low 45°. That is 0.2° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 4 days and 2.1 inches. The warmest day looks like 20 October (64°), the coolest 18 October (33.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 58.3° | 59° | -0.4° |
| 28 October – 6 November | 59.2° | 56.4° | +1.6° |
| 7 November – 16 November | at normal | 52.2° | — |
October records over 66 years
0
Old Lyme, Monday, 19 October
Partly cloudy. High 62°, low 37°.
0
Old Lyme, Tuesday, 20 October
Clear. High 64°, low 45°.
0Old Lyme, Wednesday, 21 October
Partly cloudy. High 56°, low 43°.
0Old Lyme, Thursday, 22 October
Clear. High 63°, low 41°.
0Old Lyme, Friday, 23 October
Clear. High 53°, low 41°.
0Old Lyme, Saturday, 24 October
Clear. High 52°, low 36°.
0Old Lyme, Sunday, 25 October
Clear. High 56°, low 47°.
0Old Lyme, Monday, 26 October
Clear. High 63°, low 54°.
0Old Lyme, Tuesday, 27 October
Partly cloudy. High 56°, low 46°.
0Old Lyme, Wednesday, 28 October
Clear. High 52°, low 41°.
0Old Lyme, Thursday, 29 October
Clear. High 58°, low 46°.
0
Old Lyme, Friday, 30 October
Overcast. High 61°, low 54°.
0.07
Old Lyme, Saturday, 31 October
Light rain. High 62°, low 56°.
0Old Lyme, Sunday, 1 November
Clear. High 61°, low 51°.
0Old Lyme, Monday, 2 November
Overcast. High 60°, low 50°.
0.16Old Lyme, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Old Lyme, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.15
Old Lyme, Thursday, 5 November
Climate normal for this date — 60-year average.
0.11Old Lyme, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Old Lyme, Saturday, 7 November
Climate normal for this date — 60-year average.
0.13Old Lyme, Sunday, 8 November
Climate normal for this date — 60-year average.
0.09Old Lyme, Monday, 9 November
Climate normal for this date — 60-year average.
0.18Old Lyme, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.16Old Lyme, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.16Old Lyme, Thursday, 12 November
Climate normal for this date — 60-year average.
0.21Old Lyme, Friday, 13 November
Climate normal for this date — 60-year average.
0.09Old Lyme, Saturday, 14 November
Climate normal for this date — 60-year average.
0.13Old Lyme, Sunday, 15 November
Climate normal for this date — 60-year average.
0.15Old Lyme, Monday, 16 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 Old 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 Old 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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