Weather in Old Greenwich, CT
Old Greenwich, Sunday, 9 August, 06:34
Partly cloudy. Feels like 73°. High 89°, low 72°.
Monthly outlook for Old Greenwich, CT: average high 83.4°, average low 69.2°. That is 1.5° above the climate normal for August. Precipitation is expected on 3 days (about 0.5 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 23 August (90.7°), the coolest 15 August (60.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 82° | 81.5° | +0.3° |
| 19 August – 28 August | 85.7° | 79.8° | +3.3° |
| 29 August – 7 September | at normal | 78.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Byram (5 mi).
0.01
Old Greenwich, Monday, 10 August
Light rain. High 87°, low 70°.
0.13Old Greenwich, Tuesday, 11 August
Rain. High 88°, low 73°.
0
Old Greenwich, Wednesday, 12 August
Overcast. High 78°, low 71°.
0.06Old Greenwich, Thursday, 13 August
Light rain. High 82°, low 68°.
0
Old Greenwich, Friday, 14 August
Clear. High 75°, low 62°.
0Old Greenwich, Saturday, 15 August
Clear. High 78°, low 60°.
0Old Greenwich, Sunday, 16 August
Overcast. High 79°, low 62°.
0.02Old Greenwich, Monday, 17 August
Light rain. High 82°, low 66°.
0.01Old Greenwich, Tuesday, 18 August
Light rain. High 81°, low 65°.
0.02Old Greenwich, Wednesday, 19 August
Light rain. High 81°, low 71°.
0
Old Greenwich, Thursday, 20 August
Mostly clear. High 83°, low 71°.
0.02Old Greenwich, Friday, 21 August
Light rain. High 88°, low 75°.
0.03Old Greenwich, Saturday, 22 August
Light rain. High 90°, low 76°.
0Old Greenwich, Sunday, 23 August
Clear. High 91°, low 73°.
0.18Old Greenwich, Monday, 24 August
Light rain. High 81°, low 74°.
0.08Old Greenwich, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.06Old Greenwich, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.16
Old Greenwich, Thursday, 27 August
Climate normal for this date — 60-year average.
0.21Old Greenwich, Friday, 28 August
Climate normal for this date — 60-year average.
0.14Old Greenwich, Saturday, 29 August
Climate normal for this date — 60-year average.
0.08Old Greenwich, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05Old Greenwich, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Old Greenwich, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.18Old Greenwich, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Old Greenwich, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Old Greenwich, Friday, 4 September
Climate normal for this date — 60-year average.
0.06Old Greenwich, Saturday, 5 September
Climate normal for this date — 60-year average.
0.2Old Greenwich, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Old Greenwich, 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 Old Greenwich, 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 Greenwich, 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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