New Haven weather in August: New Haven, Connecticut: normal highs, lows, rain and records for August
New Haven in August has a normal high of 81°F and a normal low of 65°F, a daily mean of 73°F, falling from 82°F on the 1st to 79°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 18°C, 90 mm of precipitation in August.
- NOAA stationNew Haven Tweed Airport
- Station IDUSW00014758
- Location41.26°N 72.89°W
- Elevation3 ft (1 m)
- From the center4 miles
- Population137,562
- Jan 38° 23°
- Feb 40° 24°
- Mar 47° 30°
- Apr 58° 39°
- May 68° 49°
- Jun 76° 59°
- Jul 82° 66°
- Aug 81° 65°
- Sep 75° 57°
- Oct 64° 46°
- Nov 53° 36°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is New Haven in August?
The normal high is 81°F and the normal low 65°F, for a daily mean of 72.9°F. August is 1.0°F cooler than July and 6.9°F warmer than September. August is the 2nd warmest month of the year in New Haven and the 5th wettest. Across the month the normal high falls 3°F, from 82°F on August 1 to 79°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 71°F and 75°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 82°F | 66°F | 35% | 20% |
| August 8 | 82°F | 66°F | 34% | 20% |
| August 15 | 81°F | 65°F | 33% | 19% |
| August 22 | 81°F | 64°F | 31% | 19% |
| August 31 | 79°F | 62°F | 30% | 17% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 82°F | 66°F | 35% | 20% | 14 h 20 min |
| August 2 | 82°F | 66°F | 35% | 20% | 14 h 20 min |
| August 3 | 82°F | 66°F | 35% | 20% | 14 h 20 min |
| August 4 | 82°F | 66°F | 34% | 20% | 14 h 20 min |
| August 5 | 82°F | 66°F | 34% | 20% | 14 h 20 min |
| August 6 | 82°F | 66°F | 34% | 20% | 14 h 10 min |
| August 7 | 82°F | 66°F | 34% | 20% | 14 h 10 min |
| August 8 | 82°F | 66°F | 34% | 20% | 14 h 10 min |
| August 9 | 82°F | 66°F | 34% | 20% | 14 h 10 min |
| August 10 | 82°F | 66°F | 34% | 20% | 14 h |
| August 11 | 82°F | 66°F | 33% | 20% | 14 h |
| August 12 | 82°F | 66°F | 33% | 20% | 14 h |
| August 13 | 82°F | 65°F | 33% | 20% | 14 h |
| August 14 | 81°F | 65°F | 33% | 20% | 14 h |
| August 15 | 81°F | 65°F | 33% | 19% | 13 h 50 min |
| August 16 | 81°F | 65°F | 32% | 19% | 13 h 50 min |
| August 17 | 81°F | 65°F | 32% | 19% | 13 h 50 min |
| August 18 | 81°F | 65°F | 32% | 19% | 13 h 50 min |
| August 19 | 81°F | 65°F | 32% | 19% | 13 h 40 min |
| August 20 | 81°F | 64°F | 31% | 19% | 13 h 40 min |
| August 21 | 81°F | 64°F | 31% | 19% | 13 h 40 min |
| August 22 | 81°F | 64°F | 31% | 19% | 13 h 40 min |
| August 23 | 80°F | 64°F | 31% | 18% | 13 h 30 min |
| August 24 | 80°F | 64°F | 31% | 18% | 13 h 30 min |
| August 25 | 80°F | 63°F | 30% | 18% | 13 h 30 min |
| August 26 | 80°F | 63°F | 30% | 18% | 13 h 30 min |
| August 27 | 80°F | 63°F | 30% | 18% | 13 h 20 min |
| August 28 | 80°F | 63°F | 30% | 18% | 13 h 20 min |
| August 29 | 79°F | 63°F | 30% | 18% | 13 h 20 min |
| August 30 | 79°F | 62°F | 30% | 17% | 13 h 20 min |
| August 31 | 79°F | 62°F | 30% | 17% | 13 h 10 min |
- Normal high
- 81°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 3.55 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 21
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014758; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in New Haven in August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 1 (35%). In all, 3.55 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in New Haven, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014758.
What are the records for August in New Haven?
The warmest August temperature on this station's record (since 1948) is 100°F, on August 27, 1948; the coldest is 43°F, on August 31, 1976. The wettest August brought 10.95 in (1955).
The August mean against the 1991-2020 normal of 72.9°F: 2021 76.7°F (+3.8), 2022 78.5°F (+5.6), 2023 74.0°F (+1.1), 2024 74.4°F (+1.5). 4 of 4 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.7°F | +3.8°F | 2.40 in |
| 2022 | 78.5°F | +5.6°F | 1.00 in |
| 2023 | 74.0°F | +1.1°F | 3.42 in |
| 2024 | 74.4°F | +1.5°F | 6.03 in |
Source: records: ACIS, station USW00014758; recent months: ACIS, station USW00014758. Records and recent months use complete months only.
How does August in New Haven compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, August normal highs run from 76°F in Norfolk to 83°F in Hartford; New Haven's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.