Hartford weather in September: Hartford, Connecticut: normal highs, lows, rain and records for September
Hartford in September has a normal high of 76°F and a normal low of 54°F, a daily mean of 65°F, falling from 81°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 4.39 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 12°C, 112 mm of precipitation in September.
- NOAA stationHartford-Bradley International Airport
- Station IDUSW00014740
- Location41.94°N 72.68°W
- Elevation190 ft (58 m)
- From the center12 miles
- Population122,129
- Jan 35° 19°
- Feb 39° 21°
- Mar 47° 28°
- Apr 61° 38°
- May 72° 48°
- Jun 80° 58°
- Jul 85° 63°
- Aug 83° 62°
- Sep 76° 54°
- Oct 64° 42°
- Nov 52° 33°
- Dec 41° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hartford in September?
The normal high is 76°F and the normal low 54°F, for a daily mean of 64.8°F. September is 7.7°F cooler than August and 11.8°F warmer than October. September is the 4th warmest month of the year in Hartford and the 2nd wettest. Across the month the normal high falls 11°F, from 81°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 67°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 59°F | 30% | 18% |
| September 8 | 79°F | 57°F | 30% | 18% |
| September 15 | 76°F | 54°F | 30% | 19% |
| September 22 | 73°F | 51°F | 31% | 20% |
| September 30 | 70°F | 48°F | 33% | 21% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 81°F | 59°F | 30% | 18% | 13 h 10 min |
| September 2 | 80°F | 59°F | 30% | 18% | 13 h 10 min |
| September 3 | 80°F | 58°F | 30% | 18% | 13 h 10 min |
| September 4 | 80°F | 58°F | 30% | 18% | 13 h |
| September 5 | 80°F | 58°F | 30% | 18% | 13 h |
| September 6 | 79°F | 57°F | 30% | 18% | 13 h |
| September 7 | 79°F | 57°F | 30% | 18% | 13 h |
| September 8 | 79°F | 57°F | 30% | 18% | 12 h 50 min |
| September 9 | 78°F | 56°F | 30% | 18% | 12 h 50 min |
| September 10 | 78°F | 56°F | 30% | 18% | 12 h 50 min |
| September 11 | 78°F | 56°F | 30% | 19% | 12 h 40 min |
| September 12 | 77°F | 55°F | 30% | 19% | 12 h 40 min |
| September 13 | 77°F | 55°F | 30% | 19% | 12 h 40 min |
| September 14 | 77°F | 55°F | 30% | 19% | 12 h 40 min |
| September 15 | 76°F | 54°F | 30% | 19% | 12 h 30 min |
| September 16 | 76°F | 54°F | 30% | 19% | 12 h 30 min |
| September 17 | 75°F | 53°F | 30% | 19% | 12 h 30 min |
| September 18 | 75°F | 53°F | 31% | 19% | 12 h 20 min |
| September 19 | 75°F | 53°F | 31% | 19% | 12 h 20 min |
| September 20 | 74°F | 52°F | 31% | 20% | 12 h 20 min |
| September 21 | 74°F | 52°F | 31% | 20% | 12 h 20 min |
| September 22 | 73°F | 51°F | 31% | 20% | 12 h 10 min |
| September 23 | 73°F | 51°F | 32% | 20% | 12 h 10 min |
| September 24 | 73°F | 51°F | 32% | 20% | 12 h 10 min |
| September 25 | 72°F | 50°F | 32% | 21% | 12 h 10 min |
| September 26 | 72°F | 50°F | 32% | 21% | 12 h |
| September 27 | 71°F | 49°F | 33% | 21% | 12 h |
| September 28 | 71°F | 49°F | 33% | 21% | 12 h |
| September 29 | 70°F | 49°F | 33% | 21% | 11 h 50 min |
| September 30 | 70°F | 48°F | 33% | 21% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 4.39 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 24
- Days at 80°F or more
- 10
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014740; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hartford in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 30 (33%). In all, 4.39 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Hartford, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014740.
How humid and windy is Hartford in September?
At 3 p.m. the normal temperature is 68°F with 52% relative humidity and a dew point of 50°F; at 6 a.m. it is 52°F with 89% humidity. The wind averages 6.6 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 52°F | 49°F | 89% | 5.0 mph | 43% |
| 9 a.m. | 59°F | 51°F | 74% | 6.9 mph | 40% |
| noon | 66°F | 50°F | 56% | 8.9 mph | 34% |
| 3 p.m. | 68°F | 50°F | 52% | 9.6 mph | 36% |
| 6 p.m. | 62°F | 51°F | 67% | 7.0 mph | 45% |
| 9 p.m. | 57°F | 51°F | 80% | 5.7 mph | 54% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014740. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Hartford?
The warmest September temperature on Hartford's official record (since 1905) is 101°F, on September 2, 1953; the coldest is 30°F, on September 28, 1947. The wettest September brought 14.59 in (1938).
The September mean against the 1991-2020 normal of 64.8°F: 2021 66.1°F (+1.3), 2022 65.0°F (+0.3), 2023 66.8°F (+2.0), 2024 66.9°F (+2.1), 2025 65.7°F (+0.9), 2026 64.0°F (−0.8). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.1°F | +1.3°F | 6.81 in |
| 2022 | 65.0°F | +0.3°F | 6.08 in |
| 2023 | 66.8°F | +2.0°F | 12.18 in |
| 2024 | 66.9°F | +2.1°F | 0.65 in |
| 2025 | 65.7°F | +0.9°F | 3.40 in |
| 2026 | 64.0°F | −0.8°F | 5.58 in |
Source: records: ACIS, NWS threaded record BDLthr; recent months: ACIS, station USW00014740. Records and recent months use complete months only.
How does September in Hartford compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, September normal highs run from 69°F in Norfolk to 76°F in Hartford; Hartford's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.