Climate averages 1991–2020
New Britain weather
in September.
A warm, wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in New Britain: daytime highs average 23.3°C and nights cool to about 14.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 97 mm of rain on roughly 9 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Hartford (14 km away). In September its highs average 23.4°C, about as warm as New Britain, with 97 mm of rain.
Among the 498 cities listed in the United States, New Britain ranks joint 389th of 498 for the warmest September highs and joint 379th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; New Britain is 3.6°C cooler than that mean.
From September to October, average highs fall by 6.8°C to 16.5°C, and monthly rainfall rises from 97 mm to 103 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
New Britain climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.0°C-6.6°C | -6.6°C | 84 | 9.3 | 9.510 h |
| February | 3.5°C-5.8°C | -5.8°C | 76 | 8.7 | 10.611 h |
| March | 7.9°C-1.9°C | -1.9°C | 103 | 10.5 | 11.912 h |
| April | 14.6°C4.0°C | 4.0°C | 91 | 10.8 | 13.313 h |
| May | 20.2°C9.8°C | 9.8°C | 84 | 10.9 | 14.515 h |
| June | 25.2°C15.2°C | 15.2°C | 96 | 11.5 | 15.115 h |
| July | 28.5°C18.5°C | 18.5°C | 89 | 10.6 | 14.915 h |
| August | 27.5°C17.9°C | 17.9°C | 100 | 10.1 | 13.914 h |
| September, selected | 23.3°C14.1°C | 14.1°C | 97 | 8.5 | 12.513 h |
| October | 16.5°C7.9°C | 7.9°C | 103 | 9.2 | 11.111 h |
| November | 10.2°C2.3°C | 2.3°C | 84 | 8.5 | 9.910 h |
| December | 4.6°C-2.8°C | -2.8°C | 104 | 10.0 | 9.29 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Hartford in SeptemberUnited States · 14 kmHigh 23.4°C · Low 13.9°C · 97 mm rain
- Waterbury in SeptemberUnited States · 25 kmHigh 23.2°C · Low 14.6°C · 101 mm rain
- New Haven in SeptemberUnited States · 41 kmHigh 22.6°C · Low 16.2°C · 109 mm rain
- Springfield (Massachusetts), United States in SeptemberUnited States · 51 kmHigh 22.8°C · Low 13.7°C · 96 mm rain
- Danbury in SeptemberUnited States · 63 kmHigh 23.0°C · Low 14.6°C · 108 mm rain
- Bridgeport in SeptemberUnited States · 64 kmHigh 22.8°C · Low 16.4°C · 103 mm rain
- Norwalk in SeptemberUnited States · 80 kmHigh 23.1°C · Low 16.4°C · 94 mm rain
- Stamford in SeptemberUnited States · 93 kmHigh 23.2°C · Low 16.4°C · 94 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for New Britain) is explained once on the New Britain year overview and on the Sources, method and limits page.
Hartford lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.