New Haven, CT Weather
New Haven hourly forecast: next 24 hours
Today's high of 66°F (19°C) is about 8°F (4°C) below the typical September high of 74°F (24°C).
Current conditions in detail
New Haven weather tomorrow (Wednesday, September 16)
Tomorrow in New Haven looks overcast, with a high of 73° and an overnight low of 60°. Rain is unlikely (12% chance). Winds top out near 8 mph, and the UV index reaches 4 (moderate).
New Haven 14-day forecast
About the weather in New Haven
Cold is the baseline in New Haven, not the exception. Night-time lows sit at or below freezing in 4 months of the year, and the warmest month, July, still only averages 82°F (28°C) by day. January runs to 26°F (-4°C) after dark.
New Haven weather: quick facts
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 39°F (4°C)
- Decade extremes (2015-2024): 95°F (35°C) high · -8°F (-22°C) low
- Wettest month: December (11 rainy days) · Sunniest: July (11.5 h sun/day)
- Climate type: humid subtropical
- Annual swing: 24°C between the average warmest and coolest month · day to night: 8°C
- Snow: about 12 days a year
- Months with freezing average lows: 4
- Average humidity: 71%
Temperatures through the year
Precipitation concentrates in December - 5.1 inches (130 mm) on 11 days - and thins out by November. Warmth peaks in July: highs of 82°F (28°C), lows of 68°F (20°C). January is the coolest month, with highs of 39°F (4°C) and lows near 26°F (-4°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 95°F (35°C) and the lowest daily minimum -8°F (-22°C). Between the average July and the average January lie 24°C, a wider spread than roughly 78% of the cities we track.
Rain, sun and snow
Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June. Snow falls on roughly 12 days a year, mostly December through March.
Season by season
Spring (March through May)
Spring in New Haven stays on the cool side of mild, with daytime highs averaging 57°F (14°C) and nights around 41°F (5°C); rain falls on around 34 of the 90 days, plus about 3 snowy days.
Summer (June through August)
Summer in New Haven settles into easy warmth, with daytime highs averaging 80°F (26°C) and nights around 65°F (18°C); rain falls on around 34 of the 90 days. Daylight is generous - around 11.2 hours of sun a day.
Fall (September through November)
Fall in New Haven runs cool rather than cold, with daytime highs averaging 64°F (18°C) and nights around 50°F (10°C); expect showers on roughly 27 days across the season.
Winter (December through February)
Winter in New Haven runs cold, with daytime highs averaging 41°F (5°C) and nights around 28°F (-2°C); rain falls on around 31 of the 90 days, plus about 9 snowy days.
Average temperatures in New Haven by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 39° | 26° | 10 | 4.4 in | 6.2 h/day | 66% |
| February | 41° | 26° | 10 | 3.7 in | 6.9 h/day | 69% |
| March | 47° | 31° | 11 | 4.4 in | 8.3 h/day | 65% |
| April | 57° | 40° | 12 | 4.9 in | 8.7 h/day | 68% |
| May | 67° | 51° | 11 | 3.8 in | 10.0 h/day | 73% |
| June | 76° | 60° | 11 | 3.6 in | 11.2 h/day | 74% |
| July | 82° | 68° | 12 | 4.8 in | 11.5 h/day | 76% |
| August | 81° | 67° | 11 | 4.1 in | 10.9 h/day | 75% |
| September | 74° | 61° | 9 | 4.6 in | 9.2 h/day | 75% |
| October | 64° | 50° | 10 | 4.7 in | 7.8 h/day | 74% |
| November | 53° | 39° | 8 | 3.4 in | 6.9 h/day | 69% |
| December | 44° | 31° | 11 | 5.1 in | 5.7 h/day | 71% |