Best time to visit New Haven
Month-by-month weather averages for New Haven.
New Haven, Connecticut, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 3 °C / 37 °F | -2.1 °C / 28 °F | 107 mm / 4.2 in | neither best nor good |
| February | 3.5 °C / 38 °F | -2.2 °C / 28 °F | 110 mm / 4.3 in | neither best nor good |
| March | 6.8 °C / 44 °F | 1.2 °C / 34 °F | 124 mm / 4.9 in | neither best nor good |
| April | 11.8 °C / 53 °F | 6.1 °C / 43 °F | 119 mm / 4.7 in | neither best nor good |
| May | 17.1 °C / 63 °F | 11.4 °C / 53 °F | 104 mm / 4.1 in | good month |
| June | 22.4 °C / 72 °F | 16.8 °C / 62 °F | 101 mm / 4 in | good month |
| July | 26.3 °C / 79 °F | 21 °C / 70 °F | 96 mm / 3.8 in | good month |
| August | 25.6 °C / 78 °F | 20.4 °C / 69 °F | 97 mm / 3.8 in | good month |
| September | 22.4 °C / 72 °F | 17.2 °C / 63 °F | 107 mm / 4.2 in | good month |
| October | 17.1 °C / 63 °F | 12 °C / 54 °F | 136 mm / 5.4 in | good month |
| November | 11.1 °C / 52 °F | 5.9 °C / 43 °F | 102 mm / 4 in | neither best nor good |
| December | 6 °C / 43 °F | 1.3 °C / 34 °F | 152 mm / 6 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: good
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: good
- NNovember: neither
- DDecember: neither
- Good
- May–October
Why these months
May · good
In its favour: feels like (high) 16.1 °C / 61 °F, share of daylight that is sunny 70%, average daily high 17.1 °C / 63 °F, precipitation 104 mm / 4.1 in, average daily low 11.4 °C / 53 °F, days with heavy rain 3.8 days, wet days 11.8 days, relative humidity 75%.
June · good
In its favour: feels like (high) 23.3 °C / 74 °F, average daily high 22.4 °C / 72 °F, share of daylight that is sunny 75%, precipitation 101 mm / 4 in, days with heavy rain 3.3 days, average daily low 16.8 °C / 62 °F, wet days 10.3 days.
Against: relative humidity 77%.
July · good
In its favour: feels like (high) 28.8 °C / 84 °F, share of daylight that is sunny 80%, average daily high 26.3 °C / 79 °F, precipitation 96 mm / 3.8 in, days with heavy rain 3 days, wet days 10.6 days, average daily low 21 °C / 70 °F.
Against: relative humidity 77%.
August · good
In its favour: feels like (high) 27.5 °C / 82 °F, average daily high 25.6 °C / 78 °F, share of daylight that is sunny 82%, precipitation 97 mm / 3.8 in, wet days 9.2 days, days with heavy rain 3.1 days, average daily low 20.4 °C / 69 °F, relative humidity 75%.
September · good
In its favour: feels like (high) 22.8 °C / 73 °F, average daily high 22.4 °C / 72 °F, share of daylight that is sunny 75%, precipitation 107 mm / 4.2 in, wet days 8.7 days, average daily low 17.2 °C / 63 °F, days with heavy rain 3.5 days, relative humidity 74%.
October · good
In its favour: feels like (high) 15.1 °C / 59 °F, share of daylight that is sunny 71%, average daily high 17.1 °C / 63 °F, average daily low 12 °C / 54 °F, wet days 10.9 days, days with heavy rain 4.5 days, relative humidity 72%.
Against: precipitation 136 mm / 5.4 in.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: best
- JJune: good
- JJuly: neither
- AAugust: neither
- SSeptember: good
- OOctober: good
- NNovember: good
- DDecember: neither
- Best
- May
- Good
- April, June, September–November
Why these months
April · good
In its favour: average daily high 11.8 °C / 53 °F, precipitation 119 mm / 4.7 in, average daily low 6.1 °C / 43 °F, share of daylight that is sunny 71%, daylight per day 13.3 h, feels like (high) 8.9 °C / 48 °F, wet days 11.4 days, wind (daily max) 24 km/h / 15 mph.
Against: days with heavy rain 4.2 days.
May · best
In its favour: average daily high 17.1 °C / 63 °F, precipitation 104 mm / 4.1 in, feels like (high) 16.1 °C / 61 °F, average daily low 11.4 °C / 53 °F, share of daylight that is sunny 70%, daylight per day 14.5 h, wet days 11.8 days, days with heavy rain 3.8 days, wind (daily max) 21 km/h / 13 mph.
June · good
In its favour: average daily high 22.4 °C / 72 °F, precipitation 101 mm / 4 in, share of daylight that is sunny 75%, daylight per day 15.1 h, wet days 10.3 days, feels like (high) 23.3 °C / 74 °F, days with heavy rain 3.3 days, wind (daily max) 20 km/h / 12 mph, average daily low 16.8 °C / 62 °F.
September · good
In its favour: average daily high 22.4 °C / 72 °F, precipitation 107 mm / 4.2 in, wet days 8.7 days, share of daylight that is sunny 75%, daylight per day 12.5 h, feels like (high) 22.8 °C / 73 °F, days with heavy rain 3.5 days, wind (daily max) 21 km/h / 13 mph.
Against: average daily low 17.2 °C / 63 °F.
October · good
In its favour: average daily high 17.1 °C / 63 °F, feels like (high) 15.1 °C / 59 °F, average daily low 12 °C / 54 °F, share of daylight that is sunny 71%, wet days 10.9 days, daylight per day 11.1 h, wind (daily max) 24 km/h / 15 mph.
Against: precipitation 136 mm / 5.4 in, days with heavy rain 4.5 days.
November · good
In its favour: average daily high 11.1 °C / 52 °F, precipitation 102 mm / 4 in, wet days 9.2 days, average daily low 5.9 °C / 43 °F, share of daylight that is sunny 70%, days with heavy rain 3.5 days, feels like (high) 7.5 °C / 46 °F, wind (daily max) 26 km/h / 16 mph.
Against: daylight per day 9.9 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Mountain Creek, 132 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -1.8 °C | -1.3 °C | 2.5 °C | 8.9 °C | 16.1 °C | 23.3 °C | 28.8 °C | 27.5 °C | 22.8 °C | 15.1 °C | 7.5 °C | 1.6 °C |
| Days with heavy rain | 3.8 days | 4 days | 3.9 days | 4.2 days | 3.8 days | 3.3 days | 3 days | 3.1 days | 3.5 days | 4.5 days | 3.5 days | 5 days |
| Time rain usually falls | 5 am | 1 pm | 2 am | 1 pm | 3 am | 9 am | 10 am | 7 am | 11 am | 11 pm | 7 am | 7 am |
| Sunshine per day | 6.7 h | 7.4 h | 8.7 h | 9.5 h | 10.2 h | 11.3 h | 11.9 h | 11.3 h | 9.3 h | 7.8 h | 6.9 h | 5.9 h |
| Relative humidity | 68% | 68% | 66% | 69% | 75% | 77% | 77% | 75% | 74% | 72% | 68% | 70% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 8.6 µg/m³ | 9.5 µg/m³ | 8 µg/m³ | 9.1 µg/m³ | 9.6 µg/m³ | 14.4 µg/m³ | 12.6 µg/m³ | 10.8 µg/m³ | 8.2 µg/m³ | 7.7 µg/m³ | 6.9 µg/m³ | 8 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 16.5 µg/m³ | 16.8 µg/m³ | 14.2 µg/m³ | 14.7 µg/m³ | 17 µg/m³ | 23.9 µg/m³ | 19.1 µg/m³ | 17 µg/m³ | 13 µg/m³ | 13 µg/m³ | 12.9 µg/m³ | 14.3 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.