Weather StoryAlmanac, microseasons, and the day's weather story.

New Haven, Connecticut Weather

Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →

New Haven weather forecast — hour by hour, 7-day outlook, NOAA radar

New Haven, CT
Sunday, August 2 at 10:59 AM
78
°
Overcast
Feels like
86°
Humidity
86%
Wind
7 mph
Sunrise
1:48 AM
Sunset
4:07 PM
New Haven, CT
Hour by hour · 24h
24-Hour ForecastNew Haven, CT: 24-hour forecast. Temperatures range from 75 to 82 degrees Fahrenheit with a 56% chance of precipitation at 8 AM.
L 75°H 82°
New Haven, CT
7-day forecast
  1. Today
    Aug 2
    Overcast
    12%
    —
    82°73°—
  2. Monday
    Aug 3
    Showers
    56%
    1.1″
    80°71°-2°
  3. Tuesday
    Aug 4
    Overcast
    45%
    —
    79°64°-1°
  4. Wednesday
    Aug 5
    Heavy Showers
    15%
    0.76″
    78°68°-1°
  5. Thursday
    Aug 6
    Light Drizzle
    32%
    0.01″
    83°74°+5°
  6. Friday
    Aug 7
    Heavy Showers
    33%
    0.87″
    86°73°+3°
  7. Saturday
    Aug 8
    Light Drizzle
    27%
    —
    82°73°-4°
New Haven, CT
Next 24 hours · Mild now
72°79°85°12p6p12a6anow 76°high 82°low 75°PRECIP %
New Haven, CT
Anemometer · 24h winds · from true
NESW
From · True
SSE
160° · backing 11°
Direction
SSE
160°
Sustained
7
mph
Gust
16
mph
Peak 24h
21
avg 7 mph
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 mph · pk 21 mph @ 6:00p
010203040MPHB1B2B3B4B5B6B7B8-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 3311SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 11° from the sse.
New Haven, CT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1013.6
+0.4 mb in 3h · steady · 29.93 inHg
Now
1013.6
mb
3h
+0.4
mb
12h
+1.2
mb
24h
+0.9
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1012–1014
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1013.61011.71013.6
Air sits at the threshold — small shifts decide the day.
New Haven, CT
Air quality
50
AQI
Good
→-4 in 6h

AQI 50 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 11.0 µg/m³, PM10 at 15.1 µg/m³ — typical background levels with no transport signature.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
11.0μg/m³
PM 10Good
15μg/m³
NO₂Good
3μg/m³
OzoneModerate
96μg/m³
UV IndexModerate
2.9

What's driving it

Ozone × UV × Sky

Ozone at AQI 45. Overcast through the UV peak window (cloud cover ~79%) — afternoon ozone should stay flat.

Present
AQI 45
UV peak
4.1 at 1 PM
Sky at peak
overcast
Projected peak
AQI 12

PM × Wind × Precip

PM2.5 at 11.0 µg/m³, PM10 at 15.1 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.73
Wind
light
Recent rain
0h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³370
New Haven, CT
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
32.6mi
UNLIMITED
76 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:59 UTC · New Haven, CT · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:59 UTC · New Haven, CT · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
New Haven, CT
Satellite · infrared · animated
New Haven, CT
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
New Haven, CT
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:17 AM
Sunrise
1:48 AM
Daylight
14h 19m
Sunset
4:07 PM
Civil dusk
8:40 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
New Haven, CT
The moon
Waning Gibbous
84% illuminated
Moonrise
9:35 PM
Moonset
9:54 AM
In sign
♓︎ Pisces
New Haven, CT
Microseason
Aug 1–5

Night falls a minute earlier

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

New Haven at a glance

  • Today vs. normal: 17°F above the seasonal normal for this latitude
  • Last frost: April 24 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 06510, 06511, 06513, 06515, 06519

16-Day Forecast — New Haven

  1. Sun82°73°11%
  2. Mon80°71°56%
  3. Tue79°64°27%
  4. Wed78°68°17%
  5. Thu83°74°31%
  6. Fri86°73°43%
  7. Sat82°73°42%
  8. Sun90°76°27%
  9. Mon89°71°29%
  10. Tue81°70°17%
  11. Wed78°63°15%
  12. Thu74°69°41%
  13. Fri79°71°41%
  14. Sat76°70°39%
  15. Sun85°73°26%
  16. Mon82°69°23%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near New Haven

Right now in the garden

Peak growing season

As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — New Haven

SPC has placed New Haven in the Marginal Risk category for severe thunderstorms tomorrow.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

Sun & seasons in New Haven

New Haven sits in South Central Connecticut County, where the year’s longest day runs 15h 10m of daylight and its shortest just 9h 11m — a swing of +5h 58m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Hartford, the state’s largest city, lies about 34 miles to the NNE. The nearest town New Haven tracks is Bridgeport, roughly 16 miles to the WSW.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

Night falls a minute earlier

Sunset retreats perceptibly — daylight shortening speeds up.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

New Haven peaks at about 75°F in July and bottoms near 30°F in January; December brings the heaviest rain (4.7 inches) and February the least (3.3 inches).

MonthMean tempPrecipRainy days
January30°4.0″14
February32°3.3″14
March39°3.9″16
April50°4.3″18
May58°4.0″19
June68°3.9″18
July75°3.6″18
August74°4.0″17
September68°3.7″14
October58°3.7″13
November45°4.6″14
December35°4.7″14

Regional context

Per NOAA NCEI 1991-2020 normals, New Haven runs from a 30°F January mean to 75°F in July, a 45°F seasonal spread, with near 47.7 inches of precipitation across about 188 wet days.

No season owns New Haven's rain: December reaches 4.7 inches across 13.9 days and February keeps 3.3 inches on 13.5, an even spread through New Haven's year. That even rhythm groups New Haven with places like West Haven, CT, Branford Center, CT and Woodmont, CT.

Around mid-April, New Haven sheds its freezing nights — peas, lettuce, spinach, and radishes go into New Haven's beds. New Haven's heat-lovers — tomatoes, peppers, squash — hold off until New Haven's frost risk clears, 10-14 days on. Frost returns to New Haven near mid-November, ending the tender-crop season. New Haven's low ground holds frost later into spring than New Haven's benches, which run 3-5 days ahead.

Similar climates: West Haven, CT, Branford Center, CT, Woodmont, CT, Quinnipiac University, CT, Ansonia, CT.

Naturalist notes

Late May brings the arrival of ruby-throated hummingbirds to New Haven gardens and parks.

By mid-June, common milkweed begins its distinctive pink-purple bloom across Connecticut meadows.

Frequently asked

When does it freeze in New Haven?
In New Haven, expect the last spring frost near mid-April; New Haven's first autumn frost comes around mid-November.
What is the rainy season in New Haven?
December is the wettest month in New Haven, about 4.7 inches on average; the year totals roughly 48 inches.
What is the warmest month in New Haven?
On average July tops the year in New Haven at about 75°F.
What is the coldest month in New Haven?
The coldest stretch in New Haven falls in January, around 30°F on average.
When can I start a vegetable garden in New Haven?
In New Haven, sow peas and hardy greens around mid-April; New Haven's tomatoes and peppers wait two weeks more.
How many rainy days does New Haven get?
New Haven records around 188 days of measurable precipitation annually.
What hardiness zone is New Haven?
With January around 30°F, New Haven's zone reflects that minimum — the USDA ZIP map confirms New Haven's band.
What is the 10-day forecast for New Haven?
New Haven's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in New Haven?
See this week's day-by-day rain chances for New Haven in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in New Haven?
Current conditions for New Haven and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the New Haven forecast updated?
The New Haven forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in New Haven?
Today's sunrise and sunset times for New Haven are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for New Haven?
The next few days in New Haven's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer humid continental zone, New Haven, Connecticut swings from 30°F in the heart of winter to 75°F at midsummer — a 45°F arc.

New Haven sees close to 48 inches of precipitation annually, falling across some 188 wet days.

New Haven sits at 41.3°N; that 45°F seasonal swing frames planting windows and frost dates across New Haven.

All cities in Connecticut →

New York, NY weather →

ZIP codes in New Haven

  • 06519
  • 06511
  • 06510
  • 06513
  • 06512
  • 06515
  • 06501
  • 06502
  • 06503
  • 06505
  • 06506
  • 06507
  • 06508
  • 06509
  • 06520
  • 06521
  • 06530
  • 06531
  • 06532
  • 06533
  • 06534
  • 06535
  • 06536
  • 06540

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.