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Old Mystic, Connecticut Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Old Mystic weather forecast — hour by hour, 7-day outlook, NOAA radar

Old Mystic, CT
Saturday, July 4 at 8:27 AM
85
°
Clear
Feels like
90°
Humidity
59%
Wind
7 mph
Sunrise
1:20 AM
Sunset
4:24 PM
Old Mystic, CT
Hour by hour · 24h
24-Hour ForecastOld Mystic, CT: 24-hour forecast. Temperatures range from 72 to 96 degrees Fahrenheit with a 33% chance of precipitation at 10 PM.
L 72°H 96°
Old Mystic, CT
7-day forecast
  1. Today
    Jul 4
    Heavy Rain
    33%
    0.78″
    96°74°—
  2. Sunday
    Jul 5
    Rain
    42%
    0.22″
    80°70°-16°
  3. Monday
    Jul 6
    Showers
    72%
    3.1″
    68°62°-12°
  4. Tuesday
    Jul 7
    Light Showers
    72%
    1.6″
    62°57°-6°
  5. Wednesday
    Jul 8
    Overcast
    12%
    —
    82°56°+20°
  6. Thursday
    Jul 9
    Clear
    11%
    —
    82°64°0°
  7. Friday
    Jul 10
    Light Drizzle
    29%
    —
    84°68°+2°
Old Mystic, CT
Next 24 hours · Warm now
HOT 90°65°85°105°6a12p6p12anow 85°high 96°low 72°PRECIP %
Old Mystic, CT
Anemometer · 24h winds · from true
NESW
From · True
WNW
291° · veering 25°
Direction
WNW
291°
Sustained
7
mph
Gust
11
mph
Peak 24h
20
avg 6
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 6 · pk 20 @ 7:00a
0102030MPHB1B2B3B4B5B6B7-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 292SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 25° from the wnw.
Old Mystic, CT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1004.5
-0.1 mb in 3h · steady · 29.66 inHg
Now
1004.5
mb
3h
-0.1
mb
12h
+0.3
mb
24h
-2.8
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1004–1007
1000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1007.21004.11004.4
−24h−18h−12h−6hnow
Damp, unsettled regime — wet weather lingers nearby.
Old Mystic, CT
Air quality
52
AQI
Moderate
↓-27 in 6h▲Peak ~65 @ 6 PM

AQI 52 (Moderate), driven by PM2.5. AQI down 27 over the last 6 hours — air quality is improving sharply. PM2.5 at 9.3 µg/m³, PM10 at 10.0 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 during the projected peak around 6 PM.

PM 2.5DRIVERGood
9.3μg/m³
PM 10Good
10μg/m³
NO₂Good
5μg/m³
OzoneModerate
85μg/m³
UV IndexLow
1.7

What's driving it

Ozone × UV × Sky

Ozone at AQI 40 now. With UV 5.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 21 around 1 PM.

Present
AQI 40
UV peak
5.7 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 21

PM × Wind × Precip

PM2.5 at 9.3 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.93
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 TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³450
Old Mystic, CT
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
60.3mi
UNLIMITED
105 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
12:27 UTC · Old Mystic, 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
12:27 UTC · Old Mystic, CT · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Old Mystic, CT
Satellite · infrared · animated
Old Mystic, CT
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Old Mystic, CT
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:47 AM
Sunrise
1:20 AM
Daylight
15h 04m
Sunset
4:24 PM
Civil dusk
8:59 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Old Mystic, CT
The moon
Waning Gibbous
82% illuminated
Moonrise
10:44 PM
Moonset
9:49 AM
In sign
♓︎ Pisces
Old Mystic, CT
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Old Mystic at a glance

  • Today vs. normal: 15°F above the seasonal normal for this latitude
  • Last frost: April 24 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Old Mystic

  1. Sat96°74°33%
  2. Sun80°70°42%
  3. Mon68°62°72%
  4. Tue62°57°72%
  5. Wed82°56°12%
  6. Thu82°64°11%
  7. Fri84°68°29%
  8. Sat74°65°24%
  9. Sun76°61°22%
  10. Mon66°63°18%
  11. Tue71°62°18%
  12. Wed81°59°27%
  13. Thu88°67°30%
  14. Fri90°71°31%
  15. Sat85°70°35%
  16. Sun83°64°40%

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

Right now in the garden

Peak growing season

As of July 4, 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 — Old Mystic

SPC includes Old Mystic in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

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.

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 · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 of 365 · Wedge 37 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

Old Mystic peaks at about 74°F in July and bottoms near 30°F in January; March brings the heaviest rain (5.1 inches) and July the least (3.6 inches).

MonthMean tempPrecipRainy days
January30°3.9″7
February32°3.8″6
March39°5.1″7
April49°4.7″7
May59°3.6″7
June68°4.3″6
July74°3.6″6
August73°4.4″6
September65°4.8″6
October54°4.9″6
November44°4.2″6
December35°5.0″7

Regional context

Old Mystic swings from 30°F in January to 74°F in July (45°F) per NOAA NCEI 1991-2020 normals; precipitation in Old Mystic runs about 52.2 inches on roughly 78 measurable days.

Old Mystic's precipitation spreads evenly: March peaks at 5.1 inches on 7.2 wet days, while July holds 3.6 inches over 5.6 — no month dominates Old Mystic's rain calendar. That lines Old Mystic up with places like Mystic, CT, Noank, CT and Poquonock Bridge, CT, fed by overlapping storm tracks.

Once Old Mystic passes mid-April, overnight freezes fade and kale, peas, spinach, and parsnips can be sown. Old Mystic's heat-lovers — tomatoes, peppers, squash — hold off until Old Mystic's frost risk clears, 10-14 days on. The season ends by mid-November in Old Mystic, once hard frosts set back in. Old Mystic's low ground holds frost later into spring than Old Mystic's benches, which run 3-5 days ahead.

Similar climates: Mystic, CT, Noank, CT, Poquonock Bridge, CT, Long Hill, CT, Conning Towers Nautilus Park, CT.

Frequently asked

When does it freeze in Old Mystic?
Frost typically leaves Old Mystic by mid-April and returns to Old Mystic near mid-November.
What is the rainy season in Old Mystic?
March is the wettest month in Old Mystic, about 5.1 inches on average; the year totals roughly 52 inches.
What is the warmest month in Old Mystic?
Old Mystic peaks in July, when the mean runs near 74°F.
What is the coldest month in Old Mystic?
January is Old Mystic's coldest month, averaging about 30°F.
When can I start a vegetable garden in Old Mystic?
Around mid-April, start frost-hardy crops in Old Mystic; tomatoes and basil belong a fortnight later.
How many rainy days does Old Mystic get?
Old Mystic records around 78 days of measurable precipitation annually.
What hardiness zone is Old Mystic?
With January around 30°F, Old Mystic's zone reflects that minimum — the USDA ZIP map confirms Old Mystic's band.
What is the 10-day forecast for Old Mystic?
Old Mystic'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 Old Mystic?
See this week's day-by-day rain chances for Old Mystic in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Old Mystic?
Current conditions for Old Mystic and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Old Mystic forecast updated?
The Old Mystic forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Old Mystic?
Today's sunrise and sunset times for Old Mystic 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 Old Mystic?
The next few days in Old Mystic'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, Old Mystic, Connecticut swings from 30°F in the heart of winter to 74°F at midsummer — a 44°F arc.

In a typical year Old Mystic records about 52 inches of precipitation on around 78 days.

Old Mystic's 44°F range, set by its 41.4°N position, drives frost timing and what thrives in Old Mystic.

All cities in Connecticut →

Norwich, CT weather →

ZIP codes in Old Mystic

  • 06355
  • 06372

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.