Nantucket Harbor at Nantucket (IN MLLW)
6.6 mi- Level
- 3.3 ft
Forecast peak 4.0 ft Sat 11 AM, action stage
Reading from Sat 7:36 AM · NWS gauge page
Observed 8:55 AM EDT at KACK
Siasconset, MA weather
Sunny and 52°11°.
Today: low 41°5° (likely 41°5° to 51°11°), high 55°13° (likely 53°12° to 55°13°).
Now 52°11°
Sunny
- Wind
- 12 mph19 km/hgusts 17 mph28 km/h
- From the north-northwest. Up to 12 mph19 km/h through 9 PM
- Dew point
- 41°5°
- Comfortable
- UV index
- 1Low
- Moderate 12–3 PM · peak 3
- Pressure
- 30.51 inHg1033 hPa
- Rising slowly · +0.04 inHg+1.2 hPa in 3 h
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
2°1° cooler than this time yesterday (50°10° then, 48°9° now)
Good hours for
This morningUp to 52°11° by 11 AM · Clear
This afternoonNear 52°11° · Clear
TonightDown to 44°7° by 4 AM · Clear
Tomorrow morningUp to 60°16° by 11 AM · Clear
Tomorrow afternoonDown to 57°14° by 5 PM · Clear
Tomorrow nightDown to 47°8° by 1 AM · Clear
Monday morningNear 52°11° · Clear
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 9a | Sunny | 46°8° (likely 46°8° to 51°11°) | 42°6° | 0% | 7 mph11 km/h from NW, gusts 12 mph19 km/h | 83% | 7% | 1 |
| Sat 10a | Sunny | 49°9° (likely 49°9° to 53°12°) | 47°8° | 0% | 5 mph8 km/h from W, gusts 14 mph23 km/h | 71% | 12% | 1 |
| Sat 11a | Mostly sunny | 52°11° (likely 51°11° to 54°12°) | 52°11° | 0% | 2 mph3 km/h from W, gusts 14 mph22 km/h | 61% | 20% | 2 |
| Sat 12p | Sunny | 53°12° (likely 52°11° to 55°13°) | 53°12° | 0% | 5 mph8 km/h from W, gusts 12 mph20 km/h | 59% | 15% | 3 |
| Sat 1p | Sunny | 54°12° (likely 52°11° to 55°13°) | 54°12° | 0% | 8 mph13 km/h from NW, gusts 11 mph18 km/h | 54% | 21% | 3 |
| Sat 2p | Sunny | 54°12° (likely 53°12° to 55°13°) | 54°12° | 0% | 10 mph16 km/h from N, gusts 10 mph16 km/h | 52% | 20% | 3 |
| Sat 3p | Sunny | 53°12° (likely 52°11° to 55°13°) | 53°12° | 0% | 9 mph14 km/h from N, gusts 9 mph14 km/h | 54% | 8% | 2 |
| Sat 4p | Sunny | 52°11° (likely 52°11° to 54°12°) | 52°11° | 0% | 8 mph13 km/h from NW, gusts 8 mph12 km/h | 56% | 8% | 1 |
| Sat 5p | Sunny | 51°11° (likely 51°11° to 53°12°) | 51°11° | 0% | 7 mph11 km/h from NW, gusts 7 mph11 km/h | 61% | 11% | 0 |
| Sat 6p | Clear | 49°9° (likely 48°9° to 52°11°) | 47°8° | 0% | 6 mph10 km/h from NW, gusts 6 mph10 km/h | 66% | 1% | 0 |
| Sat 7p | Clear | 47°8° (likely 46°8° to 52°11°) | 46°8° | 0% | 3 mph5 km/h from W, gusts 5 mph8 km/h | 71% | 0% | 0 |
| Sat 8p | Clear | 45°7° (likely 45°7° to 52°11°) | 45°7° | 0% | 2 mph3 km/h from W, gusts 5 mph7 km/h | 76% | 0% | 0 |
| Sat 9p | Clear | 45°7° (likely 44°7° to 52°11°) | 45°7° | 0% | 2 mph3 km/h from W, gusts 4 mph7 km/h | 79% | 0% | 0 |
| Sat 10p | Clear | 45°7° (likely 44°7° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from NW, gusts 4 mph6 km/h | 82% | 0% | 0 |
| Sat 11p | Clear | 45°7° (likely 44°7° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from NW, gusts 4 mph7 km/h | 82% | 0% | 0 |
| Sun 12a | Clear | 45°7° (likely 43°6° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from NW, gusts 4 mph6 km/h | 82% | 0% | 0 |
| Sun 1a | Clear | 45°7° (likely 43°6° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from W, gusts 4 mph6 km/h | 79% | 0% | 0 |
| Sun 2a | Clear | 45°7° (likely 43°6° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from W, gusts 3 mph5 km/h | 79% | 0% | 0 |
| Sun 3a | Clear | 45°7° (likely 43°6° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from W, gusts 3 mph4 km/h | 79% | 0% | 0 |
| Sun 4a | Clear | 44°7° (likely 44°7° to 53°12°) | 44°7° | 0% | 1 mph2 km/h from W, gusts 3 mph4 km/h | 86% | 0% | 0 |
| Sun 5a | Clear | 44°7° (likely 44°7° to 52°11°) | 44°7° | 0% | 1 mph2 km/h from W, gusts 4 mph6 km/h | 86% | 0% | 0 |
| Sun 6a | Clear | 45°7° (likely 44°7° to 52°11°) | 45°7° | 0% | 1 mph2 km/h from W, gusts 4 mph7 km/h | 86% | 6% | 0 |
| Sun 7a | Sunny | 46°8° (likely 44°7° to 51°11°) | 46°8° | 0% | 1 mph2 km/h from W, gusts 5 mph7 km/h | 83% | 13% | 0 |
| Sun 8a | Sunny | 48°9° (likely 45°7° to 52°11°) | 48°9° | 0% | 1 mph2 km/h from W, gusts 4 mph7 km/h | 80% | 19% | 0 |
| Sun 9a | Sunny | 52°11° (likely 47°8° to 53°12°) | 52°11° | 0% | 1 mph2 km/h from W, gusts 4 mph6 km/h | 66% | 20% | 1 |
| Sun 10a | Sunny | 56°13° (likely 50°10° to 56°13°) | 56°13° | 0% | 1 mph2 km/h from N, gusts 4 mph6 km/h | 55% | 20% | 2 |
| Sun 11a | Sunny | 60°16° (likely 50°10° to 60°16°) | 60°16° | 0% | 0 mph0 km/h, gusts 5 mph7 km/h | 46% | 20% | 3 |
| Sun 12p | Sunny | 62°17° (likely 50°10° to 62°17°) | 62°17° | 0% | 2 mph3 km/h from NW, gusts 5 mph8 km/h | 43% | 21% | 4 |
| Sun 1p | Sunny | 62°17° (likely 50°10° to 62°17°) | 62°17° | 0% | 6 mph10 km/h from SW, gusts 7 mph12 km/h | 44% | 21% | 4 |
| Sun 2p | Sunny | 62°17° (likely 50°10° to 62°17°) | 62°17° | 0% | 8 mph13 km/h from S, gusts 8 mph12 km/h | 44% | 20% | 4 |
| Sun 3p | Sunny | 60°16° (likely 50°10° to 60°16°) | 60°16° | 0% | 8 mph13 km/h from S, gusts 8 mph13 km/h | 49% | 20% | 3 |
| Sun 4p | Sunny | 59°15° (likely 50°10° to 59°15°) | 59°15° | 0% | 8 mph13 km/h from S, gusts 7 mph11 km/h | 51% | 20% | 2 |
| Sun 5p | Sunny | 57°14° (likely 49°9° to 57°14°) | 57°14° | 0% | 7 mph11 km/h from S, gusts 9 mph14 km/h | 57% | 20% | 1 |
| Sun 6p | Clear | 56°13° (likely 48°9° to 56°13°) | 56°13° | 0% | 7 mph11 km/h from S, gusts 10 mph16 km/h | 62% | 20% | 0 |
| Sun 7p | Clear | 54°12° (likely 47°8° to 54°12°) | 54°12° | 0% | 7 mph11 km/h from SW, gusts 10 mph16 km/h | 69% | 20% | 0 |
| Sun 8p | Clear | 53°12° (likely 47°8° to 53°12°) | 53°12° | 0% | 6 mph10 km/h from SW, gusts 10 mph15 km/h | 74% | 20% | 0 |
| Sun 9p | Clear | 53°12° (likely 47°8° to 53°12°) | 53°12° | 0% | 6 mph10 km/h from SW, gusts 10 mph15 km/h | 74% | 20% | 0 |
| Sun 10p | Clear | 52°11° (likely 47°8° to 52°11°) | 52°11° | 0% | 5 mph8 km/h from SW, gusts 10 mph16 km/h | 77% | 21% | 0 |
| Sun 11p | Clear | 51°11° (likely 47°8° to 51°11°) | 51°11° | 0% | 3 mph5 km/h from SW, gusts 10 mph17 km/h | 80% | 21% | 0 |
| Mon 12a | Clear | 49°9° (likely 47°8° to 52°11°) | 47°8° | 0% | 5 mph8 km/h from SW, gusts 10 mph16 km/h | 89% | 20% | 0 |
| Mon 1a | Clear | 47°8° (likely 47°8° to 53°12°) | 45°7° | 0% | 5 mph8 km/h from SW, gusts 10 mph16 km/h | 96% | 19% | 0 |
| Mon 2a | Clear | 47°8° (likely 46°8° to 53°12°) | 44°7° | 0% | 6 mph10 km/h from SW, gusts 10 mph16 km/h | 96% | 18% | 0 |
| Mon 3a | Clear | 49°9° (likely 49°9° to 55°13°) | 47°8° | 0% | 6 mph10 km/h from SW, gusts 11 mph17 km/h | 86% | 19% | 0 |
| Mon 4a | Clear | 51°11° (likely 50°10° to 55°13°) | 51°11° | 0% | 7 mph11 km/h from SW, gusts 11 mph18 km/h | 89% | 15% | 0 |
| Mon 5a | Clear | 53°12° (likely 52°11° to 55°13°) | 53°12° | 0% | 7 mph11 km/h from SW, gusts 12 mph19 km/h | 89% | 10% | 0 |
| Mon 6a | Clear | 52°11° (likely 52°11° to 56°13°) | 52°11° | 0% | 7 mph11 km/h from SW, gusts 12 mph19 km/h | 93% | 6% | 0 |
| Mon 7a | Sunny | 51°11° (likely 51°11° to 56°13°) | 51°11° | 0% | 7 mph11 km/h from SW, gusts 13 mph21 km/h | 100% | 3% | 0 |
| Mon 8a | Sunny | 51°11° (likely 51°11° to 57°14°) | 51°11° | 0% | 6 mph10 km/h from SW, gusts 14 mph22 km/h | 100% | 0% | 0 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Mostly sunny. High 55°13°, low 41°5°. Typical 60°16° / 46°8°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 52°11°Dry
Afternoon
noon–6 PM
Sunny, 54°12°Dry
Evening
6 PM–midnight
Clear, 45°7°Dry
Overnight
midnight–6 AM
Clear, 44°7°Dry
Official NWS forecast
Today: Sunny, with a high near 55. Northwest wind 2 to 10 mph.
Tonight: Clear, with a low around 41. Northwest wind 1 to 6 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 53°12°–55°13°
- Low, likely
- 41°5°–51°11°
- Typical high / low
- 60°16° / 46°8°
- Wind
- 14 mph23 km/h
- UV peak
- 4
Tomorrow, Oct 25. Sunny. High 62°17°, low 45°7°. Typical 59°15° / 46°8°. Dry. Forecasts differ.
Morning
6 AM–noon
Sunny, 48°9°Dry
Afternoon
noon–6 PM
Sunny, 62°17°Dry
Evening
6 PM–midnight
Clear, 53°12°Dry
Overnight
midnight–6 AM
Clear, 47°8°Dry
Official NWS forecast
Day: Sunny, with a high near 62. West wind 0 to 8 mph.
Night: Clear, with a low around 45. Southwest wind 3 to 7 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 54°12°–62°17°
- Low, likely
- 43°6°–51°11°
- Typical high / low
- 59°15° / 46°8°
- Wind
- 8 mph13 km/h, gusts 14 mph22 km/h
- UV peak
- 4
Monday, Oct 26. Sunny. High 63°17°, low 48°9°. Typical 59°15° / 46°8°. Dry. Mostly agree. Best day outdoors this week.
Morning
6 AM–noon
Sunny, 51°11°Dry
Afternoon
noon–6 PM
Sunny, 57°14°Dry
Evening
6 PM–midnight
Clear, 57°14°Dry
Overnight
midnight–6 AM
Mostly clear, 54°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 63. West wind 6 to 13 mph, with gusts as high as 24 mph.
Night: Mostly clear, with a low around 48. Northwest wind 9 to 17 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Best day outdoors this week: the one dry, mild day the forecasts agree on (high 63°17°).
- High, likely
- 56°13°–63°17°
- Low, likely
- 47°8°–53°12°
- Typical high / low
- 59°15° / 46°8°
- Wind
- 18 mph29 km/h
- UV peak
- 4
Tuesday, Oct 27. Mostly sunny. High 52°11°, low 45°7°. Typical 59°15° / 45°7°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 52°11°Dry
Afternoon
noon–6 PM
Sunny, 50°10°Dry
Evening
6 PM–midnight
Clear, 48°9°Dry
Overnight
midnight–6 AM
Clear, 49°9°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 52. North wind 14 to 18 mph.
Night: Mostly clear, with a low around 45. Northeast wind 7 to 13 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 52°11°–59°15°
- Low, likely
- 45°7°–49°9°
- Typical high / low
- 59°15° / 45°7°
- Wind
- 24 mph39 km/h, gusts 32 mph52 km/h
- UV peak
- 4
Wednesday, Oct 28. Mostly sunny. High 51°11°, low 47°8°. Typical 58°14° / 45°7°. Dry. Forecasts agree.
Morning
6 AM–noon
Sunny, 49°10°Dry
Afternoon
noon–6 PM
Sunny, 50°10°Dry
Evening
6 PM–midnight
Mostly clear, 50°10°Dry
Overnight
midnight–6 AM
Mostly clear, 50°10°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 51. Northeast wind around 7 mph.
Night: Partly cloudy, with a low around 47. Southeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 50°10°–52°11°
- Low, likely
- 47°8°–49°9°
- Typical high / low
- 58°14° / 45°7°
- Wind
- 13 mph22 km/h, gusts 19 mph31 km/h
- UV peak
- 4
Thursday, Oct 29. Mostly sunny. High 58°14°, low 53°12°. Typical 58°14° / 45°7°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 52°11°Dry
Afternoon
noon–6 PM
Sunny, 56°13°Dry
Evening
6 PM–midnight
Clear, 57°14°Dry
Overnight
midnight–6 AM
Mostly clear, 57°14°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58. South wind 3 to 12 mph.
Night: Mostly clear, with a low around 53. Southwest wind around 12 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 55°13°–59°15°
- Low, likely
- 49°9°–53°12°
- Typical high / low
- 58°14° / 45°7°
- Wind
- 20 mph32 km/h, gusts 26 mph42 km/h
- UV peak
- 4
Friday, Oct 30. Mostly sunny. High 58°14°, low 51°11°. Typical 58°14° / 44°7°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 57°14°Dry
Afternoon
noon–6 PM
Sunny, 58°14°Dry
Evening
6 PM–midnight
Clear, 57°14°Dry
Overnight
midnight–6 AM
Clear, 54°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 58. Southwest wind around 14 mph.
Night: Partly cloudy, with a low around 51. Northwest wind around 12 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 56°13°–60°16°
- Low, likely
- 51°11°–57°14°
- Typical high / low
- 58°14° / 44°7°
- Wind
- 20 mph33 km/h, gusts 32 mph52 km/h
- UV peak
- 3
Saturday, Oct 31. Mostly sunny. High 56°13°, low 53°12°. Typical 57°14° / 44°7°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 53°12°Dry
Afternoon
noon–6 PM
Partly sunny, 54°12°Dry
Evening
6 PM–midnight
Clear, 54°12°Dry
Overnight
midnight–6 AM
Partly cloudy, 54°12°Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 54°12°–59°15°
- Low, likely
- 49°9°–57°14°
- Typical high / low
- 57°14° / 44°7°
- Wind
- 29 mph47 km/h
- UV peak
- 3
Sunday, Nov 1. Cloudy. High 57°14°, low 54°12°. Typical 57°14° / 44°7°. Dry. Forecasts differ.
Morning
6 AM–noon
Sunny, 54°12°Dry
Afternoon
noon–6 PM
Sunny, 56°13°Dry
Evening
6 PM–midnight
Clear, 56°13°Dry
Overnight
midnight–6 AM
Mostly clear, 57°14°30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 51°11°–60°16°
- Low, likely
- 49°9°–57°14°
- Typical high / low
- 57°14° / 44°7°
- Wind
- 25 mph40 km/h
- UV peak
- 4
Monday, Nov 2. Cloudy. High 57°14°, low 55°13°. Typical 57°14° / 44°7°. Rain 0.05 in1.3 mm, 30% chance. Mostly agree.
Morning
6 AM–noon
Cloudy, 57°14°30% chance
Afternoon
noon–6 PM
Drizzle, 57°14°30% chance · 0.02 in0.4 mm
Evening
6 PM–midnight
Cloudy, 55°13°30% chance · 0.02 in0.5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 53°12°–59°15°
- Low, likely
- 51°11°–57°14°
- Typical high / low
- 57°14° / 44°7°
- Wind
- 24 mph38 km/h, gusts 32 mph51 km/h
- UV peak
- 2
The outlook
Today
Dry, high 55°, low 41°.
Tomorrow
Dry, high 62°, low 45°, warming up.
Monday
Dry, high 63°, low 48°.
Rest of week
Mostly dry, highs 51–58°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (BOX) (opens in a new tab)
What changed since yesterday
No meaningful changes from yesterday’s forecast.
Radar
Radar data: NOAA MRMS, rendered by forecast.blue
Radar loads when scrolled into view
Rivers
NOAA river gauges within 25 mi
Below flood stage
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 70% less heating than a typical week.
This week 27Typical 91
Heating degree days, base 65°F
Heat-pump hours, next 7 days
- h below 47°F
- 15
- h below 17°F
- 0
- h below 5°F
- 0
47, 17 and 5°F are the test points heat pumps are rated at.
Comfort
Dry air outside (dew point 41°F).
Open the windows?
Sun, 11:00 AM–3:00 PM
Good stretch to open the windows (air quality forecast not available for part of this window).
Is this typical?
Nantucket Memorial Airport · official normals 1991–2020 · records 1948–2026
Oct 24, today vs a typical year
Today’s expected high is 5°3° colder than typical.
- Normal high / low
- 60°16° / 46°8°
- Forecast high / low
- 55°13° / 41°5°
- Record high
- 76°24° in 2022
- Record low
- 28°−2° in 1977
Last 7 days vs normal
On average 3°1° colder than normal (daily mean temperature).
- −8°−4°SunOct 18
- −6°−3°MonOct 19
- +3°+2°TueOct 20
- +2°+1°WedOct 21
- +2°+1°ThuOct 22
- −8°−4°FriOct 23
- —SatOct 24
Siasconset weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:01 AM, sunset 5:45 PM.
- Daylight
- 10 h 44 min
- Losing 2 min 35 s a day; shortest Dec 21, 1 h 32 min less
- Golden hour
- 5:07–6:03 PM
- Morning 6:44–7:40 AM
- Blue hour
- 6:03–6:13 PM
- Morning 6:33–6:44 AM; first light 6:33 AM
Stars tonight? Fair
Clear 6:13 PM–6:34 AM, but the moon is 99% lit and up.
Moon
Waxing gibbous
97% lit · growing
- Today
- sets 5:11 AM · rises 4:42 PM
- Full moon
- Oct 26
- New moon
- Nov 9
