TidePlanet

Weather in Merrimac

14-day forecast · updated today, Wednesday, October 28, at 10:47 pm (EDT)
Now · clear 42 °F
Feels like
36 °F
Low / high
31 / 54 °F
Rain
1%
Wind
5 mph SW
→ 30.35 inHg · steady

Today in Merrimac: overcast, 31 °F to 54 °F, with a 1% chance of rain and a light breeze from the southwest (5 mph). Tomorrow, mainly clear, 41 °F to 67 °F and a 4% chance of rain. The warmest day of the week is Thursday 29, at 67 °F. Next likely rain: Wednesday 4 (19%).

Temperatures for the next 14 days

Day by day

Day Sky Low / high Rain Max wind Max wave High tides Model
Today · 28 Overcast 31 / 54 °F 1% 6 mph N 2.2 ft 2:24 am · 2:42 pm HRRR
Thu 29 Mainly clear 41 / 67 °F 4% 14 mph SW 1.3 ft 3:14 am · 3:32 pm HRRR + NBM
Fri 30 Overcast 45 / 66 °F 20% 10 mph W 1.7 ft 4:06 am · 4:26 pm NBM
Sat 31 Mainly clear 34 / 55 °F 0% 7 mph NW 2.2 ft 5:02 am · 5:23 pm NBM
Sun 1 Mainly clear 28 / 59 °F 0% 4 mph WSW 0.9 ft 5:00 am · 5:22 pm NBM
Mon 2 Overcast 37 / 65 °F 7% 4 mph WSW 0.9 ft 6:00 am · 6:22 pm NBM
Tue 3 Overcast 42 / 61 °F 15% · 0.03 in 4 mph ENE 1.2 ft 7:00 am · 7:24 pm NBM
Wed 4 Overcast 41 / 62 °F 19% · 0.18 in 5 mph S 1.6 ft 8:01 am · 8:25 pm NBM
Thu 5 Partly cloudy 43 / 62 °F 29% · 0.28 in 6 mph E 1.0 ft 8:58 am · 9:22 pm NBM
Fri 6 Light drizzle 47 / 61 °F 44% · 0.61 in 7 mph SE 2.4 ft 9:49 am · 10:14 pm NBM
Sat 7 Rain 42 / 58 °F 33% · 0.17 in 6 mph NNW 4.6 ft 10:35 am · 11:01 pm NBM
Sun 8 Light drizzle 37 / 56 °F 23% · 0.10 in 8 mph NW 4.1 ft 11:17 am · 11:45 pm NBM + ECMWF
Mon 9 Clear sky 34 / 56 °F 18% 6 mph NW 1.5 ft 11:58 am ECMWF
Tue 10 Partly cloudy 36 / 52 °F 14% 7 mph NE 1.8 ft 12:27 am · 12:39 pm ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 5:00 pm; then NBM until Sunday 8 2:00 pm; then ECMWF until Thursday 12 10:00 am; then GFS.

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time 12:00 am3:00 am6:00 am9:00 am12:00 pm3:00 pm6:00 pm9:00 pm
Sky ClearClearClearPartly cloudyOvercastPartly cloudyPartly cloudyClear
Temperature 35°33°31°38°51°54°48°43°
Chance of rain 0%0%0%0%1%1%1%1%
Rain 0.00 in0.00 in0.00 in0.00 in0.00 in0.00 in0.00 in0.00 in
Wind (mph) 4 NW4 NNW5 NNW5 N3 ESE3 SSW4 ESE4 SSW
Humidity 63%69%70%66%54%53%64%84%
UV 00013100
Model HRRRHRRRHRRRHRRRHRRRHRRRHRRRHRRR

Do the models agree?

High confidence

The models agree for the next few days: the forecast is fairly solid.

What 6 forecast models say for the next few days. The closer they are, the more reliable the forecast.

Do the models agree? · High
High (°F) TodayThu 29Fri 30Sat 31Sun 1Mon 2Tue 3
ECMWF 54°67°65°51°57°68°69°
AIFS 52°67°65°52°57°68°72°
GFS 54°68°68°54°57°62°54°
ICON 53°70°67°52°62°72°56°
HRRR 54°67°—————
NBM 55°68°66°55°59°65°61°
Confidence highhighhighhighhighmediumlow
Do the models agree? · Rain
Rain TodayThu 29Fri 30Sat 31Sun 1Mon 2Tue 3
ECMWF 0000000
AIFS 000.02 in0000
GFS 000.03 in0000
ICON 000.01 in0000
HRRR 00—————
NBM 0000000.02 in
Confidence highhighhighhighhighhighhigh
Do the models agree? · Wind
Wind (mph) TodayThu 29Fri 30Sat 31Sun 1Mon 2Tue 3
ECMWF 81313281228132871911221020
AIFS 91213117913
GFS 6161331153011265169271020
ICON 399231331102671810241025
HRRR 6141424—————
NBM 378191021715411411412
Confidence highhighhighhighhighhighhigh

Chance of rain from the ensemble models

Model TodayThu 29Fri 30Sat 31Sun 1Mon 2Tue 3
ECMWF (51 scenarios) 0%0%20%0%0%2%13%
GFS (GEFS, 31 scenarios) 0%0%35%0%0%15%23%
NBM (NOAA) 1%4%20%0%0%7%15%
Thunderstorm (NBM) 0%0%2%0%0%0%1%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: warmer and normal rain.

Next 6 weeks

When TemperatureTemp. Rain Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8 Well above +5.9 °F A bit above +28% —
Nov 9 – Nov 15Nov 9–Nov 15 A bit above +1.3 °F Normal 51° / 39°
Nov 16 – Nov 22Nov 16–Nov 22 A bit above +2.3 °F Normal 49° / 38°
Nov 23 – Nov 29Nov 23–Nov 29 Above +2.7 °F A bit above +27% 46° / 37°
Nov 30 – Dec 6Nov 30–Dec 6 A bit above +2.2 °F A bit above +28% 44° / 35°

Coming months

When TemperatureTemp. Rain
November A bit above +1.3 °F Normal
December Above +3.4 °F A bit above +28%
January Above +4.7 °F A bit above +47%
February Above +3.4 °F A bit above +34%
March Above +3.6 °F A bit above +23%

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Merrimac climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Merrimac is from June to September: highs of 73 °F to 82 °F, about 9 rainy days a month and 7 hours of sunshine a day.

Hurricane season: from July to September, peaking in July. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of Merrimac, about one every 10 years. The most recent: Elsa, in July 2021.

Month High Low Rain Rainy daysDays Sun (h/day) Water Waves Cyclones
JanuaryJan 35° 17° 3.47 in 8 3.5 42° 3.6 ft –
FebruaryFeb 37° 18° 3.03 in 7 4.9 40° 3.5 ft –
MarchMar 45° 26° 3.96 in 9 5.4 39° 3.7 ft –
AprilApr 57° 35° 4.07 in 8 6.3 42° 3.3 ft –
MayMay 68° 45° 3.29 in 9 6.4 49° 2.7 ft –
JuneJun 76° 54° 3.52 in 11 7.0 57° 2.3 ft –
JulyJul 82° 60° 3.39 in 10 7.6 63° 2.0 ft 2
AugustAug 81° 59° 3.20 in 9 7.3 65° 2.1 ft 1
SeptemberSep 73° 51° 3.53 in 8 6.0 62° 2.9 ft 1
OctoberOct 62° 40° 4.40 in 8 4.2 56° 3.4 ft –
NovemberNov 50° 32° 3.83 in 8 3.3 50° 3.4 ft –
DecemberDec 40° 23° 4.02 in 9 2.9 46° 3.5 ft –
Month Water Waves Cyclones
Jan 42° 3.6 ft –
Feb 40° 3.5 ft –
Mar 39° 3.7 ft –
Apr 42° 3.3 ft –
May 49° 2.7 ft –
Jun 57° 2.3 ft –
Jul 63° 2.0 ft 2
Aug 65° 2.1 ft 1
Sep 62° 2.9 ft 1
Oct 56° 3.4 ft –
Nov 50° 3.4 ft –
Dec 46° 3.5 ft –

Days: rainy days in the month. Sun: hours a day.

A normal year brings 43.72 in of rain on about 104 days and about 2,000 hours of sunshine.

Cyclones: how many tropical cyclones (tropical storms, hurricanes and typhoons) passed within 93 mi in each month from 1996 to 2025, according to IBTrACS (NOAA).

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now42 °Ffeels like 36 °F
Tomorrow41 / 67 °F

It's 42 °F now (feels like 36 °F). Today, 31 °F to 54 °F; tomorrow, 41 °F to 67 °F.

Chance of rain

  • Today 1%
  • Thu 29 4%
  • Fri 30 20%
  • Sat 31 0%
  • Sun 1 0%
  • Mon 2 7%
  • Tue 3 15% 0.03 in

Today the chance of rain reaches 1%. The next day with likely rain is Wednesday 4: 19% and 0.18 in.

No rain in the last 7 days.

Humidity and dew point

Humidity81%
Dew point36 °F

Humidity is 81% now and the dew point is 36 °F.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now11 migood
Clouds3%

Visibility is good now (11 mi). No fog expected today.

UV index

Now0
Today's peak3low

Thu 29: 3 · Fri 30: 3 · Sat 31: 3

IndexLevelWhat to do
0–2lowNo special protection needed.
3–5moderateHat, sunglasses and sunscreen around midday.
6–7highSunscreen, hat and shade between 12 and 4 pm.
8–10very highAvoid the midday sun; reflection off the water adds to it.
11+extremeAvoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

  • ↗ Rising Anglers say fish bite less for a while
  • → Steady · now Anglers expect normal activity
  • ↘ Falling Anglers say fish feed more before the change

Steady now (−0.02 inHg in 3 hours). Over the next 48 hours: −0.20 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 26
Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

DaySkyLow / highRainMax wind
Tue 27 Partly cloudy39 / 55 °F09 mph NNW
Mon 26 Partly cloudy38 / 69 °F09 mph W
Sun 25 Clear sky33 / 65 °F07 mph WSW
Sat 24 Mainly clear31 / 59 °F05 mph WNW
Fri 23 Clear sky39 / 56 °F010 mph N
Thu 22 Overcast44 / 63 °F011 mph N
Wed 21 Overcast42 / 56 °F011 mph NNE
Show all 30 days
DaySkyLow / highRainMax wind
Tue 20 Mainly clear37 / 65 °F011 mph NNE
Mon 19 Clear sky35 / 60 °F05 mph SSE
Sun 18 Clear sky32 / 55 °F06 mph WSW
Sat 17 Overcast39 / 59 °F014 mph NW
Fri 16 Light rain44 / 68 °F0.41 in12 mph SSW
Thu 15 Partly cloudy46 / 62 °F012 mph NW
Wed 14 Light drizzle52 / 75 °F0.05 in11 mph WNW
Tue 13 Light rain51 / 57 °F0.38 in13 mph E
Mon 12 Rain48 / 69 °F0.65 in9 mph NNW
Sun 11 Rain41 / 55 °F0.65 in7 mph ESE
Sat 10 Overcast47 / 62 °F09 mph NW
Fri 9 Mainly clear50 / 66 °F014 mph W
Thu 8 Light drizzle53 / 71 °F0.02 in12 mph WSW
Wed 7 Partly cloudy40 / 64 °F011 mph SSW
Tue 6 Mainly clear46 / 60 °F012 mph WNW
Mon 5 Overcast52 / 69 °F014 mph WNW
Sun 4 Light drizzle47 / 63 °F0.02 in8 mph ENE
Sat 3 Overcast52 / 69 °F08 mph N
Fri 2 Light drizzle66 / 84 °F0.04 in12 mph WSW
Thu 1 Overcast57 / 74 °F010 mph SW
Wed 30 Light drizzle58 / 68 °F0.04 in6 mph SW
Tue 29 Light drizzle55 / 66 °F0.04 in8 mph NNW
Mon 28 Light rain55 / 56 °F0.76 in16 mph NE

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in MerrimacQuestions

What's the weather like today in Merrimac?

Overcast, from 31 °F to 54 °F, with a light breeze from the southwest (5 mph) and a 1% chance of rain.

Will it rain tomorrow in Merrimac?

On Thursday 29 the chance of rain is 4% (0.00 in): mainly clear.

How warm will it be this week?

Between a low of 28 °F and a high of 67 °F; the warmest day, Thursday 29.

What's the UV index today?

It reaches 3 (low). No special protection needed.

Is the pressure rising or falling?

It's 30.35 inHg and steady: −0.08 inHg over the last 24 hours.

When is the best time to visit Merrimac?

The best time to visit Merrimac is from June to September: highs of 73 °F to 82 °F, about 9 rainy days a month and 7 hours of sunshine a day.

What is the weather like in Merrimac in October?

In October, Merrimac normally sees highs of 62 °F and lows of 40 °F, with about 8 rainy days (4.40 in for the month) and 4 hours of sunshine a day. The sea is around 56 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Merrimac?

The warmest is July, with average highs of 82 °F, and the coldest January, with lows of 17 °F. The wettest is October (4.40 in) and the driest, February.

When is hurricane season in Merrimac?

Hurricane season: from July to September, peaking in July. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of Merrimac, about one every 10 years. The most recent: Elsa, in July 2021.

More about Merrimac today

Weather near Merrimac

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 5.6 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 10:47 pm (local time).

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