Weather in Grande-Synthe

14-day forecast · updated today, Thursday, October 29, at 6:40 am (CET)

Now · overcast 49 °F

Feels like: 47 °F
Low / high: 47 / 61 °F
Rain: 2% · 0.00 in
Wind: 4 mph S

→ 30.37 inHg · steady

Today in Grande-Synthe: overcast, 47 °F to 61 °F, with a 2% chance of rain (0.00 in) and a light breeze from the south (4 mph). Tomorrow, partly cloudy, 42 °F to 59 °F and a 0% chance of rain. The warmest day of the week is Thursday 29, at 61 °F. Next likely rain: Tuesday 3 (20%).

Temperatures for the next 14 days

61° 47°
Today
59° 42°
Fri 30
51° 44°
Sat 31
55° 46°
Sun 1
56° 51°
Mon 2
54° 49°
Tue 3
51° 44°
Wed 4
50° 40°
Thu 5
50° 39°
Fri 6
47° 36°
Sat 7
56° 43°
Sun 8
59° 50°
Mon 9
60° 52°
Tue 10
60° 52°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	47 / 61 °F	2% · 0.00 in	7 mph SSE	1.7 ft	2:21 am · 2:40 pm	AROME
Fri 30	Partly cloudy	42 / 59 °F	0%	11 mph E	1.6 ft	3:04 am · 3:24 pm	AROME
Sat 31	Overcast	44 / 51 °F	0%	9 mph E	1.5 ft	3:51 am · 4:13 pm	AROME + ICON-EU
Sun 1	Light rain	46 / 55 °F	9% · 0.00 in	6 mph ENE	3.5 ft	4:44 am · 5:12 pm	ICON-EU
Mon 2	Light rain	51 / 56 °F	27% · 0.04 in	13 mph NNE	6.6 ft	5:49 am · 6:31 pm	ICON-EU
Tue 3	Light drizzle	49 / 54 °F	20% · 0.06 in	15 mph ENE	6.4 ft	7:17 am · 8:24 pm	ICON-EU + ECMWF
Wed 4	Light drizzle	44 / 51 °F	4% · 0.01 in	10 mph E	4.6 ft	8:47 am · 9:41 pm	ECMWF
Thu 5	Clear sky	40 / 50 °F	4%	11 mph E	2.8 ft	9:54 am · 10:38 pm	ECMWF
Fri 6	Clear sky	39 / 50 °F	4%	11 mph E	2.8 ft	10:48 am · 11:24 pm	ECMWF
Sat 7	Overcast	36 / 47 °F	4%	8 mph ESE	3.1 ft	11:33 am	ECMWF
Sun 8	Drizzle	43 / 56 °F	15% · 0.22 in	7 mph SSE	1.3 ft	12:03 am · 12:13 pm	ECMWF
Mon 9	Drizzle	50 / 59 °F	22% · 0.26 in	11 mph SSE	1.6 ft	12:37 am · 12:48 pm	ECMWF
Tue 10	Drizzle	52 / 60 °F	22% · 0.34 in	14 mph SSW	4.5 ft	1:06 am · 1:19 pm	ECMWF
Wed 11	Heavy drizzle	52 / 60 °F	24% · 0.43 in	18 mph SSW	4.7 ft	1:33 am · 1:50 pm	ECMWF

Each hour comes from the best model for this spot: AROME until Saturday 31 5:00 am; then ICON-EU until Tuesday 3 2:00 am; then ECMWF until Thursday 12 4:00 pm; 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 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Overcast	Overcast	Overcast	Overcast	Partly cloudy	Partly cloudy	Clear	Mainly clear
Temperature	52°	49°	49°	51°	58°	61°	56°	52°
Chance of rain	0%	0%	0%	0%	2%	1%	0%	0%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	6 SSW	4 SW	3 SSW	3 S	2 SSW	1 SE	5 ENE	6 E
Humidity	91%	95%	96%	93%	84%	70%	87%	94%
UV	0	0	0	0	1	1	0	0
Model	AROME	AROME	AROME	AROME	AROME	AROME	AROME	AROME

Do the models agree?

High confidence

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

What 7 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	60°	58°	55°	55°	56°	54°	51°
AIFS	58°	57°	54°	51°	53°	53°	49°
GFS	59°	60°	59°	59°	56°	55°	51°
ICON	60°	57°	51°	55°	56°	54°	49°
ARPEGE	58°	57°	52°	51°	—	—	—
AROME	61°	59°	—	—	—	—	—
ICON-EU	60°	57°	51°	55°	56°	—	—
Confidence	high	high	high	high	high	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0	0.02 in	0.12 in	0.06 in	0.01 in
AIFS	0	0	0	0	0.11 in	0.08 in	0
GFS	0	0	0	0.02 in	0.02 in	0.02 in	0
ICON	0	0	0	0	0.01 in	0	0
ARPEGE	0	0	0	0	—	—	—
AROME	0.00 in	0	—	—	—	—	—
ICON-EU	0	0	0	0.00 in	0.04 in	—	—
Confidence	high	high	high	high	medium	medium	high

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	610	917	814	927	1727	1529	1022
AIFS	6	9	8	8	17	17	15
GFS	813	918	915	2126	2126	1823	1521
ICON	59	815	714	612	1327	1733	1425
ARPEGE	58	1117	915	813	—	—	—
AROME	712	1119	—	—	—	—	—
ICON-EU	48	815	714	612	1326	—	—
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	2%	0%	0%	9%	27%	20%	4%
GFS (GEFS, 31 scenarios)	0%	0%	0%	26%	27%	29%	16%

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.

The next few weeks look normal for the time of year.

Next 6 weeks

When	TemperatureTemp.	Rain	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Below −2.9 °F	Below −81%	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.2 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.8 °F	A bit above +44%	50° / 44°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.0 °F	A bit above +34%	48° / 43°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +0.9 °F	A bit above +24%	47° / 42°

Coming months

When	TemperatureTemp.	Rain
November	A bit above +1.3 °F	Normal
December	Above +2.9 °F	Normal
January	A bit above +2.0 °F	Normal
February	A bit above +1.8 °F	A bit above +20%
March	A bit above +1.6 °F	Normal

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. The long-range sea temperature isn't usable at this spot (the model's grid cell falls on land).

Grande-Synthe climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Grande-Synthe is from July to August: highs of 72 °F, about 9 rainy days a month and 6 hours of sunshine a day.

46° 38°

JanJ
47° 38°

FebF
52° 41°

MarM
57° 44°

AprA
62° 50°

MayM
67° 55°

JunJ
71° 59°

JulJ
72° 60°

AugA
67° 56°

SepS
60° 50°

OctO
53° 44°

NovN
47° 39°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	46°	38°	2.20 in	9	1.2	46°	3.0 ft
FebruaryFeb	47°	38°	1.93 in	8	2.0	45°	3.0 ft
MarchMar	52°	41°	1.80 in	8	4.1	45°	2.6 ft
AprilApr	57°	44°	1.63 in	7	6.4	48°	2.2 ft
MayMay	62°	50°	1.78 in	8	6.3	53°	2.2 ft
JuneJun	67°	55°	2.07 in	9	6.7	58°	2.2 ft
JulyJul	71°	59°	2.26 in	9	6.7	62°	2.0 ft
AugustAug	72°	60°	2.56 in	9	6.0	65°	1.9 ft
SeptemberSep	67°	56°	2.56 in	9	4.9	64°	2.3 ft
OctoberOct	60°	50°	3.03 in	10	3.2	60°	2.6 ft
NovemberNov	53°	44°	2.97 in	12	1.3	55°	2.7 ft
DecemberDec	47°	39°	2.91 in	12	0.7	50°	3.1 ft

Month	Water	Waves
Jan	46°	3.0 ft
Feb	45°	3.0 ft
Mar	45°	2.6 ft
Apr	48°	2.2 ft
May	53°	2.2 ft
Jun	58°	2.2 ft
Jul	62°	2.0 ft
Aug	65°	1.9 ft
Sep	64°	2.3 ft
Oct	60°	2.6 ft
Nov	55°	2.7 ft
Dec	50°	3.1 ft

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

A normal year brings 27.69 in of rain on about 110 days and about 1,500 hours of sunshine.

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

Now49 °Ffeels like 47 °F

Tomorrow42 / 59 °F

It's 49 °F now (feels like 47 °F). Today, 47 °F to 61 °F; tomorrow, 42 °F to 59 °F.

Chance of rain

Today 2% 0.00 in
Fri 30 0%
Sat 31 0%
Sun 1 9% 0.00 in
Mon 2 27% 0.04 in
Tue 3 20% 0.06 in
Wed 4 4% 0.01 in

Today the chance of rain reaches 2%, with 0.00 in in total. The next day with likely rain is Tuesday 3: 20% and 0.06 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.11 in; last 7 days, 2.00 in.

Humidity and dew point

Humidity95%

Dew point48 °F

Humidity is 95% now and the dew point is 48 °F. The temperature is very close to the dew point: fog may form.

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

Visibility and fog

Now8.9 migood

Clouds100%

Visibility is good now (8.9 mi). No fog expected today.

UV index

Now0

Today's peak1low

Fri 30: 2 · Sat 31: 2 · Sun 1: 1

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid 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

30.3030.4030.50 30.47

Steady now (+0.01 inHg in 3 hours). Over the next 48 hours: +0.09 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 34

PollenNoneToday, at most none.

Pollen: Copernicus CAMS model (a rough guide, not a pollen trap). Levels use each type's usual thresholds.

Previous days

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

Day	Sky	Low / high	Rain	Max wind
Wed 28	Overcast	49 / 60 °F	0	12 mph WSW
Tue 27	Light drizzle	53 / 60 °F	0.05 in	17 mph SW
Mon 26	Light drizzle	49 / 57 °F	0.06 in	18 mph SSW
Sun 25	Light rain	53 / 60 °F	0.34 in	26 mph WSW
Sat 24	Light rain	48 / 54 °F	0.47 in	28 mph SW
Fri 23	Light rain	49 / 56 °F	0.87 in	29 mph SW
Thu 22	Rain	47 / 60 °F	0.54 in	21 mph SW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light drizzle	49 / 57 °F	0.06 in	23 mph SW
Tue 20	Drizzle	48 / 56 °F	0.08 in	14 mph SE
Mon 19	Overcast	45 / 57 °F	0	10 mph ESE
Sun 18	Drizzle	49 / 54 °F	0.18 in	12 mph NE
Sat 17	Light rain	52 / 57 °F	0.40 in	15 mph NNE
Fri 16	Heavy drizzle	56 / 63 °F	0.31 in	15 mph NW
Thu 15	Overcast	53 / 70 °F	0	11 mph S
Wed 14	Overcast	51 / 65 °F	0	13 mph SW
Tue 13	Light drizzle	61 / 69 °F	0.04 in	22 mph SW
Mon 12	Overcast	49 / 64 °F	0	13 mph SSE
Sun 11	Overcast	52 / 59 °F	0	15 mph W
Sat 10	Mainly clear	53 / 60 °F	0	17 mph W
Fri 9	Light rain	50 / 67 °F	0.40 in	23 mph WSW
Thu 8	Drizzle	51 / 57 °F	0.13 in	22 mph NW
Wed 7	Light rain	54 / 65 °F	0.35 in	21 mph NNE
Tue 6	Overcast	54 / 67 °F	0	7 mph SE
Mon 5	Overcast	52 / 70 °F	0	8 mph SW
Sun 4	Partly cloudy	49 / 68 °F	0	5 mph E
Sat 3	Overcast	50 / 67 °F	0	6 mph SSE
Fri 2	Partly cloudy	52 / 68 °F	0	7 mph SSW
Thu 1	Light drizzle	58 / 67 °F	0.02 in	10 mph WSW
Wed 30	Light rain	64 / 70 °F	0.34 in	12 mph SSE
Tue 29	Light drizzle	59 / 77 °F	0.04 in	9 mph ESE

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 Grande-SyntheQuestions

What's the weather like today in Grande-Synthe?

Overcast, from 47 °F to 61 °F, with a light breeze from the south (4 mph) and a 2% chance of rain.

Will it rain tomorrow in Grande-Synthe?

On Friday 30 the chance of rain is 0% (0.00 in): partly cloudy.

How warm will it be this week?

Between a low of 42 °F and a high of 61 °F; the warmest day, Thursday 29.

What's the UV index today?

It reaches 1 (low). No special protection needed.

Is the pressure rising or falling?

It's 30.37 inHg and steady: +0.11 inHg over the last 24 hours.

When is the best time to visit Grande-Synthe?

The best time to visit Grande-Synthe is from July to August: highs of 72 °F, about 9 rainy days a month and 6 hours of sunshine a day.

What is the weather like in Grande-Synthe in October?

In October, Grande-Synthe normally sees highs of 60 °F and lows of 50 °F, with about 10 rainy days (3.03 in for the month) and 3 hours of sunshine a day. The sea is around 60 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Grande-Synthe?

The warmest is August, with average highs of 72 °F, and the coldest January, with lows of 38 °F. The wettest is October (3.03 in) and the driest, April.

More about Grande-Synthe today

Weather near Grande-Synthe

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 2.4 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 6:40 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from