Weather in Karatsu

14-day forecast · updated today, Thursday, October 29, at 7:54 am (GMT+9)

Now · mainly clear 57 °F

Feels like: 55 °F
Low / high: 49 / 68 °F
Rain: 76% · 0.14 in
Wind: 3 mph E

→ 30.24 inHg · steady

Today in Karatsu: drizzle, 49 °F to 68 °F, with a 76% chance of rain (0.14 in) and a light air from the east (3 mph). Tomorrow, rain, 57 °F to 71 °F and a 88% chance of rain. The warmest day of the week is Monday 2, at 73 °F.

Temperatures for the next 14 days

68° 49°
Today
71° 57°
Fri 30
71° 52°
Sat 31
70° 49°
Sun 1
73° 59°
Mon 2
67° 55°
Tue 3
60° 55°
Wed 4
71° 58°
Thu 5
62° 49°
Fri 6
61° 48°
Sat 7
66° 53°
Sun 8
58° 47°
Mon 9
60° 45°
Tue 10
64° 44°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Drizzle	49 / 68 °F	76% · 0.14 in	3 mph SE	1.2 ft	11:44 am · 11:13 pm	ECMWF
Fri 30	Rain	57 / 71 °F	88% · 0.44 in	10 mph W	1.6 ft	12:36 pm · 11:59 pm	ECMWF
Sat 31	Mainly clear	52 / 71 °F	0%	11 mph WNW	1.7 ft	1:37 pm	ECMWF
Sun 1	Overcast	49 / 70 °F	16%	8 mph SE	1.0 ft	1:01 am · 2:57 pm	ECMWF
Mon 2	Rain	59 / 73 °F	90% · 0.96 in	13 mph WNW	2.0 ft	2:35 am · 4:32 pm	ECMWF
Tue 3	Overcast	55 / 67 °F	0%	9 mph N	2.4 ft	4:19 am · 5:44 pm	ECMWF
Wed 4	Light drizzle	55 / 60 °F	6% · 0.07 in	3 mph ENE	1.9 ft	5:41 am · 6:31 pm	ECMWF
Thu 5	Overcast	58 / 71 °F	14%	8 mph NNW	1.5 ft	6:45 am · 7:08 pm	ECMWF
Fri 6	Partly cloudy	49 / 62 °F	16%	13 mph NNW	1.6 ft	7:38 am · 7:40 pm	ECMWF
Sat 7	Overcast	48 / 61 °F	8%	7 mph ENE	3.2 ft	8:24 am · 8:10 pm	ECMWF
Sun 8	Overcast	53 / 66 °F	12%	11 mph NNW	3.7 ft	9:05 am · 8:39 pm	ECMWF
Mon 9	Light drizzle	47 / 58 °F	11% · 0.02 in	10 mph NNW	5.0 ft	9:43 am · 9:08 pm	ECMWF
Tue 10	Overcast	45 / 60 °F	16%	9 mph NW	3.5 ft	10:19 am · 9:36 pm	ECMWF
Wed 11	Overcast	44 / 64 °F	15%	3 mph WSW	2.3 ft	10:54 am · 10:04 pm	ECMWF

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	Clear	Clear	Overcast	Mainly clear	Light drizzle	Light drizzle	Overcast	Light drizzle
Temperature	51°	50°	49°	61°	67°	67°	62°	61°
Chance of rain	0%	0%	0%	0%	4%	76%	20%	39%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.02 in	0.00 in	0.01 in
Wind (mph)	0 ESE	1 SSE	2 SSE	3 E	3 SSW	3 SSE	2 ESE	2 ESE
Humidity	90%	85%	85%	66%	73%	77%	94%	98%
UV	0	0	0	2	2	0	0	0
Model	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF

Do the models agree?

Medium confidence

They broadly agree, but not quite on rain tomorrow: take it with some caution.

What 4 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	68°	71°	71°	70°	73°	67°	60°
AIFS	68°	72°	73°	72°	70°	70°	66°
GFS	68°	68°	69°	72°	71°	65°	66°
ICON	67°	69°	69°	70°	73°	66°	64°
Confidence	high	high	high	high	high	high	medium

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0.14 in	0.44 in	0	0	0.96 in	0	0.07 in
AIFS	0.17 in	0.50 in	0	0.02 in	0.52 in	0	0.06 in
GFS	0.04 in	0.21 in	0	0	0.70 in	0	0
ICON	0.06 in	0.59 in	0	0	0.38 in	0	0
Confidence	high	medium	high	high	medium	high	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	313	1023	1125	829	1329	924	316
AIFS	3	8	8	6	10	9	5
GFS	713	1219	917	1636	2245	1419	1826
ICON	712	920	1018	815	1324	1323	921
Confidence	high	high	high	medium	medium	high	low

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	76%	88%	0%	16%	90%	0%	6%
GFS (GEFS, 31 scenarios)	82%	84%	0%	12%	98%	10%	6%

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: a bit warmer, normal rain and a slightly warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Normal 0.0 °F	A bit below −49%	A bit above +1.4 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.4 °F	Normal	A bit above +1.4 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.1 °F	Normal	A bit above +1.4 °F	62° / 57°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.2 °F	A bit above +29%	A bit above +1.4 °F	60° / 55°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.2 °F	A bit above +30%	A bit above +1.6 °F	58° / 54°

Coming months

When	TemperatureTemp.	Rain	Sea
November	A bit above +2.2 °F	A bit above +37%	Above +2.3 °F
December	A bit above +1.8 °F	A bit above +45%	Above +2.3 °F
January	A bit above +1.8 °F	Normal	A bit above +1.6 °F
February	A bit above +2.5 °F	Normal	A bit above +1.3 °F
March	A bit above +1.8 °F	A bit above +22%	A bit above +1.3 °F

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.

Karatsu climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Karatsu is in October and in May: highs of 73 °F, about 8 rainy days a month and 5 hours of sunshine a day.

Typhoon season: from July to September, peaking in September. In the last 30 years (1996–2025), 28 tropical cyclones passed within 93 mi of Karatsu, about 9 every 10 years; 16 of them with hurricane-force winds (74 mph or more). The most recent: Shanshan, in August 2024.

49° 37°

JanJ
51° 39°

FebF
56° 44°

MarM
65° 52°

AprA
73° 59°

MayM
77° 67°

JunJ
84° 74°

JulJ
87° 76°

AugA
80° 70°

SepS
73° 60°

OctO
63° 50°

NovN
53° 40°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	49°	37°	2.63 in	7	2.8	60°	2.2 ft	–
FebruaryFeb	51°	39°	2.98 in	7	3.6	58°	2.0 ft	–
MarchMar	56°	44°	4.41 in	10	4.6	58°	1.7 ft	–
AprilApr	65°	52°	5.50 in	9	5.1	60°	1.5 ft	–
MayMay	73°	59°	5.43 in	9	5.6	64°	1.0 ft	–
JuneJun	77°	67°	11.71 in	14	3.7	69°	1.0 ft	2
JulyJul	84°	74°	11.21 in	15	4.8	76°	1.0 ft	6
AugustAug	87°	76°	7.28 in	13	6.0	80°	1.1 ft	9
SeptemberSep	80°	70°	8.98 in	11	4.9	78°	1.5 ft	10
OctoberOct	73°	60°	4.16 in	7	5.2	73°	1.7 ft	1
NovemberNov	63°	50°	3.52 in	8	4.1	69°	1.7 ft	–
DecemberDec	53°	40°	3.18 in	7	3.1	64°	2.2 ft	–

Month	Water	Waves	Cyclones
Jan	60°	2.2 ft	–
Feb	58°	2.0 ft	–
Mar	58°	1.7 ft	–
Apr	60°	1.5 ft	–
May	64°	1.0 ft	–
Jun	69°	1.0 ft	2
Jul	76°	1.0 ft	6
Aug	80°	1.1 ft	9
Sep	78°	1.5 ft	10
Oct	73°	1.7 ft	1
Nov	69°	1.7 ft	–
Dec	64°	2.2 ft	–

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

A normal year brings 70.98 in of rain on about 116 days and about 1,650 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

Now57 °Ffeels like 55 °F

Tomorrow57 / 71 °F

It's 57 °F now (feels like 55 °F). Today, 49 °F to 68 °F; tomorrow, 57 °F to 71 °F.

Chance of rain

Today 76% 0.14 in
Fri 30 88% 0.44 in
Sat 31 0%
Sun 1 16%
Mon 2 90% 0.96 in
Tue 3 0%
Wed 4 6% 0.07 in

Today the chance of rain reaches 76%, with 0.14 in in total. The next day with likely rain is Friday 30: 88% and 0.44 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.65 in; last 7 days, 6.81 in.

Humidity and dew point

Humidity72%

Dew point48 °F

Humidity is 72% now and the dew point is 48 °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

Now15 migood

Clouds45%

Visibility is good now (15 mi). No fog expected today.

The model gives visibility up to about 15 mi: beyond that, the horizon is clear.

UV index

Now1

Today's peak3low

Fri 30: 4 · Sat 31: 5 · Sun 1: 3

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

30.0030.1030.2030.30 30.00

Steady now (+0.02 inHg in 3 hours). Over the next 48 hours: −0.06 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 35

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.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Clear sky	51 / 69 °F	0	11 mph N
Tue 27	Light drizzle	61 / 72 °F	0.05 in	13 mph NNW
Mon 26	Heavy rain	65 / 74 °F	2.52 in	10 mph N
Sun 25	Rain	68 / 73 °F	1.98 in	6 mph NNE
Sat 24	Rain	66 / 78 °F	0.66 in	6 mph E
Fri 23	Rain	56 / 69 °F	1.60 in	5 mph E
Thu 22	Overcast	60 / 72 °F	0	10 mph N

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light rain	61 / 74 °F	0.28 in	12 mph W
Tue 20	Light drizzle	67 / 84 °F	0.05 in	11 mph SSW
Mon 19	Overcast	69 / 84 °F	0	9 mph SSW
Sun 18	Overcast	60 / 84 °F	0	9 mph SSE
Sat 17	Overcast	53 / 83 °F	0	6 mph E
Fri 16	Overcast	57 / 78 °F	0	4 mph NNE
Thu 15	Overcast	50 / 75 °F	0	5 mph N
Wed 14	Clear sky	56 / 72 °F	0	13 mph NNW
Tue 13	Light drizzle	68 / 82 °F	0.08 in	13 mph SSW
Mon 12	Overcast	68 / 85 °F	0	3 mph S
Sun 11	Light drizzle	65 / 84 °F	0.01 in	5 mph NNW
Sat 10	Overcast	68 / 82 °F	0	6 mph E
Fri 9	Light drizzle	58 / 80 °F	0.01 in	3 mph NE
Thu 8	Clear sky	53 / 78 °F	0	4 mph NE
Wed 7	Mainly clear	59 / 75 °F	0	11 mph NNW
Tue 6	Light drizzle	61 / 73 °F	0.01 in	12 mph NNW
Mon 5	Partly cloudy	63 / 78 °F	0	11 mph NW
Sun 4	Light drizzle	65 / 75 °F	0.09 in	6 mph N
Sat 3	Light drizzle	56 / 80 °F	0.02 in	7 mph ENE
Fri 2	Partly cloudy	62 / 77 °F	0	10 mph N
Thu 1	Overcast	66 / 83 °F	0	9 mph NNW
Wed 30	Partly cloudy	63 / 84 °F	0	4 mph NNW
Tue 29	Light rain	69 / 82 °F	0.17 in	4 mph E

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 KaratsuQuestions

What's the weather like today in Karatsu?

Drizzle, from 49 °F to 68 °F, with a light air from the east (3 mph) and a 76% chance of rain.

Will it rain tomorrow in Karatsu?

On Friday 30 the chance of rain is 88% (0.44 in): rain.

How warm will it be this week?

Between a low of 49 °F and a high of 73 °F; the warmest day, Monday 2.

What's the UV index today?

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

Is the pressure rising or falling?

It's 30.24 inHg and steady: +0.01 inHg over the last 24 hours.

When is the best time to visit Karatsu?

The best time to visit Karatsu is in October and in May: highs of 73 °F, about 8 rainy days a month and 5 hours of sunshine a day.

What is the weather like in Karatsu in October?

In October, Karatsu normally sees highs of 73 °F and lows of 60 °F, with about 7 rainy days (4.16 in for the month) and 5 hours of sunshine a day. The sea is around 73 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Karatsu?

The warmest is August, with average highs of 87 °F, and the coldest January, with lows of 37 °F. The wettest is June (11.71 in) and the driest, January.

When is typhoon season in Karatsu?

Typhoon season: from July to September, peaking in September. In the last 30 years (1996–2025), 28 tropical cyclones passed within 93 mi of Karatsu, about 9 every 10 years; 16 of them with hurricane-force winds (74 mph or more). The most recent: Shanshan, in August 2024.

More about Karatsu today

Weather near Karatsu

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 13 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 7:54 am (local time).

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