Sea weather in Karatsu in Japan All the beach weather in Karatsu

All the essential weather information for enjoying the beach in Karatsu in Japan, for swimming, tanning or water sports! Our sea weather data is reliable, easy to read and updated every day.

Weather: When should you go to the beach in Karatsu over the next 7 days?

Discover the best moment to go to the beach in Karatsu in Japan this week to enjoy the best weather and calmest sea possible. Our opinion is based on reliable sea weather forecasts in Karatsu. You can see full forecasts by clicking on the day you want to see in the table below.

Date Outside temp. Our opinion
Thursday 29 January 202643°F to 47°Fdiscouraged
Friday 30 January 202640°F to 43°Fdiscouraged
Saturday 31 January 202643°F to 47°Frecommended
Sunday 1 February 202643°F to 47°Fdiscouraged
Monday 2 February 202643°F to 49°Fdiscouraged
Tuesday 3 February 202640°F to 47°Fdiscouraged
Wednesday 4 February 202645°F to 52°Frecommended

Sea Weather: Your daily and hourly sea weather in Karatsu

Sea weather on Thursday 29 January 2026

On Thursday 29 January 2026, the sun will rise at 07:19 and will set at 17:48 on the beach(es) of Karatsu. The outside temperature will be a high of 47°F t and a low of 43°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 23mph km/h (with gusts up to 29.8mph). Wave height will be up to 3.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature6°C (43°F)6°C (42°F)6°C (42°F)6°C (43°F)6°C (43°F)6°C (44°F)7°C (44°F)8°C (46°F)
Perceived temperature2°C (36°F)1°C (35°F)1°C (34°F)2°C (36°F)3°C (37°F)3°C (37°F)2°C (35°F)3°C (37°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity46%49%49%49%51%50%56%53%
Barometric pressure1026 hPa1026 hPa1026 hPa1027 hPa1028 hPa1027 hPa1027 hPa1027 hPa
Cloud cover0%0%2%16%68%59%68%100%
Heat index6°C (43°F)6°C (42°F)6°C (42°F)6°C (43°F)6°C (43°F)6°C (44°F)7°C (44°F)8°C (46°F)
Dew point-5°C (24°F)-4°C (25°F)-4°C (24°F)-4°C (25°F)-3°C (27°F)-3°C (26°F)-2°C (29°F)-1°C (30°F)
Wind
Speed24km/h (15mph)26km/h (16mph)26km/h (16mph)20km/h (12mph)21km/h (13mph)20km/h (13mph)33km/h (21mph)37km/h (23mph)
Gusts33km/h (20mph)34km/h (21mph)35km/h (22mph)25km/h (15mph)26km/h (16mph)26km/h (16mph)46km/h (28mph)48km/h (30mph)
Direction 331°
NNW
334°
NNW
341°
NNW
332°
NNW
322°
NW
317°
NW
296°
WNW
302°
WNW
Wind chill2°C (36°F)1°C (35°F)1°C (34°F)2°C (36°F)3°C (37°F)3°C (37°F)2°C (35°F)3°C (37°F)
Waves
Height0.9m (2.9ft)0.9m (3.1ft)1.0m (3.2ft)1.0m (3.1ft)0.9m (3.0ft)0.9m (3.0ft)0.8m (2.8ft)0.8m (2.7ft)
Direction 10°
N
358°
N

N
10°
N
10°
N

N

N

N
Period7.3 sec.7.5 sec.7.6 sec.7.6 sec.7.3 sec.7.3 sec.7.3 sec.7.3 sec.
Significant height0.9m (3ft)0.8m (2.6ft)0.8m (2.6ft)0.6m (2ft)0.5m (1.6ft)0.6m (2ft)1.3m (4.3ft)0.8m (2.6ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Friday 30 January 2026

On Friday 30 January 2026, the sun will rise at 07:18 and will set at 17:49 on the beach(es) of Karatsu. The outside temperature will be a high of 43°F t and a low of 40°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 19.9mph km/h (with gusts up to 25.5mph). Wave height will be up to 3.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature6°C (44°F)6°C (42°F)5°C (41°F)5°C (42°F)5°C (42°F)6°C (42°F)5°C (41°F)5°C (42°F)
Perceived temperature2°C (36°F)1°C (33°F)0°C (33°F)1°C (34°F)2°C (35°F)2°C (35°F)1°C (34°F)2°C (35°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity54%51%50%50%46%46%47%48%
Barometric pressure1026 hPa1027 hPa1027 hPa1027 hPa1027 hPa1026 hPa1027 hPa1027 hPa
Cloud cover48%28%46%14%33%46%32%20%
Heat index6°C (44°F)6°C (42°F)5°C (41°F)5°C (42°F)5°C (42°F)6°C (42°F)5°C (41°F)5°C (42°F)
Dew point-2°C (28°F)-4°C (25°F)-4°C (24°F)-4°C (24°F)-5°C (23°F)-5°C (23°F)-5°C (23°F)-5°C (23°F)
Wind
Speed28km/h (18mph)32km/h (20mph)27km/h (17mph)23km/h (14mph)20km/h (12mph)21km/h (13mph)19km/h (12mph)18km/h (11mph)
Gusts37km/h (23mph)41km/h (26mph)35km/h (22mph)28km/h (17mph)25km/h (16mph)27km/h (17mph)28km/h (17mph)25km/h (15mph)
Direction 314°
NW
327°
NNW
328°
NNW
327°
NNW
323°
NW
323°
NW
338°
NNW
340°
NNW
Wind chill2°C (36°F)1°C (33°F)0°C (33°F)1°C (34°F)2°C (35°F)2°C (35°F)1°C (34°F)2°C (35°F)
Waves
Height0.8m (2.7ft)1.0m (3.3ft)1.0m (3.3ft)1.0m (3.4ft)1.0m (3.2ft)0.8m (2.8ft)0.8m (2.7ft)0.7m (2.5ft)
Direction
N

N

N

N

N

N
12°
NNE
13°
NNE
Period7.3 sec.6.9 sec.6.7 sec.6.4 sec.6.9 sec.6.1 sec.7.7 sec.7.8 sec.
Significant height0.8m (2.6ft)0.9m (3ft)1.5m (4.9ft)0.7m (2.3ft)0.7m (2.3ft)0.5m (1.6ft)1.2m (3.9ft)0.3m (1ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Saturday 31 January 2026

On Saturday 31 January 2026, the sun will rise at 07:17 and will set at 17:50 on the beach(es) of Karatsu. The outside temperature will be a high of 47°F t and a low of 43°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 12.4mph km/h (with gusts up to 16.8mph). Wave height will be up to 2.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature6°C (42°F)6°C (42°F)6°C (42°F)7°C (44°F)7°C (45°F)7°C (45°F)7°C (44°F)8°C (46°F)
Perceived temperature2°C (35°F)2°C (36°F)3°C (37°F)5°C (40°F)6°C (42°F)6°C (43°F)5°C (42°F)6°C (42°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity46%46%47%43%42%39%45%54%
Barometric pressure1027 hPa1027 hPa1026 hPa1026 hPa1026 hPa1024 hPa1024 hPa1024 hPa
Cloud cover14%10%44%48%100%100%100%100%
Heat index6°C (42°F)6°C (42°F)6°C (42°F)7°C (44°F)7°C (45°F)7°C (45°F)7°C (44°F)8°C (46°F)
Dew point-5°C (23°F)-5°C (23°F)-5°C (24°F)-5°C (23°F)-5°C (23°F)-6°C (22°F)-4°C (25°F)-1°C (30°F)
Wind
Speed20km/h (13mph)16km/h (10mph)15km/h (10mph)10km/h (6mph)8km/h (5mph)7km/h (4mph)8km/h (5mph)11km/h (7mph)
Gusts27km/h (17mph)22km/h (14mph)23km/h (14mph)13km/h (8mph)11km/h (7mph)10km/h (6mph)12km/h (8mph)16km/h (10mph)
Direction 348°
NNW
331°
NNW
349°
N
14°
NNE

N
314°
NW
285°
WNW
262°
W
Wind chill2°C (35°F)2°C (36°F)3°C (37°F)5°C (40°F)6°C (42°F)6°C (43°F)5°C (42°F)6°C (42°F)
Waves
Height0.7m (2.2ft)0.6m (2.0ft)0.6m (2.0ft)0.6m (2.0ft)0.6m (2.0ft)0.6m (1.9ft)0.5m (1.8ft)0.5m (1.7ft)
Direction 13°
NNE
12°
NNE
10°
N
11°
N
10°
N
10°
N
10°
N

N
Period7.9 sec.8.1 sec.8.2 sec.8.1 sec.8.0 sec.8.0 sec.8.1 sec.8.3 sec.
Significant height0.1m (0.3ft)0.9m (3ft)0.8m (2.6ft)0.9m (3ft)0.9m (3ft)0.8m (2.6ft)0.8m (2.6ft)0.8m (2.6ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Sunday 1 February 2026

On Sunday 1 February 2026, the sun will rise at 07:17 and will set at 17:51 on the beach(es) of Karatsu. The outside temperature will be a high of 47°F t and a low of 43°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 20.5mph km/h (with gusts up to 25.5mph). Wave height will be up to 3.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature8°C (46°F)8°C (46°F)7°C (44°F)6°C (43°F)6°C (43°F)7°C (44°F)7°C (44°F)7°C (45°F)
Perceived temperature5°C (41°F)5°C (40°F)3°C (37°F)2°C (36°F)2°C (36°F)2°C (35°F)2°C (36°F)3°C (38°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity56%54%59%58%55%57%55%54%
Barometric pressure1023 hPa1023 hPa1024 hPa1025 hPa1025 hPa1024 hPa1024 hPa1025 hPa
Cloud cover100%78%99%91%96%94%89%80%
Heat index8°C (46°F)8°C (46°F)7°C (44°F)6°C (43°F)6°C (43°F)7°C (44°F)7°C (44°F)7°C (45°F)
Dew point-0°C (32°F)-1°C (30°F)-1°C (31°F)-1°C (30°F)-2°C (28°F)-1°C (29°F)-2°C (29°F)-2°C (29°F)
Wind
Speed19km/h (12mph)19km/h (12mph)23km/h (14mph)24km/h (15mph)21km/h (13mph)33km/h (20mph)27km/h (17mph)24km/h (15mph)
Gusts26km/h (16mph)26km/h (16mph)31km/h (19mph)30km/h (19mph)26km/h (16mph)41km/h (25mph)38km/h (23mph)33km/h (21mph)
Direction 271°
W
304°
NW
317°
NW
317°
NW
308°
NW
293°
WNW
305°
NW
305°
NW
Wind chill5°C (41°F)5°C (40°F)3°C (37°F)2°C (36°F)2°C (36°F)2°C (35°F)2°C (36°F)3°C (38°F)
Waves
Height0.5m (1.6ft)0.5m (1.6ft)0.6m (1.9ft)0.8m (2.5ft)0.8m (2.6ft)0.8m (2.7ft)1.0m (3.3ft)0.9m (3.0ft)
Direction
N

N

N

N

N

N
327°
NNW
351°
N
Period8.5 sec.8.6 sec.8.6 sec.8.4 sec.6.7 sec.7.3 sec.7.2 sec.7.0 sec.
Significant height0.4m (1.3ft)0.3m (1ft)0.3m (1ft)0.9m (3ft)0.6m (2ft)0.9m (3ft)1.2m (3.9ft)0.8m (2.6ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Monday 2 February 2026

On Monday 2 February 2026, the sun will rise at 07:16 and will set at 17:52 on the beach(es) of Karatsu. The outside temperature will be a high of 49°F t and a low of 43°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 23mph km/h (with gusts up to 29.8mph). Wave height will be up to 3.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature7°C (44°F)6°C (43°F)7°C (44°F)7°C (45°F)7°C (45°F)8°C (47°F)8°C (46°F)8°C (47°F)
Perceived temperature3°C (37°F)3°C (37°F)2°C (36°F)2°C (36°F)3°C (38°F)4°C (39°F)3°C (38°F)4°C (39°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity56%56%56%54%55%52%53%51%
Barometric pressure1025 hPa1025 hPa1025 hPa1026 hPa1026 hPa1024 hPa1024 hPa1025 hPa
Cloud cover94%100%100%77%89%81%89%74%
Heat index7°C (44°F)6°C (43°F)7°C (44°F)7°C (45°F)7°C (45°F)8°C (47°F)8°C (46°F)8°C (47°F)
Dew point-2°C (29°F)-2°C (29°F)-1°C (29°F)-2°C (29°F)-1°C (30°F)-1°C (30°F)-1°C (29°F)-1°C (30°F)
Wind
Speed22km/h (13mph)17km/h (11mph)31km/h (19mph)33km/h (20mph)30km/h (19mph)37km/h (23mph)33km/h (20mph)35km/h (22mph)
Gusts28km/h (18mph)23km/h (14mph)39km/h (24mph)40km/h (25mph)37km/h (23mph)48km/h (30mph)47km/h (29mph)47km/h (29mph)
Direction 294°
WNW
326°
NW
293°
WNW
301°
WNW
293°
WNW
293°
WNW
291°
WNW
296°
WNW
Wind chill3°C (37°F)3°C (37°F)2°C (36°F)2°C (36°F)3°C (38°F)4°C (39°F)3°C (38°F)4°C (39°F)
Waves
Height0.9m (2.9ft)0.7m (2.2ft)0.7m (2.4ft)0.9m (3.1ft)0.9m (2.8ft)0.9m (3.0ft)0.9m (2.9ft)1.0m (3.2ft)
Direction 332°
NNW
359°
N
359°
N
319°
NW
325°
NW
320°
NW
317°
NW
314°
NW
Period6.9 sec.6.3 sec.7.0 sec.6.9 sec.6.9 sec.7.4 sec.7.4 sec.7.4 sec.
Significant height0.8m (2.6ft)0.4m (1.3ft)0.7m (2.3ft)1.1m (3.6ft)0.8m (2.6ft)1.1m (3.6ft)1.1m (3.6ft)1.2m (3.9ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Tuesday 3 February 2026

On Tuesday 3 February 2026, the sun will rise at 07:15 and will set at 17:53 on the beach(es) of Karatsu. The outside temperature will be a high of 47°F t and a low of 40°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 20.5mph km/h (with gusts up to 27.3mph). Wave height will be up to 3.3ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature8°C (47°F)7°C (45°F)6°C (44°F)7°C (45°F)5°C (42°F)5°C (41°F)4°C (39°F)7°C (45°F)
Perceived temperature4°C (39°F)3°C (37°F)3°C (38°F)4°C (40°F)2°C (36°F)3°C (37°F)2°C (36°F)6°C (42°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity54%57%58%50%46%43%46%54%
Barometric pressure1025 hPa1025 hPa1026 hPa1028 hPa1028 hPa1027 hPa1027 hPa1027 hPa
Cloud cover100%55%3%0%0%0%0%2%
Heat index8°C (47°F)7°C (45°F)6°C (44°F)7°C (45°F)5°C (42°F)5°C (41°F)4°C (39°F)7°C (45°F)
Dew point-1°C (31°F)-1°C (31°F)-1°C (30°F)-3°C (27°F)-5°C (22°F)-6°C (21°F)-7°C (20°F)-2°C (29°F)
Wind
Speed33km/h (21mph)28km/h (17mph)17km/h (10mph)14km/h (9mph)14km/h (9mph)10km/h (6mph)6km/h (4mph)8km/h (5mph)
Gusts44km/h (27mph)37km/h (23mph)24km/h (15mph)18km/h (11mph)26km/h (16mph)21km/h (13mph)12km/h (8mph)13km/h (8mph)
Direction 299°
WNW
305°
NW
338°
NNW
321°
NW
320°
NW
302°
WNW
262°
W
227°
SW
Wind chill4°C (39°F)3°C (37°F)3°C (38°F)4°C (40°F)2°C (36°F)3°C (37°F)2°C (36°F)6°C (42°F)
Waves
Height1.0m (3.3ft)0.9m (3.0ft)0.7m (2.4ft)0.6m (2.0ft)0.6m (1.9ft)0.6m (2.0ft)0.5m (1.8ft)0.4m (1.4ft)
Direction 317°
NW
320°
NW
327°
NNW
351°
N
359°
N
356°
N
359°
N
356°
N
Period7.0 sec.6.8 sec.7.1 sec.6.5 sec.7.0 sec.6.8 sec.6.5 sec.6.3 sec.
Significant height1.1m (3.6ft)0.8m (2.6ft)0.7m (2.3ft)0.9m (3ft)0.9m (3ft)0.6m (2ft)0.4m (1.3ft)0.2m (0.7ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather on Wednesday 4 February 2026

On Wednesday 4 February 2026, the sun will rise at 07:15 and will set at 17:54 on the beach(es) of Karatsu. The outside temperature will be a high of 52°F t and a low of 45°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 12.4mph km/h (with gusts up to 19.9mph). Wave height will be up to 1ft today.

0:003:006:009:0012:0015:0018:0021:00
Weather
Sky condition
Outside temperature7°C (44°F)7°C (45°F)7°C (45°F)8°C (47°F)11°C (51°F)11°C (51°F)11°C (51°F)11°C (51°F)
Perceived temperature4°C (40°F)4°C (39°F)4°C (39°F)6°C (42°F)8°C (47°F)8°C (46°F)9°C (47°F)9°C (48°F)
Precipitation0in0in0in0in0in0in0in0in
Humidity62%65%68%65%57%53%63%67%
Barometric pressure1026 hPa1025 hPa1024 hPa1025 hPa1023 hPa1021 hPa1021 hPa1021 hPa
Cloud cover0%12%18%28%100%8%58%52%
Heat index7°C (44°F)7°C (45°F)7°C (45°F)8°C (47°F)11°C (51°F)11°C (51°F)11°C (51°F)11°C (51°F)
Dew point0°C (32°F)1°C (34°F)2°C (35°F)2°C (36°F)3°C (37°F)1°C (34°F)4°C (39°F)5°C (41°F)
Wind
Speed13km/h (8mph)16km/h (10mph)17km/h (10mph)17km/h (11mph)18km/h (11mph)20km/h (13mph)15km/h (10mph)16km/h (10mph)
Gusts20km/h (12mph)25km/h (15mph)27km/h (16mph)24km/h (15mph)24km/h (15mph)32km/h (20mph)24km/h (15mph)24km/h (15mph)
Direction 208°
SSW
185°
S
194°
SSW
202°
SSW
228°
SW
243°
WSW
246°
WSW
209°
SSW
Wind chill4°C (40°F)4°C (39°F)4°C (39°F)6°C (42°F)8°C (47°F)8°C (46°F)9°C (47°F)9°C (48°F)
Waves
Height0.3m (1.1ft)0.3m (1.0ft)0.3m (0.9ft)0.2m (0.8ft)0.2m (0.7ft)0.2m (0.8ft)0.2m (0.8ft)0.2m (0.6ft)
Direction 360°
N
358°
N

N

N

N
10°
N
10°
N

N
Period6.1 sec.6.0 sec.5.9 sec.5.8 sec.5.5 sec.5.5 sec.5.6 sec.3.3 sec.
Significant height0.6m (2ft)0.4m (1.3ft)0.4m (1.3ft)0.3m (1ft)0.4m (1.3ft)0.4m (1.3ft)0.4m (1.3ft)0.2m (0.7ft)
Sea water temperature
Water temperature15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)15°C (58°F)

Sea weather chart over the next 7 days

Outside temperature

Wind speed

Precipitation

Wave height

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