Water temperature in Iwanuma
Sea surface temperature · updated today, Thursday, October 29, at 8:58 am (GMT+9)- Today
- 66.9–67.1 °F
- Air today
- 41 / 61 °F
- Wed 4
- 65.8 °F
- Wetsuit
- Shorty (springsuit)
Today the water in Iwanuma is 67.1 °F and ranges 66.9–67.1 °F through the day, with the air between 41 °F and 61 °F. It cools over the next few days: about 65.8 °F by Wednesday 4.
The water over the next few days
- Today
- Fri 30
- Sat 31
- Sun 1
- Mon 2
- Tue 3
- Wed 4
- Thu 5
- Fri 6
- Sat 7
Water over the last 60 days
Over these days it has dropped 9.7 °F (from August 30).
Over the next few weeks the water looks normal for the time of year (+0.0 °F), according to ECMWF 46-day.
Daily average and its range (low and high). The dotted line is the forecast.
Water temperature by month vs. normal
The water off Iwanuma is warmer than normal for late October today (+3.1 °F).
- 52.2° 52°JanJ
- 48.4° 48°FebF
- 47.4° 47°MarM
- 50.5° 51°AprA
- 56.4° 56°MayM
- 63.8° 64°JunJ
- 70.0° 70°JulJ
- 74.8° 75°AugA
- 72.7° 73°SepS
- 66.9° 67°OctO
- 61.6° 62°NovN
- 56.8° 57°DecD
- Monthly normal
- Today
- Best time
The best time to swim in Iwanuma is from July to September, when the water averages 70.0–74.8 °F.
The water is warmest in August (74.8 °F on average) and coldest in March (47.4 °F).
Monthly averages for 1991–2020 (NOAA OISST, from satellites and buoys; nearest data point 15 mi away). Right by the shore, the water can be a little colder or warmer. Sources and licenses
Water and air, day by day
| Day | Water | Air | Max wave |
|---|---|---|---|
| Today | 66.9–67.1 °F | 41 / 61 °F | 2.8 ft |
| Fri 30 | 66.9–66.9 °F | 52 / 66 °F | 5.2 ft |
| Sat 31 | 66.7–66.9 °F | 46 / 67 °F | 5.3 ft |
| Sun 1 | 66.4–66.6 °F | 43 / 61 °F | 3.7 ft |
| Mon 2 | 66.2–66.4 °F | 49 / 58 °F | 3.8 ft |
| Tue 3 | 66.0–66.2 °F | 45 / 62 °F | 3.8 ft |
| Wed 4 | 65.7–65.8 °F | 44 / 60 °F | 3.0 ft |
Which wetsuit to wear
| Water | Wetsuit | How it feels |
|---|---|---|
| < 52 °F | 6/5 mm with hood, booties and gloves | Very cold: full kit only |
| 52°–57 °F | 5/4 mm with booties | Cold: takes your breath away |
| 57°–63 °F | 4/3 mm | Cool |
| 63°–66 °F | 3/2 mm | Mild |
| 66°–72 °F | Shorty (springsuit) | Pleasant |
| 72°–75 °F | Rash guard or top | Very pleasant |
| > 75 °F | No wetsuit | Warm |
A rough guide: it depends on the wind, how long you stay in and each person.
Fish are cold-blooded: the water sets their activity. Sudden temperature changes usually put them off the bite; with steady water, activity is more regular.
Previous days
The water over the last 60 days.
| Day | Water | Low / high |
|---|---|---|
| Wed 28 | 67.5 °F | 67.3–67.8 °F |
| Tue 27 | 67.8 °F | 67.8–68.0 °F |
| Mon 26 | 68.0 °F | 68.0–68.0 °F |
| Sun 25 | 68.0 °F | 68.0–68.2 °F |
| Sat 24 | 68.4 °F | 68.2–68.4 °F |
| Fri 23 | 68.5 °F | 68.4–68.7 °F |
| Thu 22 | 68.9 °F | 68.5–69.1 °F |
Show all 60 days
| Day | Water | Low / high |
|---|---|---|
| Wed 21 | 69.3 °F | 69.1–69.4 °F |
| Tue 20 | 69.4 °F | 69.3–69.4 °F |
| Mon 19 | 69.6 °F | 69.4–69.6 °F |
| Sun 18 | 69.8 °F | 69.6–70.0 °F |
| Sat 17 | 70.0 °F | 69.8–70.2 °F |
| Fri 16 | 70.2 °F | 70.0–70.3 °F |
| Thu 15 | 70.3 °F | 70.2–70.5 °F |
| Wed 14 | 70.9 °F | 70.3–71.4 °F |
| Tue 13 | 71.4 °F | 71.4–71.6 °F |
| Mon 12 | 71.6 °F | 71.4–71.8 °F |
| Sun 11 | 71.6 °F | 71.4–72.1 °F |
| Sat 10 | 71.6 °F | 71.4–72.0 °F |
| Fri 9 | 71.6 °F | 71.4–72.0 °F |
| Thu 8 | 71.8 °F | 71.4–72.1 °F |
| Wed 7 | 72.0 °F | 71.6–72.1 °F |
| Tue 6 | 72.1 °F | 72.0–72.5 °F |
| Mon 5 | 72.3 °F | 72.0–72.3 °F |
| Sun 4 | 72.5 °F | 72.3–72.5 °F |
| Sat 3 | 72.9 °F | 72.5–73.0 °F |
| Fri 2 | 73.0 °F | 72.7–73.4 °F |
| Thu 1 | 73.2 °F | 72.9–73.8 °F |
| Wed 30 | 73.0 °F | 72.9–73.2 °F |
| Tue 29 | 73.2 °F | 73.0–73.2 °F |
| Mon 28 | 73.4 °F | 73.4–73.6 °F |
| Sun 27 | 73.4 °F | 73.4–73.6 °F |
| Sat 26 | 73.6 °F | 73.4–73.8 °F |
| Fri 25 | 73.9 °F | 73.6–74.3 °F |
| Thu 24 | 73.9 °F | 73.4–74.8 °F |
| Wed 23 | 73.8 °F | 73.4–74.3 °F |
| Tue 22 | 73.6 °F | 73.4–74.1 °F |
| Mon 21 | 73.6 °F | 73.4–73.8 °F |
| Sun 20 | 73.8 °F | 73.6–73.9 °F |
| Sat 19 | 73.9 °F | 73.8–73.9 °F |
| Fri 18 | 74.1 °F | 73.9–74.1 °F |
| Thu 17 | 74.1 °F | 74.1–74.3 °F |
| Wed 16 | 75.0 °F | 74.1–75.7 °F |
| Tue 15 | 76.1 °F | 75.7–76.6 °F |
| Mon 14 | 76.6 °F | 75.9–77.5 °F |
| Sun 13 | 76.1 °F | 75.9–76.6 °F |
| Sat 12 | 76.3 °F | 76.1–76.6 °F |
| Fri 11 | 76.3 °F | 76.1–76.5 °F |
| Thu 10 | 76.5 °F | 76.3–76.5 °F |
| Wed 9 | 76.3 °F | 75.9–76.6 °F |
| Tue 8 | 76.3 °F | 76.1–76.6 °F |
| Mon 7 | 76.3 °F | 76.1–76.3 °F |
| Sun 6 | 76.5 °F | 76.5–76.6 °F |
| Sat 5 | 76.8 °F | 76.6–77.2 °F |
| Fri 4 | 77.2 °F | 76.8–77.5 °F |
| Thu 3 | 77.5 °F | 77.2–77.7 °F |
| Wed 2 | 77.4 °F | 76.6–78.4 °F |
| Tue 1 | 76.6 °F | 76.6–76.8 °F |
| Mon 31 | 77.0 °F | 76.8–77.2 °F |
| Sun 30 | 77.2 °F | 77.0–77.5 °F |
It's the daily analysis from Météo-France / Copernicus Marine (satellites, buoys and model), not a buoy reading at this spot.
Questions about the water in IwanumaQuestions
What's the water temperature today in Iwanuma?
67.1 °F; through the day it ranges 66.9–67.1 °F.
Will the water get warmer or colder?
It cools over the next few days: about 65.8 °F by Wednesday 4.
Which wetsuit do I need today?
With the water as it is today, shorty (springsuit) (pleasant). It's a rough guide: it depends on the wind and each person.
How warm is the water in Iwanuma in October?
In October, the water in Iwanuma averages 66.9 °F (1991–2020). For a long swim: shorty (springsuit) (pleasant).
How warm is the water in Iwanuma in August?
In August, the water in Iwanuma averages 74.8 °F (1991–2020), the warmest of the year. For a long swim: rash guard or top (very pleasant).
When is the best time to swim in Iwanuma?
The best time to swim in Iwanuma is from July to September, when the water averages 70.0–74.8 °F. The water is warmest in August (74.8 °F on average) and coldest in March (47.4 °F).
Is the water warmer or colder than normal?
The water off Iwanuma is warmer than normal for late October today (+3.1 °F).
More about Iwanuma today
Water temperature near Iwanuma
- Sakamoto 66.6 °F · 13 mi
- Tagajō 67.1 °F · 16 mi
- Sōma 66.6 °F · 22 mi
- Higashimatsushima 66.2 °F · 27 mi
- Onagawa 66.4 °F · 40 mi
- Namie 68.0 °F · 44 mi
Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.
Learn more
Sea surface temperature: Open-Meteo with Météo-France / Copernicus Marine, CC BY 4.0; grid point 1.6 mi away. Near the shore, in coves and estuaries, the water can be a little colder or warmer.
Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 8:58 am (local time).
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