MARINE REPORT / 72 HOURS

Tumon Bay Snorkel Report Today

Guam · Updated Sat 23:18 (ChST) · Source: Snapshot

The skinny

No forecast for later today Data updated Sat 23:18 (ChST)

No remaining forecast hours are available for today in Tumon Bay. Check the three-day outlook.

Right now (forecast)

Poor · 0.0/10

Sat 23:00 (ChST)

Later today

No fresh data for this period.

Next three days

Fair · 3.9/10

Tue 14:00 (ChST)

Model estimates using Open-Meteo; not observations or safety guarantees. Check official advisories and conditions at the beach.

Score: No score

Best time: -

Main risk: Changing Conditions

No useful morning window is showing yet.

No useful afternoon window is showing yet.

Email me when it is good

Sunrise

06:11

Sunset

18:00

Water

29.2°C

Max air

27.2°C

Sky

Cloudy

100% cloud

No good model window in the next 72 hours

Use the best-available section for the least-bad times.

3-day planner Best available Show data

3-day planner

Sunday

❌ Poor conditions

Main blocker: Waves

Monday

❌ Poor conditions

Main blocker: Waves

Tuesday

⚠️ Fair conditions

Main blocker: Waves

Best available hours

  • Tue 14:00: Fair (0.39) · still limited by waves, tide/current
  • Tue 15:00: Fair (0.37) · still limited by waves, tide/current
  • Tue 17:00: Poor (0.33) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (71 hours)
  • Tide/current (71 hours)
  • Wind (55 hours)

Jellyfish drift risk

Drift estimate from wind, swell, current and warm water.

Low · 34/100

Low drift risk now.

warm water supports seasonal jellyfish activity; surface drift/current is noticeable; local shoreline exposure is not mapped yet.

Sightings override the model: if you see small purple jellyfish with long trailing tentacles, treat them as sting-capable and give them space.

Upcoming high tides

Tue 16:00

Nearby alternatives in Guam

No nearby alternatives available.

Advanced forecast data

Viewing historical data

Sun 23:00 – Wed 23:00 (ChST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.44 around Mon 18:00; 5 of 24 hours are good, fair, or excellent.

Score trend, higher is better. Excellent ≥ 0.72, good 0.55–0.72, fair 0.35–0.55.

Conditions (24h trends)

Tap a chart to load just that series.

0/24 sampled hours stay at or below 0.36m (range 1.04m to 1.32m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 1.36 to 3.65m/s).

Tides range from 0.14m to 0.81m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Scoring methodology (for technical users)

We score each hour from 0 to 1 using daylight and these weighted components:

  • Wave height (35%): best below 0.36m, then decreases as it rises.
  • Wind speed (25%): best below 5.4m/s, lower is better.
  • Sea surface temperature (15%): best within 20.6°C to 30.4°C.
  • Tide and currents (15%): best around slack/high-tide windows.
  • Daylight (10%): visibility is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Sun 23:00 1.32 · high 1.95 · good 29.30 · good Poor
Mon 00:00 1.30 · high 1.77 · good 29.30 · good Poor
Mon 01:00 1.30 · high 2.37 · good 29.30 · good Poor
Mon 02:00 1.18 · high 1.36 · good 29.30 · good Poor
Mon 03:00 1.18 · high 1.48 · good 29.30 · good Poor
Mon 04:00 1.18 · high 1.43 · good 29.30 · good Poor
Mon 05:00 1.18 · high 1.61 · good 29.30 · good Poor
Mon 06:00 1.18 · high 2.01 · good 29.30 · good Poor
Mon 07:00 1.18 · high 2.75 · good 29.30 · good Poor
Mon 08:00 1.18 · high 2.79 · good 29.30 · good Poor
Mon 09:00 1.20 · high 3.08 · good 29.30 · good Poor
Mon 10:00 1.20 · high 3.51 · good 29.30 · good Poor
Mon 11:00 1.20 · high 3.55 · good 29.40 · good Poor
Mon 12:00 1.18 · high 3.65 · good 29.50 · good Poor
Mon 13:00 1.18 · high 3.58 · good 29.60 · good Poor
Mon 14:00 1.18 · high 3.47 · good 29.70 · good Fair
Mon 15:00 1.18 · high 3.37 · good 29.70 · good Fair
Mon 16:00 1.18 · high 3.51 · good 29.80 · good Fair
Mon 17:00 1.16 · high 3.00 · good 29.80 · good Fair
Mon 18:00 1.16 · high 2.16 · good 29.70 · good Fair
Mon 19:00 1.14 · high 1.95 · good 29.70 · good Poor
Mon 20:00 1.12 · high 1.40 · good 29.60 · good Poor
Mon 21:00 1.06 · high 1.43 · good 29.50 · good Poor
Mon 22:00 1.04 · high 1.54 · good 29.60 · good Poor
Mon 23:00 1.02 · high 1.52 · good 29.50 · good Poor
Tue 00:00 1.02 · high 1.19 · good 29.50 · good Poor
Tue 01:00 1.00 · high 1.17 · good 29.50 · good Poor
Tue 02:00 1.00 · high 0.32 · good 29.50 · good Poor
Tue 03:00 1.00 · high 0.28 · good 29.50 · good Poor
Tue 04:00 0.98 · high 0.35 · good 29.50 · good Poor
Tue 05:00 0.98 · high 0.35 · good 29.50 · good Poor
Tue 06:00 0.98 · high 0.32 · good 29.50 · good Poor
Tue 07:00 0.98 · high 0.51 · good 29.50 · good Poor
Tue 08:00 0.98 · high 0.61 · good 29.50 · good Poor
Tue 09:00 0.98 · high 1.43 · good 29.50 · good Poor
Tue 10:00 0.98 · high 2.17 · good 29.60 · good Fair
Tue 11:00 0.98 · high 2.39 · good 29.70 · good Fair
Tue 12:00 0.98 · high 2.34 · good 29.80 · good Fair
Tue 13:00 0.98 · high 2.41 · good 29.90 · good Fair
Tue 14:00 0.98 · high 2.73 · good 30.00 · good Fair
Tue 15:00 0.96 · high 2.21 · good 30.10 · good Fair
Tue 16:00 0.96 · high 2.09 · good 30.10 · good Fair
Tue 17:00 0.96 · high 0.57 · good 30.10 · good Fair
Tue 18:00 0.96 · high 0.43 · good 30.00 · good Fair
Tue 19:00 0.96 · high 0.16 · good 29.90 · good Poor
Tue 20:00 0.96 · high 0.11 · good 29.80 · good Poor
Tue 21:00 0.92 · high 0.70 · good 29.70 · good Poor
Tue 22:00 0.94 · high 0.68 · good 29.60 · good Poor
Tue 23:00 0.94 · high 0.41 · good 29.60 · good Poor
Wed 00:00 0.94 · high 0.05 · good 29.50 · good Poor
Wed 01:00 0.94 · high 0.53 · good 29.50 · good Poor
Wed 02:00 0.94 · high 1.05 · good 29.50 · good Poor
Wed 03:00 0.88 · high 0.29 · good 29.40 · good Poor
Wed 04:00 0.88 · high 0.32 · good 29.40 · good Poor
Wed 05:00 0.88 · high 0.43 · good 29.40 · good Poor
Wed 06:00 0.88 · high 0.47 · good 29.40 · good Poor
Wed 07:00 0.88 · high 1.35 · good 29.40 · good Poor
Wed 08:00 0.88 · high 1.35 · good 29.50 · good Poor
Wed 09:00 0.86 · high 0.96 · good 29.50 · good Poor
Wed 10:00 0.86 · high 0.32 · good 29.50 · good Fair
Wed 11:00 0.84 · high 1.01 · good 29.60 · good Fair
Wed 12:00 0.84 · high 1.06 · good 29.70 · good Fair
Wed 13:00 0.82 · high 1.97 · good 29.80 · good Fair
Wed 14:00 0.80 · high 2.38 · good 29.90 · good Fair
Wed 15:00 0.80 · high 1.65 · good 30.00 · good Fair
Wed 16:00 0.78 · high 2.20 · good 30.00 · good Fair
Wed 17:00 0.76 · high 1.50 · good 30.00 · good Fair
Wed 18:00 0.76 · high 0.65 · good 29.90 · good Fair
Wed 19:00 0.74 · high 0.90 · good 29.80 · good Poor
Wed 20:00 0.74 · high 1.38 · good 29.70 · good Poor
Wed 21:00 0.76 · high 1.59 · good 29.60 · good Poor
Wed 22:00 0.76 · high 1.15 · good 29.60 · good Poor