Weather & environment

The day, not just the temperature

Official alerts, heat, rain, wind, UV, modeled air quality and dust, tides, STT observations, regional earthquakes, and the tropical outlook—with sources and last-polled times.

St. John right nowpartial

Temperature80°

Rain chance30%

Humidity78%

WindE21mph

UV index0

Choose protected water or land activitiesFresh winds or strong gusts can make exposed bays and small boats uncomfortable.

Open-Meteo · polled 7:26 AM AST · fresh

Official forecast

What NWS San Juan expects

TodayWed 7:00 AM AST

85°

Haze

Rain: 4%
Wind: E 20 to 24 mph

TonightWed 6:00 PM AST

76°

Haze

Rain: 7%
Wind: E 21 to 24 mph

ThursdayThu 6:00 AM AST

85°

Haze

Rain: 3%
Wind: E 18 to 22 mph

Thursday NightThu 6:00 PM AST

75°

Haze

Rain: 20%
Wind: ENE 21 mph

FridayFri 6:00 AM AST

85°

Scattered Rain Showers

Rain: 30%
Wind: E 18 to 22 mph

Friday NightFri 6:00 PM AST

75°

Isolated Rain Showers

Rain: 20%
Wind: E 21 mph

NOAA / National Weather Service · polled 7:16 AM AST · fresh

Official + model outlook

Heat, UV, rain, and wind by day

85°76°7%Wed

85°75°20%Thu

85°75°30%Fri

85°75°20%Sat

85°75°30%Sun

85°75°30%Mon

85°75°30%Tue

Wed, Jul 29

85°76°

High NWS · low NWS

Rain · NWS: 7%
UV max · model: 8.3
Wind · NWS: E 20 to 24 mph
Gusts · model: 30 mph
Daylight · model: 5:56 AM–6:54 PM

Thu, Jul 30

85°75°

High NWS · low NWS

Rain · NWS: 20%
UV max · model: 7.2
Wind · NWS: E 18 to 22 mph
Gusts · model: 30 mph
Daylight · model: 5:56 AM–6:54 PM

Fri, Jul 31

85°75°

High NWS · low NWS

Rain · NWS: 30%
UV max · model: 9.1
Wind · NWS: E 18 to 22 mph
Gusts · model: 26 mph
Daylight · model: 5:56 AM–6:54 PM

Sat, Aug 1

85°75°

High NWS · low NWS

Rain · NWS: 20%
UV max · model: 9.1
Wind · NWS: E 20 mph
Gusts · model: 24 mph
Daylight · model: 5:57 AM–6:53 PM

Sun, Aug 2

85°75°

High NWS · low NWS

Rain · NWS: 30%
UV max · model: 9.1
Wind · NWS: E 14 to 18 mph
Gusts · model: 24 mph
Daylight · model: 5:57 AM–6:53 PM

Mon, Aug 3

85°75°

High NWS · low NWS

Rain · NWS: 30%
UV max · model: 8.9
Wind · NWS: E 15 to 18 mph
Gusts · model: 23 mph
Daylight · model: 5:57 AM–6:52 PM

Tue, Aug 4

85°75°

High NWS · low NWS

Rain · NWS: 30%
UV max · model: 8.8
Wind · NWS: E 12 to 15 mph
Gusts · model: 23 mph
Daylight · model: 5:58 AM–6:52 PM

Fresh NWS high, low, rain, and wind values replace the matching model field; UV, gusts, and daylight remain Open-Meteo model guidance. NOAA / National Weather Service · polled 7:16 AM AST · fresh · Open-Meteo · polled 7:26 AM AST · fresh. Official alerts still take priority.

Next 12 hours

Rain, heat, and wind by hour

Notable rain windowsConsecutive NWS hours at or above 40%.

No hour reaches 40% in the cached 24-hour forecastThis is not an all-clear; brief showers and official alerts still matter.

7 AM80°Haze

Rain: 1%
Humidity: 86%
Wind: E 20 mph

8 AM81°Haze

Rain: 1%
Humidity: 82%
Wind: E 21 mph

9 AM82°Haze

Rain: 4%
Humidity: 78%
Wind: E 22 mph

10 AM83°Haze

Rain: 4%
Humidity: 76%
Wind: E 23 mph

11 AM84°Haze

Rain: 4%
Humidity: 74%
Wind: E 24 mph

12 PM85°Haze

Rain: 0%
Humidity: 73%
Wind: E 24 mph

1 PM85°Haze

Rain: 0%
Humidity: 70%
Wind: E 23 mph

2 PM85°Haze

Rain: 0%
Humidity: 70%
Wind: E 23 mph

3 PM85°Haze

Rain: 0%
Humidity: 71%
Wind: E 22 mph

4 PM84°Haze

Rain: 0%
Humidity: 72%
Wind: E 22 mph

5 PM83°Haze

Rain: 0%
Humidity: 72%
Wind: E 22 mph

6 PM81°Haze

Rain: 1%
Humidity: 77%
Wind: E 21 mph

NOAA / National Weather Service hourly forecast · polled 7:12 AM AST · fresh

Current context

On island, on the water, and at STT

Current weather detail

Feels like: 81°F
Wind direction: E (100°)
Gusts: 27 mph
Current precipitation: 0.00 in

Open-Meteo model estimate. Official NWS alerts and forecasts take priority.

Modeled air quality and dust

55 AQIModerate

PM2.5: 8.1 µg/m³
PM10: 17.7 µg/m³
Surface dust: 12.0 µg/m³
Aerosol optical depth: 0.19

CAMS Global model via Open-Meteo · roughly 45 km resolution · fresh. Not a local monitor or an air-quality all-clear; official advisories take priority.

Lameshur Bay tide predictions

Low tideWed, Jul 29, 1:24 PM AST
-0.0 ft
High tideWed, Jul 29, 10:01 PM AST
1.0 ft

NOAA station 9751381 · predicted heights relative to MLLW · fresh.

STT airport weather

VFRVisual flight rules

Temperature: 85°F
Wind: E (100°) · 16 mph
Gusts: — mph
Visibility: 10+ mi

METAR TIST 291053Z 10014KT 10SM SCT020 29/06 A3002 RMK AO2 SLP166 T02940061 $

Observed Wed, Jul 29, 6:53 AM AST · fresh. METAR is weather context, not flight status.

Observed offshore

Sea south of St. John

No fresh buoy observation is available. Stale readings older than six hours are withheld.

Atlantic tropics

National Hurricane Center

No active tropical cyclonesCurrent NHC status feed.

Areas of showers and thunderstorms

No Atlantic areas highlightedNHC shows no organized showers and thunderstorms with formation potential.

NHC Tropical Weather Outlook ↗

Regional seismic activity

Recent M3+ USGS events

M 3.0

3 miles W of San Antonio, Puerto Rico

Wed, Jul 29, 6:28 AM AST · 60.1 mi deep · reviewed

USGS event ↗

M 3.6

24 miles NNW of San Antonio, Puerto Rico

Tue, Jul 28, 7:50 PM AST · 5.6 mi deep · reviewed

USGS event ↗

M 3.6

77 miles NNW of The Valley, Anguilla

Tue, Jul 28, 5:19 PM AST · 6.2 mi deep · reviewed

USGS event ↗

M 3.5

2 miles SSW of Indios, Puerto Rico

Tue, Jul 28, 1:59 PM AST · 7.5 mi deep · reviewed

USGS event ↗

M 3.8

14 miles SSE of La Romana, Dominican Republic

Tue, Jul 28, 2:46 AM AST · 63.4 mi deep · reviewed

USGS event ↗

Search centered on St. John within 311 miles · fresh.

Official coastal forecast

Waters around St. John

Today3–5 ft

East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Isolated showers.

Tonight4–6 ft

East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds.

Thursday4–6 ft

East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds.

Thursday Night4–5 ft

East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and east 2 feet at 5 seconds.

Friday4–5 ft

East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds.

Friday Night3–4 ft

East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds.

NWS zone AMZ726 · issued Wed 3:37 AM AST. This broad coastal forecast does not establish conditions inside a particular bay.

Interpretation

What matters on St. John

UV and heat

Tropical sun can become the limiting condition even on a beautiful day. Shift exposed activity earlier and treat shade and water as part of the plan.

Wind and water

Island-wide wind is context, not a beach verdict. Exposure, swell direction, local terrain, and operator guidance still decide whether water activity is appropriate.