Weather in Río San Juan

14-day forecast · updated today, Thursday, October 29, at 3:42 am (AST)

Now · partly cloudy 75 °F

Feels like: 85 °F
Low / high: 74 / 87 °F
Rain: 95% · 0.15 in
Wind: 2 mph SSE

→ 29.92 inHg · steady UV 8 · very high

Today in Río San Juan: heavy drizzle, 74 °F to 87 °F, with a 95% chance of rain (0.15 in) and a light air from the south-southeast (2 mph). Tomorrow, light showers, 73 °F to 87 °F and a 65% chance of rain. The warmest day of the week is Wednesday 4, at 89 °F.

Temperatures for the next 14 days

87° 74°
Today
87° 73°
Fri 30
87° 70°
Sat 31
82° 72°
Sun 1
85° 71°
Mon 2
88° 71°
Tue 3
89° 72°
Wed 4
87° 72°
Thu 5
87° 73°
Fri 6
87° 74°
Sat 7
86° 73°
Sun 8
87° 73°
Mon 9
85° 73°
Tue 10
87° 74°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Heavy drizzle	74 / 87 °F	95% · 0.15 in	8 mph SE	4.1 ft	11:10 am · 11:03 pm	ECMWF
Fri 30	Light showers	73 / 87 °F	65% · 0.20 in	5 mph SSE	3.2 ft	12:06 pm	ECMWF
Sat 31	Light drizzle	70 / 87 °F	79% · 0.09 in	7 mph ENE	3.0 ft	12:03 am · 1:05 pm	ECMWF
Sun 1	Light showers	72 / 82 °F	89% · 0.43 in	6 mph SE	3.0 ft	1:10 am · 2:04 pm	ECMWF
Mon 2	Drizzle	71 / 85 °F	78% · 0.17 in	6 mph SSE	3.4 ft	2:23 am · 3:04 pm	ECMWF
Tue 3	Light showers	71 / 88 °F	75% · 0.39 in	8 mph SSE	3.1 ft	3:36 am · 4:02 pm	ECMWF
Wed 4	Light showers	72 / 89 °F	88% · 0.53 in	6 mph SSW	3.1 ft	4:43 am · 4:58 pm	ECMWF
Thu 5	Light showers	72 / 87 °F	84% · 0.38 in	6 mph S	2.6 ft	5:43 am · 5:49 pm	ECMWF
Fri 6	Light drizzle	73 / 87 °F	78% · 0.07 in	5 mph S	2.6 ft	6:37 am · 6:38 pm	ECMWF
Sat 7	Light drizzle	74 / 87 °F	65% · 0.09 in	6 mph SE	2.5 ft	7:25 am · 7:23 pm	ECMWF
Sun 8	Light drizzle	73 / 86 °F	71% · 0.13 in	6 mph SE	2.7 ft	8:10 am · 8:06 pm	ECMWF
Mon 9	Drizzle	73 / 87 °F	62% · 0.27 in	6 mph SE	2.6 ft	8:52 am · 8:45 pm	ECMWF
Tue 10	Drizzle	73 / 85 °F	68% · 0.17 in	8 mph ESE	2.0 ft	9:32 am · 9:22 pm	ECMWF
Wed 11	Light drizzle	74 / 87 °F	63% · 0.08 in	7 mph SSE	2.9 ft	10:11 am · 9:58 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	Mainly clear	Partly cloudy	Partly cloudy	Heavy drizzle	Light drizzle	Partly cloudy	Mainly clear
Temperature	75°	75°	76°	81°	86°	81°	81°	76°
Chance of rain	0%	0%	0%	2%	34%	93%	75%	22%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.04 in	0.01 in	0.00 in	0.00 in
Wind (mph)	3 SSE	2 SSE	3 SSE	7 SSE	6 SE	6 ESE	4 ESE	1 SE
Humidity	98%	99%	97%	83%	72%	86%	87%	98%
UV	0	0	0	2	8	3	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	87°	87°	87°	82°	85°	88°	89°
AIFS	88°	89°	86°	84°	85°	88°	86°
GFS	91°	90°	87°	84°	87°	88°	83°
ICON	90°	88°	87°	87°	91°	91°	87°
Confidence	high	high	high	high	medium	high	medium

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0.15 in	0.20 in	0.09 in	0.43 in	0.17 in	0.39 in	0.53 in
AIFS	0.22 in	0.14 in	0.22 in	0.51 in	0.37 in	0.34 in	0.41 in
GFS	0.24 in	0.35 in	0.12 in	0.37 in	0.01 in	0.14 in	0.63 in
ICON	0.13 in	0	0.03 in	0.26 in	0.08 in	0.19 in	0.08 in
Confidence	high	medium	medium	high	medium	medium	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	821	513	716	618	619	821	618
AIFS	6	4	5	5	6	5	2
GFS	1113	119	1011	68	1115	812	76
ICON	612	814	1017	816	916	814	814
Confidence	high	medium	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	95%	65%	79%	89%	78%	75%	88%
GFS (GEFS, 31 scenarios)	87%	74%	39%	73%	54%	55%	57%

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, a bit drier and a warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	A bit above +1.3 °F	A bit below −38%	A bit above +1.6 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit above +2.2 °F	A bit below −49%	Above +2.0 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +2.0 °F	Normal	Above +2.2 °F	84° / 79°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.0 °F	A bit below −32%	Above +2.2 °F	84° / 79°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.2 °F	Normal	Above +2.2 °F	83° / 78°

Coming months

When	TemperatureTemp.	Rain	Sea
November	A bit above +2.3 °F	Normal	Above +2.2 °F
December	Above +2.9 °F	Normal	Above +2.5 °F
January	Above +2.9 °F	Normal	Above +2.5 °F
February	Above +2.7 °F	Normal	Above +2.2 °F
March	A bit above +2.3 °F	Normal	Above +2.0 °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.

Río San Juan climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Río San Juan is from February to March: highs of 84 °F to 86 °F, about 5 rainy days a month and 7 hours of sunshine a day.

Hurricane season: from August to October and in December, peaking in August. In the last 30 years (1996–2025), 18 tropical cyclones passed within 93 mi of Río San Juan, about 6 every 10 years; 8 of them with hurricane-force winds (74 mph or more). The most recent: Franklin, in August 2023.

83° 68°

JanJ
84° 68°

FebF
86° 69°

MarM
87° 70°

AprA
88° 72°

MayM
90° 73°

JunJ
90° 73°

JulJ
90° 73°

AugA
91° 73°

SepS
90° 73°

OctO
87° 71°

NovN
84° 69°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	83°	68°	5.45 in	7	6.6	79°	5.7 ft	–
FebruaryFeb	84°	68°	3.13 in	4	6.9	79°	5.7 ft	–
MarchMar	86°	69°	3.85 in	6	7.7	79°	5.6 ft	–
AprilApr	87°	70°	5.25 in	6	7.7	79°	4.8 ft	–
MayMay	88°	72°	6.81 in	8	7.3	80°	4.4 ft	–
JuneJun	90°	73°	3.67 in	5	8.3	82°	4.0 ft	–
JulyJul	90°	73°	4.93 in	6	8.3	82°	4.3 ft	1
AugustAug	90°	73°	5.82 in	7	7.8	83°	4.2 ft	7
SeptemberSep	91°	73°	4.87 in	8	7.5	84°	4.3 ft	6
OctoberOct	90°	73°	5.83 in	9	7.4	84°	4.5 ft	2
NovemberNov	87°	71°	10.39 in	10	6.5	83°	5.3 ft	–
DecemberDec	84°	69°	8.71 in	7	5.8	81°	5.6 ft	2

Month	Water	Waves	Cyclones
Jan	79°	5.7 ft	–
Feb	79°	5.7 ft	–
Mar	79°	5.6 ft	–
Apr	79°	4.8 ft	–
May	80°	4.4 ft	–
Jun	82°	4.0 ft	–
Jul	82°	4.3 ft	1
Aug	83°	4.2 ft	7
Sep	84°	4.3 ft	6
Oct	84°	4.5 ft	2
Nov	83°	5.3 ft	–
Dec	81°	5.6 ft	2

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

A normal year brings 68.73 in of rain on about 84 days and about 2,650 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

Now75 °Ffeels like 85 °F

Tomorrow73 / 87 °F

It's 75 °F now (feels like 85 °F). Today, 74 °F to 87 °F; tomorrow, 73 °F to 87 °F.

Chance of rain

Today 95% 0.15 in
Fri 30 65% 0.20 in
Sat 31 79% 0.09 in
Sun 1 89% 0.43 in
Mon 2 78% 0.17 in
Tue 3 75% 0.39 in
Wed 4 88% 0.53 in

Today the chance of rain reaches 95%, with 0.15 in in total. The next day with likely rain is Friday 30: 65% and 0.20 in.

Recent rain: last 24 hours, 0.06 in; last 3 days, 0.84 in; last 7 days, 0.99 in.

Humidity and dew point

Humidity100%

Dew point74 °F

Humidity is 100% now and the dew point is 74 °F. With a dew point this high, it feels muggy. The temperature is very close to the dew point: fog may form.

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

Clouds54%

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

Now0

Today's peak8very high

Fri 30: 9 · Sat 31: 8 · Sun 1: 8

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

29.9030.00 30.00

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

Air and pollen

Air qualityFair · 27

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	Drizzle	72 / 89 °F	0.08 in	8 mph SSE
Tue 27	Light showers	74 / 81 °F	0.37 in	9 mph SSE
Mon 26	Light showers	76 / 88 °F	0.39 in	12 mph SSE
Sun 25	Overcast	76 / 87 °F	0	13 mph SSE
Sat 24	Light drizzle	74 / 86 °F	0.09 in	9 mph ESE
Fri 23	Light drizzle	73 / 89 °F	0.02 in	10 mph SSE
Thu 22	Light drizzle	70 / 89 °F	0.04 in	8 mph S

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Drizzle	71 / 92 °F	0.08 in	8 mph SSW
Tue 20	Light showers	73 / 90 °F	0.30 in	7 mph SE
Mon 19	Light drizzle	74 / 89 °F	0.01 in	7 mph ESE
Sun 18	Light drizzle	74 / 88 °F	0.05 in	6 mph ESE
Sat 17	Light drizzle	74 / 88 °F	0.07 in	9 mph SE
Fri 16	Light drizzle	74 / 88 °F	0.09 in	8 mph E
Thu 15	Light drizzle	76 / 88 °F	0.07 in	9 mph ESE
Wed 14	Light drizzle	71 / 88 °F	0.05 in	7 mph SE
Tue 13	Thunderstorm	72 / 89 °F	0.60 in	7 mph SE
Mon 12	Light drizzle	73 / 87 °F	0.15 in	8 mph SE
Sun 11	Heavy drizzle	74 / 88 °F	0.28 in	11 mph SE
Sat 10	Drizzle	74 / 87 °F	0.27 in	10 mph E
Fri 9	Light drizzle	75 / 88 °F	0.05 in	12 mph ESE
Thu 8	Heavy drizzle	75 / 88 °F	0.15 in	10 mph SE
Wed 7	Light drizzle	73 / 90 °F	0.12 in	7 mph SE
Tue 6	Light drizzle	74 / 89 °F	0.01 in	7 mph SE
Mon 5	Light drizzle	72 / 90 °F	0.07 in	6 mph SE
Sun 4	Showers	72 / 82 °F	1.36 in	5 mph SSE
Sat 3	Heavy drizzle	74 / 83 °F	0.22 in	8 mph SE
Fri 2	Drizzle	74 / 89 °F	0.15 in	11 mph SE
Thu 1	Light drizzle	75 / 89 °F	0.06 in	12 mph ESE
Wed 30	Light drizzle	76 / 89 °F	0.09 in	11 mph ESE
Tue 29	Light drizzle	75 / 91 °F	0.02 in	11 mph ESE

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 Río San JuanQuestions

What's the weather like today in Río San Juan?

Heavy drizzle, from 74 °F to 87 °F, with a light air from the south-southeast (2 mph) and a 95% chance of rain.

Will it rain tomorrow in Río San Juan?

On Friday 30 the chance of rain is 65% (0.20 in): light showers.

How warm will it be this week?

Between a low of 70 °F and a high of 89 °F; the warmest day, Wednesday 4.

What's the UV index today?

It reaches 8 (very high). Avoid the midday sun; reflection off the water adds to it.

Is the pressure rising or falling?

It's 29.92 inHg and steady: −0.01 inHg over the last 24 hours.

When is the best time to visit Río San Juan?

The best time to visit Río San Juan is from February to March: highs of 84 °F to 86 °F, about 5 rainy days a month and 7 hours of sunshine a day.

What is the weather like in Río San Juan in October?

In October, Río San Juan normally sees highs of 90 °F and lows of 73 °F, with about 9 rainy days (5.83 in for the month) and 7 hours of sunshine a day. The sea is around 84 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Río San Juan?

The warmest is September, with average highs of 91 °F, and the coldest January, with lows of 68 °F. The wettest is November (10.39 in) and the driest, February.

When is hurricane season in Río San Juan?

Hurricane season: from August to October and in December, peaking in August. In the last 30 years (1996–2025), 18 tropical cyclones passed within 93 mi of Río San Juan, about 6 every 10 years; 8 of them with hurricane-force winds (74 mph or more). The most recent: Franklin, in August 2023.

More about Río San Juan today

Weather near Río San Juan

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 11 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 3:42 am (local time).

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