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Shaded-relief map of Guaynabo, Puerto Rico: rivers, roads, the city limits and where the water drains.
PUERTO RICO · GUAYNABO MUNICIPIO

Guaynabo

68,491 people, 150 ft above sea level in Guaynabo Municipio.

150 ftElevation, city center
68,491People, 2024 estimate
12 sq miLand area
Sunny 89°
Sunny now Dew point 73° · SSE 9 mph · high 86°
City of Guaynabo River Interstate 2 miles
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The Guaynabo plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Guaynabo

NWS forecast and National Blend of Models · updated 4:00 PM AST
RIGHT NOW Luis Munoz Marin International Airport (TJSJ) · 4:56 PM
Sunny
89° Sunny Feels like 97° · high of 86° near 5 PM
WindSSE 9 mphno gusts
Humidity59%rising to 85% by morning
Pressure29.96 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 73° · Oppressiveabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Showers
Tonight, around midnightin about 7 hours · 31% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINNov. 90.06 in · 5 dry days
ALERTS & OUTLOOKS
No watches or warnings for Guaynabo Municipio
NWS San Juan and the Storm Prediction Center · checked 5:17 PM
SUN & MOON
↑ 6:30 AM5:47 PM ↓
11 h 17 m of daylight, 1 minute less than yesterday
Waxing crescent, 25% lit. Next full moon: Nov. 24.
AIR & POLLEN
52
MODERATEAir quality index · fine particles
No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
partly cloudy night
mostly clear night
showers night
mostly cloudy night
mostly cloudy night
mostly cloudy day
mostly cloudy day
mostly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
mostly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
showers night
showers night
showers day
showers day
showers day
TEMPERATURE °F
86°
79°
90°
78°
88°
80°
CHANCE OF RAIN
75% · 0.08 in Tuesday afternoon 50%
WIND, MPH
12
8
8
7
7
8
9
10
9
7
5
4
4
7
11
11
10
9
8
8
8
10
12
11
HOW IT FEELS · DEW POINT
Oppressive: dew points 72 to 75°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 86° / 75°
SAT Nov. 14 Mostly sunny Mostly sunny
86° 79°
0% rain — SSE 13 A
SUN Nov. 15 Chance of showers; hot Chance of showers; hot
90° 78°
30% rain — SE 9 C
MON Nov. 16 Partly cloudy; hot Partly cloudy; hot
90° 79°
30% rain — E 9 A
TUE Nov. 17 Showers likely; hot Showers likely; hot
90° 78°
80% rain up to 0.2″ E 10 A
WED Nov. 18 Showers likely Showers likely
89° 77°
80% rain up to 0.2″ ESE 8 A
THU Nov. 19 Chance of showers; hot Chance of showers; hot
90° 77°
50% rain up to 0.05″ ESE 7 A
FRI Nov. 20 Chance of showers; hot Chance of showers; hot
90° 77°
50% rain up to 0.05″ SE 6 A
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Guaynabo about 5,000 feet above the ground was over the tropical Atlantic three days ago, about 950 miles back along its path. Air off the water carries moisture, which is why it feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

THIS WEEK IN 1983 Nov. 12, 1983

The hottest this week has been

93° on Nov. 12, 1983, the hottest reading for this week of the year since 1898. Next is 92° in 1981.

92°
93°
19811983
Source: NOAA RCC-ACIS, the San Juan Area threaded record since 1898.
MILE2
THE GROUND

What Guaynabo stands on

Guaynabo’s center stands about 150 ft above sea level. Within three miles the land runs from 50 ft to 770 ft, a difference of 720 ft: hilly country. The highest named summit within 15 miles is Cerro Las Piñas, about 2,410 ft, 14 miles south.

Guaynabo, cut in half from southwest to northeast

A section southwest to northeast, 24 miles through the town center
0 ft500 ft1,000 ft1,500 ft GUAYNABO150 ftHigh point of the line1,920 ftCerro Mula1,530 ftMontes de San Patricio280 ft ← SW · Rodríguez HeviaNE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR.
MILE5
THE ALMANAC

Guaynabo’s year

1991–2020 normals · records since 1898 · San Juan L M Marin International Airport, 8 mi northeast

Guaynabo has a tropical monsoon climate. Summer afternoons average 89° in June; winter nights fall to about 72° in January. About 60 inches of rain fall in a normal year.

83°72°84°72°85°72°86°74°87°76°89°77°89°78°89°78°89°78°89°77°86°75°84°73° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1 TODAY GUAYNABO 59.9 in rain a year
Normal high to low, by month Record high to low, by day Rain by month
June, average89° / 77°high / low, the warmest month
January, average83° / 72°high / low, the coldest month
Rain a year59.9 inwettest months: November and September
Hottest on record98°FOctober 9, 1981
Coldest on record60°FMarch 3, 1957
Wettest day on record9.67 inAugust 15, 1944
90° days a year72none reach 100°
Climate typeTropical monsoonKöppen Am

AROUND THE RING

1Wettest stretchSeptember through November: 19.1 of the year’s 59.9 inches
NOVEMBER 14 IN THE RECORD

On November 14 Guaynabo normally reaches 86° and falls to 75°. The record high is 92°, in 1981; the record low 68°, in 1961. The most rain on this date, 1.54 in, fell in 1948.

MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high83°84°85°86°87°89°89°89°89°89°86°84°
Normal low72°72°72°74°76°77°78°78°78°77°75°73°
Rain, inches4.072.582.184.605.544.666.026.296.505.217.374.85
Record high92° (1983)96° (1983)96° (1983)97° (1983)96° (1980)97° (1988)95° (1981)97° (1980)97° (1981)98° (1981)96° (1981)94° (1989)
Record low61° (1962)62° (1968)60° (1957)64° (1968)66° (1962)66° (1909)69° (1959)68° (1904)69° (1960)67° (1959)65° (1898)62° (1917)

Normals 1991–2020 and records since 1898 from the San Juan Area threaded record (San Juan L M Marin International Airport, 8 miles northeast, 140 ft lower). NOAA, through RCC-ACIS.
MILE7
ON THE NETWORK

Around Guaynabo on the Forecast Network

Neighboring plates

Bayamón PR · 3 MI 3 miles west San Juan PR · 4 MI 4 miles northeast Ponce PR · 43 MI 43 miles southwest Mayagüez PR · 69 MI 69 miles west
FORECASTCITY
Map of Guaynabo, Puerto Rico. Explore the plate
PUERTO RICO · GUAYNABO

Guaynabo

68,491 people, 150 ft above sea level in Guaynabo Municipio.

150 ftElevation
68,491People
12 sq miLand
Sunny 89°
SunnyDew point 73°
1

Today in Guaynabo

NEXT 15 HOURS
Now mostly sunny 86° 0%
8p mostly clear night 82° 0%
11p partly cloudy night 82° 0%
2a mostly cloudy night 81° 0%
5a mostly cloudy night 79° 0%
8a mostly cloudy day 82° 0%
Showers
NEXT RAINTonight around midnight · 31%
→
Sat0%
Mostly sunny Mostly sunny
79
86
A
Sun30%
Chance of showers; hot Chance of showers; hot
78
90
C
Mon30%
Partly cloudy; hot Partly cloudy; hot
79
90
A
Tue80%
Showers likely; hot Showers likely; hot
78
90
A
Wed80%
Showers likely Showers likely
77
89
A
Thu50%
Chance of showers; hot Chance of showers; hot
77
90
A
Fri50%
Chance of showers; hot Chance of showers; hot
77
90
A
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK IN 1983 · NOV. 12, 1983

93°, the hottest this week of the year has been since 1898.

2

What Guaynabo stands on

Guaynabo’s center stands about 150 ft above sea level. Within three miles the land runs from 50 ft to 770 ft, a difference of 720 ft: hilly country. The highest named summit within 15 miles is Cerro Las Piñas, about 2,410 ft, 14 miles south.

Guaynabo, southwest to northeast Guaynabo150 ftMontes de San Patricio280 ft ← SWNE → 24 miles through the town center; vertical exaggeration about 19×.
Elevation, center150 ft
Within 3 miles50 to 770 ft
Lie of the landHilly (720 ft of relief)
High point nearbyCerro Las Piñas, 2,410 ft, 14 mi south
5

Guaynabo’s year

Guaynabo has a tropical monsoon climate. Summer afternoons average 89° in June; winter nights fall to about 72° in January. About 60 inches of rain fall in a normal year.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1 59.9 in
June, average89° / 77° · high / low, the warmest month
January, average83° / 72° · high / low, the coldest month
Rain a year59.9 in · wettest months: November and September
Hottest on record98°F · October 9, 1981
Coldest on record60°F · March 3, 1957
Wettest day on record9.67 in · August 15, 1944
90° days a year72 · none reach 100°
Climate typeTropical monsoon · Köppen Am
1Wettest stretch · September through November: 19.1 of the year’s 59.9 inches
NOVEMBER 14 IN THE RECORD

On November 14 Guaynabo normally reaches 86° and falls to 75°. The record high is 92°, in 1981; the record low 68°, in 1961. The most rain on this date, 1.54 in, fell in 1948.

Normals 1991–2020 and records since 1898 from the San Juan Area threaded record (San Juan L M Marin International Airport, 8 miles northeast, 140 ft lower). NOAA, through RCC-ACIS.