Bayamón, Puerto Rico Weather
August opens — storms become routine. Day 43 of summer. Read this microseason across nine climate regions →
Bayamón weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Thunderstorm63%0.03″92°79°—
- MondayAug 3Overcast17%—92°78°0°
- TuesdayAug 4Drizzle94%0.02″89°76°-3°
- WednesdayAug 5Thunderstorm92%0.05″88°76°-1°
- ThursdayAug 6Thunderstorm79%0.04″90°76°+2°
- FridayAug 7Thunderstorm59%0.09″89°76°-1°
- SaturdayAug 8Light Drizzle47%0.05″92°78°+3°
AQI 26 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.7 µg/m³ (AQI 43), ratio 0.57 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 7.7 µg/m³ (AQI 43), ratio 0.57 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.57
- Wind
- light
- Recent rain
- 1h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
Red sky at night, sailor's delight.
- Moonrise
- 9:01 PM
- Moonset
- 9:23 AM
- In sign
- ♓︎ Pisces
August opens — storms become routine
Bayamón at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: December 7 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
16-Day Forecast — Bayamón
- Sun92°79°63%
- Mon92°78°17%
- Tue89°76°94%
- Wed88°76°92%
- Thu90°76°79%
- Fri89°76°59%
- Sat92°78°47%
- Sun90°78°66%
- Mon83°78°77%
- Tue91°78°71%
- Wed90°78°66%
- Thu91°77°68%
- Fri93°79°55%
- Sat93°80°43%
- Sun89°76°50%
- Mon97°74°48%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Bayamón
Right now in the garden
Peak growing season
As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Sun & seasons in Bayamón
Bayamón sits in Bayamón County, where the year’s longest day runs 13h 14m of daylight and its shortest just 11h 1m — a swing of +2h 13m between the June and December solstices.
San Juan, the state’s largest city, lies about 7 miles to the E. The nearest town Bayamón tracks is San Juan, roughly 7 miles to the E.
Microseason · August 1–5
August opens — storms become routine
Great rains fall without warning. Flash floods recede in hours. Mangrove prop roots strain. Corals bleach if water temp exceeds 30.5°C. Named storm threat real.
Day 214 of 365 · Wedge 43 of 72
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| April | tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | — | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
Bayamón peaks at about 81°F in July and bottoms near 75°F in January; October brings the heaviest rain (4.5 inches) and February the least (1.2 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 75° | 1.6″ | 28 |
| February | 75° | 1.2″ | 26 |
| March | 76° | 1.6″ | 26 |
| April | 77° | 2.6″ | 27 |
| May | 79° | 3.9″ | 30 |
| June | 81° | 2.5″ | 28 |
| July | 81° | 2.4″ | 30 |
| August | 81° | 3.5″ | 30 |
| September | 81° | 4.1″ | 29 |
| October | 79° | 4.5″ | 31 |
| November | 78° | 3.6″ | 29 |
| December | 76° | 2.6″ | 30 |
Regional context
Drawing on NOAA NCEI 1991-2020 normals, Bayamón's January averages 75°F and July 81°F — 6°F apart — while precipitation totals roughly 34.2 inches over some 343 days.
Bayamón's rain peaks in summer: October brings 4.5 inches over 30.7 thunderstorm-fed days, while February sees just 1.2 inches across 25.5 days under cooler, drier air. It is a warm-season-wet pattern Bayamón shares with places like Guaynabo, PR, Sabana Seca, PR and Mucarabones, PR.
Bayamón rarely sees a hard freeze — its coldest month sits near 75°F — so planting spans most of the calendar. Heat peaks in July around 81°F, which confines cool-season crops to the shoulders of summer. Across Bayamón, elevation and tree cover drive a 4-7°F spread in Bayamón's overnight lows.
Similar climates: Guaynabo, PR, Sabana Seca, PR, Mucarabones, PR, Pájaros, PR, Candelaria, PR.
Naturalist notes
May brings the peak migration of warblers through Puerto Rico, with species like the Black-throated Blue Warbler passing through on their journey north.
Flamboyán trees begin their spectacular flowering display in late May, painting the landscape with brilliant orange-red blooms.
Frequently asked
- When does it freeze in Bayamón?
- Frost typically leaves Bayamón by mid-February and returns to Bayamón near mid-December.
- What is the rainy season in Bayamón?
- Rainfall in Bayamón peaks in October near 4.5 inches, out of about 34 inches annually.
- What is the warmest month in Bayamón?
- On average July tops the year in Bayamón at about 81°F.
- What is the coldest month in Bayamón?
- The coldest stretch in Bayamón falls in January, around 75°F on average.
- When can I start a vegetable garden in Bayamón?
- Hardy spring crops go in near mid-February in Bayamón; tender peppers and squash wait 10–14 days.
- How many rainy days does Bayamón get?
- Bayamón averages about 343 days with measurable rain or snow each year.
- What hardiness zone is Bayamón?
- Since January in Bayamón averages 75°F, Bayamón's USDA zone follows that floor — confirm it by ZIP.
- What is the 10-day forecast for Bayamón?
- Bayamón's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Bayamón?
- See this week's day-by-day rain chances for Bayamón in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Bayamón?
- Current conditions for Bayamón and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Bayamón forecast updated?
- The Bayamón forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Bayamón?
- Today's sunrise and sunset times for Bayamón are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Bayamón?
- The next few days in Bayamón's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Climate
The varied climate of Bayamón, Puerto Rico carries typical Januarys near 75°F and Julys around 81°F — 6°F of seasonal travel.
In a typical year Bayamón records about 34 inches of precipitation on around 343 days.
From 18.4°N, Bayamón sees a 6°F seasonal swing that governs Bayamón's planting and frost windows.
ZIP codes in Bayamón
- 00959
- 00957
- 00956
- 00934
- 00960
- 00961
- 00916