Weather in Bayamón, Puerto Rico
Flowers spill across the islands. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 17Drizzle97%88°76°
- MondayMay 18Light Drizzle67%89°75°
- TuesdayMay 19Light Drizzle67%90°73°
- WednesdayMay 20Drizzle76%85°73°
- ThursdayMay 21Light Drizzle58%87°73°
- FridayMay 22Drizzle64%89°73°
- SaturdayMay 23Light Drizzle85%87°75°
- PM 2.5
- 8.5 μg/m³
- PM 10
- 16.1 μg/m³
- NO₂
- 0.7 μg/m³
- Ozone
- 45.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 10:13 AM
- Moonset
- —
- In sign
- ♊︎ Gemini
Flowers spill across the islands
Bayamón at a glance
- Today vs. normal: 16°F below the seasonal normal for this latitude
- Last frost: December 7 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Peak growing season
As of May 17, 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.
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
August brings Bayamón's peak heat with mean temperatures around 85°F, while January delivers the year's coolest weather at roughly 69°F. September marks the wettest period with 8.2 inches of rainfall, contrasting sharply with February's dry spell of just 2.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 69° | 2.1″ | 7 |
| February | 71° | 2.0″ | 7 |
| March | 73° | 2.2″ | 7 |
| April | 77° | 3.3″ | 11 |
| May | 80° | 4.8″ | 16 |
| June | 83° | 7.9″ | 25 |
| July | 84° | 5.8″ | 19 |
| August | 85° | 6.9″ | 23 |
| September | 83° | 8.2″ | 25 |
| October | 81° | 7.9″ | 25 |
| November | 76° | 3.3″ | 11 |
| December | 72° | 2.5″ | 8 |
Regional context
Climate conditions in Bayamón align with a broader regional pattern, sharing temperature ranges and seasonal characteristics with surrounding cities that experience similar growing conditions.
Similar climates: San Juan, PR, Aguadilla, PR, Carolina, PR, Arecibo, PR, Ponce, 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?
- Spring's final frost in Bayamón typically occurs around mid-February, while the first fall frost returns around mid-December.
- What is the rainy season in Bayamón?
- September stands as the wettest month, delivering approximately 8.2 inches of rain, contributing to the city's annual total of roughly 57 inches.
- What is the warmest month in Bayamón?
- August typically records the year's highest temperatures, with averages reaching about 85°F.
- What is the coldest month in Bayamón?
- January typically brings the coolest weather, with temperatures averaging about 69°F.
- When can I start a vegetable garden in Bayamón?
- Cool-season vegetables like peas and lettuce can be planted around the last spring frost in mid-February, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after that date.
- How many rainy days does Bayamón get?
- Bayamón experiences approximately 184 rainy days annually.
- What hardiness zone is Bayamón?
- Bayamón's USDA hardiness zone depends on average minimum winter temperatures; consult the USDA's online zone finder using the city ZIP code for current designation.
Climate
Bayamón, Puerto Rico experiences a climate with distinct seasonal variation. Temperatures hover near 69°F in January and climb to an average of 84°F in July, creating a 15°F seasonal swing.
Annual precipitation totals about 57 inches, distributed across roughly 184 rainy days throughout the year.
Geographic factors shape the local weather patterns: latitude at 18.4°N, nearby water bodies, and elevation all influence plant growth cycles, frost likelihood, and daily weather conditions.