Bayamón, Puerto Rico climate

Am Tropical monsoon

Bayamón has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is August with an average daily high near 89°F, while the coldest is January averaging around 72°F at night. Around 60 inches of precipitation falls each year, peaking in November (7.4 inches) and easing off in March (2.2 inches).

☀️ All year

Hot

Daytime highs near 89°F most of the year.

About 72 days a year above 90 °F

🌙 Nights

Stays warm

Even the coolest nights stay near 72°F.

🌧️ Rain

Wet

About 60 in of rain a year.

Wettest in November

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.2 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Bayamón climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	83	84	85	86	88	89	89	89	89	89	86	84
Avg temp (°F)	78	78	79	80	82	83	83	83	83	83	81	79
Avg low (°F)	72	72	72	74	76	77	78	78	78	77	75	73
Precipitation (in)	4.1	2.6	2.2	4.6	5.5	4.7	6.0	6.3	6.5	5.1	7.4	4.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	83	84	85	86	88	89
Avg temp (°F)	78	78	79	80	82	83
Avg low (°F)	72	72	72	74	76	77
Precipitation (in)	4.1	2.6	2.2	4.6	5.5	4.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	89	89	89	86	84
Avg temp (°F)	83	83	83	83	81	79
Avg low (°F)	78	78	78	77	75	73
Precipitation (in)	6.0	6.3	6.5	5.1	7.4	4.9

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	18	15	13	14	17	15	19	20	18	18	21	20
Days with high ≥ 90°F (days)	0.1	0.8	2	4	7	12	10	13	13	10	2	0.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	18	15	13	14	17	15
Days with high ≥ 90°F (days)	0.1	0.8	2	4	7	12

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	19	20	18	18	21	20
Days with high ≥ 90°F (days)	10	13	13	10	2	0.5

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	56	56	57	56	67	64	61	59	63	59	59	55
Clear days (≤ 30% cloud)	4	3	3	4	2	3	3	3	3	4	4	4
Partly cloudy days (30–70%)	20	19	20	18	14	14	17	18	16	16	17	20
Cloudy days (≥ 70%)	7	6	7	8	15	13	11	10	11	11	10	7
Relative humidity (%)	78	76	74	75	78	79	79	79	80	81	81	79
Wind speed (mph)	9.3	9.4	8.9	8.7	8.6	9.2	9.9	9.2	7.9	7.4	8.3	9.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	56	56	57	56	67	64
Clear days (≤ 30% cloud)	4	3	3	4	2	3
Partly cloudy days (30–70%)	20	19	20	18	14	14
Cloudy days (≥ 70%)	7	6	7	8	15	13
Relative humidity (%)	78	76	74	75	78	79
Wind speed (mph)	9.3	9.4	8.9	8.7	8.6	9.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	61	59	63	59	59	55
Clear days (≤ 30% cloud)	3	3	3	4	4	4
Partly cloudy days (30–70%)	17	18	16	16	17	20
Cloudy days (≥ 70%)	11	10	11	11	10	7
Relative humidity (%)	79	79	80	81	81	79
Wind speed (mph)	9.9	9.2	7.9	7.4	8.3	9.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at San Juan L M Marin Intl AP, a weather station, about 16 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →