Climate averages 1991–2020

Arecibo weather
in January.

A hot, moderately wet month: one of the coolest and the 2nd driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 28.3°C Daytime mean, January

Average low 21.5°C Night-time mean, January

Rainfall 41 mm 10 days with ≥1 mm

Daylight 11 h Sunrise to sunset, per day

January is a hot month in Arecibo: daytime highs average 28.3°C and nights cool to about 21.5°C. By daytime temperature it is one of the coolest months of the year.

Expect about 41 mm of rain on roughly 10 days, which makes January a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 09 min on an average January day.

The nearest other city in this atlas is Ponce (52 km away). In January its highs average 28.0°C, about as warm as Arecibo, with 22 mm of rain.

Among the 7 cities listed in Puerto Rico, Arecibo ranks 2nd of 7 for the warmest January highs and 6th of 7 for the driest January (rainfall, lowest first). The mean January high of those 7 cities is 28.0°C; Arecibo is 0.4°C warmer than that mean.

From January to February, average highs rise by 0.7°C to 29.0°C, and monthly rainfall falls from 41 mm to 37 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Arecibo climate table

1991–2020

Monthly climate averages for Arecibo, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	28.3°C21.5°C	21.5°C	41	9.5	11.211 h
February	29.0°C21.3°C	21.3°C	37	8.2	11.512 h
March	29.6°C21.4°C	21.4°C	59	9.9	12.012 h
April	29.9°C22.2°C	22.2°C	107	13.7	12.613 h
May	30.4°C23.3°C	23.3°C	165	18.3	13.013 h
June	31.5°C24.3°C	24.3°C	92	13.8	13.213 h
July	31.7°C24.6°C	24.6°C	79	14.8	13.113 h
August	31.7°C24.7°C	24.7°C	101	19.6	12.813 h
September	31.2°C24.4°C	24.4°C	154	22.3	12.312 h
October	30.4°C24.0°C	24.0°C	138	21.3	11.712 h
November	28.9°C23.1°C	23.1°C	113	17.4	11.311 h
December	28.3°C22.1°C	22.1°C	48	11.4	11.011 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from Arecibo

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Arecibo) is explained once on the Arecibo year overview and on the Sources, method and limits page.