Home › Cities › United States › Florida › Port Saint Lucie

Port Saint Lucie, Florida climate

Cfa Humid subtropical

Port Saint Lucie has a mildly seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 89°F, while the coldest is January averaging around 53°F at night. Around 56 inches of precipitation falls each year, peaking in September (8.2 inches) and easing off in December (2.4 inches).

☀️ Summers

Hot

Highs near 89°F in August.

About 69 days a year above 90 °F

❄️ Winters

Mild

Lows near 53°F in January.

About 1 freezing nights a year

🌧️ Rain

Wet

About 56 in of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.1 °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

Port Saint Lucie climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	72	74	77	81	84	88	89	89	88	84	78	74
Avg temp (°F)	63	65	68	72	77	80	82	82	81	77	70	66
Avg low (°F)	53	55	59	64	69	73	74	75	74	70	62	57
Precipitation (in)	3.0	2.8	3.0	3.6	4.2	6.2	6.2	7.3	8.2	5.7	3.2	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	72	74	77	81	84	88
Avg temp (°F)	63	65	68	72	77	80
Avg low (°F)	53	55	59	64	69	73
Precipitation (in)	3.0	2.8	3.0	3.6	4.2	6.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	89	88	84	78	74
Avg temp (°F)	82	82	81	77	70	66
Avg low (°F)	74	75	74	70	62	57
Precipitation (in)	6.2	7.3	8.2	5.7	3.2	2.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	7	7	7	9	14	13	15	15	12	10	8
Days with high ≥ 90°F (days)	—	—	0.5	1	5	11	18	20	10	3	0.1	0.0
Days with low ≤ 32°F (days)	0.5	0.2	0.1	—	—	—	—	—	—	—	—	0.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	7	7	7	9	14
Days with high ≥ 90°F (days)	—	—	0.5	1	5	11
Days with low ≤ 32°F (days)	0.5	0.2	0.1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	13	15	15	12	10	8
Days with high ≥ 90°F (days)	18	20	10	3	0.1	0.0
Days with low ≤ 32°F (days)	—	—	—	—	—	0.3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	49	45	44	46	59	56	56	58	48	46	49
Clear days (≤ 30% cloud)	9	8	11	11	11	5	6	6	6	11	10	10
Partly cloudy days (30–70%)	13	13	12	12	13	14	16	16	12	11	13	13
Cloudy days (≥ 70%)	9	7	7	6	7	11	10	9	12	9	7	9
Relative humidity (%)	79	77	73	71	71	79	81	83	84	81	80	81
Wind speed (mph)	6.4	6.4	6.8	6.6	6.0	4.7	4.0	4.2	4.9	5.9	6.3	6.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	50	49	45	44	46	59
Clear days (≤ 30% cloud)	9	8	11	11	11	5
Partly cloudy days (30–70%)	13	13	12	12	13	14
Cloudy days (≥ 70%)	9	7	7	6	7	11
Relative humidity (%)	79	77	73	71	71	79
Wind speed (mph)	6.4	6.4	6.8	6.6	6.0	4.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	56	56	58	48	46	49
Clear days (≤ 30% cloud)	6	6	6	11	10	10
Partly cloudy days (30–70%)	16	16	12	11	13	13
Cloudy days (≥ 70%)	10	9	12	9	7	9
Relative humidity (%)	81	83	84	81	80	81
Wind speed (mph)	4.0	4.2	4.9	5.9	6.3	6.0

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at FT Pierce (NOAA GHCN station USC00083207), about 16 km from the city centre.

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 →