30-year climate normals

Martin County Climate and Weather Averages

Hottest month — August

90.8°

average daily high. The coldest month is January, averaging a low of 53.6°F.

Martin County gets 64.16" of precipitation a year, and 40% of it falls in Jun, Jul, Aug.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	73.7°	53.6°	3.17"
February	76.2°	54.8°	2.27"
March	78.5°	57.8°	3.95"
April	83.1°	61.6°	2.87"
May	85.9°	67.1°	5.73"
June	88.9°	71.5°	9.56"
July	90.3°	72.9°	7.00"
August	90.8°	73.9°	9.03"
September	88.5°	72.4°	9.17"
October	85.3°	68.3°	5.05"
November	79.2°	62.0°	3.44"
December	75.8°	56.7°	2.92"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 40% falling in the wettest three months (Jun, Jul, Aug).

January 3.17"

February 2.27"

March 3.95"

April 2.87"

May 5.73"

June 9.56"

July 7.00"

August 9.03"

September 9.17"

October 5.05"

November 3.44"

December 2.92"

Annual total 64.16"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 3,528

Heating degree days How much heating the climate demands 337

Approximate annual cooling cost At 15.17¢/kWh, Florida average $535

Approximate annual electric heating cost Lower where heating is gas rather than electric $18

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Martin County, where electricity is one line of eight.

Common questions

What is the weather like in Martin County?

Martin County averages a high of 90.8°F in August and a low of 53.6°F in January. Annual precipitation is 64.16 inches, with essentially no snow.

When is the rainy season in Martin County?

The wettest stretch is Jun, Jul, Aug, which accounts for 40% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Martin County?

The average daily high in August, the hottest month, is 90.8°F. That drives 3,528 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Martin County?

Effectively no. Measurable snowfall is rare in Martin County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PORT SALERNO 5W, FL US (USC00087304), 8.4 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Florida residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.