As of 00:31 EDT

Weather in Port St. John, FL

82°

Port St. John, Sunday, 9 August, 00:31

Overcast. Feels like 91°. High 91°, low 76°.

Pressure30.09 inHg

Wind5 mph SE

Humidity89%

Visibility6.2 mi

Dew point78°

See detailed hourly forecast

Mon, 1095° / 76°

95 °

Port St. John, Monday, 10 August

Overcast. High 95°, low 76°.

Pressure30.15 inHg

Wind5.7 mph SE

Humidity48%

Visibility6.2 mi

Dew point71°

Tue, 1198° / 76°

0.01

98 °

Port St. John, Tuesday, 11 August

Light rain. High 98°, low 76°.

Pressure30.12 inHg

Wind1 mph S

Humidity44%

Visibility6.2 mi

Dew point72°

Wed, 1298° / 78°

0.01

98 °

Port St. John, Wednesday, 12 August

Light rain. High 98°, low 78°.

Pressure30.03 inHg

Wind6.7 mph SW

Humidity45%

Visibility6.2 mi

Dew point71°

Thu, 13100° / 78°

0.01

100 °

Port St. John, Thursday, 13 August

Light rain. High 100°, low 78°.

Pressure30.00 inHg

Wind7.7 mph SE

Humidity32%

Visibility—

Dew point63°

Fri, 1497° / 78°

97 °

Port St. John, Friday, 14 August

Overcast. High 97°, low 78°.

Pressure30.12 inHg

Wind9.9 mph SE

Humidity39%

Visibility—

Dew point66°

Sat, 1599° / 77°

99 °

Port St. John, Saturday, 15 August

Overcast. High 99°, low 77°.

Pressure30.12 inHg

Wind9.4 mph SE

Humidity37%

Visibility—

Dew point66°

Sun, 1691° / 77°

0.16

91 °

Port St. John, Sunday, 16 August

Light rain. High 91°, low 77°.

Pressure30.09 inHg

Wind7.4 mph E

Humidity55%

Visibility—

Dew point71°

Mon, 1793° / 76°

93 °

Port St. John, Monday, 17 August

Light rain. High 93°, low 76°.

Pressure30.09 inHg

Wind10.2 mph NE

Humidity44%

Visibility—

Dew point66°

Tue, 1899° / 76°

0.28

99 °

Port St. John, Tuesday, 18 August

Rain. High 99°, low 76°.

Pressure30.03 inHg

Wind7.7 mph E

Humidity39%

Visibility—

Dew point67°

Wed, 1998° / 73°

1.04

98 °

Port St. John, Wednesday, 19 August

Rain. High 98°, low 73°.

Pressure29.94 inHg

Wind9.6 mph N

Humidity41%

Visibility—

Dew point66°

Thu, 2097° / 72°

0.16

97 °

Port St. John, Thursday, 20 August

Rain. High 97°, low 72°.

Pressure29.85 inHg

Wind11.4 mph W

Humidity47%

Visibility—

Dew point70°

Fri, 21105° / 81°

0.02

105 °

Port St. John, Friday, 21 August

Light rain. High 105°, low 81°.

Pressure29.83 inHg

Wind11.1 mph W

Humidity39%

Visibility—

Dew point72°

Sat, 2297° / 80°

97 °

Port St. John, Saturday, 22 August

Clear. High 97°, low 80°.

Pressure29.97 inHg

Wind10.6 mph NE

Humidity44%

Visibility—

Dew point70°

Sun, 2394° / 80°

94 °

Port St. John, Sunday, 23 August

Overcast. High 94°, low 80°.

Pressure30.06 inHg

Wind10.8 mph E

Humidity48%

Visibility—

Dew point70°

Mon, 2495° / 78°

95 °

Port St. John, Monday, 24 August

Partly cloudy. High 95°, low 78°.

Pressure30.06 inHg

Wind9.3 mph E

Humidity41%

Visibility—

Dew point65°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Port St. John, FL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Port St. John, FL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.