Port St. John, Florida Weather
Fireflies pulse through the magnolias. Day 78 of spring. Read this microseason across nine climate regions →
Port St. John weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Light Drizzle——81°70°—
- SaturdayJun 6Overcast——84°71°+3°
- SundayJun 7Overcast——89°68°+5°
- MondayJun 8Overcast13%—91°72°+2°
- TuesdayJun 9Light Drizzle34%—90°75°-1°
- WednesdayJun 10Light Drizzle37%—89°74°-1°
- ThursdayJun 11Drizzle47%0.12″81°73°-8°
AQI 44 (Good), driven by PM2.5. AQI down 5 over the last 6 hours (steady decline since this morning). PM2.5 at 8.4 µg/m³ (AQI 47) with a 0.60 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 42 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 13 by mid-afternoon.
- Present
- AQI 42
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 8.4 µg/m³ (AQI 47) with a 0.60 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.60
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 3:56 AM
- Moonset
- 2:53 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Port St. John at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: February 6 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.