Port St. John Weather Forecast 15 Days, Weather in Port St. John Today
Current weather conditions and 15 day weather forecast for Port St. John, Florida, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Port St. John
| 21 September 2026 Monday 25.5 ° C / 77.9°F  Cloudy |
Feels Like : 28.2 ° C / 82.8°F Humidity : % 79 Pressure : 1013 mb Wind Speed : 6.5 kmph / 4 miles from E  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 77 |
15 day weather forecast for Port St. John, FL, USA
Weather Forecast for next 15 Days for Port St. John including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Port St. John, Florida state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 September 2026 Sunday |  Overcast |
24.1 ° C (75.3°F) |
31.8 ° C (89.2°F) |
27.1 ° C (80.7°F) |
% 73 | 68% | 9.2 | Sunrise:07:10 AM Sunset: 07:22 PM |
Moonrise:04:08 PM Moonset: 01:40 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday |  Patchy rain nearby |
23.2 ° C (73.7°F) |
32 ° C (89.6°F) |
26.9 ° C (80.4°F) |
% 76 | 77% | 7.8 | Sunrise:07:11 AM Sunset: 07:21 PM |
Moonrise:04:45 PM Moonset: 02:37 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday |  Sunny |
23.7 ° C (74.6°F) |
33.5 ° C (92.4°F) |
27.2 ° C (81°F) |
% 77 | 70% | 9.1 | Sunrise:07:11 AM Sunset: 07:20 PM |
Moonrise:05:17 PM Moonset: 03:33 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday | Overcast |
24.2 ° C (75.6°F) |
32 ° C (89.6°F) |
27.2 ° C (80.9°F) |
% 75 | 62% | 9.1 | Sunrise:07:12 AM Sunset: 07:18 PM |
Moonrise:05:47 PM Moonset: 04:28 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Patchy rain nearby |
23.7 ° C (74.6°F) |
31 ° C (87.7°F) |
26.5 ° C (79.8°F) |
% 80 | 74% | 8.4 | Sunrise:07:12 AM Sunset: 07:17 PM |
Moonrise:06:15 PM Moonset: 05:21 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday | Patchy rain nearby |
23.8 ° C (74.8°F) |
28.3 ° C (82.9°F) |
25.4 ° C (77.8°F) |
% 74 | 49% | 6 | Sunrise:07:13 AM Sunset: 07:16 PM |
Moonrise:06:42 PM Moonset: 06:15 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday | Patchy rain nearby |
20.6 ° C (69°F) |
27.4 ° C (81.4°F) |
24.1 ° C (75.5°F) |
% 66 | 44% | 7 | Sunrise:07:13 AM Sunset: 07:15 PM |
Moonrise:07:10 PM Moonset: 07:09 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Sunny |
20 ° C (68.1°F) |
29.3 ° C (84.7°F) |
23.8 ° C (74.9°F) |
% 52 | 4% | 7 | Sunrise:07:14 AM Sunset: 07:14 PM |
Moonrise:07:40 PM Moonset: 08:05 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Sunny |
20.6 ° C (69.1°F) |
29.3 ° C (84.7°F) |
24.4 ° C (75.9°F) |
% 55 | 6% | 7 | Sunrise:07:14 AM Sunset: 07:12 PM |
Moonrise:08:13 PM Moonset: 09:02 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
21.9 ° C (71.4°F) |
29.3 ° C (84.7°F) |
25.1 ° C (77.2°F) |
% 57 | 9% | 7 | Sunrise:07:15 AM Sunset: 07:11 PM |
Moonrise:08:50 PM Moonset: 10:03 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Sunny |
22.8 ° C (73°F) |
29.8 ° C (85.7°F) |
25.8 ° C (78.4°F) |
% 63 | 11% | 7 | Sunrise:07:15 AM Sunset: 07:10 PM |
Moonrise:09:34 PM Moonset: 11:06 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday |  Light rain shower |
23.7 ° C (74.7°F) |
28.6 ° C (83.4°F) |
25.5 ° C (78°F) |
% 75 | 85% | 6 | Sunrise:07:16 AM Sunset: 07:09 PM |
Moonrise:10:26 PM Moonset: 12:10 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday | Light rain shower |
23.2 ° C (73.8°F) |
24.6 ° C (76.3°F) |
23.8 ° C (74.8°F) |
% 91 | 92% | 5 | Sunrise:07:16 AM Sunset: 07:08 PM |
Moonrise:11:25 PM Moonset: 01:12 PM Moon Phase ( Last Quarter ) |
|
| 03 October 2026 Saturday | Light rain shower |
24.2 ° C (75.6°F) |
29.3 ° C (84.8°F) |
26.6 ° C (79.9°F) |
% 81 | 87% | 6 | Sunrise:07:17 AM Sunset: 07:07 PM |
Moonrise:Does not rise today Moonset: 02:11 PM Moon Phase ( Last Quarter ) |
|
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