5-day weather forecast St. Petersburg 20-07-2026

Weather forecast St. Petersburg today 20.07.2026: sunny, temperature from 26 °C to 32 °C.

Precipitation probability 82%. Wind up to 11 m/s (gusts 19.28 m/s). Air humidity 75–90%, atmospheric pressure 759–761 mm Hg, UV index up to 9.8.

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MinorJul 19, 08:02 AM — Jul 21, 08:00 PMTranslate with Google

Small Craft Advisory issued July 19 at 8:02AM EDT until July 21 at 8:00PM EDT by NWS Tampa Bay Ruskin FL

Small Craft Advisory

* WHAT...South winds 15 to 25 knots and rough waters. * WHERE...Tampa Bay waters. * WHEN...Until 8 PM EDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

Sunrise 06:47
Sunset 20:26

First Quarter43% illuminated
Moonrise 13:09 · Moonset 00:01

Chart

Table

Mon, Jul 20, 2026

Tue, Jul 21 →

Forecast from 26 °C to 32 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	26	26	26	26	26	26	26	26	26	28	29	30	29	32	29	32	30	31	28	28	26	26	26	26
Precipitation (mm/hr)	0	0	0	0	0.01	0	0	0.01	0	0	0.01	0	4.81	4.43	0.08	0.11	0.06	0	0	0	0.04	0	0.02	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	23	10	29	51	77	0	0	80	15	41	77	100	90	72	62	73	70	1	0	0	80	0	83	0
Rain chance (%)	14	13	15	19	24	13	13	24	13	15	20	23	82	76	19	26	21	9	9	9	25	11	27	10

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	7.19	7.39	7.61	8.11	8.31	8.69	8.61	8.61	8.61	9	9.5	10.19	10.31	10.5	10.61	10.69	10.89	11	10.5	10.19	9.89	9.69	9.61	9.31
Wind gust (m/s)	9.94	10.14	10.61	11.42	11.72	13.58	14.36	14.78	15.44	11.72	13.17	16.08	16.81	18.97	19.06	14.47	16.36	19.28	17.14	19.03	15.89	13.33	13.28	12.97
Wind direction (°)	S 170°	S 170°	S 169°	S 170°	S 175°	S 177°	S 174°	S 173°	S 174°	S 180°	S 187°	S 186°	S 187°	S 184°	S 180°	S 177°	S 181°	S 186°	S 184°	S 180°	S 181°	S 180°	S 183°	S 182°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	87	88	89	89	90	89	90	87	86	84	83	80	84	81	75	80	79	81	85	81	84	85	87	83

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	761	760	760	759	759	759	759	760	760	761	761	761	761	761	761	760	760	760	759	760	760	760	760	760

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.5	1.6	3.3	5.1	6.8	9.3	9.8	8.8	6.6	3.7	1.6	0.5	0	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	5.8	6.1	6	5.9	6.2	6.4	6.5	6.4	6.5	6.5	6.5	6.4	6.7	6.7	6.4	6.5	6.4	5.8	6.3	5.7	5.9	5.9	5.8	5.7
PM10 (µg/m³)	8.8	9.5	9.2	9.1	9.7	9.8	10.1	9.8	10.1	10.1	10	10	10.4	10.4	10.1	10.2	10	9	10	9.2	9.5	9.5	9.5	9.5
Ozone (O₃) (µg/m³)	97	96	95	94	93	92	90	88	87	87	89	90	91	92	92	92	92	92	92	92	91	90	89	88
NO₂ (µg/m³)	1.2	1.1	1.1	1	0.9	0.9	1	1.2	1.3	1.2	0.9	0.7	0.6	0.6	0.6	0.6	0.6	0.6	0.7	0.9	1	1.1	1.1	1.1
SO₂ (µg/m³)	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.1	0.1	0.1	0.2	0.2
CO (µg/m³)	110	112	112	108	103	99	100	103	105	106	107	107	105	103	102	104	107	109	110	110	110	109	107	105

Mon, Jul 20, 2026

Tue, Jul 21 →

Frequently asked questions about the weather in St. Petersburg

Today in St. Petersburg the temperature ranges from 26 °C to 32 °C, wind up to 11 m/s. Check the detailed hourly forecast above for more information.

The precipitation probability in St. Petersburg today is 82%. View the full multi-day forecast above to see the rain chances for each upcoming day.

The wind speed in St. Petersburg today reaches up to 11 m/s with gusts up to 19.28 m/s. Check the detailed wind chart above for hourly wind data.

The air humidity in St. Petersburg today ranges from 75% to 90%. View the humidity chart above for hourly details.

The UV index in St. Petersburg today reaches up to 9.8. Check the UV index chart above for hourly values throughout the day.

The atmospheric pressure in St. Petersburg today ranges from 759 to 761 mm Hg. View the pressure chart above for hourly readings.

Cloud cover in St. Petersburg today reaches up to 100%. Check the cloud cover chart above for hourly details throughout the day.

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Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.

Learn more about our methodology →