5-day weather forecast Petersburg 18-05-2026

Weather forecast Petersburg tomorrow 18.05.2026: sunny, temperature from 20 °C to 34 °C.

Precipitation probability 60%. Wind up to 4.61 m/s (gusts 8.03 m/s). Air humidity 32–97%, atmospheric pressure 766–768 mm Hg, UV index up to 9.2.

Sunrise 05:59
Sunset 20:14

Waxing Crescent2% illuminated
Moonrise 07:09 · Moonset 23:00

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Table

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

Forecast from 20 °C to 34 °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)	22	22	22	21	21	20	20	22	24	26	28	30	32	33	34	34	34	34	32	30	28	26	25	24
Precipitation (mm/hr)	0	0	0	0	0.03	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	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 (%)	19	21	21	19	76	12	100	15	12	6	6	7	7	29	32	21	16	17	17	13	6	4	2	2
Rain chance (%)	0	0	0	0	60	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

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)	2.11	3	3.39	3.11	2.89	2.31	2.31	2.69	3.39	3.39	3.31	3.39	3.61	3.69	3.61	3.89	4.19	4.61	4.5	4.61	4	3.5	3.5	3.61
Wind gust (m/s)	4.42	6.17	6.28	5.67	5.42	4.67	4.83	4.89	4.47	3.92	3.81	3.92	4.14	4.25	4.14	4.5	4.83	5.47	6.14	7.75	8.03	7.36	7.36	7.56
Wind direction (°)	S 184°	SSW 196°	SSW 210°	SW 217°	SSW 210°	SSW 194°	S 188°	SSW 201°	SW 229°	WSW 237°	SW 229°	SW 228°	SW 221°	SW 214°	SSW 209°	SSW 204°	SSW 201°	SSW 196°	S 187°	S 181°	S 180°	S 185°	S 190°	S 187°

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 (%)	81	81	82	85	88	94	97	92	80	67	58	50	44	40	36	33	32	32	38	46	52	54	56	58

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)	766	766	767	767	767	767	767	767	768	768	768	767	767	767	767	767	766	766	766	766	767	767	767	767

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	0.2	0.9	2.3	4.4	6.6	8.4	9.2	8.8	7.3	5.1	3	1.3	0.4	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)	8.2	7.4	7.2	7.3	8	9.8	11.3	12.5	12.9	12.8	12.7	12.6	11.7	11.2	10.8	11.1	11.2	10.5	9.6	8.8	8.2	8	7	6.1
PM10 (µg/m³)	9.5	8.6	8.4	8.4	9.2	11.7	13.7	15.2	15.9	15.9	15.9	16.2	15.1	14.5	13.8	13.8	13.6	12.8	11.6	10.7	10.1	10	8.6	7.2
Ozone (O₃) (µg/m³)	69	65	62	60	63	76	94	108	116	120	122	123	122	119	111	100	91	88	87	86	82	77	72	68
NO₂ (µg/m³)	4.3	4.4	4.4	4.4	4.2	3.7	3	2.4	2.1	1.9	1.8	1.6	1.5	1.8	2.9	4.3	5.3	5.4	5.1	4.8	4.5	4.1	3.9	3.9
SO₂ (µg/m³)	1.6	1.6	1.6	1.7	1.7	1.8	1.9	1.9	1.9	1.8	1.7	1.7	1.6	1.6	1.6	1.7	1.7	1.7	1.6	1.6	1.6	1.6	1.6	1.6
CO (µg/m³)	161.9	161.9	162.9	163.9	164.9	165.9	165.9	164.9	162.9	159.9	156.9	153.9	150.9	150.9	155.9	162.9	167.9	169.9	169.9	167.9	163.9	158.9	153.9	150.9

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

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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.

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