St. Petersburg climate

Name: St. Petersburg
Address: US

St. Petersburg is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 13 °C. August is the wettest month (155 mm) and November the driest (41 mm). Figures are 1991–2020 climate normals.

Across a full year St. Petersburg averages 1,016 mm of rain, 215 days above 25 °C and 0 days below freezing.

United States · 13 m elevation · population 257,083 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 30 °C
Coldest month January 13 °C
Driest month November 41 mm
Wettest month August 155 mm
Least cloud May 40 % cloud
Hottest on record August 37 °C
Coldest on record January -0.7 °C
Warmest sea August 30 °C

What to expectSt. Petersburg through the year

St. Petersburg has a clear annual cycle: average daily highs run from 20 °C in January to 30 °C in August, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 215 days a year reach 25 °C, 58 of them reach 30 °C, 0 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in August.

Rain is strongly seasonal. August averages 155 mm against 41 mm in November — 3.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off St. Petersburg is warmest in August at 30 °C and coldest in January at 18 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	19.5 °C	61 mm	51 %
February	20.4 °C	45 mm	47 %
March	22.3 °C	57 mm	44 %
April	25.2 °C	50 mm	42 %
May	28.2 °C	63 mm	40 %
June	29.5 °C	149 mm	58 %
July	29.9 °C	149 mm	64 %
August	30.0 °C	155 mm	63 %
September	29.4 °C	131 mm	60 %
October	27.2 °C	61 mm	47 %
November	23.7 °C	41 mm	43 %
December	21.1 °C	53 mm	48 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	19.5 °C	13.5 °C	16.2 °C	27.0 °C	-0.7 °C	0	0
February	20.4 °C	14.4 °C	17.0 °C	29.8 °C	-0.1 °C	2	0
March	22.3 °C	16.3 °C	19.0 °C	30.4 °C	3.7 °C	5	0
April	25.2 °C	19.2 °C	22.0 °C	32.3 °C	10.8 °C	17	0
May	28.2 °C	22.1 °C	25.0 °C	36.2 °C	14.7 °C	29	4
June	29.5 °C	24.7 °C	26.9 °C	35.8 °C	20.6 °C	30	11
July	29.9 °C	25.5 °C	27.6 °C	34.3 °C	22.8 °C	31	14
August	30.0 °C	25.6 °C	27.6 °C	36.5 °C	23.1 °C	31	16
September	29.4 °C	24.6 °C	26.7 °C	34.0 °C	18.1 °C	30	10
October	27.2 °C	21.8 °C	24.3 °C	34.3 °C	10.2 °C	27	2
November	23.7 °C	17.8 °C	20.5 °C	30.0 °C	6.8 °C	10	0
December	21.1 °C	15.2 °C	17.8 °C	26.8 °C	3.2 °C	3	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	61 mm	6	11 h/day	51 %	76 %	19 km/h	18.2 °C
February	45 mm	6	11 h/day	47 %	77 %	19 km/h	18.2 °C
March	57 mm	6	12 h/day	44 %	74 %	20 km/h	20.1 °C
April	50 mm	6	13 h/day	42 %	72 %	20 km/h	23.0 °C
May	63 mm	8	14 h/day	40 %	72 %	18 km/h	25.9 °C
June	149 mm	18	14 h/day	58 %	78 %	15 km/h	28.4 °C
July	149 mm	22	14 h/day	64 %	79 %	14 km/h	29.8 °C
August	155 mm	23	13 h/day	63 %	79 %	14 km/h	30.1 °C
September	131 mm	17	12 h/day	60 %	78 %	16 km/h	29.2 °C
October	61 mm	8	12 h/day	47 %	74 %	18 km/h	26.8 °C
November	41 mm	4	11 h/day	43 %	74 %	18 km/h	23.0 °C
December	53 mm	5	10 h/day	48 %	76 %	18 km/h	20.3 °C

Where St. Petersburg ranks

Ranking	Position	Value
Places with the best weather in North America in March	19th of 50	91/100
Warmest sea temperatures in the world in August	28th of 50	30 °C
Places with the best weather in North America in December	29th of 50	94/100
Places with the best weather in North America in February	44th of 50	91/100
Best beach destinations in the world in May	48th of 50	89/100

Planning a trip? See the best time to visit St. Petersburg.

QuestionsCommon questions about St. Petersburg’s climate

When is the best time to visit St. Petersburg?

That depends on what you want, so the honest answer is a comparison rather than a single month. March, April, November sit closest to 20 °C on average, August is the warmest month and November the driest. The month-by-month table above has the full picture.

How hot does St. Petersburg get?

In August, the warmest month, daily highs average 30 °C. About 58 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 13 °C in January, the coldest month. A normal year has 0 nights below freezing.

Which month is wettest in St. Petersburg?

August, averaging 155 mm over 23 days with rain. The driest month is November with 41 mm. The year as a whole averages 1,016 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in St. Petersburg rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 27.771°, -82.679° , 13 m above sea level (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.