Weather in Prague in September

Daylight on the 15th: 12 h 38 min
Average high: 21 °C (70 °F)
Average low: 10 °C (49 °F)
Precipitation: 50 mm

In September, the area around Prague averages daytime highs of 21 °C (70 °F) and night-time lows of 10 °C (49 °F). Days are mild; a light jacket covers most of it.

Temperature

Compared with August, September is cooler by 5 °C in daytime highs, and October is cooler by 6 °C than September. The daily average is 15 °C (59 °F).

Precipitation, humidity and wind

Precipitation averages about 50 mm over the month, with 9 days of at least 1 mm. Expect some wet days, but not every day.

Relative humidity averages 71 % and wind at 2 m about 2.3 m/s.

Daylight

On 15 September the sun rises at 06:38 and sets at 19:17 local time, for 12 h 38 min of daylight, 111 minutes less than a month earlier.

About these numbers

The figures are 2011-2020 averages for the grid cell around Prague from the NASA POWER project, a model based data set. They describe the area rather than one weather station, and a single year can differ.

Month by month

Month	High	Low	Precipitation
January	2 °C	-4 °C	43 mm
February	4 °C	-4 °C	30 mm
March	9 °C	-1 °C	36 mm
April	15 °C	4 °C	36 mm
May	19 °C	8 °C	70 mm
June	24 °C	12 °C	84 mm
July	26 °C	14 °C	75 mm
August	26 °C	14 °C	74 mm
September	21 °C	10 °C	50 mm
October	15 °C	5 °C	55 mm
November	8 °C	1 °C	37 mm
December	4 °C	-2 °C	39 mm

Questions

How warm is Prague in September?

Average highs of 21 °C (70 °F) and lows of 10 °C (49 °F) (2011-2020 averages).

Does it rain a lot in Prague in September?

About 50 mm over the month, on 9 days with at least 1 mm.

Sources

NASA Langley Research Center POWER Project, funded through the NASA Earth Science Directorate Applied Science Program (2026-09-22)
Computed from the city coordinates with the NOAA solar position equations
IANA tz database
Wikidata, CC0 (2026-09-22)