Best year time to visit Sienna

General weather information about Sienna

Average annual temperature is 9.9 °C

Absolute maximum temperature: 29.8 °C

Absolute minimum temperature: -13.8 °C

Number of sunny days: 104 days

Number of rainy days: 224 days

Number of snow days: 37 days

Look at detailed online map of Sienna

* Weather data for Sienna Poland is based on climate observations for 2026 year

Sienna air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	13.3	9.5	18.8	19.9	22.7	27.1	29.7	29.8	27.8	22.8	14.9	9.1
Average daytime temperature (°C)	4.2	2.8	9.3	11.0	16.9	21.1	24.2	24.3	22.7	16.3	7.1	3.6
Average temperature (°C)	2.2	-0.1	4.8	6.8	12.4	17.0	19.6	19.8	17.4	12.5	4.6	1.4
Average night temperature (°C)	-0.2	-3.4	0.3	2.3	7.1	12.0	14.3	15.3	12.5	8.4	1.9	-0.9
Absolute minimum temperature (°C)	-6.9	-13.8	-8.8	-5.9	1.7	6.3	9.0	9.5	8.9	-0.3	-8.2	-9.5

Sienna monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	10.0	12.0	14.0	15.0	16.0	16.0	15.0	13.0	11.0	9.0	8.0
Daylight mean duration (h)	8.7	10.1	11.9	13.8	15.4	16.2	15.8	14.4	12.6	10.8	9.1	8.2
Daylight minimum duration (h)	8.0	9.0	10.0	12.0	14.0	16.0	15.0	13.0	11.0	9.0	8.0	8.0
Sunshine mean duration (h)	2.8	3.5	6.9	6.5	9.4	11.6	11.8	9.3	9.2	6.3	3.6	2.7
Precipitation (mm)	113	127	65	71	121	82	107	128	60	96	135	113
Sunny days	6	7	10	5	12	9	9	8	18	10	2	8
Rainy days	15	15	15	22	19	21	22	23	12	21	24	15
Snow days	10	6	6	3	0	0	0	0	0	0	4	8

Sienna - weather forecast by months

Sienna weather in january Sienna weather in february Sienna weather in march Sienna weather in april Sienna weather in may Sienna weather in june Sienna weather in july Sienna weather in august Sienna weather in september Sienna weather in october Sienna weather in november Sienna weather in december

Best time to visit Sienna:

The best time to visit Sienna during the most sunny months:

May — 9.4(h)
June — 11.6(h)
July — 11.8(h)
August — 9.3(h)
September — 9.2(h)

Months with the longest average daylight duration in Sienna:

May — 15.4(h)
June — 16.2(h)
July — 15.8(h)

The largest precipitation sum in Sienna is at

August — 128(mm)

November — 135(mm)

Weather forecast in the closest to Sienna admin centers