Annual mean 9°C · wettest around October · prevailing wind SW
Warmest
23.6 °C
Coldest
-2.1 °C
Wettest
22%
Windiest
4.5 m/s
Prevailing
SW
3.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Olsztyn over the whole year is 9°C. August is the hottest month, with highs of about 23°C; January is the coldest, with lows of about -2°C. Olsztyn has no sharply defined rainy season: the chance of rain on a given day runs from 11% in April, the driest month, to 18% in October, the wettest. Winds in Olsztyn are highest in December, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Olsztyn come in August, when the sky is typically 57% covered; December is the cloudiest month, at 88%.
Month by month Olsztyn climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-0°C
-2°C
-5°C
18%
85%
3.6 m/s
0
0
1
February
2°C
-0°C
-3°C
18%
77%
3.5 m/s
0
0
3
March
6°C
1°C
1°C
13%
70%
3.1 m/s
1
0
16
April
12°C
5°C
8°C
11%
60%
3.3 m/s
18
2
52
May
17°C
10°C
13°C
13%
61%
2.9 m/s
43
3
76
June
22°C
14°C
20°C
13%
57%
2.8 m/s
76
19
67
July
22°C
16°C
20°C
17%
62%
2.7 m/s
75
21
63
August
23°C
16°C
22°C
14%
57%
2.4 m/s
75
29
57
September
19°C
11°C
17°C
11%
61%
2.6 m/s
60
9
76
October
12°C
8°C
8°C
18%
70%
3.2 m/s
13
0
61
November
5°C
3°C
1°C
14%
84%
3.2 m/s
0
0
18
December
1°C
0°C
-3°C
18%
88%
3.7 m/s
0
0
2
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Olsztyn weather by season
Year round, Olsztyn has days of about -0°C at their warmest in January, its coolest month, and 23°C in August, its warmest; the coolest hours of the day run from -2°C to 16°C through the year, and the average temperature over the year is 9°C around the clock. Rain is most likely around October and least likely around April. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Olsztyn weather in winterDecember to February
High 1°CLow -0°CRain 18%
Winter in Olsztyn has typical daily highs of about 1°C and lows of about -0°C, with a 18% chance of rain on a given day.
Olsztyn weather in springMarch to May
High 12°CLow 5°CRain 12%
Spring in Olsztyn has typical daily highs of about 12°C and lows of about 5°C, with a 12% chance of rain on a given day.
Olsztyn weather in summerJune to August
High 22°CLow 15°CRain 14%
Summer in Olsztyn has typical daily highs of about 22°C and lows of about 15°C, with a 14% chance of rain on a given day.
Olsztyn weather in autumnSeptember to November
High 12°CLow 7°CRain 14%
Autumn in Olsztyn has typical daily highs of about 12°C and lows of about 7°C, with a 14% chance of rain on a given day.
When is the rainy season in Olsztyn?
Olsztyn has no sharply defined rainy season: the chance of rain on a given day runs from 11% in April, the driest month, to 18% in October, the wettest.
What time of year is Olsztyn windiest?
Winds in Olsztyn are highest in December, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Olsztyn year round?
The average temperature in Olsztyn over the whole year is 9°C. August is the hottest month, with highs of about 23°C; January is the coldest, with lows of about -2°C.