Olsztyn climate
Olsztyn is warmest in July, with average highs of 22 °C, and coldest in January, when nights average -4.6 °C. July is the wettest month (86 mm) and February the driest (38 mm). Figures are 1991–2020 climate normals.
Across a full year Olsztyn averages 655 mm of rain, 21 days above 25 °C and 104 days below freezing.
Poland · population 169,793 · 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 July 22 °C
- Coldest month January -4.6 °C
- Driest month February 38 mm
- Wettest month July 86 mm
- Least cloud August 59 % cloud
- Hottest on record July 34 °C
- Coldest on record February -31 °C
What to expectOlsztyn through the year
Olsztyn has a clear annual cycle: average daily highs run from -0.3 °C in January to 22 °C in July, a swing of 21 °C in mean temperature across the year.
Counted across a normal year, 21 days a year reach 25 °C, 2 of them reach 30 °C, 104 nights drop below freezing. The warmest reading in the 1991–2020 record is 34 °C, in July.
Rain is strongly seasonal. July averages 86 mm against 38 mm in February — 2.3 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | -0.3 °C | 44 mm | 80 % |
| February | 1.1 °C | 38 mm | 78 % |
| March | 5.5 °C | 44 mm | 70 % |
| April | 12.2 °C | 42 mm | 60 % |
| May | 17.3 °C | 64 mm | 59 % |
| June | 20.4 °C | 72 mm | 61 % |
| July | 22.5 °C | 86 mm | 59 % |
| August | 22.2 °C | 66 mm | 59 % |
| September | 17.2 °C | 59 mm | 65 % |
| October | 11.2 °C | 51 mm | 71 % |
| November | 5.4 °C | 42 mm | 82 % |
| December | 1.4 °C | 46 mm | 83 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | -0.3 °C | -4.6 °C | -2.3 °C | 11.3 °C | -28.1 °C | 0 | 0 | 23 |
| February | 1.1 °C | -4.3 °C | -1.5 °C | 12.2 °C | -30.9 °C | 0 | 0 | 22 |
| March | 5.5 °C | -1.8 °C | 1.8 °C | 17.6 °C | -16.7 °C | 0 | 0 | 19 |
| April | 12.2 °C | 2.7 °C | 7.7 °C | 26.2 °C | -13.7 °C | 0 | 0 | 7 |
| May | 17.3 °C | 7.8 °C | 12.9 °C | 28.9 °C | -2.7 °C | 2 | 0 | 0 |
| June | 20.4 °C | 11.5 °C | 16.3 °C | 32.2 °C | 3.1 °C | 4 | 0 | 0 |
| July | 22.5 °C | 14.0 °C | 18.5 °C | 34.0 °C | 7.9 °C | 7 | 1 | 0 |
| August | 22.2 °C | 13.8 °C | 18.1 °C | 33.8 °C | 7.2 °C | 7 | 1 | 0 |
| September | 17.2 °C | 10.0 °C | 13.6 °C | 32.8 °C | 1.2 °C | 1 | 0 | 0 |
| October | 11.2 °C | 5.5 °C | 8.3 °C | 22.3 °C | -8.1 °C | 0 | 0 | 3 |
| November | 5.4 °C | 1.4 °C | 3.4 °C | 15.9 °C | -19.7 °C | 0 | 0 | 10 |
| December | 1.4 °C | -2.5 °C | -0.5 °C | 11.1 °C | -26.9 °C | 0 | 0 | 20 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 44 mm | 10 | 8.0 h/day | 80 % | 87 % | 21 km/h |
| February | 38 mm | 9 | 9.8 h/day | 78 % | 85 % | 21 km/h |
| March | 44 mm | 10 | 12 h/day | 70 % | 79 % | 20 km/h |
| April | 42 mm | 9 | 14 h/day | 60 % | 73 % | 19 km/h |
| May | 64 mm | 12 | 16 h/day | 59 % | 71 % | 18 km/h |
| June | 72 mm | 12 | 17 h/day | 61 % | 72 % | 18 km/h |
| July | 86 mm | 13 | 17 h/day | 59 % | 74 % | 17 km/h |
| August | 66 mm | 11 | 15 h/day | 59 % | 74 % | 17 km/h |
| September | 59 mm | 10 | 13 h/day | 65 % | 78 % | 18 km/h |
| October | 51 mm | 10 | 11 h/day | 71 % | 83 % | 20 km/h |
| November | 42 mm | 10 | 8.6 h/day | 82 % | 88 % | 20 km/h |
| December | 46 mm | 10 | 7.5 h/day | 83 % | 88 % | 21 km/h |
How Olsztyn compares
The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.
| Destination | Summer high | Winter low | Rain per year | Days above 25 °C |
|---|---|---|---|---|
| Olsztyn | 22 °C | -4.6 °C | 655 mm | 21 |
| Kaliningrad · Russia | 23 °C | -3.6 °C | 696 mm | 23 |
| Gdańsk · Poland | 22 °C | -2.3 °C | 600 mm | 18 |
| Gdynia · Poland | 21 °C | -1.8 °C | 705 mm | 10 |
Planning a trip? See the best time to visit Olsztyn.
QuestionsCommon questions about Olsztyn’s climate
When is the best time to visit Olsztyn?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and February the driest. The month-by-month table above has the full picture.
How hot does Olsztyn get?
In July, the warmest month, daily highs average 22 °C. About 2 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.
How cold does it get in winter?
Nights average -4.6 °C in January, the coldest month. A normal year has 104 nights below freezing.
Which month is wettest in Olsztyn?
July, averaging 86 mm over 13 days with rain. The driest month is February with 38 mm. The year as a whole averages 655 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 Olsztyn 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
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
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.