Click on a day for an hourly weather forecast
The temperatures in Olsztyn in May are quite cold with temperatures between 7°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Olsztyn. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Olsztyn in May 2026.
If you’re planning to visit Olsztyn in the near future, we highly recommend that you review the 14 day weather forecast for Olsztyn before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -5° | 7 | 7 | 18 | 63 mm | Awful | Olsztyn in January |
| February | 1° / -4° | 5 | 7 | 16 | 51 mm | Awful | Olsztyn in February |
| March | 6° / -1° | 6 | 15 | 10 | 47 mm | Awful | Olsztyn in March |
| April | 13° / 3° | 5 | 22 | 3 | 52 mm | Bad | Olsztyn in April |
| May | 18° / 7° | 8 | 23 | 0 | 105 mm | Ok | Olsztyn in May |
| June | 22° / 11° | 8 | 22 | 0 | 114 mm | Ok | Olsztyn in June |
| July | 24° / 13° | 7 | 24 | 0 | 126 mm | Good | Olsztyn in July |
| August | 24° / 13° | 5 | 26 | 0 | 86 mm | Perfect | Olsztyn in August |
| September | 19° / 10° | 4 | 26 | 0 | 64 mm | Good | Olsztyn in September |
| October | 12° / 5° | 6 | 25 | 1 | 64 mm | Ok | Olsztyn in October |
| November | 6° / 2° | 7 | 19 | 4 | 63 mm | Awful | Olsztyn in November |
| December | 1° / -2° | 7 | 12 | 12 | 60 mm | Awful | Olsztyn in December |