Trysil records about 549mm of rain across roughly 99 wet days a year, which is a 27% chance on an average day. September is the wettest month at 90mm (16% of the annual total) and March the driest at 9mm. Local rain type: brief showers.
Chance of rain on an average day: 27%
Rainfall climatology for Trysil. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone. Showing .
| Annual rainfall | 549mm |
| Rain days per year | 99 |
| Odds on an average day | 27% |
| Wettest month | September — 90mm over 15 days |
| Driest month | March — 9mm over 2 days |
| Rain type | brief showers |
| Best dry window | March is the most reliable dry stretch of the year. |
| Worst rain window | September carries the highest chance of a washed-out day. |
September delivers 900% more rain than March (90mm vs 9mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 16% of the annual total, so rain in Trysil is spread through the year — there is no season you can rely on being dry.
Trysil rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 15 days in September against 2 in March — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 27mm | 6 | 20% | -6°C |
| February | 18mm | 4 | 13% | -4°C |
| March | 9mm | 2 | 7% | 1°C |
| April | 18mm | 3 | 10% | 8°C |
| May | 42mm | 7 | 23% | 15°C |
| June | 42mm | 7 | 23% | 20°C |
| July | 66mm | 11 | 37% | 22°C |
| August | 78mm | 13 | 43% | 20°C |
| September | 90mm | 15 | 50% | 15°C |
| October | 78mm | 13 | 43% | 8°C |
| November | 45mm | 10 | 33% | 1°C |
| December | 36mm | 8 | 27% | -4°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Trysil we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Trysil records rain on roughly 99 days a year — about a 27% chance on any given day — totalling around 549mm.
September, with about 90mm over 15 rain days. That is 16% of the entire year's rainfall in a single month.
March is the driest month at 9mm across roughly 2 days.
With rain on about 27% of days and brief showers as the dominant type, a compact umbrella or waterproof shell is worth packing for Trysil outside March.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.