Overall on the next 14 days there will be 2 days with snow in Rio Negro and a total of 0.4 cm of snow.
It will be snowy on the following days:
Rio Negro weather in September 2026
Click on a day for an hourly weather forecast
Friday
Sep 18
0 mm
12° / 1°
Saturday
Sep 19
0.3 mm
12° / 1°
Sunday
Sep 20
0.2 cm
4° / -2°
Monday
Sep 21
0 mm
4° / -4°
Tuesday
Sep 22
0.2 cm
4° / -2°
Wednesday
Sep 23
2.8 mm
6° / 2°
Thursday
Sep 24
40.8 mm
7° / 2°
Friday
Sep 25
1.5 mm
3° / -4°
Saturday
Sep 26
0 mm
6° / -5°
Sunday
Sep 27
0 mm
8° / -1°
Monday
Sep 28
0 mm
10° / 1°
Tuesday
Sep 29
0 mm
13° / 3°
Wednesday
Sep 30
0 mm
15° / 5°
Thursday
Oct 1
0 mm
14° / 3°
🌨️ Snowy days in Rio Negro 2026 (September)
The average weather in Rio Negro in September
The temperatures in Rio Negro in September are quite cold with temperatures between 8°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Rio Negro during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Rio Negro in September 2026.
If you’re planning to visit Rio Negro in the near future, we highly recommend that you review the 14 day weather forecast for Rio Negro before you arrive.
Temperatures
19° / 8°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
81
mm
Sun Hours
10.2
Hrs
Historic average weather for September
Click on a day for an hourly weather forecast
Explore the weather in Rio Negro in other months
Rio Negro annual weather
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 33° / 17° | 3 | 28 | 0 | 93 mm | Good | Rio Negro in January |
| February | 31° / 16° | 3 | 25 | 0 | 69 mm | Good | Rio Negro in February |
| March | 28° / 14° | 4 | 28 | 0 | 82 mm | Perfect | Rio Negro in March |
| April | 23° / 12° | 3 | 27 | 0 | 83 mm | Perfect | Rio Negro in April |
| May | 18° / 9° | 3 | 28 | 0 | 62 mm | Good | Rio Negro in May |
| June | 14° / 7° | 2 | 28 | 0 | 27 mm | Good | Rio Negro in June |
| July | 14° / 5° | 2 | 29 | 0 | 34 mm | Good | Rio Negro in July |
| August | 17° / 7° | 2 | 29 | 0 | 44 mm | Good | Rio Negro in August |
| September | 19° / 8° | 4 | 26 | 0 | 81 mm | Good | Rio Negro in September |
| October | 22° / 10° | 5 | 26 | 0 | 120 mm | Good | Rio Negro in October |
| November | 27° / 13° | 5 | 25 | 0 | 113 mm | Perfect | Rio Negro in November |
| December | 31° / 16° | 4 | 27 | 0 | 95 mm | Good | Rio Negro in December |
Temperatures in Rio Negro in September
Rain in Rio Negro in September
Weather in Rio Negro in September - FAQ
What is the average temperature in Rio Negro in September?
The average temperature in Rio Negro in September is 8/19° C.
What is the chance of rain in Rio Negro in September?
On average, there are 4 rainy days in Rio Negro during September.
Weather wise, is September a good time to visit Rio Negro?
The weather in Rio Negro in September is good.
Can it snow in Rio Negro in September?
On average, there are 0 snowy days in Rio Negro in September.
More about the weather in Rio Negro