Upper Main Arm Weather Forecast

Today 18 Dec
- 18
- 27
Clear
Fri 19 Dec
- 17
- 31
Sunny
Sat 20 Dec
- 19
- 33
Sunny
Sun 21 Dec
- 21
- 35
Sunny
Mon 22 Dec
- 22
- 35
Mostly sunny
Tue 23 Dec
- 23
- 34
Showers increasing
Wed 24 Dec
- 23
- 29
Shower or two

Today 18 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Fri 19 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Sat 20 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Sun 21 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Mon 22 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Tue 23 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Wed 24 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm

Today 18 Dec Northern Rivers

Clear. Winds east to northeasterly 15 to 20 km/h becoming light in the late evening.

Upper Main Arm Temperature Statistics View More

December Temperature

Cape Byron (28km)

Lowest 3 August, 2025
7.3 °C
Average 2025
20.3 °C
Highest 27 October, 2025
35.9 °C
Lowest 11 November, 2025
15.4 °C
Average November
22.1 °C
Highest 17 November, 2025
32.4 °C
Lowest 3 December, 2025
16.6 °C
Average December
23 °C
Highest 10 December, 2025
31 °C

Climate (2020–Present)

Cape Byron (28km)

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Average Low 2020–2025
17.3 °C
Average 2020–2025
20.2 °C
Average High 2020–2025
23.7 °C

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