St Clair Weather, NSW
St Clair is a suburb of Singleton in the Hawkesbury local government area, with a population of about 19,942 (NSW ABS Census 2021). The local climate is temperate with cool nights, typical of the Singleton region.
Annual averages from the nearest weather station: maximum daily temperature of 24.9°C, minimum of 13.7°C, and around 731 mm of rainfall spread across the year.
Monthly averages
| Month | Max °C | Min °C | Rain mm | Rain days | Comfort |
|---|---|---|---|---|---|
| January | 31.6 | 20.3 | 42 | 8 | 5.5 Variable |
| February | 30.7 | 20.1 | 78 | 14 | 5.2 Variable |
| March | 28.6 | 17.4 | 28 | 5 | 7.3 Good |
| April | 24.1 | 13.1 | 124 | 10 | 9.2 Excellent |
| May | 20.1 | 10.0 | 94 | 11 | 6.1 Good |
| June | 16.9 | 6.9 | 100 | 9 | 3.9 Challenging |
| July | 16.7 | 7.4 | 31 | 5 | 4.7 Variable |
| August | 20.6 | 9.6 | 51 | 10 | 7.3 Good |
| September | 23.2 | 10.3 | 48 | 7 | 9.8 Excellent |
| October | 24.5 | 12.5 | 60 | 9 | 10.0 Excellent |
| November | 29.1 | 17.3 | 65 | 12 | 6.8 Good |
| December | 32.5 | 19.1 | 11 | 4 | 5.3 Variable |
What locals should know
With the coast over 80 km away, St Clair runs a touch hotter in summer and colder in winter than Singleton's coastal averages suggest. At around 339 m elevation, expect noticeably cooler nights than Singleton year-round, especially in June. The hottest month is typically December (32°C average max) and the wettest is April (124 mm). All averages quoted come from the nearest long-term weather station, 24 km away in Singleton.