Best Time to Visit Thornton
Best time: Jun, Jul, Aug, Sep.
Jul is warmest (31.8°C high); May is rainiest (65 mm).
Thornton weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 7.1 | -8 | 14 | 3.9 |
| Feb | 9.3 | -5.9 | 14 | 5.4 |
| Mar | 12.5 | -2.8 | 38 | 7.3 |
| Apr | 16.7 | 1.1 | 53 | 8.8 |
| May | 22.1 | 6.4 | 65 | 10.3 |
| Jun | 28.3 | 11.6 | 46 | 11.4 |
| Jul | 31.8 | 14.6 | 50 | 11.2 |
| Aug | 30.5 | 13.8 | 41 | 9.7 |
| Sep | 25.8 | 8.7 | 36 | 8.3 |
| Oct | 19.6 | 2.3 | 28 | 6 |
| Nov | 11.2 | -3.8 | 28 | 4.2 |
| Dec | 7.6 | -7.5 | 16 | 3.6 |
Average high temperature
Best months by activity
Overall: JunJulAugSep
Beaches: AugJulJunSep
Hiking: JunSepOctAug
Sightseeing: JunJulAugSep
Thornton quick facts
What to pack
Cold months (Jan, Feb, Mar, Nov, Dec): warm layers and a coat.
Frequently asked questions
When is the best time to visit Thornton?
Jun, Jul, Aug, Sep.
What is the rainiest month?
May, about 65 mm.
What is the warmest month?
Jul, with average highs of 31.8°C.
Where to stay
See Thornton hotels · Book Thornton tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.