Climate Insights for Flagstaff

The climate in Flagstaff is temperate. The average annual temperature is 18°C and approximately 785mm of precipitation falls per year. November is the wettest month, receiving around 109mm of rainfall. Flagstaff is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, December, January. The coldest months are July, June, August, when temperatures can drop to 6°C.

Temperatures in Flagstaff vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is February, when average highs reach 28°C and the mean temperature sits around 22°C. July is the coolest month, with minimum temperatures around 6°C and an average of 12°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 3°C shift in average temperatures.

Flagstaff is a relatively dry area, receiving approximately 785mm of precipitation annually, which averages out to around 65mm per month. The wettest month is November, averaging 109mm of rainfall. January and February also tend to see above-average precipitation. The driest month is August, with just 20mm. That's 89mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Flagstaff is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently winter in Flagstaff, which began on June 21, 2026. Flagstaff is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 28°C, while the coldest stretch bottoms out in July near 6°C. Spring is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Flagstaff is during February, March, April, May, August, September, October and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 61mm per month. By contrast, July can be quite cold with temperatures dropping to 6°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Flagstaff based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.