Our verdict
The best time to visit Flagstaff is March-May
In summer, the average maximum temperature is around 28℃ (83℉), but temperatures can sometimes reach as high as 31℃ (88℉) on the hottest days of the year. The average low temperatures in winter float around -4℃ (25℉), while the coldest it gets down to is about -7℃ (19℉).
If you’re a sun-chaser and want to visit Flagstaff when the days are longest, you should visit in August. To stay dry, avoid travelling to Flagstaff in July – It’s the wettest month of the year.
Continue reading to find out more about when to visit Flagstaff, including the climate, seasonal info, what to pack, FAQs, and the best tools to help you plan and book your next vacation.
Quick links: Fast facts / Seasons / Average temperatures / Monthly climate / FAQs / Map
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Flagstaff seasons
Before you continue, it’s important to know when the seasons are in Flagstaff as they might be different to yours depending on where in the world you’re travelling from. Flagstaff is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in Flagstaff
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Flagstaff for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
Flagstaff climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Flagstaff for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
Flagstaff in January
- Average temperature: 0℃ (32℉)
- Average high temperature: 6℃ (43℉)
- Average low temperature: -4℃ (25℉)
- Average humidity: 67%
- Average sunny days: 23 days
- Average rainfall: 20mm (1") over 3 days
- Average snow days: 6 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in January, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Flagstaff in February
- Average temperature: 2℃ (35℉)
- Average high temperature: 8℃ (46℉)
- Average low temperature: -3℃ (27℉)
- Average humidity: 60%
- Average sunny days: 21 days
- Average rainfall: 28mm (1") over 3 days
- Average snow days: 6 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in February, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Flagstaff in March
- Average temperature: 6℃ (43℉)
- Average high temperature: 12℃ (54℉)
- Average low temperature: 0℃ (33℉)
- Average humidity: 47%
- Average sunny days: 23 days
- Average rainfall: 23mm (1") over 5 days
- Average snow days: 4 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in March, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Flagstaff in April
- Average temperature: 10℃ (49℉)
- Average high temperature: 16℃ (61℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 36%
- Average sunny days: 23 days
- Average rainfall: 14mm (1") over 6 days
- Average snow days: 2 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in April, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Flagstaff in May
- Average temperature: 14℃ (57℉)
- Average high temperature: 20℃ (69℉)
- Average low temperature: 7℃ (44℉)
- Average humidity: 33%
- Average sunny days: 24 days
- Average rainfall: 19mm (1") over 5 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in May, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.
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Flagstaff in June
- Average temperature: 20℃ (69℉)
- Average high temperature: 28℃ (82℉)
- Average low temperature: 13℃ (55℉)
- Average humidity: 24%
- Average sunny days: 26 days
- Average rainfall: 6mm (0") over 3 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in June, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Flagstaff in July
- Average temperature: 22℃ (72℉)
- Average high temperature: 28℃ (83℉)
- Average low temperature: 16℃ (61℉)
- Average humidity: 43%
- Average sunny days: 11 days
- Average rainfall: 69mm (3") over 16 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in July, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Flagstaff in August
- Average temperature: 21℃ (70℉)
- Average high temperature: 27℃ (81℉)
- Average low temperature: 15℃ (59℉)
- Average humidity: 46%
- Average sunny days: 12 days
- Average rainfall: 52mm (2") over 14 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in August, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Flagstaff in September
- Average temperature: 18℃ (64℉)
- Average high temperature: 24℃ (75℉)
- Average low temperature: 12℃ (54℉)
- Average humidity: 44%
- Average sunny days: 18 days
- Average rainfall: 25mm (1") over 9 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in September, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
Flagstaff in October
- Average temperature: 11℃ (52℉)
- Average high temperature: 18℃ (64℉)
- Average low temperature: 5℃ (42℉)
- Average humidity: 45%
- Average sunny days: 24 days
- Average rainfall: 18mm (1") over 5 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in October, make sure you pack a warm jacket or coat.
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Flagstaff in November
- Average temperature: 5℃ (41℉)
- Average high temperature: 12℃ (53℉)
- Average low temperature: 0℃ (32℉)
- Average humidity: 51%
- Average sunny days: 25 days
- Average rainfall: 24mm (1") over 2 days
- Average snow days: 2 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in November, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Flagstaff in December
- Average temperature: 0℃ (32℉)
- Average high temperature: 6℃ (43℉)
- Average low temperature: -4℃ (25℉)
- Average humidity: 64%
- Average sunny days: 22 days
- Average rainfall: 28mm (1") over 4 days
- Average snow days: 7 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Flagstaff in December, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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