Flagstaff, United States experiences average highs of 18°C (64°F) and lows of 6°C (43°F) throughout the year. Rainfall is moderate, averaging about 8 rainy days per month. Sunshine is abundant, averaging about 11 hours per day. Average highs have warmed by 1.0°C (1.8°F) across the available records.
Flagstaff, United States Weather & Climate 2026
Monthly climate averages for Flagstaff, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Dec 
Wetter season: Jan–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.8/10
Best: June, July, August, September, October
UV Index
6
High
Temperature 18°C / 6°C
Feels Like 15°C / 3°C
Rainy Days 8
Rainfall 50 mm
Sunshine 11 h
Humidity 49%
Wind Speed 16 km/h
Dew Point 1°C
Snow Days 5 days
Frost Days 13 days
Hottest Month
29°C
July
Avg Low17°C
Rain15days
Coldest Month
-4°C
January
Avg High6°C
Rain8days
Driest Month
4days
June
Avg High28°C
Avg Low14°C
Windiest Month
21 km/h
April (Gusts 59)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 05:13
Daylight 14.5h
Sunset 19:44
Live conditions—
Flagstaff on the map · live conditions
Flagstaff, United States
- Continent
- Americas
- Country
- United States
- City
- Flagstaff
- Population
- 70.3K
- Elevation
- 2,104 m
- Coordinates
- 35.20°, -111.65°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 4°C
Rain 7 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 16°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 8°C
Rain 6 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 7°C
Avg Low -2°C
Rain 6 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 6°C / -4°C . Feb: 8°C / -2°C . Mar: 11°C / 0°C . Apr: 17°C / 4°C . May: 21°C / 8°C . Jun: 28°C / 14°C . Jul: 29°C / 17°C . Aug: 27°C / 16°C . Sep: 25°C / 13°C . Oct: 19°C / 8°C . Nov: 13°C / 3°C . Dec: 8°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 49 mm. Feb: 47 mm. Mar: 66 mm. Apr: 22 mm. May: 32 mm. Jun: 20 mm. Jul: 121 mm. Aug: 93 mm. Sep: 52 mm. Oct: 37 mm. Nov: 31 mm. Dec: 34 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 62%. Feb: 58%. Mar: 57%. Apr: 41%. May: 37%. Jun: 28%. Jul: 46%. Aug: 53%. Sep: 49%. Oct: 47%. Nov: 50%. Dec: 56%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 14 km/h . Feb: 17 km/h . Mar: 19 km/h . Apr: 21 km/h . May: 20 km/h . Jun: 18 km/h . Jul: 14 km/h . Aug: 13 km/h . Sep: 15 km/h . Oct: 16 km/h . Nov: 15 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 10h. Mar: 10h. Apr: 12h. May: 13h. Jun: 13h. Jul: 12h. Aug: 12h. Sep: 11h. Oct: 10h. Nov: 9h. Dec: 8h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 5. Mar: UV 6. Apr: UV 8. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 4. Dec: UV 4.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 9 days. Feb: 6 days. Mar: 10 days. Apr: 3 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 4 days. Dec: 6 days.
Climate Trends
Average highs have warmed by 1.0°C (1.8°F) across the available records. Average rainfall is trending drier by about 17 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 30°C | Jul · 29°C |
| Coldest month | Jan 2025 · -3°C | Jan · -4°C |
| Wettest month | Mar 2025 · 73 mm | Jul · 121 mm |
| Windiest month | Mar 2025 · 20 km/h | Apr · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Excellent November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 6°C / -4°C | 2°C / -8°C | 8days (49 mm) Wet | 8.3h Good | 62% Muggy | 3.7 Moderate | Poor | View Details |
| February | 8°C / -2°C | 4°C / -7°C | 5days (47 mm) Good | 9.5h Good | 58% Moderate | 5 Moderate | Poor | View Details |
| March | 11°C / 0°C | 7°C / -4°C | 10days (66 mm) Wet | 10.4h Excellent | 57% Moderate | 6.3 High | Poor | View Details |
| April | 17°C / 4°C | 13°C / 0°C | 5days (22 mm) Good | 12h Excellent | 41% Moderate | 7.5 Very High | Fair | View Details |
| May | 21°C / 8°C | 18°C / 5°C | 6days (32 mm) Good | 12.8h Excellent | 37% Comfortable | 8 Very High | Good | View Details |
| June best | 28°C / 14°C | 26°C / 12°C | 4days (20 mm) Good | 13.1h Excellent | 28% Comfortable | 8.4 Very High | Excellent | View Details |
| July best | 29°C / 17°C | 29°C / 16°C | 15days (121 mm) Wet | 12.4h Excellent | 46% Moderate | 8.2 Very High | Excellent | View Details |
| August best | 27°C / 16°C | 27°C / 15°C | 15days (93 mm) Wet | 12.1h Excellent | 53% Moderate | 7.7 Very High | Excellent | View Details |
| September best | 25°C / 13°C | 23°C / 11°C | 8days (52 mm) Wet | 11.1h Excellent | 49% Moderate | 7 High | Excellent | View Details |
| October best | 19°C / 8°C | 16°C / 5°C | 5days (37 mm) Good | 10.1h Excellent | 47% Moderate | 5.7 High | Excellent | View Details |
| November | 13°C / 3°C | 9°C / -1°C | 4days (31 mm) Good | 8.9h Good | 50% Moderate | 4.1 Moderate | Fair | View Details |
| December | 8°C / -1°C | 4°C / -5°C | 5days (34 mm) Good | 8.1h Good | 56% Moderate | 3.5 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Flagstaff are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Flagstaff, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Flagstaff is July, with average daytime highs of 29°C (85°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Flagstaff is January, with average overnight lows of -4°C (26°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Flagstaff is July, averaging 121mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Flagstaff runs through July, August, March, with the heaviest rainfall in July. Based on 10-year averages for Flagstaff.
Flagstaff receives approximately 129 sunshine hours per year. The sunniest month is June with around 13 hours. Based on climate data for Flagstaff.
The least favorable months to visit Flagstaff are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in Flagstaff is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Flagstaff is 49%, classified as dry. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Flagstaff receives snow. Months with snowfall average 5 snow days and 15 cm (6 in) of accumulation, with about 13 frost days during winter.
Average wind speeds in Flagstaff are 16 km/h (10 mph). The windiest month is April with peak winds reaching 21 km/h (13 mph) (gusts up to 59 km/h / 37 mph).
Flagstaff averages 12 clear-sky days per month with overall cloud cover around 36%. The clearest skies occur in October.
The annual average dew point in Flagstaff is 1°C (34°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Flagstaff has a Hot-Summer Mediterranean climate, classified as Csa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Flagstaff ranges from 3°C (37°F) to 15°C (59°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Flagstaff. It earns a climate score of 9.4/10 with Excellent.
For June in Flagstaff, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Sandals. With average highs of 28°C (83°F) and 4 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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