St. George, Utah Weather
Thunder finally silent. Day 93 of summer. Read this microseason across nine climate regions →
St. George weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:00 AM MDT · Open-Meteo
- TodaySep 21Overcast15%—94°67°—
- TuesdaySep 22Overcast10%—92°71°-2°
- WednesdaySep 23Overcast——90°71°-2°
- ThursdaySep 24Overcast——93°74°+3°
- FridaySep 25Overcast——92°72°-1°
- SaturdaySep 26Overcast——95°75°+3°
- SundaySep 27Overcast——96°77°+1°
Air quality now AQI 46 · Good
AQI 46 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 37 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 12.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 12.
- Present
- AQI 37
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 12
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 5:00 PM
- Moonset
- 2:09 AM
- In sign
- ♑︎ Capricorn
Thunder finally silent
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
St. George at a glance
- Today vs. normal: Today averages 81°F (high 94°F, low 67°F), 7°F above the 74°F normal for Sep 21
- Last frost: March 14 (1991–2020 median, NOAA station 6 km away)
- Microseason: Sep 21–25
- Planting calendar: September — harvest beans, summer squash, winter squash
15-Day Forecast — St. George
- Mon94°67°15%
- Tue92°71°10%
- Wed90°71°1%
- Thu93°74°7%
- Fri92°72°9%
- Sat95°75°4%
- Sun96°77°6%
- Mon94°77°10%
- Tue97°76°9%
- Wed86°74°15%
- Thu74°70°11%
- Fri91°70°10%
- Sat94°75°11%
- Sun83°65°16%
- Mon82°59°17%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near St. George
Interactive wind and temperature map centered on St. George — it loads in your browser. Open the full weather map.
Right now in the garden
Late season
As of September 21, the first frost (around November 10) is about 7 weeks away. Frost-tender plants keep producing until then. This city's planting calendar for September: harvest beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — St. George
SPC includes St. George in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in St. George
St. George sits in Washington County, where the year’s longest day runs 14h 43m of daylight and its shortest just 9h 37m — a swing of +5h 6m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Salt Lake City, the state’s largest city, lies about 271 miles to the NNE. The nearest town St. George tracks is Enterprise, roughly 35 miles to the NNW.
Air quality in St. George
Air quality in St. George’s county has held roughly steady since 2020; its cleanest year on record was 2023 (median AQI 43). See the full air-quality history for St. George.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes | radishes |
| April | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| May | tomatoes, squash | lettuce, peas, spinach |
| June | squash | beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, summer squash, winter squash |
| August | beans, squash, fall brassicas, carrots | summer squash, winter squash |
| September | — | beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| November | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
A year in weather
St. George's warmest month is July (~87°F mean) and its coldest is December (~40°F). Rainfall peaks in February (1.4 inches) and bottoms out in June (0.2 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 41° | 1.2″ | 5 |
| February | 46° | 1.4″ | 6 |
| March | 53° | 1.0″ | 5 |
| April | 60° | 0.7″ | 3 |
| May | 71° | 0.3″ | 3 |
| June | 80° | 0.2″ | 1 |
| July | 87° | 0.5″ | 3 |
| August | 85° | 1.1″ | 3 |
| September | 77° | 0.7″ | 2 |
| October | 63° | 0.8″ | 3 |
| November | 49° | 0.7″ | 3 |
| December | 40° | 0.9″ | 5 |
Regional context
Similar climates Santa Clara, UT, Washington, UT, Ivins, UT
In St. George, NOAA NCEI 1991-2020 normals put January near 41°F and July near 87°F — a 46°F seasonal arc — with about 9.3 inches of precipitation over 42 rainy or snowy days.
St. George's moisture rides winter storm tracks: February brings 1.4 inches over 5.7 wet days, while June sees only 0.2 inches across 1.2 days in the dry warm season. That groups St. George with places like Santa Clara, UT, Washington, UT and Ivins, UT on the same cool-season storm track.
St. George reaches its last hard frost near March 14; that is the cue for peas, lettuce, spinach, and radishes. St. George's heat-lovers — tomatoes, peppers, squash — hold off until St. George's frost risk clears, 10-14 days on. The season ends by November 10 in St. George, once hard frosts set back in. That date is a median: St. George freezes sooner in half of years.
Similar climates: Santa Clara, UT, Washington, UT, Ivins, UT, Hurricane, UT, Dammeron Valley, UT.
Frequently asked
- When does it freeze in St. George?
- In St. George, expect the last spring frost near March 14; St. George's first autumn frost comes around November 10.
- What is the rainy season in St. George?
- Rainfall in St. George peaks in February near 1.4 inches, out of about 9 inches annually.
- What is the warmest month in St. George?
- St. George peaks in July, when the mean runs near 87°F.
- What is the coldest month in St. George?
- December is St. George's coldest month, averaging about 40°F.
- When can I start a vegetable garden in St. George?
- In St. George, sow peas and hardy greens around March 14; St. George's tomatoes and peppers wait two weeks more.
- How many rainy days does St. George get?
- Expect roughly 42 wet days a year in St. George.
- What hardiness zone is St. George?
- Because St. George bottoms near 40°F in December, that winter low sets St. George's USDA zone — verify by ZIP.
- What is the 10-day forecast for St. George?
- St. George's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in St. George?
- See this week's day-by-day rain chances for St. George in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in St. George?
- Current conditions for St. George and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the St. George forecast updated?
- The St. George forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in St. George?
- Today's sunrise and sunset times for St. George are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for St. George?
- The next few days in St. George's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
St. George sits at 37.1°N; its climate zone is hot desert (Köppen approximation).
ZIP codes in St. George
- 84770
- 84790
- 84791