Irena, Missouri Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Irena weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:22 AM CDT · Open-Meteo
- TodaySep 21Drizzle later—0.04″64°60°—
- TuesdaySep 22Overcast——60°57°-4°
- WednesdaySep 23Overcast——71°50°+11°
- ThursdaySep 24Light Drizzle13%—70°53°-1°
- FridaySep 25Drizzle42%0.07″69°61°-1°
- SaturdaySep 26Drizzle45%0.03″77°62°+8°
- SundaySep 27Light Drizzle29%—75°62°-2°
Air quality now AQI 21 · Good
AQI 21 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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
- 4:52 PM
- Moonset
- 1:37 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Irena at a glance
- Today vs. normal: Today averages 62°F (high 64°F, low 60°F), about the 62°F normal for Sep 21
- Last frost: April 24 (1991–2020 median, NOAA station 6 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Irena
- Mon64°60°8%
- Tue60°57°4%
- Wed71°50°0%
- Thu70°53°13%
- Fri69°61°42%
- Sat77°62°45%
- Sun75°62°29%
- Mon77°59°34%
- Tue74°57°39%
- Wed74°53°17%
- Thu78°56°10%
- Fri83°59°30%
- Sat70°54°21%
- Sun59°45°14%
- Mon60°41°13%
- Tue59°43°20%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 14) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Irena
Irena sits in Worth County, where the year’s longest day runs 15h 4m of daylight and its shortest just 9h 16m — a swing of +5h 48m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
St. Louis, the state’s largest city, lies about 257 miles to the ESE. The nearest town Irena tracks is Savannah, roughly 48 miles to the SSW.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | radishes |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
The year in Irena tops out in July (~74°F) and dips lowest in January (~22°F), with June wettest at 5.4 inches and January driest at 0.7 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 22° | 0.7″ | 4 |
| February | 27° | 1.3″ | 5 |
| March | 39° | 2.2″ | 6 |
| April | 50° | 3.4″ | 9 |
| May | 60° | 5.3″ | 11 |
| June | 70° | 5.4″ | 9 |
| July | 74° | 4.4″ | 8 |
| August | 73° | 4.0″ | 8 |
| September | 65° | 3.7″ | 7 |
| October | 52° | 2.9″ | 7 |
| November | 38° | 2.1″ | 5 |
| December | 27° | 1.6″ | 5 |
Regional context
Similar climates Grant City, MO, Allendale, MO, Worth, MO
Drawing on NOAA NCEI 1991-2020 normals, Irena's January averages 22°F and July 74°F — 52°F apart — while precipitation totals roughly 37 inches over some 83 days.
Precipitation in Irena runs summer-dominant: June averages 5.4 inches across 9.2 days of warm-season storms, while January drops to 0.7 inches over 4.0 rainy days of drier cool air. That puts Irena in a summer-convective cohort with places like Grant City, MO, Allendale, MO and Worth, MO.
By April 24 the frosts ease in Irena, opening the season for kale, peas, spinach, and parsnips. Warm-soil crops in Irena wait about two weeks past Irena's last frost, once the soil warms. Irena's window closes around October 14 as Irena's overnight lows return below freezing. Sheltered Irena yards can escape a light frost.
Similar climates: Grant City, MO, Allendale, MO, Worth, MO, Denver, MO, Sheridan, MO.
Frequently asked
- When does it freeze in Irena?
- In Irena, expect the last spring frost near April 24; Irena's first autumn frost comes around October 14.
- What is the rainy season in Irena?
- Irena sees its heaviest rain in June (around 5.4 inches), part of roughly 37 inches a year.
- What is the warmest month in Irena?
- Irena peaks in July, when the mean runs near 74°F.
- What is the coldest month in Irena?
- January is Irena's coldest month, averaging about 22°F.
- When can I start a vegetable garden in Irena?
- In Irena, sow peas and hardy greens around April 24; Irena's tomatoes and peppers wait two weeks more.
- How many rainy days does Irena get?
- Irena records around 83 days of measurable precipitation annually.
- What hardiness zone is Irena?
- Because Irena bottoms near 22°F in January, that winter low sets Irena's USDA zone — verify by ZIP.
- What is the 10-day forecast for Irena?
- Irena'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 Irena?
- See this week's day-by-day rain chances for Irena in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Irena?
- Current conditions for Irena and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Irena forecast updated?
- The Irena forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Irena?
- Today's sunrise and sunset times for Irena 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 Irena?
- The next few days in Irena's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Irena sits at 40.5°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Irena
- 64456