CannaGLAP
Grow cannabis in Temecula, CA
Growing cannabis in Temecula: the hottest weeks land on flowering
In Temecula, the heat runs late into the year. The Fallbrook 5 NE station, 4.5 miles away, averages about 14 days reaching 90°F in August and about 14 more in September, then about 9 in October and 4 in November.
Those are the weeks a photoperiod plant spends building buds. So the real question is not how to get through July. It is how your flower room handles a 90°F afternoon in October.
Adults 21 and over: yes. Plant limit: 6 living plants per private residence, however many adults live there.
Locked space, not visible from a public place; cities and counties can set reasonable rules for indoor grows (but cannot ban them) and may ban outdoor grows; a landlord may prohibit growing on a rental. Source: Department of Cannabis Control; conditions: Prop 64 text as passed in 2016 (H&S Code 11362.2 and 11362.45). Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
A Temecula flower room in the late heat
Set the lamps by the calendar, not by the season's name. From August through October, afternoons average 83 to 89°F while nights fall to about 58 to 62°F, a gap of 25 to 28 degrees. Run the light period overnight in those months and draw intake air from the house after dark, and the tent breathes the coolest air of the day while the lamp is on.
A tent in a garage off Rancho California Road or a spare room near Old Town still soaks up afternoon heat through the walls. Heat-stressed buds grow loose and airy, and the tops nearest the lamp can bleach. Raise the lamp a little in September and October, cool the room on the hottest days, and watch those top colas closely.
The air dries as harvest nears. In 2024, humidity fell from 66 percent in June to 57 in August and 51 in October, the lowest of the months measured. That keeps bud rot pressure modest, but it speeds the dry: a crop hung in a warm October room can turn crisp in days. Hang it in the coolest dark room in the house and ease the airflow if small stems snap early.
Winter asks almost nothing. The station averages about 0.2 freezing nights a year, average nights stay at 45°F or warmer in every month, and December lows sit near 46°F. A seedling mat and lamps running through the coldest hours cover it. January's 73 percent outdoor humidity only matters in an unheated, damp room, since a heated house dries its own air.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 68 | 67 | 70 | 72 | 75 | 81 | 87 | 89 | 88 | 83 | 74 | 67 |
| Avg low °F | 47 | 46 | 48 | 51 | 53 | 56 | 60 | 62 | 62 | 58 | 52 | 46 |
| Humidity % | 73 | 66 | 60 | 57 | 59 | 51 |
Highs and lows: NOAA 1991 to 2020 normals, Fallbrook 5 Ne station (4.5 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Outdoors in Riverside County
Under California law, a private residence may keep 6 living plants regardless of how many adults live there, inside a locked space that stays out of sight from public places. Cities and counties can set their own rules and may ban outdoor grows, so check Temecula's rules before you plant.
Where it is allowed, transplant from April 15, with seeds sown from March 4 until March 18. Frost will not end this season; heat shapes it. A plant flowering through September and October needs deep morning watering, mulch over the soil and some afternoon shade, and a variety that ripens by mid October misses part of the late heat. October's drier air does lower the odds of mold in the colas.
| Frost | Rare: less than 1 freezing night a year on average |
|---|---|
| Nights stay 50°F or warmer | Apr 10 to Nov 25 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
Wine country talks. Your grow does not have to
Temecula draws a crowd: tasting rooms along the De Portola Wine Trail, the Old Town Temecula Farmers Market on Saturday mornings, the Temecula Valley Balloon and Wine Festival. Visitors and neighbors mix easily, and talk of gardens and harvests comes with it. How many plants you run, and what they yielded, can stay out of the conversation.
Nothing from the grow journal goes up to our servers until Canna GLAP has encrypted it on your phone. If those servers were ever broken into, the intruder would find grow records reduced to code, with no key to read them. The night lighting schedule that got your crop through an October heat spell is knowledge you keep.
What is encrypted: your plants, notes, photos, feed logs and harvests. What is not: account details (such as your email, name and plan), a grow name or town if you type one, your team, and your sensors' names. The full list: what a hacker would get.
Questions growers in Temecula ask
When is it hottest for growing in Temecula?
August and September, with about 14 afternoons each hitting 90°F at the Fallbrook 5 NE station. October still averages about 9, right when outdoor photoperiod plants are flowering.
Does Temecula get frost?
Very rarely: about 0.2 freezing nights a year at the station, and average nights stay at 45°F or warmer all year.
Can I grow cannabis outdoors in Temecula?
State law allows 6 living plants per residence, locked away from public view, and cities and counties can regulate or ban outdoor grows. If local rules at your address allow it, transplant from April 15.
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