Arizona · Deserts & Dry Basins · hardiness zone 9b
Now
31°C · Overcast
Today
36° / 24°
Rain, 7 days
17 mm
Season
Fall · frost in ~93 d
Slugs work all day, not just at night, and blight moves in wet warm air.
Writing your field guide — reading the forecast, the moon and the map…
Overhead · Tucson, Arizona
The two clocks nothing on the ground can argue with: the length of the day, and the phase of the moon.
The sun
12h 23m of light
Sunrise
06:07
Solar noon
12:19
Sunset
18:30
A month from now the day will be 0h 59m shorter. Enough light for steady growth.
Right now · Tucson, Arizona
Nothing here is a guess. Each of these is read from this week's forecast and this location's climate record, and each one is pushing the season one way or the other.
32.4 °C soil · 17.3 mm
Warm and damp: the fastest decay of the year. Compost cooks, leaf mould breaks down, worms work the surface — and mushrooms fruit two to seven days after a soaking rain.
Fungi and bacteria turning last season into next season's soil. The same warm, wet window that runs a compost heap also fruits the mushrooms.
17.3 mm / 7 days
17.3 mm across 3 days — short of the ~25 mm a week most beds want. Top up the thirstiest rows.
Sets the pace for everything: germination, fungal fruiting, slug nights, and how a river runs for the next three days.
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The moon
Waxing Crescent
11% lit · waxing · day 3 of 29.5
Planting by the moon: New to first quarter: sow leafy crops and anything harvested for its leaves — lettuce, spinach, brassicas, herbs.
Fishing: good — feeding peaks in the days either side of new and full, and around moonrise and moonset.
Turn of the season
Fall equinox
Sep 22 · 7 days away
About 93 days to the average first frost (Dec 16).
Next moons
299 frost-free days
Typically Feb 20 to Dec 16 here. Coldest night in the next week: 23.1 °C.
The hard edge of the growing season. Ice inside a leaf ruptures its cells — one night ends a tomato and sweetens a parsnip.
32.4 °C
Hot soil: germination drops off above 30 °C and roots slow. Mulch, shade the row, and sow late in the day.
Seeds read soil temperature, not the calendar. Six centimetres down is where the decision gets made.
12h 23m
Losing about 2 minutes of daylight a day.
The one thing weather can't change. Plants count photoperiod to decide when to bolt, bulb, flower and go dormant.
Waxing Crescent · 11%
Waxing, 3 days old. Full moon in 11 days. Fishing outlook: good.
It moves water — in the sea, in a lake's edge, and, by long tradition, in the sap of a plant. Fish feed hardest on the days around new and full.
Found near Tucson · September
332 species have been recorded within about 40 km of here in September, from verified public observations. These are the ones we have written up, ordered by how often they turn up.

54 records within 40 km this month

46 records within 40 km this month
Dangerous look-alike23 records within 40 km this month

14 records within 40 km this month
Recorded near you this month. We have no identification guidance for these, so treat them as a list of things to go and learn — from a regional key or someone who knows them — not as a list of things to pick.
Fungi
Your woods
The commonest trees recorded nearby, most often seen first. Most of the good mushrooms are tied to a particular tree, so this is the first thing to know about a wood.
Know these first
4 species on our hazard list have been recorded near here this month, 1 of which can kill a healthy adult. Learn these before you learn anything you intend to eat.
Lepiota (the whole genus)
Chlorophyllum molybdites
Next
Coming into season in the next month or two near Tucson, Arizona. Seasons shift a week or two with the weather, so treat these as things to keep an eye on rather than dates.
Prickly Pear Leaf Spot
Phyllosticta concava
13 records nearby
Plants

saguaro
Carnegiea gigantea
933 records nearby

fishhook barrel cactus
Ferocactus wislizeni
638 records nearby

Creosote Bush
Larrea tridentata
354 records nearby

ocotillo
Fouquieria splendens
258 records nearby

Chain-fruit Cholla
Cylindropuntia fulgida
218 records nearby

Graham's nipple cactus
Cochemiea grahamii
201 records nearby
Photographs and records from iNaturalist, used under their open licences and credited to their photographers.
Amanita muscaria
Hypholoma fasciculare
These are recorded within about 40 km of here in this month, from verified public observations. It is not a complete list of what is dangerous — nothing is — and a species missing from it may still be in your woods. Never eat anything identified from a photograph and a description alone.