Today
Sun, Jun 21
Overcast
81°55°
- Rain chance
- 0%
- Precip
- 0 in
- Max wind
- 11 mph
San Dimas weather forecast
California, United States · Los_Angeles time · 34.11°, -117.81°
Current conditions · 5:00 AM local
Current conditions in San Dimas
55°F
Mainly clear
Feels like 55°F
- Humidity
- 89%
- Wind
- 1 mph E
- Gusts
- 2 mph
- UV index
- 0
- Visibility
- 8.8 mi
Right now
San Dimas is currently seeing mainly clear, with 13 °C on the thermometer. It feels close to the actual reading at 13 °C. Wind is from the E at 2 km/h. Humidity stands at 89% with sea-level pressure near 1010 hPa.
At a glance
Today
81° / 55°Overcast · extreme UV
Tomorrow
84° / 56°Fog · extreme UV
Upcoming · to Saturday
92° / 66°A steady stretch: highs near 92°, lows around 66°, and no day above a 7% rain chance through Saturday.
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Next 3 days
Expect overcast today, between 13 °C and 27 °C. Tomorrow brings fog with a high of 29 °C and a low of 14 °C. Tuesday brings clear sky with a high of 33 °C and a low of 19 °C.
Tomorrow
Mon, Jun 22
Fog
84°56°
- Rain chance
- 0%
- Precip
- 0 in
- Max wind
- 11 mph
Tuesday
Tue, Jun 23
Clear sky
91°66°
- Rain chance
- 1%
- Precip
- 0 in
- Max wind
- 11 mph
Next 48 hours
- 12 AM59°0%3 mph
- 1 AM58°0%3 mph
- 2 AM57°0%3 mph
- 3 AM56°0%1 mph
- 4 AM55°0%2 mph
- 5 AM55°0%1 mph
- 6 AM57°0%2 mph
- 7 AM58°0%2 mph
- 8 AM60°0%2 mph
- 9 AM61°0%2 mph
- 10 AM66°0%3 mph
- 11 AM70°0%5 mph
- 12 PM74°0%7 mph
- 1 PM78°0%8 mph
- 2 PM80°0%9 mph
- 3 PM81°0%10 mph
- 4 PM81°0%11 mph
- 5 PM79°0%10 mph
- 6 PM76°0%10 mph
- 7 PM73°0%9 mph
- 8 PM68°0%7 mph
- 9 PM65°0%6 mph
- 10 PM63°0%6 mph
- 11 PM61°0%4 mph
- 12 AM60°0%4 mph
- 1 AM59°0%3 mph
- 2 AM58°0%3 mph
- 3 AM57°0%3 mph
- 4 AM57°0%2 mph
- 5 AM56°0%2 mph
- 6 AM56°0%1 mph
- 7 AM57°0%1 mph
- 8 AM59°0%1 mph
- 9 AM64°0%2 mph
- 10 AM69°0%4 mph
- 11 AM74°0%5 mph
- 12 PM77°0%6 mph
- 1 PM81°0%7 mph
- 2 PM83°0%9 mph
- 3 PM84°0%10 mph
- 4 PM83°0%11 mph
- 5 PM81°0%10 mph
- 6 PM78°0%10 mph
- 7 PM74°0%9 mph
- 8 PM70°0%8 mph
- 9 PM68°0%7 mph
- 10 PM67°0%5 mph
- 11 PM68°0%5 mph
In depth
San Dimas starts the period under mainly clear, with the mercury at 13 °C and a feels-like of 13 °C. Today's forecast calls for overcast, topping out near 27 °C before falling back to 13 °C overnight. Winds blow mainly from the W around 17 km/h, with gusts up to 21 km/h. Daytime highs hold fairly steady this week, staying within 27 to 33 °C. No meaningful rain shows up in the seven-day outlook, so dry conditions should dominate. Tomorrow brings fog with a high of 29 °C and a 0% chance of precipitation. The UV index reaches 9 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:40 and sunset at 20:06, giving 14.4 hours of daylight. Current humidity sits at 89% with pressure near 1010 hPa. Looking further out, Thursday shows clear sky with a high around 32 °C, while Saturday ends the week at 28 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Air quality
51
Moderate
US AQI · European AQI 25
Air quality in San Dimas is currently moderate, with a US AQI of 51 (European AQI 25). The dominant pollutant right now is nitrogen dioxide. Unusually sensitive people should consider easing prolonged outdoor exertion. Fine particulate matter (PM2.5) measures 15.5 µg/m³.
Pollutants
- PM2.5
- 15.5 µg/m³
- PM10
- 17.2 µg/m³
- Ozone (O₃)
- 9 µg/m³
- NO₂
- 48.9 µg/m³
- SO₂
- 4 µg/m³
- CO
- 120 µg/m³
- Dust
- 0 µg/m³
Sun & UV
- Sunrise
- 5:40 AM
- Sunset
- 8:06 PM
- Daylight
- 14h 26m
- Max UV
- 8.65 Very high
Wind
- Wind
- 1 mph
- Gusts
- 2 mph
- Direction
- E (81°)
Farming weather
Soil temperatures today read surface 11.5 °C, 6 cm 19.1 °C, 18 cm 22.2 °C, 54 cm 21 °C. Soil moisture sits at 0-1 cm at 0.04 m³/m³, 3-9 cm at 0.08 m³/m³, 27-81 cm at 0.14 m³/m³. For maize, the root-zone reading is below the ideal 0.2-0.35 m³/m³ band. Reference evapotranspiration totals 49 mm against only 0 mm of expected rain — a 49 mm deficit, so irrigation will be needed this week. A suitable spraying window opens around 06:00 on 2026-06-21, with winds at or below 15 km/h and no rain expected. Heat stress is likely for wheat with highs reaching 33 °C (threshold 32 °C). Projected growing degree days over the next week: maize 99, wheat 138.
- Topsoil moisture
- 0.043 m³/m³
- Soil temp
- 51°F
- ET₀ today
- 5.55 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 0 in
- Wind
- 1 mph
- Humidity
- 89%
Advisory summary
No weather alert thresholds are crossed for San Dimas in the current forecast (derived from forecast data, not official warnings). Conditions may still change — check back for updates.
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All data for San Dimas
| Variable | Value |
|---|---|
| City | San Dimas, California, United States |
| Coordinates | 34.10668, -117.80673 |
| Elevation | 291 m |
| Timezone | America/Los_Angeles |
| Population | 34,630 |
| Observed at (local) | 5:00 AM |
| Temperature (2 m) | 55°F |
| Apparent temperature | 55°F |
| Relative humidity (2 m) | 89% |
| Dew point (2 m) | 52°F |
| Precipitation (last hour) | 0 in |
| Rain | 0 in |
| Showers | 0 in |
| Snowfall | 0 in |
| Weather code (WMO) | 1 |
| Cloud cover | 27% |
| Surface pressure | 28.8 inHg |
| Sea-level pressure | 29.8 inHg |
| Wind speed (10 m) | 1 mph |
| Wind gusts (10 m) | 2 mph |
| Wind direction (10 m) | 81° (E) |
| Visibility | 8.8 mi |
| UV index | 0 |
| Day / night | Night |
| Today max / min | 81°F / 55°F |
| Today feels-like max / min | 83°F / 55°F |
| Today precipitation sum | 0 in |
| Today rain sum | 0 in |
| Today snowfall sum | 0 in |
| Today max precip probability | 0% |
| Today max wind / gusts | 11 mph / 13 mph |
| Dominant wind direction | 276° (W) |
| Sunrise / sunset | 5:40 AM / 8:06 PM |
| Daylight duration | 14h 26m |
| Sunshine duration | 10h 29m |
| Max UV index | 8.65 |
| Reference evapotranspiration (ET₀) | 5.55 mm |
| Topsoil moisture (0–1 cm) | 0.043 m³/m³ |
| Surface soil temperature | 51°F |
| US AQI | 51 |
| European AQI | 25 |
| PM2.5 | 15.5 µg/m³ |
| PM10 | 17.2 µg/m³ |
| Ozone (O₃) | 9 µg/m³ |
| Nitrogen dioxide (NO₂) | 48.9 µg/m³ |
| Sulphur dioxide (SO₂) | 4 µg/m³ |
| Carbon monoxide (CO) | 120 µg/m³ |
| Dust | 0 µg/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/us/california/san-dimas" width="320" height="180" frameborder="0" title="San Dimas weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in San Dimas tomorrow?
Rain is unlikely in San Dimas tomorrow; the precipitation chance stays around 0%.
What is the temperature in San Dimas today?
Today San Dimas sees overcast with a high of 27 °C and a low of 13 °C.
How hot will it be in San Dimas tomorrow?
Tomorrow's high in San Dimas is forecast at 29 °C with fog.
Is it windy in San Dimas today?
No, not especially; gusts only reach up to 21 km/h today.
What is the UV index in San Dimas today?
The UV index peaks at 9 today, which is very high.
What time is sunrise and sunset in San Dimas today?
The sun rises at 05:40 and sets at 20:06 local time.
Is the air quality in San Dimas good today?
Air quality is moderate right now, with a US AQI reading of 51.