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Fontana, CA Weather on May 25

May 25th in Fontana, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 55°F. Over 55 years of records, the warmest May 25th was in 1974 (85°F average), while the coldest was 1980 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 25th dates historically. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.

By Weather On This Day|
Avg High
79°F
Avg Low
55°F
Record High
109°F
1974
Record Low
40°F
1980
Fontana, CA on May 25 — Temperature History40°F60°F80°F100°F120°F19801990200020102020HighLow

What to Expect on May 25

Planning for May 25th in Fontana, CA? Great weather for outdoor activities.

May 25 Weather Records for Fontana

  • The all-time record high for May 25th in Fontana, CA is 109°F, set in 1974.
  • The coldest May 25th on record dropped to 40°F in 1980.
  • Temperatures have reached 90°F or higher on May 25th in 5 of the last 55 years.
  • Last year (1971), May 25th was 10°F warmer than the long-term average.

Frequently Asked Questions

What was the warmest May 25 ever in Fontana?

The warmest May 25 in Fontana, CA reached 109°F in 1974. That is 30°F above the long-term average high of 79°F.

What was the coldest May 25 ever in Fontana?

The coldest May 25 in Fontana, CA dropped to 40°F in 1980. That is 15°F below the long-term average low of 55°F.

What is the average temperature on May 25 in Fontana?

On May 25, Fontana averages a high of 79°F and a low of 55°F based on 55 years of NOAA weather observations from FONTANA KAISER.

How many years of weather data are available for May 25 in Fontana?

We have 55 years of weather records for May 25 in Fontana, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.

May 25 Weather History in Fontana

YearHighLowPrecipSnow
202578°F58°F0"--
202471°F54°F0"--
202371°F56°F0"--
202286°F57°F0"--
202192°F64°F0"--
202092°F56°F0"--
201977°F55°F0"--
201872°F55°F0"--
201772°F56°F0"--
201670°F54°F0"--
201573°F53°F0"--
201486°F60°F0"--
201378°F56°F0"--
201271°F53°F0"--
201180°F54°F0"--
201075°F48°F0"--
200977°F58°F0"--
200866°F49°F0"--
200784°F57°F0"--
200688°F60°F0"--
200588°F58°F0"--
200471°F57°F0"--
200371°F56°F0"--
200277°F53°F0"--
200185°F60°F0"--
200065°F58°F0"--
199981°F54°F0"--
199867°F58°F0"--
199781°F59°F0"--
199675°F50°F0"--
199568°F55°F0"--
199468°F56°F0.03"--
199383°F56°F0"--
199280°F62°F0"--
199185°F54°F0"--
199084°F52°F0"--
198982°F52°F0"--
198885°F56°F0"--
198771°F56°F0"--
198699°F55°F0"--
198584°F55°F0"--
198492°F54°F0"--
198386°F57°F0"--
198279°F59°F0"--
198182°F59°F0"--
198070°F40°F0"--
197986°F54°F0"--
197873°F41°F0"--
197768°F50°F0"--
197676°F57°F0"--
197581°F54°F0"--
1974109°F60°F0"--
197375°F53°F0"--
197273°F57°F0"--
197189°F58°F0"--

Based on 55 years of data from NOAA station: FONTANA KAISER

Monthly Climate Averages

Historical temperature and precipitation averages for Fontana, CA, based on 55+ years of weather data.

Warmest MonthAugustAvg High: 94°F / Low: 65°F
Coldest MonthDecemberAvg High: 67°F / Low: 44°F
Jan
67°/ 44°
💧 11.9"
Feb
68°/ 45°
💧 13.1"
Mar
71°/ 48°
💧 9.3"
Apr
75°/ 50°
💧 5.9"
May
79°/ 54°
💧 3.8"
Jun
87°/ 59°
💧 1.4"
Jul
94°/ 64°
💧 2.6"
Aug
94°/ 65°
💧 8.1"
Sep
90°/ 63°
💧 5.3"
Oct
82°/ 56°
💧 5.5"
Nov
74°/ 48°
💧 7.8"
Dec
67°/ 44°
💧 9.9"

Temperatures in Fahrenheit. Precipitation and snowfall in inches.

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